Photosensitive resin composition and cured film
阅读说明：本技术 光敏树脂组合物和固化膜 (Photosensitive resin composition and cured film ) 是由 黄承渊 崔大胜 李旼炯 郑东旻 于 2018-11-09 设计创作，主要内容包括：本发明涉及包含具有特定结构的聚酰胺-酰亚胺树脂的光敏树脂组合物。(The present invention relates to a photosensitive resin composition comprising a polyamide-imide resin having a specific structure.)
1. A positive photosensitive resin composition comprising a polyamide-imide resin containing a repeating unit represented by the following chemical formula 1 and a repeating unit represented by the following chemical formula 2:
[ chemical formula 1]
[ chemical formula 2]
Wherein, in chemical formulas 1 and 2,
Q1and Q2Each independently an aliphatic divalent functional group, a cycloaliphatic divalent functional group or an aromatic divalent functional group, or a divalent organic group comprising at least one heteroatom selected from N, O and S;
Q1and Q2Comprises one or more of a hydroxyl group and a carboxyl group;
x is an aliphatic tetravalent organic radical, an alicyclic tetravalent organic radical or an aromatic tetravalent organic radical, or a tetravalent organic radical comprising at least one heteroatom selected from N, O and S;
y is an aliphatic divalent organic radical, an alicyclic divalent organic radical or an aromatic divalent organic radical, or a divalent organic radical comprising at least one heteroatom selected from N, O and S; and
n and m are each an integer of 1 or more.
2. The positive photosensitive resin composition according to claim 1, wherein Q is1And Q2Each including a divalent functional group represented by the following chemical formula 3:
[ chemical formula 3]
Wherein, in chemical formula 3,
L1is a single bond, -O-, -CO-, -S-, -SO2-、-C(CH3)2-、-C(CF3)2-、-CONH-、-COO-、-(CH2)n1-、-O(CH2)n2O-、-OCH2-C(CH3)2-CH2O-or-OCO (CH)2)n3OCO-, n1, n2 and n3 are each an integer of 1 to 10,
R1and R2Identical or different from one another and are hydrogen, halogen, alkyl having 1 to 10 carbon atoms, hydroxyl or carboxyl,
p and q are R substituted in the aromatic ring1And R2And is an integer of 1 to 4, and
r substituted in the aromatic ring1And R2At least one of which is hydroxyl or carboxyl.
3. The positive photosensitive resin composition according to claim 1, wherein X comprises a tetravalent group represented by the following chemical formula 4:
[ chemical formula 4]
Wherein, in chemical formula 4,
a is a single bond, -O-, -CO-, -S-, -SO2-、-C(CH3)2-、-C(CF3)2-、-CONH-、-COO-、-(CH2)n1-、-O(CH2)n2O-or-OCO (CH)2)n3OCO-, and
n1, n2 and n3 are each integers of 1 to 10.
4. A negative-type photosensitive resin composition comprising a polyamide-imide resin containing a repeating unit represented by the following chemical formula 11 and a repeating unit represented by the following chemical formula 12, and a photoacid generator:
[ chemical formula 11]
[ chemical formula 12]
Wherein, in chemical formulas 11 and 12,
Q1and Q2Each independently an aliphatic divalent functional group, a cycloaliphatic divalent functional group or an aromatic divalent functional group, or a divalent organic group comprising at least one heteroatom selected from N, O and S;
Q1and Q2Comprises one or more of a hydroxyl group and a carboxyl group;
Q1and Q2Is substituted with a functional group containing a (meth) acryloyloxy group and an alkylene group having 1 to 20 carbon atoms, or a functional group containing a (meth) acrylate group and an alkylene glycol group having 1 to 20 carbon atoms;
x is an aliphatic tetravalent organic radical, an alicyclic tetravalent organic radical or an aromatic tetravalent organic radical, or a tetravalent organic radical comprising at least one heteroatom selected from N, O and S;
y is an aliphatic divalent organic radical, an alicyclic divalent organic radical or an aromatic divalent organic radical, or a divalent organic radical comprising at least one heteroatom selected from N, O and S; and
n and m are each an integer of 1 or more.
5. The negative-type photosensitive resin composition according to claim 4, wherein Q1And Q2Each including a divalent functional group represented by the following chemical formula 13:
[ chemical formula 13]
Wherein, in chemical formula 13,
L1is a single bond, -O-, -CO-, -S-, -SO2-、-C(CH3)2-、-C(CF3)2-、-CONH-、-COO-、-(CH2)n1-、-O(CH2)n2O-、-OCH2-C(CH3)2-CH2O-or-OCO (CH)2)n3OCO-，
n1, n2 and n3 are each integers of 1 to 10,
R1and R2May be identical to or different from one another and are hydrogen, halogen, alkyl having 1 to 10 carbon atoms, hydroxyl or carboxyl,
p and q are R substituted in the aromatic ring1And R2And is an integer of 1 to 4,
r substituted in the aromatic ring1And R2At least one of which is hydroxyl or carboxyl, and
R1and R2Is a functional group containing a (meth) acryloyloxy group and an alkylene group having 1 to 20 carbon atoms, or a functional group containing a (meth) acrylate group and an alkylene glycol group having 1 to 20 carbon atoms.
6. The negative-type photosensitive resin composition according to claim 5, wherein the functional group comprising a (meth) acryloyloxy group and an alkylene group having 1 to 20 carbon atoms or the functional group comprising a (meth) acrylate group and an alkylene glycol group having 1 to 20 carbon atoms is formed by reacting a hydroxyl group or a carboxyl group substituted in an aromatic ring with one of compounds represented by the following chemical formulae 14 to 16:
[ chemical formula 14]
[ chemical formula 15]
[ chemical formula 16]
7. The negative-type photosensitive resin composition according to claim 4, wherein X comprises a tetravalent functional group of the following chemical formula 4:
[ chemical formula 4]
Wherein, in chemical formula 4, A is a single bond, -O-, -CO-, -S-, -SO2-、-C(CH3)2-、-C(CF3)2-、-CONH-、-COO-、-(CH2)n1-、-O(CH2)n2O-or-OCO (CH)2)n3OCO-, and n1, n2 and n3 are each integers of 1 to 10.
8. The negative-type photosensitive resin composition of claim 4, further comprising a photocurable multifunctional acrylic compound.
9. A cured film comprising the photosensitive resin composition according to claim 1 or 4.
10. A method for producing a cured film, comprising a step of curing the photosensitive resin composition according to claim 1 or 4 at a temperature of 250 ℃ or less.
