阅读说明：本技术 碱溶性树脂 (Alkali soluble resin ) 是由 六人部壮 伏木将人 于 2018-04-17 设计创作，主要内容包括：本发明提供适合用于获得高溶解性、高灵敏度、高耐热透明性、高耐溶剂性的碱溶型放射线敏感性树脂组合物的碱溶性树脂。本发明涉及由下述式(1)表示的含不饱和基团的碱溶性树脂。(式中,A相互独立地为-CO-、-SO<Sub>2</Sub>-、-C(CF<Sub>3</Sub>)<Sub>2</Sub>-、-Si(CH<Sub>3</Sub>)<Sub>2</Sub>-、-CH<Sub>2</Sub>-、-C(CH<Sub>3</Sub>)<Sub>2</Sub>-、-O-、4,4-亚环己基或单键,B为具有脂环式骨架的四羧酸的残基,G为氢原子或-CO-X-(COOH)<Sub>x</Sub>(X表示2～4元的多元羧酸的残基,x表示1～3的整数)。R<Sub>1</Sub>相互独立地为氢原子或甲基,R<Sub>2</Sub>相互独立地为碳原子数1～5的烷基或卤素基团。k为0～10,n为0～4,m为1～50的整数。)[化1]<Image he="105" wi="700" file="DDA0002244175980000011.GIF" imgContent="drawing" imgFormat="GIF" orientation="portrait" inline="no"></Image>(The present invention provides an alkali-soluble resin suitable for obtaining an alkali-soluble radiation-sensitive resin composition having high solubility, high sensitivity, high heat-resistant transparency, and high solvent resistance. The present invention relates to an unsaturated group-containing alkali-soluble resin represented by the following formula (1). (wherein A is independently-CO-, -SO2-, -C (CF3)2-, -Si (CH3)2-, -CH2-, -C (CH3)2-, -O-, 4-cyclohexylene or a single bond, B is a residue of a tetracarboxylic acid having an alicyclic skeleton, G is a hydrogen atom or-CO-X- (COOH) X (X represents a residue of a 2-to 4-membered polycarboxylic acid, and X represents an integer of 1 to 3), R1 is independently a hydrogen atom or a methyl group, R2 is independently an alkyl group having 1 to 5 carbon atoms or a halogen group, k is 0 to 10, n is 0 to 4, and m is an integer of 1 to 50) ] [ 1])

1. An unsaturated group-containing alkali-soluble resin represented by the following formula (1),

[ solution 1]

Wherein A is independently-CO-, -SO2-, -C (CF3)2-, -Si (CH3)2-, -CH2-, -C (CH3)2-, -O-, 4-cyclohexylene or a single bond, B is a residue of a tetracarboxylic acid having an alicyclic skeleton, G is a hydrogen atom or-CO-X- (COOH) X, wherein X represents a residue of a 2-to 4-membered polycarboxylic acid, and X represents an integer of 1 to 3; r1 are independently hydrogen atoms or methyl, R2 are independently alkyl groups having 1-5 carbon atoms or halogen groups; k is 0 to 10, n is 0 to 4, and m is an integer of 1 to 50.

2. An unsaturated group-containing alkali-soluble resin represented by the following formula (2),

[ solution 2]

Wherein A is independently-CO-, -SO2-, -C (CF3)2-, -Si (CH3)2-, -CH2-, -C (CH3)2-, -O-, 4-cyclohexylene or a single bond, B is a residue of a tetracarboxylic acid having an alicyclic skeleton, J represents a hydrogen atom, -CO-X- (COOH) X or-CO-B (COOH)2-COO-K, wherein X is a residue of a 2-to 4-membered polycarboxylic acid, X is an integer of 1 to 3, and K is a residue of a (meth) acrylate monomer having a hydroxyl group; r1 independently represent a hydrogen atom or a methyl group, R2 independently represent an alkyl group having 1 to 5 carbon atoms or a halogen group; k is 0 to 10, n is 0 to 4, and m is an integer of 2 to 50.

3. The unsaturated group-containing alkali-soluble resin according to claim 1 or 2, wherein A is-C (CH3)2-, -CH2-, or a direct bond.

4. The unsaturated group-containing alkali-soluble resin according to any one of claims 1 to 3, wherein the acrylic acid equivalent is 350g/eq or less.

5. An alkali-soluble radiation-sensitive resin composition comprising the unsaturated group-containing alkali-soluble resin according to any one of claims 1 to 4, a photopolymerizable monomer and/or oligomer, a photopolymerization initiator, and a solvent.

6. The alkali-soluble radiation-sensitive resin composition according to claim 5, further comprising a pigment.

7. A cured film obtained by curing the alkali-soluble radiation-sensitive resin composition according to claim 5 or 6.

8. A color filter comprising the cured film of claim 7.

Technical Field

The present invention relates to an alkali-soluble resin and an alkali-soluble radiation-sensitive resin composition containing the resin.

Background

Radiation-sensitive resin compositions are widely used as materials for forming permanent films, such as resist materials for forming ITO electrodes of Liquid Crystal Displays (LCDs), organic EL displays, and the like, interlayer insulating films, circuit protective films, colored pigment-dispersed resists for manufacturing color filters of liquid crystal displays, and spacer materials for organic EL displays. Among them, in recent years, there has been an increasing demand for liquid crystal displays for television applications and the like, and radiation-sensitive resin compositions are frequently used in the production processes thereof.

