Resin composition, method for forming pattern, method for forming cured coating, interlayer insulating film, surface protective film, and electronic component

文档序号：1020564 发布日期：2020-10-27 浏览：14次中文

阅读说明：本技术 树脂组成物、图案形成方法、硬化被膜形成方法、层间绝缘膜、表面保护膜及电子零件 (Resin composition, method for forming pattern, method for forming cured coating, interlayer insulating film, surface protective film, and electronic component ) 是由浦野宏之竹村胜也饭尾匡史本田和也于 2020-04-14 设计创作，主要内容包括：本发明涉及树脂组成物、图案形成方法、硬化被膜形成方法、层间绝缘膜、表面保护膜及电子零件。本发明的课题目的为提供一种正型感光性树脂组成物,能形成微细的图案且可获得高分辨率,且即使在低温硬化时,机械特性仍良好。该课题的解决方法为一种正型感光性树脂组成物,其特征为含有：(A-1)碱可溶性树脂,至少包含选自于聚酰亚胺结构、聚苯并噁唑结构、聚酰胺酰亚胺结构、它们的前驱体结构中的1种以上的结构；(A-2)树脂,至少包含选自于不具碱可溶性基团而在分子末端具有至少具有1个以上的氮原子的杂环骨架的聚酰亚胺结构、聚苯并噁唑结构、聚酰胺酰亚胺结构、它们的前驱体结构中的1种以上的结构；(B)特定感光剂；及(D)溶剂。(The invention relates to a resin composition, a pattern forming method, a hardened film forming method, an interlayer insulating film, a surface protection film and an electronic component. The object of the present invention is to provide a positive photosensitive resin composition which can form a fine pattern, can obtain a high resolution, and has good mechanical properties even when cured at a low temperature. The solution of the problem is a positive photosensitive resin composition, which is characterized by comprising: (a-1) an alkali-soluble resin containing at least 1 or more structure selected from a polyimide structure, a polybenzoxazole structure, a polyamideimide structure, and a precursor structure thereof; (A-2) a resin containing at least 1 or more structures selected from the group consisting of a polyimide structure, a polybenzoxazole structure, a polyamideimide structure, and precursor structures thereof, wherein the polyimide structure contains no alkali-soluble group and has a heterocyclic skeleton having at least 1 or more nitrogen atoms at the molecular end; (B) a specific photosensitizer; and (D) a solvent.)

1. A positive photosensitive resin composition characterized by comprising:

(A-1) an alkali-soluble resin containing at least 1 or more structure selected from the group consisting of a polyimide structure, a polybenzoxazole structure, a polyamideimide structure, and a precursor structure thereof,

(A-2) a resin containing at least 1 or more structures selected from the group consisting of a polyimide structure, a polybenzoxazole structure, a polyamideimide structure, and a precursor structure thereof, wherein the polyimide structure contains no alkali-soluble group and has a heterocyclic skeleton having at least 1 or more nitrogen atoms at the molecular end,

(B) a photosensitizer which generates an acid by light and has an increased dissolution rate in an aqueous alkali solution, which is a compound having a quinonediazide structure, and

(D) a solvent.

2. The positive photosensitive resin composition according to claim 1, wherein (a-2) comprises a polyimide structure represented by the following general formula (1);

wherein W is a 1-valent organic group having a heterocyclic skeleton containing at least 1 or more nitrogen atoms, and X₁Is a 4-valent organic radical, X₂Is a 2-valent organic group, and l represents an integer of 1 to 1000.

3. The positive photosensitive resin composition according to claim 1 or 2, wherein the positive photosensitive resin composition contains 5 parts by mass or more and 50 parts by mass or less of (a-2) per 100 parts by mass of (a-1).

4. The positive photosensitive resin composition according to claim 1 or 2, wherein (a-1) comprises a structure represented by the following general formula (2) and/or (3);

in the formula, X₃Is a 4-valent organic group, s represents 0 or 1, Z is a 2-valent bonding group, and when s is 0, 2 aromatic rings in the formula are directly bonded without spacing bonding groups;

in the formula, X₄Is a 2-valent organic group, and s and Z are the same as described above.

5. The positive photosensitive resin composition according to claim 4, wherein Z in the general formulae (2) and (3) is a 2-valent group represented by the following general formula (4) or (5);

wherein the dotted line represents a bond.

6. The positive photosensitive resin composition according to claim 1 or 2, wherein (a-1) further comprises a structural unit represented by the following general formula (6) and/or (8);

in the formula, X₅Is a 4-valent organic radical, R₁Is a group represented by the following general formula (7), s represents 0 or 1, Z is a 2-valent bonding group, and when s is 0, 2 aromatic rings in the formula are directly bonded without intervening bonding groups;

wherein the dotted line represents a bond, Y₁A (k +1) -valent organic group, Rf is a linear, branched or cyclic alkyl group having 1 to 20 carbon atoms, wherein some or all of the hydrogen atoms are replaced by fluorine atoms, or an aromatic group which may be replaced by an alkyl group, k represents 1,2 or 3, and n represents 0 or 1;

in the formula, X₆Is a 4-valent organic radical, X₇Is a group represented by the following general formula (9);

in the formula, R₂～R₅Independently a linear or branched alkylene group having 2 to 10 carbon atoms, m₁Is an integer of 1 to 40, m₂、m₃Each independently is an integer of 0 to 40.

7. The positive photosensitive resin composition according to claim 6, wherein R in the general formula (6)₁Is any one organic group selected from the group represented by the following general formulae (10), (11), (12), and (13);

wherein the dotted line represents a bond; rf is the same as above, Ra and Rb are a hydrogen atom or an alkyl group having 1 to 3 carbon atoms, Y₂And Y₃Is a linear or branched alkylene group having 1 to 6 carbon atoms, n1 represents an integer of 0 to 6, n2 represents an integer of 1 to 6, n3 represents an integer of 0 to 6, n4 represents an integer of 1 to 6, n5 represents an integer of 0 to 6, n6 represents 0 or 1, and n7 represents an integer of 0 to 6.

8. The positive photosensitive resin composition according to claim 1 or 2, further comprising (C) a crosslinking agent selected from 1 or 2 or more of an amino condensate modified with formaldehyde or formaldehyde-alcohol, a phenol compound having 2 or more hydroxymethyl groups or alkoxyhydroxymethyl groups on average in 1 molecule, a compound in which a hydrogen atom of a hydroxyl group of a polyhydric phenol is substituted with a glycidyl group, a compound in which a hydrogen atom of a hydroxyl group of a polyhydric phenol is substituted with a substituent represented by the following formula (C-1), and a compound containing 2 or more nitrogen atoms having a glycidyl group represented by the following formula (C-2);

wherein the dotted line represents a bond, Rc represents a linear, branched or cyclic alkyl group having 1 to 6 carbon atoms, and v represents 1 or 2.

9. The positive photosensitive resin composition according to claim 1 or 2, further comprising (E) a compound that generates an acid by heat.

10. A pattern forming method, characterized by comprising the steps of:

(1) applying the positive photosensitive resin composition according to any one of claims 1 to 9 onto a substrate to form a photosensitive material film,

(2) then, after heating treatment, exposing the photosensitive material film with high-energy rays or electron beams with the wavelength of 190-500 nm at intervals of a photomask, and

(3) the development is performed using a developer of an aqueous alkali solution.

11. A method for forming a hardened coating film, comprising the steps of:

the patterned coating film obtained by the pattern forming method according to claim 10 is heated at a temperature of 100 to 300 ℃ and post-cured.

12. An interlayer insulating film characterized in that:

the cured film formed by curing the positive photosensitive resin composition according to any one of claims 1 to 9.

13. A surface protective film characterized by:

the cured film formed by curing the positive photosensitive resin composition according to any one of claims 1 to 9.

14. An electronic component characterized in that:

having the interlayer insulating film according to claim 12 or the surface protective film according to claim 13.

Technical Field

The invention relates to a positive photosensitive resin composition, a pattern forming method using the positive photosensitive resin composition and capable of developing by an alkaline solution, a cured coating forming method, an interlayer insulating film, a surface protection film and an electronic component.

Background

With the miniaturization and high performance of various electronic devices such as personal computers, digital cameras, and mobile phones, further miniaturization, thinning, and high density of semiconductor devices are rapidly increasing. Meanwhile, the interlayer insulating film and the surface protective film of the semiconductor device are required to have more excellent electrical characteristics, heat resistance, mechanical characteristics, and the like.

In high-density mounting technologies such as three-dimensional lamination, a photosensitive insulating material capable of forming a pattern on a substrate has been attracting attention as a protective film and an insulating layer using a polyimide film, and has been developed to date.

Conventionally, as photosensitive polyimide materials, materials using polyamic acid, which is a precursor of polyimide, have been proposed, for example, those obtained by introducing a photosensitive group into a carboxyl group of polyamic acid via an ester bond (patent documents 1 and 2). However, these claims require an imidization treatment at a high temperature exceeding 300 ℃ after the formation of a patterned film in order to obtain a desired polyimide film, and have a problem that the base substrate is limited to withstand the high temperature, and copper of wiring is oxidized.

As an improvement, there has been proposed a photosensitive polyimide using an imidized solvent-soluble resin for lowering the post-curing temperature (patent documents 3 and 4). Patent document 3 proposes a negative photosensitive composition containing a ring-closed polyimide, but there is no description about mechanical strength, although there is a description about pattern formability and adhesiveness.

Patent document 4 proposes a positive photosensitive resin composition using an alkali-soluble ring-closed polyimide, a photoacid generator, and a thermal crosslinking agent having a methylol group, but there is still room for improvement in the value of elongation at break at low temperature curing.

Patent document 5 proposes a positive photosensitive resin composition using an alkali-soluble polyimide having a diamine residue containing a triazine or pyridazine skeleton in its molecular skeleton, an alkali-soluble polyimide having a glass transition temperature different from that of the above polyimide, and a photoacid generator, which is a material excellent in adhesion to copper wiring, but has room for improvement in mechanical properties, particularly in elongation at break.

Patent document 6 proposes a polyimide resin composition in which a polyimide having a carboxyl group in the molecular skeleton and a polyimide having a heterocyclic skeleton containing a nitrogen atom at the molecular end are combined, but does not describe a photosensitive resin composition. When the composition described in patent document 6 is used as an insulating material for the surface protective film and the interlayer insulating film, carboxyl groups contained in the resin remain in the cured film, which causes copper migration, and thus it is necessary to completely block the carboxyl groups. Thus, for example, an epoxy-based crosslinking agent or the like can be used to block the carboxyl group, but the composition is difficult to apply to the art because the reactivity of the carboxyl group with the epoxy-based crosslinking agent is high and there is a problem in storage stability.

Patent document 7 proposes a positive photosensitive resin composition using an alkali-soluble polyamideimide and a photoacid generator, which is a material having excellent solvent solubility and resolution performance, but still has room for improvement in mechanical properties, particularly in elongation at break.

As described above, in the future, with the increase in density and integration of wafers, the miniaturization of patterns in the re-wiring technology of insulating protective films is also increasing, and therefore, there is a strong demand for a photosensitive resin composition that can exhibit high resolution without impairing the excellent characteristics of the patterns and protective films obtained by heating, such as mechanical properties and adhesion.

Disclosure of Invention

Problems to be solved by the invention

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a positive photosensitive resin composition which is soluble in an aqueous alkali solution, can form a fine pattern, can obtain a high resolution, and has good mechanical properties even when cured at a low temperature.

Means for solving the problems

In order to solve the above problems, the present invention provides a positive photosensitive resin composition comprising:

(B) a photosensitizer which generates an acid by light and has an increased dissolution rate in an aqueous alkali solution, which is a compound having a quinonediazide structure, and

(D) a solvent.

Such a positive photosensitive resin composition is soluble in an aqueous alkali solution, can form a fine pattern, can achieve high resolution, and has good mechanical properties even when cured at low temperatures.

In the positive photosensitive resin composition of the present invention, the (a-2) may contain a polyimide structure represented by the following general formula (1).