11. A method for forming a resist pattern, comprising the steps of:
forming a resist film on a substrate using the photosensitive resin composition according to claim 1 or 4;
irradiating the resist film with a high-energy ray in a pattern; and
the resist film is developed using an alkaline developer.
Technical Field
Cross Reference to Related Applications
This application claims the benefit of the filing date of korean patent application No. 10-2018-0024819, filed on 28.2.2018 to the korean intellectual property office, the entire contents of which are incorporated herein by reference.
The present invention relates to a photosensitive resin composition and a cured film.
Background
Photosensitive resins are typical functional polymer materials that have been practically used for the production of various products of the precision electronics and information industries, and are currently used in the high-tech industries, particularly for the production of semiconductors and displays.
Generally, a photosensitive resin means a polymer compound of: which undergoes chemical changes in the molecular structure in a short time by illumination with light, causing changes in physical properties such as solubility to a specific solvent, discoloration, and curing. Using the photosensitive resin, precision processing is achieved, energy and raw material usage can be greatly reduced compared to a thermal reaction process, and operations can be rapidly and accurately performed in a small installation space, so that the photosensitive resin is widely used in various precision electronic and information industry fields such as advanced printing fields, semiconductor production, display production, and photocurable surface coating materials.
Meanwhile, recently, as electronic devices become more highly integrated and formed with fine patterns, photosensitive resins capable of minimizing a defect rate and improving processing efficiency and resolution are required. Therefore, a method of using polyamic acid (polyamic acid), or the like as a photosensitive resin has been introduced.
However, polyamic acid (polyamide acid) is easily hydrolyzed by water in the air or the like, and thus storage property and stability are insufficient. Polyamic acid (polyamide acid) has low adhesion to a substrate to be applied, and has a problem in that physical properties of electric wiring and the substrate are deteriorated due to high-temperature application. In addition, with other types of photosensitive resins, chemical resistance, heat resistance and electrical characteristics in a final cured state are insufficient, or adhesion to a metal substrate is insufficient, and thus there is a problem in that it is peeled from the substrate during a developing or curing process.
In particular, there is a need to develop a photosensitive resin material: which is capable of forming an ultrafine pattern and also preventing thermal damage of a semiconductor device during a heat treatment process for curing a photosensitive resin composition.
Disclosure of Invention
Technical problem
An object of the present invention is to provide a photosensitive resin composition which can be cured with high efficiency even at a relatively low temperature and can provide a cured material having excellent mechanical characteristics and photosensitivity.
It is another object of the present invention to provide a cured film formed from the photosensitive resin composition.
It is still another object of the present invention to provide a method for producing a cured film which can be cured with high efficiency even at a relatively low temperature and can provide a cured material having excellent mechanical characteristics and photosensitivity.
Technical scheme
In the present invention, a positive photosensitive resin composition is provided, which includes a polyamide-imide resin containing a repeating unit represented by the following chemical formula 1 and a repeating unit represented by the following chemical formula 2, and a photoacid generator.
[ chemical formula 1]
[ chemical formula 2]
In chemical formulas 1 and 2, Q1And Q2Each independently an aliphatic divalent functional group, a cycloaliphatic divalent functional group or an aromatic divalent functional group, or a divalent organic group comprising at least one heteroatom selected from N, O and S; q1And Q2Comprises one or more of a hydroxyl group and a carboxyl group; x is an aliphatic tetravalent organic radical, an alicyclic tetravalent organic radical or an aromatic tetravalent organic radical, or a tetravalent organic radical comprising at least one heteroatom selected from N, O and S; y is an aliphatic divalent organic radical, an alicyclic divalent organic radical or an aromatic divalent organic radical, or a divalent organic radical comprising at least one heteroatom selected from N, O and S; and n and m are each an integer of 1 or more.
Further, in the present invention, there is provided a negative-type photosensitive resin composition comprising a polyamide-imide resin containing a repeating unit represented by the following chemical formula 11 and a repeating unit represented by the following chemical formula 12, and a photoacid generator.
[ chemical formula 11]
[ chemical formula 12]
In chemical formulas 11 and 12, Q1And Q2Each independently an aliphatic divalent functional group, a cycloaliphatic divalent functional group or an aromatic divalent functional group, or a divalent organic group comprising at least one heteroatom selected from N, O and S; q1And Q2Comprises one or more of a hydroxyl group and a carboxyl group; and Q1And Q2Is substituted with a functional group containing a (meth) acryloyloxy group and an alkylene group having 1 to 20 carbon atoms, or a functional group containing a (meth) acrylate group and an alkylene glycol group having 1 to 20 carbon atoms; x is an aliphatic tetravalent organic radical, an alicyclic tetravalent organic radical or an aromatic tetravalent organic radical, or a tetravalent organic radical comprising at least one heteroatom selected from N, O and S; y is an aliphatic divalent organic radical, an alicyclic divalent organic radical or an aromatic divalent organic radical, or a divalent radical comprising at least one heteroatom selected from N, O and SAn organic group; and n and m are each an integer of 1 or more.
Further, in the present invention, a cured film comprising a cured product of the photosensitive resin composition may be provided.
Further, in the present invention, a method for producing a cured film may be provided, the method including a step of curing the photosensitive resin composition at a temperature of 250 ℃ or less.
Further, in the present invention, there may be provided a method for forming a resist pattern, comprising the steps of: forming a resist film on a substrate using a photosensitive resin composition; irradiating the resist film with a pattern using high-energy rays; and developing the resist film using an alkaline developer.
Hereinafter, a photosensitive resin composition, a cured film, a method for preparing the cured film, and a method for forming a resist pattern according to embodiments of the present invention will be described in more detail.
Unless otherwise indicated, the technical terms used herein are used for the purpose of describing particular embodiments only, and are not intended to limit the scope of the present invention.
Furthermore, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
Furthermore, the terms "comprises" and "comprising," as used herein, are intended to specify the presence of stated features, ranges, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of other stated features, ranges, integers, steps, operations, elements, components, and/or groups thereof.
In the present invention, the weight average molecular weight means a weight average molecular weight in terms of polystyrene measured by a GPC method. In determining the weight average molecular weight in terms of polystyrene measured by the GPC method, a conventionally known analytical apparatus, a detector (e.g., a refractive index detector), and an analytical column may be used. Commonly applied temperature, solvent and flow conditions may be used. Specific examples of the measurement conditions are as follows: the Mw value can be determined using a calibration curve formed from polystyrene standards using a Waters PL-GPC220 instrument, using Polymer Laboratories PLgel MIX-B, 300mm column, using 1,2, 4-trichlorobenzene as the solvent at a flow rate of 1 mL/min, at an evaluation temperature of 160 deg.C to prepare a sample having a concentration of 10mg/10mL, which is then injected in an amount of 200. mu.L. The molecular weight of the polystyrene standards was 2000/10,000/30,000/70,000/200,000/700,000/2,000,000/4,000,000/10,000,000 nine.