[ solution 1]

Wherein W is a 1-valent organic group having a heterocyclic skeleton containing at least 1 or more nitrogen atoms, and X₁Is a 4-valent organic radical, X₂Is a 2-valent organic group, and l represents an integer of 1 to 1000.

In the case of such a positive photosensitive resin composition, the cured film of the photosensitive composition is improved in elongation, and therefore, the cured film is more excellent in mechanical properties even when cured at low temperatures.

The positive photosensitive resin composition of the present invention preferably contains the (A-2) in an amount of 5 to 50 parts by mass based on 100 parts by mass of the (A-1).

In the case of such a positive photosensitive resin composition, the intermolecular interaction between the resins (A-1) and (A-2) can be appropriately adjusted, and the effect of improving the stretching of the cured film of the photosensitive composition can be obtained without causing problems such as residue during the photolithographic patterning.

In the positive photosensitive resin composition of the present invention, the (A-1) preferably has a structure represented by the following general formula (2) and/or (3).

[ solution 2]

In the formula, X₃Is a 4-valent organic group, s represents 0 or 1, Z is a 2-valent bonding group, and when s is 0, 2 aromatic rings in the formula are directly bonded without intervening bonding groups.

[ solution 3]

In the formula, X₄Is a 2-valent organic group, and s and Z are the same as described above.

Such a positive photosensitive resin composition is more preferable in terms of solubility in an aqueous alkali solution and also in terms of better mechanical properties of a cured product.

In this case, Z in the general formulae (2) and (3) is preferably a 2-valent group represented by the following general formula (4) or (5).

[ solution 4]

Wherein the dotted line represents a bond.

When Z is such a group, the solubility in a developer of an aqueous alkali solution is improved, and thus it is preferable.

In the positive photosensitive resin composition of the present invention, the (A-1) preferably further contains a structural unit represented by the following general formula (6) and/or (8).

[ solution 5]

In the formula, X₅Is a 4-valent organic radical, R₁Is a group represented by the following general formula (7), s represents 0 or 1, Z is a 2-valent bonding group, and when s is 0, 2 aromatic rings in the formula are directly bonded without intervening bonding groups.

[ solution 6]

Wherein the dotted line represents a bond, Y₁Is a (k +1) -valent organic group, Rf is a linear, branched or cyclic alkyl group having 1 to 20 carbon atoms, wherein some or all of the hydrogen atoms are replaced by fluorine atoms, or an aromatic group which may be replaced by an alkyl group, k represents 1,2 or 3, and n represents 0 or 1.

[ solution 7]

In the formula, X₆Is a 4-valent organic radical, X₇Is a group represented by the following general formula (9).

[ solution 8]

In the formula, R₂～R₅Independently a linear or branched alkylene group having 2 to 10 carbon atoms, m₁Is an integer of 1 to 40, m₂、m₃Each independently is an integer of 0 to 40.

By containing such a structural unit, the solubility in a general-purpose organic solvent is improved, a solvent of the composition can be used without limitation, and a cured film having flexibility, high elongation, and low warpage can be obtained.

In this case, R in the above general formula (6)₁Preferably, it is any organic group selected from the group represented by the following general formulae (10), (11), (12) and (13).

[ solution 9]

[ solution 10]

[ solution 11]

[ solution 12]

Wherein the dotted line represents a bond. Rf is the same as above, Ra and Rb are a hydrogen atom or an alkyl group having 1 to 3 carbon atoms, Y₂And Y₃Is a linear or branched alkylene group having 1 to 6 carbon atoms, n1 represents an integer of 0 to 6, n2 represents an integer of 1 to 6, n3 represents an integer of 0 to 6, n4 represents an integer of 1 to 6, n5 represents an integer of 0 to 6, n6 represents 0 or 1, and n7 represents an integer of 0 to 6.

Consideration is given to R₁Easiness of obtaining the compound of the raw material to be introduced, R₁Such groups are preferred.

The positive photosensitive resin composition of the present invention preferably further comprises (C) 1 or 2 or more crosslinking agents selected from the group consisting of an amino condensate modified with formaldehyde or formaldehyde-alcohol, a phenol compound having an average of 2 or more methylol groups or alkoxymethylol groups in 1 molecule, a compound in which a hydrogen atom of a hydroxyl group of a polyhydric phenol is substituted with a glycidyl group, a compound in which a hydrogen atom of a hydroxyl group of a polyhydric phenol is substituted with a substituent represented by the following formula (C-1), and a compound containing 2 or more nitrogen atoms having a glycidyl group represented by the following formula (C-2).

[ solution 13]

Wherein the dotted line represents a bond, Rc represents a linear, branched or cyclic alkyl group having 1 to 6 carbon atoms, and v represents 1 or 2.

The component (C) causes a crosslinking reaction at the time of post-curing after the pattern formation of the positive photosensitive resin composition of the present invention, and can further improve the strength of the cured product, and can form a more preferable cured film.

The positive photosensitive resin composition of the present invention preferably further contains (E) a compound which generates an acid by heat.

By further advancing the crosslinking and curing reaction in the component (E), the mechanical strength, chemical resistance, adhesion and the like of the obtained pattern or coating film can be further improved.

Further, the present invention provides a pattern forming method, characterized by comprising the steps of:

(1) coating the positive photosensitive resin composition on a substrate to form a photosensitive material film,

(2) then, after heating treatment, exposing the photosensitive material film with high-energy rays or electron beams with the wavelength of 190-500 nm at intervals of a photomask, and

(3) the development is performed using a developer of an aqueous alkali solution.

In such a pattern forming method, the positive photosensitive resin composition can be dissolved in an aqueous alkali solution, and a fine pattern can be formed and a high resolution can be obtained.

Further, the present invention provides a method for forming a cured coating, comprising the steps of:

the coating film with the pattern formed by the pattern forming method is heated at a temperature of 100-300 ℃ and then hardened.

By such a method of forming a cured coating, a cured coating (pattern) having good mechanical properties can be formed even when cured at low temperatures.

Further, the present invention provides an interlayer insulating film or a surface protective film, which is characterized by comprising a cured film obtained by curing the positive photosensitive resin composition.

The cured coating film obtained by curing the positive photosensitive resin composition of the present invention is excellent in adhesion to a substrate, heat resistance, electrical characteristics, mechanical strength, and chemical resistance against an alkaline stripping solution, etc., and is also excellent in reliability of a semiconductor device using the cured coating film as a protective coating film, and therefore, is suitable as a protective coating film (an interlayer insulating film or a surface protective film) for an electric/electronic component, a semiconductor device, etc.

Further, the present invention provides an electronic component characterized by comprising the above-mentioned interlayer insulating film or surface protective film.

Such a protective coating (interlayer insulating film or surface protective film) is effective for an insulating film for a semiconductor element including a rewiring application, an insulating film for a multilayer printed board, and the like, because of its heat resistance, chemical resistance, and insulating properties, and can be used to produce an electronic component having excellent reliability.

ADVANTAGEOUS EFFECTS OF INVENTION

As described above, according to the present invention, a positive photosensitive resin composition which is soluble in an aqueous alkali solution, can form a fine pattern, can obtain a high resolution, and has good mechanical properties even when cured at a low temperature can be provided.

Detailed Description

As described above, a photosensitive resin composition which is soluble in an aqueous alkali solution, can form a fine pattern, can obtain a high resolution, and has good mechanical properties even when cured at a low temperature is required.

The present inventors have intensively studied to achieve the above object and found that a positive photosensitive resin composition containing (A-1) an alkali-soluble resin having a specific structure, (A-2) a resin having no alkali-soluble group and having a specific structure, (B) a specific photosensitizer, and (D) a solvent can be used to obtain a fine pattern having a good pattern shape.

Further, it has been found that a protective film obtained by using the positive photosensitive resin composition and performing patterning and heating is excellent in mechanical properties, particularly in elongation at break. That is, the present inventors have found that a cured film having a pattern formed using the positive photosensitive resin composition is excellent as a protective film or an insulating protective film for an electric/electronic component, and have completed the present invention. In the present specification, the electric and electronic components are also collectively referred to as "electronic components".

That is, the present invention is a positive photosensitive resin composition characterized by containing:

(B) a photosensitizer which generates an acid by light and has an increased dissolution rate in an aqueous alkali solution, which is a compound having a quinonediazide structure, and

(D) a solvent.

The present invention will be described in detail below, but the present invention is not limited thereto.

[ Positive photosensitive resin composition ]

The positive photosensitive resin composition of the present invention will be explained.

The positive photosensitive resin composition of the present invention comprises:

(B) a photosensitizer which generates an acid by light and has an increased dissolution rate in an aqueous alkali solution, which is a compound having a quinonediazide structure, and

(D) a solvent.

The positive photosensitive resin composition can be subjected to alkali development. The positive photosensitive resin composition may further contain, in addition to the component (A-1), the component (A-2), the component (B), and the component (D), if necessary, (C) a crosslinking agent, (E) a compound that generates an acid by heat (thermal acid generator), and the like. These components will be described in detail below.

[ (A-1) alkali-soluble resin ]

The alkali-soluble resin (a-1) of the present invention is an alkali-soluble resin containing at least 1 or more structures selected from a polyimide structure, a polybenzoxazole structure, a polyamideimide structure, and a precursor structure thereof. The resin (A-1) is not particularly limited as long as it is an alkali-soluble resin having the above structure, and preferably has a structure represented by the following general formula (2) and/or (3).

[ solution 14]

[ solution 15]

In the formula, X₄Is a 2-valent organic group, and s and Z are the same as described above.

X in the above general formula (2)₃The organic group is a 4-valent organic group, and is not limited as long as it is a 4-valent organic group. The 4-valent organic group is preferably a cyclic aliphatic group or aromatic group having 4 to 40 carbon atoms, and more preferably a 4-valent organic group represented by the following formula (14). And, X₃The structure of (A) may be 1 or a combination of 2 or more.

[ solution 16]

Wherein the dotted line represents a bond.

When s in the general formula (2) represents 0 or 1, and s is 0, 2 aromatic rings in the general formula (2) are directly bonded without a 2-valent bonding group Z.

On the other hand, when s is 1,2 aromatic rings in the general formula (2) are bonded with a 2-valent bonding group Z interposed therebetween. Z is not limited as long as it is a 2-valent group. The 2-valent organic group is preferably a cyclic aliphatic group or aromatic group having 4 to 40 carbon atoms, and more preferably a 2-valent bonding group represented by the following formula (15). The structure of Z may be 1 or a combination of 2 or more.

[ solution 17]

In the formula, q₁、q₂And q₃Represents an integer of 1 to 6, q₄And q is₅Represents an integer of 1 to 10. The dotted line represents a bond.

The 2-valent bonding group Z is particularly preferably a 2-valent group represented by the following general formula (4) or (5).

[ solution 18]

Wherein the dotted line represents a bond.

The structural unit represented by the above general formula (2), when Z in the above general formula (2) is a group represented by the above general formula (4), is preferably a structural unit represented by the following general formula (2-1); when Z in the above general formula (2) is a group represented by the above formula (5), it is preferably a structural unit represented by the following general formula (2-2).

[ solution 19]

[ solution 20]

In the formula, X₃As before.

In the case where Z, which is a 2-valent linking group, is hexafluoroisopropylidene represented by the above formula (4) and is located at the para-position to the phenolic hydroxyl group as in the above general formula (2-1), since hexafluoroisopropylidene is an electron-attracting group, the degree of acidity of the phenolic hydroxyl group becomes high, and the solubility in a developer of an alkaline aqueous solution is improved, which is preferable.

Similarly, as in the above general formula (2-2), when Z, which is a 2-valent bonding group, is a sulfone group represented by the above formula (5) and is located at the para-position of the phenolic hydroxyl group, the sulfone group is also an electron-attracting group, and therefore the phenolic hydroxyl group is more acidic and the solubility in an aqueous alkaline developer is improved, which is preferable.

X in the above general formula (3)₄The organic group is a 2-valent organic group, and is not limited as long as it is a 2-valent organic group. Preferably a C4-C40 aliphatic long chain structure or a cyclic aliphatic group or an aromatic group having a valence of 2. It is still more preferable that the organic group has a valence of 2 represented by the following formula (16). And, X₄The structure of (A) may be 1 or a combination of 2 or more.

[ solution 21]

In the formula, R₆、R₇Each independently represents a hydrogen atom, a fluorine atom, or an alkyl group having 1 to 6 carbon atoms, q₆Is an integer of 1 to 30, and the dotted line represents a bond.

X in the above general formula (3)₄The positive photosensitive resin composition of the present invention preferably has a cured film having a high mechanical strength, particularly a high elongation, when the cured film has a 2-valent organic group having an aliphatic long-chain structure.

In the general formula (3), s and Z are preferably represented by the general formula (4) or (5) from the viewpoint of solubility in a developer of an aqueous alkali solution, as described above. In this case, as in the case of the above formulas (2-1) and (2-2), the degree of acidity of the phenolic hydroxyl group is high, and the solubility in a developer of an alkaline aqueous solution is improved, which is preferable.

The alkali-soluble resin (a-1) of the present invention may further contain a structural unit represented by the following general formula (17) (hereinafter also referred to as structural unit (17)) in addition to the structural units represented by the above general formulae (2) and (3).

[ solution 22]

In the formula, X₄As before. X₈Is a 2-valent organic group.

X in the above general formula (17)₈The organic group is a 2-valent organic group, and is not limited as long as it is a 2-valent organic group, preferably a 2-valent organic group having 6 to 40 carbon atoms, and more preferably a cyclic organic group containing 1 to 4 substituted aromatic rings or aliphatic rings, or an aliphatic group or siloxane group having no cyclic structure. Further, ideal X₈The structure represented by the following formula (18) or (19) can be mentioned. And, X₈The structure of (A) may be 1 or a combination of 2 or more.

[ solution 23]

In the formula, the dotted line represents a bond to an amino group.

[ solution 24]

Wherein the dotted line represents a bond with an amino group, R₈Each independently represents a methyl group, an ethyl group, a propyl group, an n-butyl group or a trifluoromethyl group, q₇Represents a positive number of 2 to 20.

The alkali-soluble resin (a-1) of the present invention may further contain a structural unit represented by the following general formula (20) (hereinafter also referred to as a structural unit (20)) in addition to the structural units represented by the above general formulae (2) and (3).

[ solution 25]

In the formula, X₃And X₈As before.

The alkali-soluble resin (a-1) of the present invention preferably contains a structural unit represented by the following general formula (6) (hereinafter also referred to as structural unit (6)) in addition to the structural units represented by the above general formulae (2) and (3).

[ solution 26]

In the formula, X₅Is as follows from the aforementioned X₃Identical or different organic radicals having a valence of 4, R₁S and Z are the same as those described above, and are a group represented by the following general formula (7).

[ solution 27]

The alkali-soluble resin (A-1) containing the structural unit (6) improves the solubility in general-purpose organic solvents such as propylene glycol monomethyl ether acetate, and the solvent of the composition can be used without limitation.

Y in the above general formula (7)₁Preferably a C1-C6 linear or branched 2-valent organic group (e.g., alkylene group).

Further, R in the above general formula (6)₁Preferably, it is an organic group selected from any one of the groups represented by the following formulae (10), (11), (12) and (13). The organic group represented by the following formula (11') is more preferable for the following formula (11).

[ solution 28]

[ solution 29]

[ solution 30]

[ solution 31]

Among the organic groups represented by the above general formula (10), the following are specifically mentioned as organic groups which can be preferably used. However, the present invention is not limited thereto.

[ solution 32]

[ solution 33]

Wherein the dotted line represents a bond.

Among the organic groups represented by the above general formula (11), the following are specifically mentioned as organic groups which can be preferably used. However, the present invention is not limited thereto.

[ chemical 34]

[ solution 35]

[ solution 36]

[ solution 37]

Wherein the dotted line represents a bond. n2 represents an integer of 1 to 6, preferably an integer of 1 to 3, more preferably 1 or 2, most preferably 1.

Among the organic groups represented by the above general formula (12), the following are specifically mentioned as organic groups which can be preferably used. However, the present invention is not limited thereto.

[ solution 38]

[ solution 39]

[ solution 40]

[ solution 41]

[ solution 42]

[ solution 43]

Wherein the dotted line represents a bond. n4 represents an integer of 1 to 6, preferably an integer of 1 to 3, more preferably 1 or 2, most preferably 1.

Among the organic groups represented by the above general formula (13), the following are specifically mentioned as organic groups which can be preferably used. However, the present invention is not limited thereto.

[ solution 44]

Wherein the dotted line represents a bond.

Here, after patterning using the positive photosensitive resin composition of the present invention, upon heating for post-curing, the structural unit of the polyimide precursor represented by the general formula (6) undergoes imidization ring-closure reaction, but the R introduced at this time₁The film is detached and removed from the system, and a decrease in the film thickness of the formed film is observed. Therefore, in order to minimize the film loss during post-curing, R is more desirable₁The molecular weight is small.

The alkali-soluble resin (a-1) of the present invention preferably contains a structural unit represented by the following general formula (8) (hereinafter also referred to as structural unit (8)) in addition to the structural units represented by the above general formulae (2) and (3).

[ solution 45]

In the formula, X₆Is as follows from the aforementioned X₃Identical or different 4-valent organic radicals, X₇Is of the following general formula(9) The group shown.

[ solution 46]

In the formula, R₂～R₅Independently a linear or branched alkylene group having 2 to 10 carbon atoms, m₁Is an integer of 1 to 40, m₂、m₃Each independently is an integer of 0 to 40.

X in the formula (8)₆Can be for X₃Examples of the 4-valent organic group include the 4-valent organic group represented by the above formula (14). And, X₇Among the organic groups (groups represented by the above general formula (9)), those which are preferably used are specifically listed below. However, the present invention is not limited thereto.

[ solution 47]

By including such a structural unit (8), the alkali-soluble resin (a-1) can provide a cured film having flexibility, high elongation, and low warpage.

[ Process for producing alkali-soluble resin (A-1) ]

The alkali-soluble resin (A-1) of the present invention has a structure represented by the following general formula (2) and/or (3).

[ solution 48]

In the formula, X₃、X₄S and Z are the same as described above.

The alkali-soluble resin containing a structural unit represented by the above general formula (2) can be obtained by reacting a tetracarboxylic dianhydride represented by the following general formula (21) with a diamine represented by the following general formula (22). First, a tetracarboxylic dianhydride represented by the following general formula (21) is reacted with a diamine represented by the following general formula (22) to synthesize an amic acid, and then, an imide ring is formed by dehydration by heating, whereby a polymer containing the structural unit (2) can be obtained.

The production of the aforementioned structural unit (2) can be carried out in the following manner: dissolving diamine in a high-boiling-point and high-polarity solvent such as gamma-butyrolactone and N-methyl-2-pyrrolidone, reacting the resulting mixture at 0 to 80 ℃ and preferably 10 to 50 ℃ to produce amic acid, adding a nonpolar solvent such as xylene, heating the resulting mixture to 100 to 200 ℃ and preferably 130 to 180 ℃, and then conducting an imidization reaction while removing water from the reaction system.

[ solution 49]

In the formula, X₃As before.

[ solution 50]

In the formula, s and Z are the same as described above.

Preferable examples of the tetracarboxylic dianhydride represented by the above general formula (21) include: aromatic acid dianhydride, alicyclic acid dianhydride, aliphatic acid dianhydride, and the like. Examples of the aromatic acid dianhydride include: pyromellitic dianhydride, 3,3 ', 4, 4' -biphenyltetracarboxylic dianhydride, 2,3,3 ', 4' -biphenyltetracarboxylic dianhydride, 2,3,2 ', 3' -biphenyltetracarboxylic dianhydride, 3,3 ', 4, 4' -terphenyltetracarboxylic dianhydride, 3,3 ', 4, 4' -oxydiphthalic dianhydride, 2,3,3 ', 4' -oxydiphthalic dianhydride, 2,3,2 ', 3' -oxydiphthalic dianhydride, diphenylsulfone-3, 3 ', 4, 4' -tetracarboxylic dianhydride, benzophenone-3, 3 ', 4, 4' -tetracarboxylic dianhydride, 2-bis (3, 4-dicarboxyphenyl) propane dianhydride, 2-bis (2, 3-dicarboxyphenyl) propane dianhydride, 1, 1-bis (3, 4-dicarboxyphenyl) ethane dianhydride, 1-bis (2, 3-dicarboxyphenyl) ethane dianhydride, bis (3, 4-dicarboxyphenyl) methane dianhydride, bis (2, 3-dicarboxyphenyl) methane dianhydride, 1, 4-bis (3, 4-dicarboxyphenoxy) benzene dianhydride, p-phenylene bis (trimellitic acid monoester anhydride), bis (1, 3-dioxo-1, 3-dihydroisobenzofuran-5-carboxylic acid) -1, 4-phenylene ester, 2-bis (4- (4-aminophenoxy) phenyl) propane, 1,2,5, 6-naphthalenetetracarboxylic dianhydride, 2,3,6, 7-naphthalenetetracarboxylic dianhydride, 9-bis (3, 4-dicarboxyphenyl) fluorene dianhydride, 2,3,5, 6-pyridinetetracarboxylic dianhydride, 3,4,9, 10-perylenetetracarboxylic dianhydride, 2-bis (3, 4-dicarboxyphenyl) hexafluoropropane dianhydride, 2-bis (4- (3, 4-dicarboxybenzoyloxy) phenyl) hexafluoropropane dianhydride, 1, 6-difluoropyromellitic dianhydride, 1-trifluoromethylpyromellitic dianhydride, 1, 6-bis (trifluoromethyl) pyromellitic dianhydride, 2 '-bis (trifluoromethyl) -4, 4' -bis (3, 4-dicarboxyphenoxy) biphenyl dianhydride, 2 '-bis [ (dicarboxyphenoxy) phenyl ] propane dianhydride, 2' -bis [ (dicarboxyphenoxy) phenyl ] hexafluoropropane dianhydride, or an aromatic ring-alkylated alkyl thereof, An acid dianhydride compound substituted with an alkoxy group, a halogen atom, or the like, but not limited thereto.

Examples of the alicyclic acid dianhydride include: 1,2,3, 4-cyclobutanetetracarboxylic dianhydride, 1,2,3, 4-cyclopentanetetracarboxylic dianhydride, 1,2,4, 5-cyclohexanetetracarboxylic dianhydride, 1,2,4, 5-cyclopentanetetracarboxylic dianhydride, 1,2,3, 4-tetramethyl-1, 2,3, 4-cyclobutanetetracarboxylic dianhydride, 1, 2-dimethyl-1, 2,3, 4-cyclobutanetetracarboxylic dianhydride, 1, 3-dimethyl-1, 2,3, 4-cyclobutanetetracarboxylic dianhydride, 1,2,3, 4-cycloheptanetetracarboxylic dianhydride, 2,3,4, 5-tetrahydrofuranetetracarboxylic dianhydride, 3, 4-dicarboxy-1-cyclohexylsuccinic dianhydride, 2,3, 5-tricarboxycyclopentylacetic dianhydride, 3, 4-dicarboxy-1, 2,3, 4-tetrahydro-1-naphthalene succinic dianhydride, bicyclo [3,3,0]Octane-2, 4,6, 8-tetracarboxylic dianhydride, bicyclo [4,3, 0]]Nonane-2, 4,7, 9-tetracarboxylic dianhydride, bicyclo [4,4, 0]]Decane-2, 4,7, 9-tetracarboxylic dianhydride, bicyclo [4,4, 0]]Decane-2, 4,8, 10-tetracarboxylic dianhydride, tricyclo [6,3,0^2,6]Undecane-3, 5,9, 11-tetracarboxylic dianhydride, bicyclo [2, 2] tetracarboxylic dianhydride]Octane-2, 3,5, 6-tetracarboxylic dianhydride, bicyclo [2, 2]]Octyl-7-ene-2, 3,5, 6-tetracarboxylic dianhydride, bicyclo [2,2, 1]]Heptane tetracarboxylic dianhydride, bicyclo [2,2, 1]]Heptane-5-carboxymethyl-2, 3, 6-tricarboxylic dianhydride, 7-oxabicyclo [2,2,1]Heptane-2, 4,6, 8-tetracarboxylic dianhydride, octahydronaphthalene-1, 2,6, 7-tetracarboxylic dianhydride, decatetrahydroanthracene-1, 2,8, 9-tetracarboxylic dianhydride, 3 ', 4, 4' -dicyclohexyltetracarboxylic dianhydride, 3 ', 4, 4' -oxydicyclohexane tetracarboxylic dianhydride, 5- (2, 5-dioxotetrahydro-3-furan) -3-methyl-3-cycloHexene-1, 2-dicarboxylic anhydride, RIKACID (registered trademark) BT-100 (trade name, manufactured by shin-hei chemical & chemical), derivatives thereof, and acid dianhydride compounds in which an alicyclic ring thereof is substituted with an alkyl group, an alkoxy group, a halogen atom, or the like, but are not limited thereto.