According to an example of the present invention, a positive photosensitive resin composition may be provided, which includes a polyamide-imide resin containing a repeating unit represented by the following chemical formula 1 and a repeating unit represented by the following chemical formula 2, and a photoacid generator.
[ chemical formula 1]
[ chemical formula 2]
In chemical formulas 1 and 2, Q1And Q2Each independently an aliphatic divalent functional group, a cycloaliphatic divalent functional group or an aromatic divalent functional group, or a divalent organic group comprising at least one heteroatom selected from N, O and S; q1And Q2Comprises one or more of a hydroxyl group and a carboxyl group; x is an aliphatic tetravalent organic radical, an alicyclic tetravalent organic radical or an aromatic tetravalent organic radical, or a tetravalent organic radical comprising at least one heteroatom selected from N, O and S; y is an aliphatic divalent organic radical, an alicyclic divalent organic radical or an aromatic divalent organic radical, or a divalent organic radical comprising at least one heteroatom selected from N, O and S; and n and m are each an integer of 1 or more.
As a result of continued research, the present inventors have experimentally found that a photosensitive resin composition comprising a polyamide-imide resin containing a repeating unit of chemical formula 1 and a repeating unit of chemical formula 2 can be cured with high efficiency even at a relatively low temperature, and can provide a cured material having excellent mechanical characteristics and photosensitivity, thereby completing the present invention.
Specifically, the polyamide-imide resin has imide bonds in which at least 90% of the cyclization reaction has been completed, and, at the same time, has a carboxyl group or a hydroxyl group. Generally, it is known that if an imide bond is present, the solubility is reduced and it is hardly soluble in most organic solvents. In contrast, when a carboxyl group or a hydroxyl group is introduced into a polyamide-imide resin having a structure that is easily soluble in a polar solvent, photosensitivity may be achieved by introducing a photopolymerizable group into the carboxyl group or the hydroxyl group, or by reaction of the carboxyl group or the hydroxyl group with a photoacid generator. In addition, unlike PAA or PAE precursor resins that require a high curing temperature of 300 ℃ or higher to form imide bonds, high processing temperatures are not required. The temperature of the curing process for forming the cured product is characterized by being capable of being applied to a low temperature of 250 ℃ or less.
The polyamide-imide resin has a weight average molecular weight of 3000g/mol to 500,000g/mol, 5000g/mol to 300,000g/mol, or 7000g/mol to 150,000g/mol, which is preferable for forming a cured film having excellent mechanical characteristics.
Chemical formulas 1 and 2 are the same as those described above. However, more specific examples of chemical formulas 1 and 2 are as follows.
Q1And Q2May each have a divalent functional group represented by the following chemical formula 3.
[ chemical formula 3]
In chemical formula 3, L1Is a single bond, -O-, -CO-, -S-, -SO2-、-C(CH3)2-、-C(CF3)2-、-CONH-、-COO-、-(CH2)n1-、-O(CH2)n2O-、-OCH2-C(CH3)2-CH2O-or-OCO (CH)2)n3OCO-, n1, n2 and n3 each being an integer of 1 to 10, R1And R2Can be mutually connectedIdentical or different and is hydrogen, halogen, alkyl having 1 to 10 carbon atoms, hydroxy or carboxy, p and q are each R substituted in an aromatic ring1And R2And is an integer of 1 to 4, and R substituted in the aromatic ring1And R2At least one of which is hydroxyl or carboxyl.
Meanwhile, X may include a tetravalent group represented by the following chemical formula 4.
[ chemical formula 4]
In chemical formula 4, A is a single bond, -O-, -CO-, -S-, -SO2-、-C(CH3)2-、-C(CF3)2-、-CONH-、-COO-、-(CH2)n1-、-O(CH2)n2O-or-OCO (CH)2)n3OCO-, and n1, n2 and n3 are each integers of 1 to 10.
As described above, the photosensitive resin composition of the present embodiment may include a photoacid generator.
Meanwhile, the positive photoresist composition according to one embodiment of the present invention may include a photoacid generator. Examples of the photoacid generator includeSalts, e.g. iodine
In particular, the photoacid generator may be, for example, one or more selected from the group consisting of: triarylsulfonium salt and diaryliodonium
Another example of the photoacid generator may include a quinone diazide compound, a polyhydroxy compound, a polyamino compound, or a polyhydroxy polyamino compound.
Examples of the quinone diazide compound include a quinone diazide compound in which a sulfonic acid of the quinone diazide forms an ester bond with a polyhydric compound, a quinone diazide compound in which a sulfonic acid of the quinone diazide forms a sulfonamide bond with a polyhydric compound, and a quinone diazide compound in which a sulfonic acid of the quinone diazide forms an ester bond and/or a sulfonamide bond with a polyhydric compound. By using such a quinonediazide compound, a positive photosensitive resin composition having photosensitivity under i-line such as mercury lamp (wavelength of 365nm), h-line (wavelength of 405nm) or g-line (wavelength of 436nm) (general ultraviolet rays) can be obtained. Further, all functional groups of the polyhydroxy compound, polyamino compound and polyhydroxy polyamino compound are not necessarily substituted by quinonediazide, but it is preferable that two or more functional groups within one molecule are substituted by quinonediazide.
Examples of polyols include, but are not limited to, Bis-Z, BisP-EZ, TekP-4HBPA, TrisP-HAP, TrisP-PA, TrisP-SA, TrisOCR-PA, BisOCHP-Z, BisP-MZ, BisP-PZ, BisP-IPZ, BisOCP-IPZ, BisP-CP, BisRS-2P, BisRS-3P, BisP-OCHP, methylene tris-FR-CR, BisRS-26X, DML-MBPC, DML-MBOC, DML-OCHP, DML-PCHP, DML-PC, DML-PTBP, DML-34 BPA 34X, DML-EP, DML-POP, dimethylol-BisOC-P, DML-PFP, DML-PSBP, DML-MTRISML, TrisPC, TML-P, TriML-XL, TML-BPBP, TML-HQ, TML-TMP-PSBP, TMOM-BP, HML-TPPHBA and HML-TPHAP (all trade names, manufactured by Honshu Chemical IndustryCo., Ltd.); BIR-OC, BIP-PC, BIR-PTBP, BIR-PCHP, BIP-BIOC-F, 4PC, BIR-BIPC-F, TEP-BIP-A, 46DMOC, 46DMOEP and TM-BIP-A (all trade names, manufactured by Asahi Organic chemical industry Co., Ltd.); 2, 6-dimethoxymethyl-4-tert-butylphenol, 2, 6-dimethoxymethyl-p-cresol, 2, 6-diacetoxymethyl-p-cresol, naphthol, tetrahydroxybenzophenone, methyl gallate, bisphenol a, bisphenol E, methylene bisphenol and BisP-AP (all trade names, manufactured by Honshu Chemical Industry co., ltd.); and a novolac resin.