Examples of the aliphatic acid dianhydride include: 1,2,3, 4-butane tetracarboxylic dianhydride, 1,2,3, 4-pentane tetracarboxylic dianhydride, derivatives thereof, and the like, but are not limited thereto.

These aromatic acid dianhydrides, alicyclic acid dianhydrides, or aliphatic acid dianhydrides may be used alone or in combination of 2 or more.

On the other hand, when s in the general formula (22) represents 0 or 1, and s is 0, 2 aromatic rings in the general formula (22) are directly bonded without a 2-valent bonding group Z.

When s in the general formula (22) is 1, Z in the general formula (22) is not limited as long as it is a 2-valent group. As mentioned above, the 2-valent organic group which is a cyclic aliphatic group or aromatic group having 4 to 40 carbon atoms is preferably a 2-valent bonding group represented by the above formula (15). The structure of Z may be 1 or a combination of 2 or more.

Further, preferable examples of the diamine represented by the above general formula (22) are compounds represented by the following general formulae (23) and (24).

[ solution 51]

[ solution 52]

The alkali-soluble resin obtained by reacting the diamine represented by the general formula (23) with the tetracarboxylic dianhydride represented by the general formula (21) is a polymer containing a structural unit represented by the general formula (2-1) which is a desired structural unit.

On the other hand, the alkali-soluble resin obtained by reacting the diamine represented by the general formula (24) with the tetracarboxylic dianhydride represented by the general formula (21) is a polymer containing a structural unit represented by the general formula (2-2) which is a desired structural unit.

On the other hand, the alkali-soluble resin containing the structural unit (3) can be obtained by reacting a dicarboxylic acid compound represented by the following general formula (25) with a diamine represented by the above general formula (22).

[ Hua 53]

In the formula, X₄As before.

The polymer containing the structural unit (3) can be obtained, for example, by reacting a dicarboxylic acid compound represented by the above general formula (25) with a diamine represented by the above general formula (22) in the presence of a dehydration condensation agent. That is, the dicarboxylic acid compound represented by the above general formula (25) is used in a state of being dissolved in a reaction solvent for reaction, and a known dehydration condensation agent (for example, dicyclohexylcarbodiimide, 1-ethoxycarbonyl-2-ethoxy-1, 2-dihydroquinoline, 1-carbonyldioxy-bis (1,2, 3-benzotriazole), N' -disuccinimidyl carbonate, or the like) is added and mixed to the reaction solution under ice cooling, the dicarboxylic acid compound represented by the above general formula (25) is converted into an acid anhydride, and then a diamine represented by the above general formula (22) is further added dropwise thereto and dissolved or dispersed in a solvent to be subjected to polycondensation, whereby a polymer containing the structural unit (3) can be obtained.

Another method for obtaining a polymer containing the structural unit (3) by reacting the dicarboxylic acid compound represented by the above general formula (25) with the diamine represented by the above general formula (22) (diamine compound) is a method of converting the dicarboxylic acid compound represented by the above general formula (25) into an acid chloride using a chlorinating agent such as thionyl chloride or oxalic acid dichloride, and then reacting the acid chloride with the diamine represented by the above general formula (22).

In the reaction of converting the above dicarboxylic acid compound into an acid chloride using a chlorinating agent, a basic compound may also be used. The basic compound can be used, for example: pyridine, 4-dimethylaminopyridine, triethylamine and the like.

Then, the acid chloride of the obtained dicarboxylic acid compound is reacted with a diamine represented by the above general formula (22) in the presence of a basic catalyst, whereby a polymer containing the structural unit (3) can be obtained. In this case, examples of the basic catalyst include: pyridine, dimethylaminopyridine, 1, 8-diazabicyclo [5.4.0] undec-7-ene, 1, 5-diazabicyclo [4.3.0] nona-5-ene, and the like.

In the method for producing the alkali-soluble resin of the present invention, the solvent used in the method for producing an acid chloride is preferably a polymer obtained by dissolving the above dicarboxylic acid compound and its acid chloride in a good manner, and further dissolving the polymer obtained by the polycondensation reaction between the dicarboxylic acid compound and the diamine in a good manner. Specifically, there may be mentioned: n-methyl-2-pyrrolidone, N-dimethylacetamide, N-dimethylformamide, dimethyl sulfoxide, tetramethylurea, hexamethylphosphoric triamide, γ -butyrolactone, and the like. In addition to the polar solvent, ketones, esters, lactones, ethers, halogenated hydrocarbons, and the like can be used. Examples thereof include: acetone, diethyl ketone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, methyl acetate, ethyl acetate, butyl acetate, diethyl oxalate, diethyl malonate, diethyl ether, ethylene glycol dimethyl ether, diethylene glycol dimethyl ether, tetrahydrofuran, dichloromethane, 1, 2-dichloroethane, 1, 4-dichlorobutane, trichloroethane, chlorobenzene, o-dichlorobenzene, hexane, heptane, octane, benzene, toluene, xylene, and the like. These organic solvents may be used alone or 2 or more of them may be used in combination.

X in the dicarboxylic acid compound represented by the above general formula (25)₄The same preferable examples as those mentioned above can be cited.

Further, examples of the dicarboxylic acid compound represented by the above general formula (25) include: malonic acid, dimethylmalonic acid, ethylmalonic acid, isopropylmalonic acid, di-n-butylmalonic acid, succinic acid, tetrafluorosuccinic acid, methylsuccinic acid, 2-dimethylsuccinic acid, 2, 3-dimethylsuccinic acid, dimethylmethylsuccinic acid, glutaric acid, hexafluoroglutaric acid, 2-methylglutaric acid, 3-methylglutaric acid, 2-dimethylglutaric acid, 3-dimethylglutaric acid, 3-ethyl-3-methylglutaric acid, adipic acid, octafluoroadipic acid, 3-methyladipic acid, pimelic acid, 2,6, 6-tetramethylpimelic acid, suberic acid, dodecafluorosuberic acid, azelaic acid, sebacic acid, hexadecafluorsebacic acid, 1, 9-nonanedioic acid, dodecanedioic acid, tridecanedioic acid, tetradecanedioic acid, pentadecanedioic acid, Hexadecanedioic acid, heptadecanedioic acid, octadecanedioic acid, nonadecanedioic acid, eicosanedioic acid, heneicosanedioic acid, tricosanedioic acid, tetracosanedioic acid, pentacosanedioic acid, hexacosanedioic acid, heptacosanedioic acid, octacosanedioic acid, nonacosanedioic acid, tridecanedioic acid, hentriacontanedioic acid, dotriacontaric acid, 3-oxoglutaric acid (digylcolic acid), and the like.

Further, examples of the dicarboxylic acid compound having an aromatic ring include: phthalic acid, isophthalic acid, terephthalic acid, 4 '-diphenyletherdicarboxylic acid, 3, 3' -diphenyletherdicarboxylic acid, 4 '-diphenyldicarboxylic acid, 3, 3' -diphenyldicarboxylic acid, 4 '-benzophenonedicarboxylic acid, 3, 3' -benzophenonedicarboxylic acid, 4 '-hexafluoroisopropylidenebenzoic acid, 4' -dicarboxyldiphenylamide, 1, 4-phenylenediacetic acid, bis (4-carboxyphenyl) sulfide, 2-bis (4-carboxyphenyl) -1,1,1,3,3, 3-hexafluoropropane, bis (4-carboxyphenyl) tetraphenyldisiloxane, Bis (4-carboxyphenyl) tetramethyldisiloxane, bis (4-carboxyphenyl) sulfone, bis (4-carboxyphenyl) methane, 5-tert-butylisophthalic acid, 5-bromoisophthalic acid, 5-fluoroisophthalic acid, 5-chloroisophthalic acid, 2-bis (p-carboxyphenyl) propane, 2, 6-naphthalenedicarboxylic acid, and the like, but are not limited thereto. These may be used alone or in combination.

Preferable examples of s and Z in the general formula (22) include those similar to the above examples.

On the other hand, as described above, the alkali-soluble resin (a-1) of the present invention may further include the following structural units (17) and (20).

[ solution 54]

In the formula, X₄And X₈As before.

[ solution 55]

In the formula, X₃And X₈As before.

The alkali-soluble resin containing the structural unit (17) can be obtained by simultaneously reacting a dicarboxylic acid compound represented by the general formula (25) with a diamine represented by the general formula (22) and a diamine represented by the general formula (26). That is, the polymer can be obtained by carrying out the reaction in the presence of a dehydration condensation agent in the same manner as in the above-mentioned method for producing a polymer containing the structural unit (3), or by carrying out the reaction of converting the polymer into an acid chloride using a chlorinating agent and then reacting the acid chloride with the diamine.

[ solution 56]

H₂N-X₈-NH₂(26)

In the formula, X₈As before.

The diamine represented by the above general formula (26) includes: aromatic diamines, alicyclic diamines, aliphatic diamines, and the like. Preferred aromatic diamines are, for example: 3,4 '-diaminodiphenyl ether, 4' -diaminodiphenyl ether, 3,4 '-diaminodiphenyl methane, 4' -diaminodiphenyl methane, 3,3 '-diaminodiphenyl sulfone, 3, 4' -diaminodiphenyl sulfone, 4 '-diaminodiphenyl sulfone, 3, 4' -diaminodiphenyl sulfide, 4 '-diaminodiphenyl sulfide, 1, 4-bis (4-aminophenoxy) benzene, benzidine, 2' -bis (trifluoromethyl) benzidine, 3,3 '-bis (trifluoromethyl) benzidine, 2' -dimethylbenzidine, 3,3 '-dimethylbenzidine, 2', 3,3 '-tetramethylbenzidine, 2' -dichlorobenzidine, 3,4 '-diaminodiphenyl methane, 3, 3' -diaminodiphenyl sulfone, 3,4 '-diaminodiphenyl sulfide, 1, 4' -bis (4-aminophenoxy) benzene, benzidine, 2,3,3 ' -dichlorobenzidine, 2 ', 3,3 ' -tetrachlorobenzidine, m-phenylenediamine, p-phenylenediamine, 1, 5-naphthalenediamine, 2, 6-naphthalenediamine, bis (4-aminophenoxyphenyl) sulfone, bis (3-aminophenoxyphenyl) sulfone, bis [4- (3-aminophenoxy) phenyl ] sulfone, bis (4-aminophenoxy) biphenyl, bis [4- (4-aminophenoxy) phenyl ] ether, 1, 4-bis (4-aminophenoxy) benzene, 9-bis (4-aminophenyl) fluorene, 2 ' -bis [3- (3-aminobenzamide) -4-hydroxyphenyl ] hexafluoropropane, 4 ' -aminobenzoic acid-4-aminophenyl ester, 4, 4' -diaminobenzanilide, or diamine compounds in which the aromatic ring thereof is substituted with an alkyl group, an alkoxy group, a halogen atom, or the like, but is not limited thereto.