Examples of polyamino compounds include, but are not limited to, 1, 4-phenylenediamine, 1, 3-phenylenediamine, 4 '-diaminodiphenyl ether, 4' -diaminodiphenylmethane, 4 '-diaminodiphenylsulfone, and 4,4' -diaminodiphenylsulfide.
Examples of polyhydroxy polyamino compounds include, but are not limited to, 2-bis (3-amino-4-hydroxyphenyl) hexafluoropropane and 3,3' -dihydroxybenzidine.
The content of the photoacid generator may vary depending on the kind of the compound. For example, in order to exhibit a sufficient photoacid generating effect, the photoacid generator is preferably included in an amount of 0.1 parts by weight or more based on 100 parts by weight of the polyamide-imide resin. However, when an excessive amount of photoacid generator is applied to the photosensitive resin composition, the stability of the cured film may be reduced due to the photoacid generator remaining after the crosslinking reaction. Therefore, it is preferable that the photoacid generator is included in an amount of 50 parts by weight or less based on 100 parts by weight of the polyamide-imide resin.
Meanwhile, the positive photosensitive resin composition may further include an organic solvent. As the solvent, a compound known in the art to which the present invention pertains to enable the formation of a photosensitive resin composition film may be applied without particular limitation. As non-limiting examples, the solvent may be one or more compounds selected from esters, ethers, ketones, aromatic hydrocarbons, and sulfoxides.
The ester solvent may include ethyl acetate, n-butyl acetate, isobutyl acetate, amyl formate, isoamyl acetate, isobutyl acetate, butyl propionate, isopropyl butyrate, ethyl butyrate, butyl butyrate, methyl lactate, ethyl lactate, γ -butyrolactone, e-caprolactone, δ -valerolactone, alkyl glycolates (e.g., methyl glycolate, ethyl glycolate, butyl glycolate (e.g., methyl methoxyacetate, ethyl methoxyacetate, butyl methoxyacetate, methyl ethoxyacetate, ethyl ethoxyacetate, etc.)), alkyl 3-oxopropionates (e.g., methyl 3-oxopropionate, ethyl 3-oxopropionate (e.g., methyl 3-methoxypropionate, ethyl 3-methoxypropionate, methyl 3-ethoxypropionate, ethyl 3-ethoxypropionate, etc.)) Alkyl 2-oxopropionates (e.g., methyl 2-oxopropionate, ethyl 2-oxopropionate, propyl 2-oxopropionate (e.g., methyl 2-methoxypropionate, ethyl 2-methoxypropionate, propyl 2-methoxypropionate, methyl 2-ethoxypropionate, ethyl 2-ethoxypropionate)), methyl 2-oxo-2-methylpropionate, and ethyl 2-oxo-2-methylpropionate (e.g., methyl 2-methoxy-2-methylpropionate, ethyl 2-ethoxy-2-methylpropionate, etc.), methyl pyruvate, ethyl pyruvate, propyl pyruvate, methyl acetoacetate, ethyl acetoacetate, methyl 2-oxobutyrate, ethyl 2-oxobutyrate, etc.
The ether solvent may include diethylene glycol dimethyl ether, tetrahydrofuran, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, methyl cellosolve acetate, ethyl cellosolve acetate, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether acetate, propylene glycol monopropyl ether acetate, and the like.
The ketone solvent can be methyl ethyl ketone, cyclohexanone, cyclopentanone, 2-heptanone, 3-heptanone, N-methyl-2-pyrrolidone, etc.
The aromatic hydrocarbon solvent may be toluene, xylene, anisole, limonene, etc.
The sulfoxide solvent may be dimethyl sulfoxide, etc.
From the viewpoint of coatability exhibited by the photosensitive resin composition, the solvent is used in an amount of 50 to 500 parts by weight, 100 to 300 parts by weight, 100 to 250 parts by weight, or 100 to 150 parts by weight, based on 100 parts by weight of the polyamide-imide resin.
Meanwhile, according to another embodiment of the present invention, a negative-type photosensitive resin composition may be provided, which includes a polyamide-imide resin containing a repeating unit represented by the following chemical formula 11 and a repeating unit represented by the following chemical formula 12, and a photoacid generator.
[ chemical formula 11]
[ chemical formula 12]
In chemical formulas 11 and 12, Q1And Q2Each independently an aliphatic divalent functional group, a cycloaliphatic divalent functional group or an aromatic divalent functional group, or a divalent organic group comprising at least one heteroatom selected from N, O and S; q1And Q2At least one ofComprises one or more of a hydroxyl group and a carboxyl group; q1And Q2Is substituted with a functional group containing a (meth) acryloyloxy group and an alkylene group having 1 to 20 carbon atoms, or a functional group containing a (meth) acrylate group and an alkylene glycol group having 1 to 20 carbon atoms;
x is an aliphatic tetravalent organic radical, an alicyclic tetravalent organic radical or an aromatic tetravalent organic radical, or a tetravalent organic radical comprising at least one heteroatom selected from N, O and S; y is an aliphatic divalent organic radical, an alicyclic divalent organic radical or an aromatic divalent organic radical, or a divalent organic radical comprising at least one heteroatom selected from N, O and S; and n and m are each an integer of 1 or more.
As a result of continued research, the present inventors found through experiments that a photosensitive resin composition comprising a polyamide-imide resin containing a repeating unit of chemical formula 11 and a repeating unit of chemical formula 12 can be cured with high efficiency even at a relatively low temperature, and a cured material having excellent mechanical characteristics and photosensitivity can be provided, thereby completing the present invention.