Examples of the alicyclic diamines include: cyclobutanediamine, isophoronediamine, bicyclo [2,2, 1]]Heptane bis-methylamine, tricyclo [3,3, 1]^3,7]Decane-1, 3-diamine, 1, 2-cyclohexyldiamine, 1, 3-cyclohexyldiamine, 1, 4-diaminocyclohexane, trans-1, 4-diaminocyclohexane, cis-1, 4-diaminocyclohexane, 4 ' -diaminodicyclohexylmethane, 3 ' -dimethyl-4, 4 ' -diaminodicyclohexylmethane, 3 ' -diethyl-4, 4 ' -diaminodicyclohexylmethane, 3 ', 5,5 ' -tetramethyl-4, 4 ' -diaminodicyclohexylmethane, 3 ', 5,5 ' -tetraethyl-4, 4 ' -diaminodicyclohexylmethane, 3, 5-diethyl-3 ', 5 ' -dimethyl-4, 4 ' -diaminodicyclohexylmethane, 4 ' -diaminodicyclohexylether, 3 ' -dimethyl-4, 4 ' -diaminodicyclohexylether, 3 ' -diethyl-4, 4 ' -diaminodicyclohexylether, 3 ', 5,5 ' -tetramethyl-4, 4 ' -diaminodicyclohexylether, 3 ', 5,5 ' -tetraethyl-4, 4 ' -diaminodicyclohexylether, 3, 5-diethyl-3 ', 5 ' -dimethyl-4, 4 ' -diaminodicyclohexylether, 2-bis (4-aminocyclohexyl) propane, 2-bis (3-methyl-4-aminocyclohexyl) propane, 2-bis (3-ethyl-4-aminocyclohexyl) propane, 2, 2-bis (3, 5-dimethyl-4-aminocyclohexyl) propane, 2-bis (3, 5-diethyl-4-aminocyclohexyl) propane, 2- (3, 5-diethyl-3 ', 5 ' -dimethyl-4, 4 ' -diaminodicyclohexyl) propane, or a diamine compound in which an alicyclic ring thereof is substituted with an alkyl group, an alkoxy group, a halogen atom, or the like, but is not limited thereto.

Examples of the aliphatic diamine include: alkylenediamines such as ethylenediamine, 1, 3-diaminopropane, 1, 4-diaminobutane, 1, 5-diaminopentane, 1, 6-diaminohexane, 1, 7-diaminoheptane, 1, 8-diaminooctane, 1, 9-diaminononane and 1, 10-diaminodecane; ethylene glycol diamines such as bis (aminomethyl) ether, bis (2-aminoethyl) ether and bis (3-aminopropyl) ether; and siloxane diamines such as 1, 3-bis (3-aminopropyl) tetramethyldisiloxane, 1, 3-bis (4-aminobutyl) tetramethyldisiloxane, and α, ω -bis (3-aminopropyl) polydimethylsiloxane, but are not limited thereto.

These aromatic diamines, alicyclic diamines, or aliphatic diamines may be used alone or in combination of 2 or more.

Also, siloxane diamines can be preferably used.

On the other hand, the alkali-soluble resin containing the structural unit (20) can be obtained by performing the same reaction sequence as that of the structural unit (2). That is, the alkali-soluble resin containing the structural unit (20) can be obtained by reacting a mixture of the diamine represented by the general formula (22) and the diamine represented by the general formula (26) with the tetracarboxylic dianhydride represented by the general formula (21) to synthesize an amic acid, and then forming an imide ring through a thermal dehydration step.

On the other hand, as described above, the alkali-soluble resin (A-1) of the present invention may further contain the following structural unit (6).

The polymer containing a structural unit represented by the following general formula (6) can be obtained by reacting a tetracarboxylic acid diester compound represented by the following general formula (27) with a diamine represented by the above general formula (22). That is, the polymer can be obtained by carrying out the reaction in the presence of a dehydration condensation agent in the same manner as in the above-mentioned method for producing a polymer containing the structural unit (3), or by carrying out the reaction of converting the polymer into an acid chloride using a chlorinating agent and then reacting the acid chloride with the diamine.

[ solution 57]

In the formula, X₅、R₁S, and Z are the same as described above.

[ solution 58]

In the formula, R₁And X₅As before.

The method for producing the tetracarboxylic acid diester compound represented by the general formula (27) includes introducing R by reacting a tetracarboxylic dianhydride represented by the general formula (28) with a compound having a hydroxyl group at the end represented by the general formula (29) in the presence of a basic catalyst such as pyridine₁The method of (1). Here, the tetracarboxylic dianhydride represented by the following general formula (28) is X in the above general formula (6)₅(for example, the type (14) representation of the 4 organic groups), the following general formula (29) representation of the terminal hydroxyl compounds are the general formula (7) to introduce the group.

[ chemical 59]

In the formula, X₅As before.

[ solution 60]

In the formula, Y₁Rf, k, and n are the same as described above.

The tetracarboxylic dianhydride represented by the general formula (28) includes the tetracarboxylic dianhydride represented by the general formula (21) shown above as an example of preferable examples.

The reaction of the tetracarboxylic dianhydride represented by the general formula (28) with the compound having a hydroxyl group at the end represented by the general formula (29) can be carried out by stirring, dissolving, and mixing the tetracarboxylic dianhydride represented by the general formula (28) and the compound having a hydroxyl group at the end represented by the general formula (29) in a reaction solvent in the presence of a basic catalyst such as pyridine at a reaction temperature of 20 to 50 ℃ for 4 to 10 hours to carry out a half-esterification reaction of acid dianhydride, and obtain a solution in which a desired tetracarboxylic diester compound represented by the general formula (27) is dissolved in the reaction solvent

The resulting tetracarboxylic acid diester compound may be isolated, or the resulting solution may be used as it is for the reaction with diamine in the next step described below.

The reaction solvent is preferably a solvent capable of dissolving the tetracarboxylic acid diester compound and a polymer having a structural unit of a polyimide precursor obtained by a subsequent polycondensation reaction of the tetracarboxylic acid diester compound and a diamine, and examples thereof include: n-methyl-2-pyrrolidone, N-dimethylacetamide, N-dimethylformamide, dimethyl sulfoxide, tetramethylurea, γ -butyrolactone, and the like. Ketones, esters, lactones, ethers, halogenated hydrocarbons, and the like can also be used, and specific examples thereof include: acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, methyl acetate, ethyl acetate, butyl acetate, diethyl oxalate, ethylene glycol dimethyl ether, diethylene glycol dimethyl ether, tetrahydrofuran, dichloromethane, 1, 2-dichloroethane, 1, 4-dichlorobutane, chlorobenzene, o-dichlorobenzene, hexane, heptane, benzene, toluene, xylene, and the like. These may be used alone or in combination of 2 or more.

On the other hand, preferable examples of the general formula (22) are the same as those described above.

On the other hand, as described above, the alkali-soluble resin (A-1) of the present invention may further contain the following structural unit (8).

[ solution 61]

In the formula, X₆And X₇As before.

[ solution 62]

In the formula, R₂～R₅、m₁、m₂、m₃As before.

The alkali-soluble resin comprising the structural unit (8) can be obtained by performing the same reaction sequence as that of the structural unit (2). That is, the alkali-soluble resin containing the structural unit (8) can be obtained by reacting a tetracarboxylic dianhydride represented by the following general formula (30) with a mixture of a diamine represented by the above general formula (22) and a diamine represented by the following general formula (31) to synthesize an amic acid, and then forming an imide ring through a thermal dehydration step.

[ solution 63]

In the formula, X₆As before.

[ solution 64]

In the formula, R₂～R₅、m₁、m₂、m₃As before.

The tetracarboxylic dianhydride represented by the general formula (30) includes the tetracarboxylic dianhydride represented by the general formula (21) shown above as an example.

The diamine represented by the above general formula (31) includes, for example: 1, 2-bis (aminoethoxy) ethane, HK-511, ED-600, ED-900, ED-2003, EDR-148, EDR-176, D-230, D-400, D-2000, THF-100, THF-140, THF-170, RE-600, RE-900, RE-2000, RP-405, RP-409, RP-2005, RP-2009, RT-1000, HE-1000, HT-1700 (trade name, manufactured by Huntsman corporation), etc., but are not limited thereto.

(introduction of molecular weight of Polymer and end-capping reagent)

The alkali-soluble resin preferably has a molecular weight of 5,000 to 100,000, more preferably 7,000 to 30,000. When the molecular weight is 5,000 or more, it is easy to form a film of a photosensitive resin composition obtained by using the alkali-soluble resin as a base resin on a substrate to a desired film thickness, and when the molecular weight is 100,000 or less, the viscosity of the photosensitive resin composition is not significantly high, and there is no fear that the film cannot be formed.

The alkali-soluble resin may be capped at both ends with a capping agent in order to control the molecular weight during polycondensation reaction and to suppress gelation, i.e., a change in the molecular weight of the obtained polymer with the passage of time. Examples of the end-capping agent to be reacted with an acid dianhydride include monoamines and monoalcohols. Examples of the end-capping agent to be reacted with the diamine compound include acid anhydrides, monocarboxylic acids, monoacyl chlorides, mono-active ester compounds, dicarbonates, vinyl ethers, and the like. Further, by reacting the end-capping agent, various organic groups can be introduced as terminal groups.