Specifically, the polyamide-imide resin has an imide bond in which at least 90% of the cyclization reaction has been completed, and contains therein a functional group containing a carboxyl group or a hydroxyl group, and further contains a (meth) acryloyloxy group and an alkylene group having 1 to 20 carbon atoms, or a functional group containing a (meth) acrylate group and an alkylene glycol group having 1 to 20 carbon atoms. Generally, it is known that if an imide bond is present, the solubility is reduced and it is hardly soluble in most organic solvents. However, when a carboxyl group or a hydroxyl group is introduced into a polyamide-imide resin having a structure that is easily soluble in a polar solvent, photosensitivity may be achieved by introducing a photopolymerizable group into the carboxyl group or the hydroxyl group, or by reaction of the carboxyl group or the hydroxyl group with a photoacid generator. In addition, unlike PAA or PAE precursor resins that require a high curing temperature of 300 ℃ or higher to form imide bonds, high processing temperatures are not required. The temperature of the curing process for forming the cured product is characterized by being capable of being applied to a low temperature of 250 ℃ or less.
The polyamide-imide contains a functional group containing a (meth) acryloyloxy group and an alkylene group having 1 to 20 carbon atoms, or a functional group containing a (meth) acrylate group and an alkylene glycol group having 1 to 20 carbon atoms, and may have high mechanical and elastic properties upon final curing.
The polyamide-imide resin has a weight average molecular weight of 3000g/mol to 500,000g/mol, 5000g/mol to 300,000g/mol, or 7000g/mol to 150,000g/mol, which is preferable for forming a cured film having excellent mechanical characteristics.
Chemical formulas 11 and 12 are the same as those described above. However, more specific examples of chemical formulas 11 and 12 are as follows.
Q1And Q2May each include a divalent functional group represented by the following chemical formula 13.
[ chemical formula 13]
In chemical formula 13, L1Is a single bond, -O-, -CO-, -S-, -SO2-、-C(CH3)2-、-C(CF3)2-、-CONH-、-COO-、-(CH2)n1-、-O(CH2)n2O-、-OCH2-C(CH3)2-CH2O-or-OCO (CH)2)n3OCO-, n1, n2 and n3 each being an integer of 1 to 10, R1And R2May be the same or different from each other and is hydrogen, halogen, alkyl having 1 to 10 carbon atoms, hydroxyl or carboxyl, p and q are R substituted in the aromatic ring1And R2And is an integer of 1 to 4, R substituted in an aromatic ring1And R2At least one of which is hydroxyl or carboxyl, and R1And R2Is a functional group containing a (meth) acryloyloxy group and an alkylene group having 1 to 20 carbon atoms, or a functional group containing a (meth) acrylate group and an alkylene glycol group having 1 to 20 carbon atoms.
Specifically, a functional group including a (meth) acryloyloxy group and an alkylene group having 1 to 20 carbon atoms or a functional group including a (meth) acrylate group and an alkylene glycol group having 1 to 20 carbon atoms may be formed by reacting a hydroxyl group or a carboxyl group substituted in an aromatic ring with one of the compounds represented by the following chemical formulae 14 to 16.
[ chemical formula 14]
[ chemical formula 15]
[ chemical formula 16]
Here, X may include a tetravalent functional group of the following chemical formula 4.
[ chemical formula 4]
In chemical formula 4, A is a single bond, -O-, -CO-, -S-, -SO2-、-C(CH3)2-、-C(CF3)2-、-CONH-、-COO-、-(CH2)n1-、-O(CH2)n2O-or-OCO (CH)2)n3OCO-, and n1, n2 and n3 are each integers of 1 to 10.
The negative-type photosensitive resin composition may include a photoinitiator.
As the photoinitiator, compounds known to have a crosslinking reaction inducing effect in the technical field to which the present invention pertains may be applied without particular limitation.
By way of non-limiting example, the photoinitiator may be a compound such as: 1,3,5, 6-tetrakis (methoxymethyl) tetrahydroimidazo [4,5-d ] imidazole-2, 5(1H,3H) -dione, 1,3,5, 6-tetrakis (butoxymethyl) tetrahydroimidazo [4,5-d ] imidazole-2, 5(1H,3H) -dione, 2, 6-bis (hydroxymethyl) benzene-1, 4-diol, hexa (methoxymethyl) -1,3, 5-triazine-2, 4, 6-triamine, (propane-2, 2-diylbis (2-hydroxyphenyl-5, 3, 1-triyl)) tetramethanol, 4'- (propane-2, 2-diyl) bis (2, 6-bis (methoxymethyl) phenol), 3',5,5' -tetrakis (hydroxymethyl) - [1,1' -biphenyl ] -4,4' -diol and 3,3',5,5' -tetrakis (methoxymethyl) - [1,1' -biphenyl ] -4,4' -diol.
The photoinitiator may be included in an amount of 1 to 50 parts by weight, 5 to 40 parts by weight, or 10 to 30 parts by weight, based on 100 parts by weight of the polyamide-imide resin.
That is, in order to exhibit a sufficient photoinitiation effect, the photoinitiator is preferably contained in an amount of 1 part by weight or more based on 100 parts by weight of the polyamide-imide resin. However, when an excessive amount of photoinitiator is applied to the photosensitive resin composition, the stability of the cured film may be reduced due to the residual photoinitiator. Therefore, it is preferable that the photoinitiator is included in an amount of 50 parts by weight or less based on 100 parts by weight of the polyamide-imide resin.
Meanwhile, the negative-type photosensitive resin composition of the present embodiment may include a photosensitive compound, and specific examples of the photosensitive compound may include a photocurable multifunctional acrylic compound.
The photocurable polyfunctional acrylic compound is a compound in which at least two acrylic structures capable of being photocured are present in the molecule, and specifically, it may include an acrylate-based compound, a polyester acrylate-based compound, a urethane acrylate-based compound, an epoxy acrylate-based compound, and a caprolactone-modified acrylate-based compound.
For example, the acrylate-based compound may include: hydroxyl group-containing acrylate-based compounds such as pentaerythritol triacrylate and dipentaerythritol pentaacrylate; or water-soluble acrylate compounds such as polyethylene glycol diacrylate and polypropylene glycol diacrylate. The polyester acrylate-based compound may include trimethylolpropane triacrylate, pentaerythritol tetraacrylate, dipentaerythritol hexaacrylate, and the like. Further, the urethane acrylate-based compound may include an isocyanate-modified product of the above hydroxyl group-containing acrylate-based compound. The epoxy acrylate-based compound may include bisphenol a diglycidyl ether, hydrogenated bisphenol a diglycidyl ether, (meth) acrylic acid addition products of phenol novolac epoxy resins, and the like. The caprolactone-modified acrylate-based compound may include caprolactone-modified ditrimethylolpropane tetraacrylate, epsilon-caprolactone-modified dipentaerythritol acrylate, caprolactone-modified neopentyl glycol hydroxypivalate diacrylate, and the like.