Monoamines usable as the capping agent for the terminal of the acid anhydride group include: aniline, 5-amino-8-hydroxyquinoline, 4-amino-8-hydroxyquinoline, 1-hydroxy-8-aminonaphthalene, 1-hydroxy-7-aminonaphthalene, 1-hydroxy-6-aminonaphthalene, 1-hydroxy-5-aminonaphthalene, 1-hydroxy-4-aminonaphthalene, 1-hydroxy-3-aminonaphthalene, 1-hydroxy-2-aminonaphthalene, 1-amino-7-hydroxynaphthalene, 2-hydroxy-7-aminonaphthalene, 2-hydroxy-6-aminonaphthalene, 2-hydroxy-5-aminonaphthalene, 2-hydroxy-4-aminonaphthalene, 2-hydroxy-3-aminonaphthalene, alpha-hydroxy-8-aminonaphthalene, alpha-hydroxy-5-aminonaphthalene, alpha-hydroxy-2-aminonaphthalene, alpha-hydroxy-6-aminonaphthalene, alpha-hydroxy-5-aminonaphthalene, alpha-hydroxy-, 1-amino-2-hydroxynaphthalene, 1-carboxy-8-aminonaphthalene, 1-carboxy-7-aminonaphthalene, 1-carboxy-6-aminonaphthalene, 1-carboxy-5-aminonaphthalene, 1-carboxy-4-aminonaphthalene, 1-carboxy-3-aminonaphthalene, 1-carboxy-2-aminonaphthalene, 1-amino-7-carboxynaphthalene, 2-carboxy-7-aminonaphthalene, 2-carboxy-6-aminonaphthalene, 2-carboxy-5-aminonaphthalene, 2-carboxy-4-aminonaphthalene, 2-carboxy-3-aminonaphthalene, 1-amino-2-carboxynaphthalene, 2-amino-3-picolinic acid, 4-amino-3-pyridinecarboxylic acid, 5-amino-3-pyridinecarboxylic acid, 6-amino-3-pyridinecarboxylic acid, 4-amino-2-hydroxybenzoic acid, 5-amino-2-hydroxybenzoic acid, 6-amino-2, 4-dihydroxy-1, 3, 5-triazine (Ammelide), 2-aminobenzoic acid, 3-aminobenzoic acid, 4-aminobenzoic acid, 2-aminobenzenesulfonic acid, 3-aminobenzenesulfonic acid, 4-aminobenzenesulfonic acid, 3-amino-4, 6-dihydroxypyrimidine, 2-aminophenol, 3-aminophenol, 4-aminophenol, 5-amino-8-mercaptoquinoline, 5-amino-2-pyridinecarboxylic acid, 2-aminobenzoic acid, 4-aminopyridinecarboxylic acid, 4-amino-8-mercaptoquinoline, 1-mercapto-8-aminonaphthalene, 1-mercapto-7-aminonaphthalene, 1-mercapto-6-aminonaphthalene, 1-mercapto-5-aminonaphthalene, 1-mercapto-4-aminonaphthalene, 1-mercapto-3-aminonaphthalene, 1-mercapto-2-aminonaphthalene, 1-amino-7-mercaptonaphthalene, 2-mercapto-7-aminonaphthalene, 2-mercapto-6-aminonaphthalene, 2-mercapto-5-aminonaphthalene, 2-mercapto-4-aminonaphthalene, 2-mercapto-3-aminonaphthalene, 1-amino-2-mercaptonaphthalene, 3-amino-4, 6-dimercaptopyrimidine, 2-aminothiophenol, 3-aminothiophenol, 4-aminothiophenol, 2-ethynylaniline, 3-ethynylaniline, 4-ethynylaniline, 2, 4-diethynylaniline, 2, 5-diethynylaniline, 2, 6-diethynylaniline, 3, 4-diethynylaniline, 3, 5-diethynylaniline, 1-ethynyl-2-aminonaphthalene, 1-ethynyl-3-aminonaphthalene, 1-ethynyl-4-aminonaphthalene, 1-ethynyl-5-aminonaphthalene, 1-ethynyl-6-aminonaphthalene, 1-ethynyl-7-aminonaphthalene, 1-ethynyl-8-aminonaphthalene, aminonaphthalene, 2-ethynyl-1-aminonaphthalene, 2-ethynyl-3-aminonaphthalene, 2-ethynyl-4-aminonaphthalene, 2-ethynyl-5-aminonaphthalene, 2-ethynyl-6-aminonaphthalene, 2-ethynyl-7-aminonaphthalene, 2-ethynyl-8-aminonaphthalene, 3, 5-diacetylene-1-aminonaphthalene, 3, 5-diacetylene-2-aminonaphthalene, 3, 6-diacetylene-1-aminonaphthalene, 3, 6-diacetylene-2-aminonaphthalene, 3, 7-diacetylene-1-aminonaphthalene, 3, 7-diacetylene-2-aminonaphthalene, 4, 8-diacetylene-1-aminonaphthalene, 2-ethynyl-5-aminonaphthalene, 3, 5-diacetylene-1-aminonaphthalene, 2-ethynyl-6, 4, 8-diacetylene-2-aminonaphthalene, and the like, but is not limited thereto. These may be used alone in 1 kind, or may be used in combination of 2 or more kinds.

On the other hand, examples of the monoalcohol usable as the end-capping agent for the terminal of the acid anhydride group include: methanol, ethanol, 1-propanol, 2-propanol, 1-butanol, 2-butanol, 1-pentanol, 2-pentanol, 3-pentanol, 1-hexanol, 2-hexanol, 3-hexanol, 1-heptanol, 2-heptanol, 3-heptanol, 1-octanol, 2-octanol, 3-octanol, 1-nonanol, 2-nonanol, 1-decanol, 2-decanol, 1-undecanol, 2-undecanol, 1-dodecanol, 2-dodecanol, 1-tridecanol, 2-tridecanol, 1-tetradecanol, 2-tetradecanol, 1-pentadecanol, 2-pentadecanol, 1-hexadecanol, 2-hexadecanol, 1-heptadecanol, 2-heptadecanol, 1-octadecanol, 2-octadecanol, 1-nonadecanol, 2-nonadecanol, 1-eicosanol, 2-methyl-1-propanol, 2-methyl-2-propanol, 2-methyl-1-butanol, 3-methyl-1-butanol, 2-methyl-2-butanol, 3-methyl-2-butanol, 2-propyl-1-pentanol, 2-ethyl-1-hexanol, 4-methyl-3-heptanol, 6-methyl-2-heptanol, 2,4, 4-trimethyl-1-hexanol, 2, 6-dimethyl-4-heptanol, isononanol, 3, 7-dimethyl-3-octanol, 2-methyl-2-heptanol, isononanol, 3, 7-dimethyl-3-octanol, and, 2, 4-dimethyl-1-heptanol, 2-heptylundecanol, ethylene glycol monoethyl ether, ethylene glycol monomethyl ether, ethylene glycol monobutyl ether, propylene glycol-1-methyl ether, diethylene glycol monoethyl ether, diethylene glycol monomethyl ether, diethylene glycol monobutyl ether, cyclopentanol, cyclohexanol, monomethylolcyclopentane, monomethyloldicyclopentane, monomethyloltricyclodecane, norbornane, terpineol, and the like, but are not limited thereto. Further, they can be used alone in 1 kind, also can be combined with more than 2 kinds.

Examples of the acid anhydride, monocarboxylic acid, monoacyl chloride, and mono-active ester compound which can be used as the capping agent for the amino terminal include: anhydrides such as phthalic anhydride, maleic anhydride, nadic anhydride, cyclohexane anhydride, and 3-hydroxyphthalic anhydride; 2-carboxyphenol, 3-carboxyphenol, 4-carboxyphenol, 2-carboxythiophenol, 3-carboxythiophenol, 4-carboxythiophenol, 1-hydroxy-8-carboxynaphthalene, 1-hydroxy-7-carboxynaphthalene, 1-hydroxy-6-carboxynaphthalene, 1-hydroxy-5-carboxynaphthalene, 1-hydroxy-4-carboxynaphthalene, 1-hydroxy-3-carboxynaphthalene, 1-hydroxy-2-carboxynaphthalene, 1-mercapto-8-carboxynaphthalene, 1-mercapto-7-carboxynaphthalene, 1-mercapto-6-carboxynaphthalene, 1-mercapto-5-carboxynaphthalene, 1-mercapto-4-carboxynaphthalene, 1-mercapto-3-carboxynaphthalene, 2-hydroxy-6-carboxynaphthalene, 2-carboxynaphthalene, 1-mercapto-hydroxy-5-carboxynaphthalene, 1-mercapto-4-carboxynaphthalene, 1-mercapto-3-carboxynaphthalene, 2-carboxy, 1-mercapto-2-carboxynaphthalene, 2-carboxybenzenesulfonic acid, 3-carboxybenzenesulfonic acid, 4-carboxybenzenesulfonic acid, 2-ethynylbenzoic acid, 3-ethynylbenzoic acid, 4-ethynylbenzoic acid, 2, 4-diacetylynylbenzoic acid, 2, 5-diacetylynylbenzoic acid, 2, 6-diacetylynylbenzoic acid, 3, 4-diacetylynylbenzoic acid, 3, 5-diacetylynylbenzoic acid, 2-ethynyl-1-naphthoic acid, 3-ethynyl-1-naphthoic acid, 4-ethynyl-1-naphthoic acid, 5-ethynyl-1-naphthoic acid, 6-ethynyl-1-naphthoic acid, 7-ethynyl-1-naphthoic acid, p-ethynyl-1-, Monoacyl chlorides obtained by acid-chlorinating carboxylic acid units such as 8-ethynyl-1-naphthoic acid, 2-ethynyl-2-naphthoic acid, 3-ethynyl-2-naphthoic acid, 4-ethynyl-2-naphthoic acid, 5-ethynyl-2-naphthoic acid, 6-ethynyl-2-naphthoic acid, 7-ethynyl-2-naphthoic acid and 8-ethynyl-2-naphthoic acid, and terephthalic acid, phthalic acid, maleic acid, cyclohexanedicarboxylic acid, 3-hydroxyphthalic acid, 5-norbornene-2, 3-dicarboxylic acid, 1, 2-dicarboxylnaphthalene, 1, 3-dicarboxylnaphthalene, 1, 4-dicarboxylnaphthalene, 2-dicarboxylnaphthalene, 3-dicarboxylnaphthalene, and the like, And monoacyl chlorides obtained by acid-chlorinating only a single carboxyl group of dicarboxylic acids such as 1, 5-dicarboxylnaphthalene, 1, 6-dicarboxylnaphthalene, 1, 7-dicarboxylnaphthalene, 1, 8-dicarboxylnaphthalene, 2, 3-dicarboxylnaphthalene, 2, 6-dicarboxylnaphthalene, and 2, 7-dicarboxylnaphthalene, and active ester compounds obtained by reacting a monoacyl chloride with N-hydroxybenzotriazole or N-hydroxy-5-norbornene-2, 3-dicarboxylimide.

The dicarbonate compounds which can be used as the end-capping agent for the amino terminal include: di (tert-butyl) dicarbonate, dibenzyl dicarbonate, dimethyl dicarbonate, diethyl dicarbonate, etc.

Examples of vinyl ether compounds which can be used as the blocking agent for the amino terminal include: butyl vinyl ether, cyclohexyl vinyl ether, ethyl vinyl ether, 2-ethylhexyl vinyl ether, isobutyl vinyl ether, isopropyl vinyl ether, n-propyl vinyl ether, t-butyl vinyl ether, benzyl vinyl ether, and the like.

Other compounds which can be used as blocking agents for the amino terminus are listed: chloroformates such as benzoyl chloride, fluorene chloroformate, 2,2, 2-trichloroethyl chloroformate, tert-butyl chloroformate, n-butyl chloroformate, isobutyl chloroformate, benzyl chloroformate, allyl chloroformate, ethyl chloroformate and isopropyl chloroformate; isocyanato compounds such as butyl isocyanate, 1-naphthyl isocyanate, octadecyl isocyanate and phenyl isocyanate; methanesulfonyl chloride, p-toluenesulfonyl chloride, and the like.

The introduction ratio of the end-capping agent at the acid anhydride group terminal is preferably in the range of 0.1 to 60 mol%, particularly preferably 5 to 50 mol%, and still more preferably 5 to 20 mol%, based on the raw material of the alkali-soluble resin of the present invention, that is, the tetracarboxylic dianhydride component of the general formula (21). The amount of the end-capping agent introduced into the amino terminal is preferably in the range of 0.1 to 100 mol%, particularly preferably 5 to 90 mol%, based on the diamine component. Alternatively, a plurality of different terminal groups may be introduced by reacting a plurality of end-capping agents.

[ (A-2) resin having heterocyclic skeleton with nitrogen atom ]

The component (a-2) of the present invention is a resin containing at least 1 or more kinds of structures selected from a polyimide structure, a polybenzoxazole structure, a polyamideimide structure, and a precursor structure thereof, which does not contain an alkali-soluble group and has a heterocyclic skeleton having at least 1 or more nitrogen atoms at the molecular end. The resin is not particularly limited as long as it contains the specific structure without an alkali-soluble group, and may contain a structure represented by the following general formula (1).

[ solution 65]

Wherein W is a 1-valent organic group having a heterocyclic skeleton containing at least 1 or more nitrogen atoms, and X₁Is as follows from the aforementioned X₃Identical or different 4-valent organic radicals, X₂Is as follows from the aforementioned X₈Identical or different 2-valent organic groups, l represents an integer from 1 to 1000.

The alkali-soluble group is a functional group that increases the solubility of the resin in an alkali solution by interacting with or reacting with an alkali, and specific examples thereof include an acidic group and the like. Desirable alkali-soluble groups include: hydroxyalkyl groups, sulfonic acid groups, and thiol groups, in which the carbon atom at the α -position of a carboxyl group, a phenolic hydroxyl group, or an alcoholic hydroxyl group is substituted with an electron-attracting group. For example, a group having an acid dissociation constant (pKa) of the same degree as that of the phenolic hydroxyl group (e.g., a group having a pKa in the range of 6 to 12) is an alkali-soluble group.

The component (A-2) of the present invention does not have such an alkali-soluble group in the structural unit of the resin and/or at the end of the main chain thereof.

W in the general formula (1) is a 1-valent organic group having a heterocyclic skeleton having at least 1 or more nitrogen atoms, and preferably a 1-valent organic group represented by the following formula (32), but is not limited thereto. The structure of W may be 1 or a combination of 2 or more.

[ solution 66]

Wherein the dotted line represents a bond.

W in the general formula (1) has such an organic group at the molecular terminal, and therefore, the elongation of the cured film of the photosensitive composition of the invention using the alkali-soluble resin (A-1) and the resin (A-2) is improved. This is considered to be due to the fact that the alkali-soluble group of the alkali-soluble resin (A-1) and the organic group represented by W in the resin (A-2) form a hydrogen bond between molecules, whereby the resin (A-1) and the resin (A-2) are moderately entangled, and the intermolecular interaction of the resins (A-1) with each other and the resins (A-1) and (A-2) is enhanced.

In this case, if the 1-valent organic group (functional group represented by W) having a heterocyclic skeleton having at least 1 or more nitrogen atoms in the resin (a-2) is present in the molecular skeleton without a molecular end, the intermolecular interaction due to hydrogen bonding with the resin (a-1) becomes excessive and the desired effect cannot be obtained. Therefore, the organic group must have at least 1 or more at the molecular end.

In this case, since the resin (a-2) has an alkali-soluble group, hydrogen bonds are formed in the molecules of the resin (a-2) or between the molecules of the resins (a-2), and thus a desired effect cannot be obtained, and gelation proceeds during resin synthesis, so that it is necessary to have no alkali-soluble group.

In the above general formula (1), l represents an integer of 1 to 1000, preferably an integer of 1 to 100, more preferably an integer of 1 to 50. When l is more than 1000, the amount of the terminal organic group W which interacts with the alkali-soluble resin (A-1) is relatively decreased, so that l is preferably 1000 or less, particularly preferably 50 or less.

In this case, the amount of the resin (A-2) to be added is preferably 5 parts by mass or more and 50 parts by mass or less based on 100 parts by mass of the alkali-soluble resin (A-1). When the amount is 5 parts by mass or more, the effect of interaction with the alkali-soluble resin (A-1) as described above can be obtained, and when the amount is 50 parts by mass or less, the problem of residue and the like in the photolithography patterning due to the absence of alkali solubility of (A-2) itself is not caused, so that the amount of the resin (A-2) is preferably within the above range. The amount of the resin (A-2) added is preferably 5 parts by mass or more and 30 parts by mass or less. By setting within this range, the effect of the above-described interaction and the lithographic patterning are well balanced.

[ (B) photosensitizer ]

The component (B) in the positive photosensitive resin composition of the present invention is a photosensitizer which generates an acid by light and increases the dissolution rate in an aqueous alkali solution, and is a compound having a quinonediazide structure. (B) As the component (B), a compound having a1, 2-naphthoquinonediazidosulfonyl group in the molecule can be exemplified.

Examples of the compound having a1, 2-naphthoquinonediazide sulfonyl group in the molecule include compounds having a1, 2-naphthoquinonediazide sulfonyl group represented by the following general formula (33) or (34) in the molecule.

[ solution 67]

[ solution 68]

Specifically, as the compound to which the 1, 2-naphthoquinone diazide sulfonyl group is introduced, a trihydroxybenzophenone or tetrahydroxybenzophenone, a ballast molecule (ballast molecular) having a phenolic hydroxyl group represented by the following general formula (35), or a novolak resin having a weight average molecular weight of a repeating unit represented by the following formula (40) of 2,000 to 20,000, preferably 3,000 to 10,000 can be preferably used. That is, it is preferable to use, as the component (B), a resin having a phenolic hydroxyl group or a compound in which a hydrogen atom of the phenolic hydroxyl group is substituted with the above-mentioned 1, 2-naphthoquinonediazidosulfonyl group.

[ solution 69]

Herein, R is¹⁰¹～R¹⁰⁶Each independently is a hydrogen atom, a methyl group, a group represented by the following formula (36), or a group represented by the following formula (37). w is an integer of 0 to 2, z is an integer of 0 to 2, and when z is 0, w is 1 or 2. When z is 0 and w is 1, A is a hydrogen atom, a methyl group, or a group represented by the following formula (36), when z is 0 and w is 2, one of A is a methylene group or a group represented by the following formula (38), the other A is a hydrogen atom, a methyl group, or a group represented by the following formula (36), and when z is 1, A is a methylene group or a group represented by the following formula (38)A group. When z is 2 and w is 1, A is methine or a group represented by the following formula (39), when z is 2 and w is 2, one of A is methylene or a group represented by the following formula (38), and the other A is methine or a group represented by the following formula (39).

[ solution 70]

Wherein a1, a2, a3, a4, a5, a6 and a7 are integers of 0 to 3, respectively, but a1+ a2 is not more than 5, a3+ a4 is not more than 4, and a6+ a7 is not more than 3.

In this case, the number of the low nucleus (ballast molecular) of the formula (35) is preferably 2 to 20, more preferably 2 to 10, even more preferably 3 to 6, and the ratio of the number of the phenolic hydroxyl groups to the number of the benzene rings is preferably 0.5 to 2.5, more preferably 0.7 to 2.0, even more preferably 0.8 to 1.5.

Specific examples of such a low nucleus (ballast molecular) include the following ones.

[ solution 71]

[ chemical formula 72]

[ solution 73]

[ chemical formula 74]

[ solution 75]

[ 76]

[ solution 77]

Among the above-exemplified low nucleus bodies (ballast molecules), compounds in which the hydrogen atom of the phenolic hydroxyl group of the ballast molecule is substituted with 1, 2-naphthoquinonediazide sulfonyl group, such as (B-3), (B-29), (B-33) and (B-38), can be preferably used as the component (B) of the positive photosensitive resin composition of the present invention.

[ solution 78]

Wherein mm is an integer of 0 to 3.

The novolak resin having the repeating unit represented by the above formula (40) can be synthesized by condensing a phenol represented by the following formula (41) and an aldehyde by a usual method, and the phenol represented by the following formula (41) is specifically at least 1 kind of phenol among o-cresol, m-cresol, p-cresol, 3, 5-dimethylphenol, and the like.

[ solution 79]

Wherein mm is an integer of 0 to 3.

In this case, examples of the aldehydes include: formaldehyde, paraformaldehyde (paraformaldehyde), acetaldehyde, benzaldehyde and the like, and formaldehyde is preferable.

The ratio of the phenol represented by the above formula (41) to the aldehyde is preferably 0.2 to 2, particularly preferably 0.3 to 2, in terms of a molar ratio.

As a method for introducing a1, 2-naphthoquinonediazide sulfonyl group into a compound into which the above-mentioned 1, 2-naphthoquinonediazide sulfonyl group is introduced, it is preferable to use a dehydrochlorination condensation reaction of a phenolic hydroxyl group with a1, 2-naphthoquinonediazide sulfonyl chloride using a base catalyst. In the case of the tranquilizer molecule represented by the above formula (35), trihydroxybenzophenone or tetrahydroxybenzophenone, the ratio of the hydrogen atom of the phenolic hydroxyl group to 1, 2-naphthoquinone diazide sulfonyl group is preferably 10 to 100 mol%, more preferably 50 to 100 mol%, and in the case of the novolak resin having the repeating unit represented by the above formula (40), the ratio of the hydrogen atom of the phenolic hydroxyl group to 1, 2-naphthoquinone diazide sulfonyl group is preferably 2 to 50 mol%, more preferably 3 to 27 mol%.

(B) The amount of the component (B) to be added is preferably 1 to 50 parts by mass, more preferably 10 to 40 parts by mass, based on 100 parts by mass of the component (A-1). Further, 1 kind of component (B) may be used or 2 or more kinds may be used in combination.

By blending such a component (B), the solubility in an aqueous alkali solution is suppressed by the dissolution-preventing property of the component (B) before exposure, and the system becomes alkali-insoluble, and during exposure, the photosensitizer of the component (B) generates an acid by light, and the dissolution rate in an aqueous alkali solution increases, and the system becomes alkali-soluble.

That is, when an alkaline aqueous solution is used as the developer, the unexposed portion is not dissolved in the developer, and the exposed portion is dissolved in the developer, so that a positive pattern can be formed.

[ (D) solvent ]

Then, the component (D) in the positive photosensitive resin composition is a solvent. (D) The solvent for component (B) is not limited as long as it dissolves component (A-1), component (A-2) and component (B). Examples of the solvent include: ketones such as cyclohexanone, cyclopentanone, and methyl-2-n-amyl ketone; alcohols such as 3-methoxybutanol, 3-methyl-3-methoxybutanol, 1-methoxy-2-propanol, and 1-ethoxy-2-propanol; ethers such as propylene glycol monomethyl ether, ethylene glycol monomethyl ether, propylene glycol monoethyl ether, ethylene glycol monoethyl ether, propylene glycol dimethyl ether, and diethylene glycol dimethyl ether; and esters such as propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether acetate, ethyl lactate, ethyl pyruvate, butyl acetate, methyl 3-methoxypropionate, ethyl 3-ethoxypropionate, t-butyl acetate, t-butyl propionate, propylene glycol mono-t-butyl ether acetate, and γ -butyrolactone, and 1 or more of these esters can be used. Particularly, ethyl lactate, cyclohexanone, cyclopentanone, propylene glycol monomethyl ether acetate, γ -butyrolactone, or a mixed solvent thereof is preferable.

(D) The amount of the component (B) is preferably 50 to 2,000 parts by mass, particularly preferably 100 to 1,000 parts by mass, based on 100 parts by mass of the total amount of the components (A-1), (A-2) and (B).

[ (C) crosslinking agent ]

The positive photosensitive resin composition of the present invention preferably contains, in addition to the above-mentioned (A-1), (A-2), (B) and (D) components which are essential components, (C) a crosslinking agent selected from 1 or 2 or more of a formaldehyde-or formaldehyde-alcohol-modified amino condensate, a phenol compound having an average of 2 or more methylol groups or alkoxymethylol groups in 1 molecule, a compound in which a hydrogen atom of a hydroxyl group of a polyhydric phenol is substituted with a glycidyl group, a compound in which a hydrogen atom of a hydroxyl group of a polyhydric phenol is substituted with a substituent represented by the following formula (C-1), and a compound containing 2 or more nitrogen atoms having a glycidyl group represented by the following formula (C-2).

[ solution 80]

Wherein the dotted line represents a bond, Rc represents a linear, branched or cyclic alkyl group having 1 to 6 carbon atoms, and v represents 1 or 2.

The component (C) in the positive photosensitive resin composition of the present invention is 1 or 2 or more crosslinking agents selected from the group consisting of an amino condensate modified with formaldehyde or formaldehyde-alcohol, a phenol compound having an average of 2 or more methylol groups or alkoxymethylol groups in 1 molecule, a compound in which a hydrogen atom of a hydroxyl group of a polyhydric phenol is substituted with an epoxypropyl group, a compound in which a hydrogen atom of a hydroxyl group of a polyhydric phenol is substituted with a group represented by the following formula (C-1), and a compound containing 2 or more nitrogen atoms having an epoxypropyl group represented by the following formula (C-2).

[ solution 81]

Wherein the dotted line represents a bond, Rc represents a linear, branched or cyclic alkyl group having 1 to 6 carbon atoms, and v represents 1 or 2.

Examples of the formaldehyde-or formaldehyde-alcohol-modified amino condensate include: a melamine condensate modified with formaldehyde or a formaldehyde-alcohol, or a urea condensate modified with formaldehyde or a formaldehyde-alcohol.

Examples of the preparation of the formaldehyde or formaldehyde-alcohol-modified melamine condensate include: first, a melamine monomer is modified by methylolation with formaldehyde or further modified by alkoxylation with an alcohol according to a known method to give a modified melamine represented by the following general formula (42). The alcohol is a lower alcohol, and for example, an alcohol having 1 to 4 carbon atoms is preferable.

[ solution 82]

In the formula, R₁₀The same or different, and is hydroxymethyl, alkoxymethyl containing C1-C4 alkoxy, or hydrogen atom, and at least 1 is hydroxymethyl or the above alkoxymethyl.