The photocurable multifunctional acrylic compound may be included in an amount of 1 to 50 parts by weight, 5 to 40 parts by weight, or 10 to 30 parts by weight, based on 100 parts by weight of the polyamide-imide resin.
That is, in order to exhibit a sufficient crosslinking effect, the photocurable multifunctional acrylic compound is preferably contained in an amount of 1 part by weight or more based on 100 parts by weight of the polyamide-imide resin. However, when an excessive amount of the photocurable polyfunctional acrylic compound is applied to the photosensitive resin composition, low-temperature curability and photosensitivity attributable to the polyamide-imide resin may be reduced. Therefore, it is preferable that the photocurable multifunctional acrylic compound is included in an amount of 50 parts by weight or less based on 100 parts by weight of the polyamide-imide resin.
Meanwhile, the positive-type photosensitive resin composition and the negative-type photosensitive resin composition of the above embodiments may respectively selectively include an epoxy resin.
The epoxy resin can be used to exhibit high adhesive force and adhesive property of a substrate for a semiconductor device or a display device.
Such epoxy resins may include, for example, one or more selected from the group consisting of: bisphenol a-type epoxy resin, hydrogenated bisphenol a-type epoxy resin, brominated bisphenol a-type epoxy resin, bisphenol F-type epoxy resin, bisphenol S-type epoxy resin, novolac-type epoxy resin, phenol novolac-type epoxy resin, cresol novolac-type epoxy resin, N-glycidyl-type epoxy resin, bisphenol a-type novolac epoxy resin, bixylenol-type epoxy resin, biphenol-type epoxy resin, chelate-type epoxy resin, glyoxal-type epoxy resin, amino-containing epoxy resin, rubber-modified epoxy resin, dicyclopentadiene phenol epoxy resin, diglycidyl phthalate resin, heterocyclic epoxy resin, tetraglycidyl xylenol-ethane resin, silicone-modified epoxy resin, and epsilon-caprolactone-modified epoxy resin. Preferably, it may include a liquid type N-glycidyl epoxy resin.
The epoxy resin may be included in an amount of 5 parts by weight to 100 parts by weight, 10 parts by weight to 100 parts by weight, or 10 parts by weight to 75 parts by weight, based on 100 parts by weight of the polyamide-imide resin.
When an epoxy resin is used, a thermal acid generator (thermal acid generator) may be used. Examples of the thermal acid generator are not particularly limited, and compounds generally known to be useful as thermal acid generators may be used.
Meanwhile, the positive-type photosensitive resin composition and the negative-type photosensitive resin composition of the above-described embodiments may further selectively include at least one curing accelerator selected from an imidazole-based compound, a phosphine-based compound, and a tertiary amine compound, respectively.
The imidazole-based compound may be, for example, 2-phenylimidazole, 2-phenyl-4-methylimidazole or 2-phenyl-4-methyl-5-hydroxymethylimidazole. The phosphine-based compound may be, for example, triphenylphosphine, diphenylphosphine, phenylphosphine or tetraphenylphosphonium tetraphenylborate. The tertiary amine compound may be, for example, dicyandiamide, benzyldimethylamine, 4- (dimethylamino) -N, N-dimethylbenzylamine, 4-methoxy-N, N-dimethylbenzylamine or 4-methyl-N, N-dimethylbenzylamine.
Such a curing accelerator may be included in an amount of 0.1 to 10 parts by weight, based on 100 parts by weight of the polyamide-imide resin.
Meanwhile, the positive-type photosensitive resin composition and the negative-type photosensitive resin composition of the above embodiments may further optionally contain additives such as a surfactant, a coupling agent, a filler, an antioxidant, an ultraviolet absorber, an anti-agglomerating agent, a corrosion inhibitor, an antifoaming agent, an anti-gelling agent, and the like, if necessary, within a range that does not impair the above effects.
For example, as the adhesion promoter, a silane coupling agent having a functional group such as an epoxy group, a carboxyl group or an isocyanate group may be used, and specific examples thereof include trimethoxysilylbenzoic acid, triethoxysilylbenzoic acid, γ -isocyanatopropyltrimethoxysilane, γ -isocyanatopropyltriethoxysilane, γ -glycidoxypropyltrimethoxysilane, γ -glycidoxypropyltriethoxysilane, or a mixture thereof. Such an adhesion promoter may be included in an amount of 0.1 to 10 parts by weight, based on 100 parts by weight of the polyamide-imide resin.
The surfactant may be used without limitation as long as it is known to be usable for photosensitive resin compositions, but it is preferable to use a fluorine-based surfactant or a silicon-based surfactant. Such a surfactant may be included in an amount of 0.1 to 5 parts by weight, based on 100 parts by weight of the polyamide-imide resin.
According to another embodiment of the present invention, there is provided a cured film comprising a cured product of the photosensitive resin composition.
Since the photosensitive resin composition contains a polyamide-imide resin, it can be cured with high efficiency even at a temperature of 250 ℃ or less, 200 ℃ or less, or 150 ℃ to 250 ℃, and can provide a cured film having excellent mechanical characteristics even under such curing conditions.
In particular, the cured film exhibits excellent heat resistance and insulating characteristics, and thus can be preferably applied to an insulating film of a semiconductor device, an interlayer insulating film of a rewiring film, or the like. In addition, the cured film may be applied to a photoresist, an etching resist, a solder top resist, or the like.
Further, according to another embodiment of the present invention, there may be provided a method for producing a cured film, which includes a step of curing the photosensitive resin composition at a temperature of 250 ℃ or less.
As described above, the photosensitive resin composition can be cured with high efficiency even at a temperature of 250 ℃ or less, 200 ℃ or less, or 150 ℃ to 250 ℃.
More specifically, the cured film is formed by the steps of: the photosensitive resin composition is applied to a substrate, the photosensitive resin composition applied to the substrate is irradiated with an actinic ray or radiation and exposed to light, the exposed photosensitive resin composition is subjected to a developing treatment, and the developed photosensitive resin composition is heated.
Examples of the method for applying the photosensitive resin composition to a substrate include spinning, dipping, blade coating, suspension casting, coating, spraying, electrostatic spraying, and reverse roll coating. At this time, the amount of the photosensitive resin composition to be applied and the type of the substrate depend on the use and application field of the cured film. The photosensitive resin composition is preferably applied to a substrate and then dried under appropriate conditions.