R is as defined above₁₀Examples thereof include: a hydroxymethyl group; an alkoxymethyl group such as a methoxymethyl group and an ethoxymethyl group; and hydrogen atoms, etc.

Specific examples of the modified melamine represented by the general formula (42) include: trimethoxymethyl monohydroxymethyl melamine, dimethoxymethyl monohydroxymethyl melamine, trimethylol melamine, hexamethylol melamine, hexamethoxy methylol melamine, and the like. Then, the modified melamine represented by the general formula (42) or its polymer (for example, oligomer such as dimer, trimer, etc.) and formaldehyde are subjected to addition condensation polymerization in accordance with a conventional method so as to have a desired molecular weight, whereby a melamine condensate modified with formaldehyde or formaldehyde-alcohol can be obtained.

Examples of the preparation of the formaldehyde-or formaldehyde-alcohol-modified urea condensate include: the urea condensate of a desired molecular weight is modified by methylolation with formaldehyde or further by alkoxylation with an alcohol according to a known method.

Specific examples of the formaldehyde or formaldehyde-alcohol modified urea condensate include: a methoxymethylated urea condensate, an ethoxymethylated urea condensate, a propoxymethylated urea condensate, and the like.

Further, 1 kind or 2 or more kinds of these modified melamine condensate and modified urea condensate may be used in combination.

Then, examples of the phenol compound having 2 or more hydroxymethyl groups or alkoxyhydroxymethyl groups on average in 1 molecule include: (2-hydroxy-5-methyl) -1, 3-benzenedimethanol, 2 ', 6, 6' -tetramethoxymethyl bisphenol A, and compounds represented by the following formulae (C-3) to (C-7).

[ solution 83]

The crosslinking agent may be used in 1 kind or in combination of 2 or more kinds.

On the other hand, examples of the compound in which a hydrogen atom of a hydroxyl group of a polyhydric phenol is substituted to an epoxypropyl group include compounds obtained by reacting a hydroxyl group of bisphenol a, tris (4-hydroxyphenyl) methane, 1,1, 1-tris (4-hydroxyphenyl) ethane and epichlorohydrin in the presence of a base. Preferable examples of the compound in which the hydrogen atom of the hydroxyl group of the polyhydric phenol is substituted with a glycidyl group include compounds represented by the following formulas (C-8) to (C-14).

[ solution 84]

In the formula, t is more than or equal to 2 and less than or equal to 3.

As the crosslinking agent, 1 or 2 of these compounds in which the hydroxyl group of the polyhydric phenol is substituted with a glycidoxy group (compounds in which the hydrogen atom of the hydroxyl group of the polyhydric phenol is substituted with a glycidyl group) can be used.

As the compound in which a hydrogen atom of a hydroxyl group of a polyhydric phenol is substituted with a substituent represented by the following formula (C-1), there can be mentioned compounds containing 2 or more of the above-mentioned substituents and represented by the following formula (C-15).

[ solution 85]

Wherein the dotted line represents a bond.

[ solution 86]

Wherein u is more than or equal to 1 and less than or equal to 3.

On the other hand, the compound containing 2 or more nitrogen atoms having a glycidyl group represented by the following formula (C-2) includes those represented by the following formula (C-16).

[ solution 87]

Wherein the dotted line represents a bond, Rc represents a linear, branched or cyclic alkyl group having 1 to 6 carbon atoms, and v represents 1 or 2.

[ solution 88]

Wherein W represents a linear, branched or cyclic alkylene group having 2 to 12 carbon atoms or a 2-valent aromatic group. In addition, W herein is applicable only to the above formula.

Examples of the compound represented by the above formula (C-16) include compounds represented by the following formulas (C-17) to (C-20).

[ solution 89]

On the other hand, as the compound containing 2 or more nitrogen atoms having a glycidyl group represented by the above formula (C-2), a compound represented by the following formula (C-21) can be preferably used.

[ solution 90]

These compounds containing 2 or more nitrogen atoms having a glycidyl group represented by the above formula (C-2) may use 1 or may use 2 as crosslinking agents.

(C) The component (a) is a component which causes a crosslinking reaction at the time of post-curing after the pattern formation of the positive photosensitive resin composition of the present invention and further increases the strength of the cured product. From the viewpoint of photo-curability and heat resistance, the weight average molecular weight of the component (C) is preferably from 150 to 10,000, particularly preferably from 200 to 3,000.

In the positive photosensitive resin composition of the present invention, the amount of the component (C) is preferably 0.5 to 50 parts by mass, particularly preferably 1 to 30 parts by mass, based on 100 parts by mass of the component (A-1).

[ (E) Compounds which generate acid by Heat ]

The positive photosensitive resin composition of the present invention may further contain (E) a compound which generates an acid by heat. In the step of heating at 100 to 300 ℃ and post-curing after the pattern formation, the crosslinking reaction with the component (A-1) is promoted by heat, and a compound which generates an acid by heat of the component (E) may be added.

In particular, the component (E) is preferably one which does not promote the hardening of the film before the patterning by development and does not inhibit the patterning. In order to achieve the above conditions, it is preferable that the component (E) does not generate an acid at the temperature of the step of removing the solvent and drying after the photosensitive resin composition is coated, and the acid is generated only by the heat treatment after the pattern formation to accelerate the curing of the pattern or the coating of the positive photosensitive resin composition. Specifically, it is preferable to use a compound which is decomposed by heat treatment at 100 to 300 ℃ and preferably 150 to 300 ℃ to generate an acid. By containing the component (E), the positive photosensitive resin composition can be converted into a pattern or a coating film which is further subjected to crosslinking and curing reaction in the step of heating at 100 to 300 ℃ and post-curing after the pattern or the coating film of the positive photosensitive resin composition is patterned. (E) The component (C) can further improve the mechanical strength, chemical resistance, adhesion and the like of the obtained pattern or coating film by further advancing the crosslinking and curing reaction.

As the compound which generates an acid by heat, the compounds described in paragraphs [0061] to [0085] of Japanese patent laid-open No. 2007-199653 can be preferably used.

The amount of the compound generating an acid by heat is preferably 0.1 parts by mass or more, more preferably 0.5 parts by mass or more, further preferably 30 parts by mass or less, and still more preferably 10 parts by mass or less, per 100 parts by mass of the (a-1) component in the positive photosensitive resin composition of the present invention.

[ other ingredients ]

The positive photosensitive resin composition of the present invention may further contain components other than the component (A-1), the component (A-2), the component (B), the component (C), the component (D) and the component (E). Other components may be exemplified by: the adhesion assistant, the surfactant (G), and the like, and the surfactant (G) can be preferably a compound exemplified below.

(G) The surfactant is preferably nonionic, for example, a fluorine-based surfactant, and specifically, there may be mentioned: perfluoroalkyl polyoxyethylene ethanol, fluorinated alkyl ester, perfluoroalkyl amine oxide, fluorine-containing organosiloxane compound, and the like.

Commercially available surfactants can be used, and examples thereof include: FLUORAD "FC-4430" (manufactured by Sumitomo 3M (Strand)), SURLON "S-141" and "S-145" (manufactured by Asahi Nitro (Strand), UNIDYNE "DS-401", "DS-4031" and "DS-451" (manufactured by Dajin industries, Ltd.), MEGAFACE "F-8151" (manufactured by DIC (Strand)), and "X-70-093" (manufactured by shin-Etsu chemical industry (Strand)). Among them, FLUORAD "FC-4430" (manufactured by Sumitomo 3M (Kagaku)) and "X-70-093" (manufactured by shin-Etsu chemical industries) are preferable.

(Pattern Forming method)

The present invention provides a pattern forming method, characterized by comprising the steps of:

(1) coating the positive photosensitive resin composition on a substrate to form a photosensitive material film,

(2) then, after heating treatment, exposing the photosensitive material film with high-energy rays or electron beams with the wavelength of 190-500 nm at intervals of a photomask, and

(3) the development is performed using a developer of an aqueous alkali solution.

The following describes a method for forming a pattern using the positive photosensitive resin composition of the present invention.

The positive photosensitive resin composition of the present invention can be formed into a pattern by a known photolithography technique, for example, by applying the photosensitive resin composition to a silicon wafer or SiO by spin coating (spin coating)₂A substrate, a SiN substrate, or a substrate having a pattern such as copper wiring, is pre-baked at 80 to 130 ℃ for about 50 to 600 seconds to form a photosensitive material film having a thickness of 1 to 50 μm, preferably 1 to 30 μm, more preferably 5 to 20 μm.

The spin coating method can apply the photosensitive resin composition to the substrate by dispensing about 5mL of the photosensitive resin composition onto the silicon substrate and then rotating the substrate. In this case, the film thickness of the photosensitive material film on the substrate can be easily adjusted by adjusting the rotation speed.

Then, a mask for forming a desired pattern is masked on the photosensitive material film, and high-energy radiation or electron beam having a wavelength of 190 to 500nm such as i-ray and g-ray is irradiated to the mask so that the exposure amount is about 1 to 5,000mJ/cm²Preferably about 100 to 2,000mJ/cm²。

Then, optionally, a post-exposure heat treatment (post-exposure bake (PEB)) may be performed on the hot plate at 60 to 150 ℃ for 1 to 10 minutes, preferably 80 to 120 ℃ for 1 to 5 minutes.

Thereafter, development is applied. The positive photosensitive resin composition of the present invention can be subjected to alkali development with an aqueous alkali solution.

On the other hand, a preferable aqueous alkali solution to be used for the alkali development is a 2.38% aqueous tetramethylammonium hydroxide (TMAH) solution. The development can be carried out by a usual method such as a spray method or a dipping method, or by dipping in a developer. Thereafter, cleaning, rinsing, drying, etc. may be performed as necessary to obtain a photoresist film having a desired pattern.

(method of Forming hardened coating)

The cured coating film can be formed by post-curing the coating film having a pattern formed by the above-mentioned pattern forming method by heating at a temperature of 100 to 300 ℃, preferably 150 to 300 ℃, more preferably 180 to 250 ℃ using an oven or a hot plate. When the post-curing temperature is 100 to 300 ℃, the crosslinking density of the film of the photosensitive resin composition can be increased and the remaining volatile components can be removed, and the post-curing temperature is preferably from the viewpoint of adhesion to a substrate, heat resistance, strength, and more preferably from the viewpoint of electrical characteristics. Then, the post-curing time may be set to 10 minutes to 10 hours.

The purpose of the formed pattern is to use the protective coating for covering wiring, circuits, substrates, etc., which has excellent insulating properties, exhibits excellent adhesion to a metal layer such as Cu of the wiring or circuit to be covered, a metal electrode present on the substrate, or an insulating substrate such as SiN of the wiring or circuit to be covered, has a corresponding mechanical strength as the protective coating, and can further significantly improve the resolution performance for forming fine patterns.

(hardening coating film)

The cured coating obtained in this manner is excellent in adhesion to a substrate, heat resistance, electrical characteristics, mechanical strength, and chemical resistance against an alkaline peeling solution, and also excellent in reliability of a semiconductor element using the cured coating as a protective coating, and particularly can prevent the occurrence of cracks in a temperature cycle test, and is preferably used as a protective coating (interlayer insulating film or surface protective film) for electric and electronic components, semiconductor elements, and the like.

That is, the present invention provides an interlayer insulating film or a surface protective film comprising a cured film obtained by curing the positive photosensitive resin composition.

The protective coating film is effective for use in, for example, an insulating film for a semiconductor element including a rewiring use, an insulating film for a multilayer printed board, a solder resist mask, a cover layer film, and the like, because of its heat resistance, chemical resistance, and insulation properties.

The present invention also provides an electronic component having the interlayer insulating film or the surface protective film.

The electronic component has a protective coating (interlayer insulating film or surface protective film) having heat resistance, chemical resistance and insulation properties, and thus has excellent reliability.

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Resin composition, method for forming pattern, method for forming cured coating, interlayer insulating film, surface protective film, and electronic component

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