In the exposure step, the photosensitive resin composition applied to the substrate is irradiated with an actinic ray or radiation in a predetermined pattern. In the step of exposure, actinic rays or radiation having a wavelength of 200nm to 600nm may be applied. As the exposure apparatus, various types of exposure apparatuses may be used, such as a mirror projection aligner, a scanner, a stepper, a proximity aligner, a contact aligner, a microlens array, a laser exposure apparatus, and a lens scanner.
In the step of performing the development treatment, the unexposed portion of the photosensitive resin composition is developed using a developing solution. As the developer, an aqueous alkaline developer, an organic solvent, or the like can be used.
According to another embodiment of the present invention, there may be provided a method for forming a resist pattern, including the steps of: forming a resist film on a substrate using the photosensitive resin composition; irradiating the resist film with a pattern using high-energy rays; and developing the resist film using an alkaline developer.
In the method for forming a resist pattern of the present embodiment, conventionally known methods for producing a cured film and methods and apparatuses for forming a resist pattern may be used without particular limitation.
Advantageous effects
According to the present invention, it is possible to provide a photosensitive resin composition which can be cured with high efficiency even at a relatively low temperature and can provide a cured material having excellent mechanical characteristics and photosensitivity, a cured film formed from the photosensitive resin composition, and a method for producing a cured film capable of providing a cured material having excellent mechanical characteristics and photosensitivity by curing the photosensitive resin composition at a relatively low temperature.
Detailed Description
The present invention will be described in more detail by the following examples. However, the following examples are provided only for illustrating the present invention, and the scope of the present invention is not limited by the following examples.
[ preparation examples ]
Preparation example 1: synthesis of Polyamide-imide resin (A1)
5g (0.0156mol) of 2,2' -bis (trifluoromethyl) benzidine, 1.904g (0.0052mol) of 2,2' -bis (3-amino-4-hydroxyphenyl) hexafluoropropane, 3.226g (0.0104mol) of 4,4' -oxydiphthalic anhydride, 2.111g (0.0104mol) of isophthaloyl dichloride and 30g N, N-dimethylacetamide were added to a 250mL round-bottomed flask equipped with a dean-Stark apparatus and a condenser, and the mixture was stirred for 3 hours in a nitrogen atmosphere to conduct polymerization.
To the polyamic acid solution obtained by polymerization were added 2.34g of acetic anhydride and 0.32g of pyridine, and the mixture was stirred in an oil bath at 60 ℃ for 18 hours to perform chemical imidization.
After the completion of the reaction, the solid content was precipitated with water and ethanol, and the precipitated solid was filtered and then dried under vacuum at 40 ℃ for 24 hours or more to obtain a polyamide-imide block copolymer having the following repeating unit (weight average molecular weight: 120,000 g/mol).
Preparation examples 2 to 4: synthesis of Polyamide-imide resins (A2 to A4)
A polyamide-imide block copolymer was obtained in the same manner as in preparation example 1, except that the ratio of the monomers used was changed as shown in table 1 below.
Preparation examples 5 to 8: synthesis of Polyamide-imide resins (B1 to B4)
To the polyamide-imide resins obtained in preparation examples 1 to 4, photocurable groups were introduced. Specifically, 4g of polyamide-imide resin from a1 to a4 was added to 16g N, N-dimethylacetamide in a 250ml round bottom flask and the mixture was stirred to completely dissolve. Then, 0.4g (0.0026mol) of 2-isocyanatoethyl methacrylate was added to the reaction solution and stirred at 50 ℃ for 4 hours to obtain polyamide-imide resins of B1 to B4.
Comparative preparation example 1: synthesis of polyimide resin (C1)
7.618g (0.0208mol) of 2,2 '-bis (3-amino-4-hydroxyphenyl) hexafluoropropane, 9.24g (0.0208mol) of 4,4' - (hexafluoropropylidene) diphthalic anhydride, 0.131g (0.0008mol) of nadic phthalic anhydride and 40g N, N-dimethylacetamide were added to a 250mL round-bottomed flask equipped with a dean-Stark apparatus and a condenser, and the mixture was stirred under a nitrogen atmosphere for 4 hours to effect polymerization.
To the polyamic acid solution obtained by polymerization were added 2.34g of acetic anhydride and 0.g of pyridine, and the mixture was stirred in an oil bath at 60 ℃ for 18 hours to perform chemical imidization.
After the completion of the reaction, the solid content was precipitated with water and ethanol, and the precipitated solid was filtered and then dried under vacuum at 40 ℃ for 24 hours or more to obtain a polyimide resin having the following repeating unit (weight average molecular weight: 55,000 g/mol).
Comparative preparation example 2: synthesis of polyimide resin (C2)
By using the polyimide resin obtained in comparative preparation example 1, a polyimide resin was obtained in the same manner as in preparation example 5.
Comparative preparation example 3: synthesis of Polyamide-imide resin (C3)
A polyamide-imide resin was obtained in the same manner as in preparation example 1, except that the ratio of the monomers used was changed as shown in table 1 below.
Comparative preparation example 4: synthesis of Polyamide-imide resin (C4)
By using the polyamide-imide resin obtained in comparative preparation example 3, a polyamide-imide resin was obtained in the same manner as in preparation example 5.
[ Table 1]
TFMB: 2,2' -bis (trifluoromethyl) benzidine BisAPAF: 2,2' -bis (3-amino-4-hydroxyphenyl) hexafluoropropane
ODPA: 4,4' -oxydiphthalic anhydride
IPDC: isophthaloyl dichloride
MOI：Karenz MOITM
NDA: nadic phthalic anhydride
Examples 1 to 4: preparation of Positive photosensitive resin composition
To 3g of each of the polyamide-imide resins synthesized in preparation examples 1 to 4 were added 0.3g of diazonaphthoquinone ester compound (TPD 520) and 4.5g of solvent N-methyl-2-pyrrolidone (NMP), and the mixture was stirred at room temperature for 4 hours and then filtered through a filter having a pore size of 5 μm to prepare a photosensitive resin composition.
Examples 5 to 8: preparation of Positive photosensitive resin composition
To 3g of each of the polyamide-imide resins synthesized in preparation examples 1 to 4 were added 0.6g of diazonaphthoquinone ester compound (TPD 520) and 4.5g of solvent N-methyl-2-pyrrolidone (NMP), and the mixture was stirred at room temperature for 4 hours and then filtered through a filter having a pore size of 5 μm to prepare a photosensitive resin composition.
Comparative examples 1 and 2: preparation of Positive photosensitive resin composition
To 3g of the polyimide resin synthesized in comparative preparation example 1 and 3g of the polyamide-imide resin synthesized in comparative preparation example 3 were added 0.3g of diazonaphthoquinone ester compound (TPD 520) and 4.5g of solvent N-methyl-2-pyrrolidone (NMP), respectively, and the mixture was stirred at room temperature for 4 hours and then filtered through a filter having a pore size of 5 μm to prepare a photosensitive resin composition.
Comparative examples 3 and 4: preparation of Positive photosensitive resin composition
To 3g of the polyimide resin synthesized in comparative preparation example 1 and 3g of the polyamide-imide resin synthesized in comparative preparation example 3 were added 0.6g of diazonaphthoquinone ester compound (TPD 520) and 4.5g of solvent N-methyl-2-pyrrolidone (NMP), respectively, and the mixture was stirred at room temperature for 4 hours and then filtered through a filter having a pore size of 5 μm to prepare a photosensitive resin composition.
Comparative examples 9 to 12: preparation of negative-type photosensitive resin composition
To 3g of each of the polyamide-imide resins synthesized in comparative preparation examples 5 to 8 were added 0.03g of a photopolymerization initiator OXE-01 based on an oxime ester, 0.45g of polyethylene glycol di (meth) acrylate, 0.3g of propylene glycol diglycidyl ether, and 4.5g of N-methyl-2-pyrrolidone (NMP) as a solvent, and the mixture was stirred at room temperature for 4 hours and then filtered through a filter having a pore size of 5 μm to prepare a photosensitive resin composition.
Comparative examples 13 to 16: preparation of negative-type photosensitive resin composition
To 3g of each of the polyamide-imide resins synthesized in comparative preparation examples 5 to 8 were added 0.03g of a photopolymerization initiator OXE-01 based on an oxime ester, 0.9g of polyethylene glycol di (meth) acrylate, 0.3g of propylene glycol diglycidyl ether, and 4.5g of N-methyl-2-pyrrolidone (NMP) as a solvent, and the mixture was stirred at room temperature for 4 hours and then filtered through a filter having a pore size of 5 μm to prepare a photosensitive resin composition.
Comparative examples 5 to 6: preparation of negative-type photosensitive resin composition
To 3g of the polyimide resin synthesized in comparative preparation example 2 and 3g of the polyamide-imide resin synthesized in comparative preparation example 4 were added 0.03g of a photopolymerization initiator OXE-01 based on an oxime ester, 0.45g of polyethylene glycol di (meth) acrylate, 0.3g of propylene glycol diglycidyl ether, and 4.5g of a solvent N-methyl-2-pyrrolidone (NMP), respectively, and the mixture was stirred at room temperature for 4 hours and then filtered through a filter having a pore size of 5 μm to prepare a photosensitive resin composition.
Comparative examples 7 and 8: preparation of negative-type photosensitive resin composition
To 3g of the polyimide resin synthesized in comparative preparation example 2 and 3g of the polyamide-imide resin synthesized in comparative preparation example 4 were added 0.03g of a photopolymerization initiator OXE-01 based on an oxime ester, 0.9g of polyethylene glycol di (meth) acrylate, 0.3g of propylene glycol diglycidyl ether, and 4.5g of a solvent N-methyl-2-pyrrolidone (NMP), respectively, and the mixture was stirred at room temperature for 4 hours and then filtered through a filter having a pore size of 5 μm to prepare a photosensitive resin composition.
Test example 1: method for evaluating sensitivity
The photosensitive resin compositions prepared in examples and comparative examples were spin-coated on a 4-inch silicon wafer, and then heated on a hot plate at 120 ℃ for 2 minutes, thereby forming a photosensitive resin film having a thickness of 15 μm. The silicon wafer having the photosensitive resin film formed therein was subjected to an i-line stepper (Nikon NSR 1505 i5A) at 30mJ/cm2To 40mJ/cm2Are sequentially exposed to 990mJ/cm2. After development in a 2.38% by weight aqueous tetramethylammonium solution (NEPES, CPD-18) at 23 ℃ for 90 seconds, it was washed with ultrapure water for 60 seconds and dried in air.
At this time, in the case of a positive type composition, the exposure amount at which the exposed portion is not completely eluted and lost (also referred to as the minimum exposure amount Eth) is taken as the sensitivity.
On the other hand, in the case of the negative type composition, the exposure amount at which the unexposed portion is completely eluted and lost is taken as the sensitivity. The results are shown in tables 2 and 3 below.
Test example 2: method for measuring alkaline development speed
The photosensitive resin compositions prepared in examples and comparative examples were spin-coated on a 4-inch silicon wafer, and then heated on a hot plate at 120 ℃ for 2 minutes, thereby forming a photosensitive resin film having a thickness of 15 μm. The number of revolutions of spin coating was adjusted so that the thickness of the resin film became 15 μm. The resin film was developed in a 2.38 wt% aqueous tetramethylammonium solution (NEPES, CPD-18) at 23 ℃ for 1 minute, then washed with ultrapure water for 60 seconds and dried in air. The film thickness after drying was measured, and the amount of decrease in film thickness per minute was calculated. These results are shown in tables 2 and 3 below.
Test example 3: method for measuring physical properties of resin cured film
The photosensitive resin compositions prepared in examples and comparative examples were spin-coated on a 4-inch silicon wafer, and then heated on a hot plate at 120 ℃ for 2 minutes, thereby forming a photosensitive resin film having a thickness of 15 μm. The number of revolutions of spin coating was adjusted so that the thickness of the resin film became 15 μm. The silicon wafer coated with the resin film was heated at a temperature of 25 ℃ to 200 ℃ for 1 hour in a nitrogen atmosphere, and then the temperature was maintained at 200 ℃ for 1 hour to obtain a cured film. Then, the cured film was peeled off using a hydrofluoric acid aqueous solution, washed with water, and dried. The peeled film was cut into a size of 1cm in width and 8cm in length, and then the tensile characteristics were measured. The results are shown in tables 2 and 3 below.
[ Table 2]
[ Table 3]
(Compounds used)
Diazonaphthoquinone compound: TPD 520/Miwon Specialty Chemical Co., Ltd.
Photoinitiator compound (b): OXE-01/BASF
Photocurable acrylic compounds: polyethylene glycol di (meth) acrylate/Sigma-Aldrich
Curing agent: propylene glycol diglycidyl ether (trade name, Eplight-70P)/Kyoeisha Chemical Co., Ltd.
Solvent: N-methyl-2-pyrrolidone/Sigma-Aldrich
As shown in tables 2 and 3, it was confirmed that when the compositions of examples were used, high sensitivity and alkaline development speed could be simultaneously achieved, and high elongation could be ensured while maintaining the tensile strength and modulus of the finally obtained cured film at high levels.
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