For color filter applications, an alkali-soluble resin having high solubility, high sensitivity, high heat-resistant transparency, and high solvent resistance is required. As the alkali-soluble resin, for example, patent documents 1 and 2 propose a photosensitive resin composition for a black resist using a resin obtained by further reacting a reaction product of an epoxy compound having a fluorene skeleton and (meth) acrylic acid with a polybasic acid carboxylic acid or an acid anhydride thereof. However, it is difficult for the composition to satisfy these required characteristics at the same time.

Disclosure of Invention

Problems to be solved by the invention

The purpose of the present invention is to provide an alkali-soluble resin suitable for obtaining an alkali-soluble radiation-sensitive resin composition having high solubility, high sensitivity, high heat-resistant transparency, and high solvent resistance.

Means for solving the problems

The present inventors have conducted extensive studies to solve the above problems, and as a result, they have found that if a resin is obtained by modifying an epoxy (meth) acrylate derived from a bisphenol having two aromatic rings with a tetracarboxylic acid having an alicyclic skeleton or an acid dianhydride thereof and adjusting the acrylic acid equivalent weight and the molecular weight, the above-mentioned required characteristics are satisfied at the same time, and have completed the present invention.

That is, the present invention relates to an unsaturated group-containing alkali-soluble resin represented by the following formula (1).

[ solution 1]

(wherein A is independently-CO-, -SO2-, -C (CF3)2-, -Si (CH3)2-, -CH2-, -C (CH3)2-, -O-, 4-cyclohexylene or a single bond, B is a residue of a tetracarboxylic acid having an alicyclic skeleton, G is a hydrogen atom or-CO-X- (COOH) X (X represents a residue of a 2-to 4-membered polycarboxylic acid, and X represents an integer of 1 to 3.) R1 is independently a hydrogen atom or a methyl group, R2 is independently an alkyl group having 1 to 5 carbon atoms or a halogen group, k is 0 to 10, n is 0 to 4, and m is an integer of 1 to 50.)

In addition, the present invention relates to an unsaturated group-containing alkali-soluble resin represented by the following formula (2).

[ solution 2]

(wherein A is independently-CO-, -SO2-, -C (CF3)2-, -Si (CH3)2-, -CH2-, -C (CH3)2-, -O-, 4-cyclohexylene or a single bond, B is a residue of a tetracarboxylic acid having an alicyclic skeleton, J is a hydrogen atom, -CO-X- (COOH) X (X is a residue of a 2-to 4-membered polycarboxylic acid, and X is an integer of 1 to 3) or-CO-B (COOH)2-COO-K, K is a residue of a (meth) acrylate monomer having a hydroxyl group, R1 is independently a hydrogen atom or a methyl group, R2 is independently an alkyl group having 1 to 5 carbon atoms or a halogen group, K is 0 to 10, n is 0 to 4, and m is an integer of 2 to 50).

A is preferably-C (CH3)2-, -CH 2-or a direct bond.

The acrylic acid equivalent is preferably 350g/eq or less.

Further, the present invention relates to an alkali-soluble radiation-sensitive resin composition comprising the above-mentioned unsaturated group-containing alkali-soluble resin, a photopolymerizable monomer and/or oligomer, a photopolymerization initiator, and a solvent.

The alkali-soluble radiation-sensitive resin composition preferably further contains a pigment.

The present invention also relates to a cured film obtained by curing the alkali-soluble radiation-sensitive resin composition, and a color filter comprising the cured film.

Effects of the invention

The alkali-soluble resin of the present invention is obtained by reacting an epoxy (meth) acrylate derived from a bisphenol having two aromatic rings, a tetracarboxylic acid having an alicyclic skeleton or an acid dianhydride thereof, and if necessary, a dicarboxylic acid or an acid anhydride thereof, and/or a (meth) acrylate monomer having a hydroxyl group, and therefore, compared with conventional fluorene-based resins and polyphenol-based resins, the alkali-soluble resin is excellent in high sensitivity, high heat-resistant transparency, high solvent resistance, and high solubility, and can be suitably used for color filter applications.

Detailed Description

< first alkali-soluble resin of the present invention >

The first unsaturated group-containing alkali-soluble resin of the present invention is characterized by being represented by the following formula (1).

[ solution 3]

(wherein A is independently-CO-, -SO2-, -C (CF3)2-, -Si (CH3)2-, -CH2-, -C (CH3)2-, -O-, 4-cyclohexylene or a single bond, B is a residue of a tetracarboxylic acid having an alicyclic skeleton, G is a hydrogen atom or-CO-X- (COOH) X (X represents a residue of a 2-to 4-membered polycarboxylic acid, and X represents an integer of 1 to 3.) R1 is independently a hydrogen atom or a methyl group, R2 is independently an alkyl group having 1 to 5 carbon atoms or a halogen group, k is 0 to 10, n is 0 to 4, and m is an integer of 1 to 50.)

Here, a is preferably — C (CH3)2-, -CH2-, or a direct bond, from the viewpoint of alkali solubility and excellent sensitivity. In view of excellent heat resistance and transparency, B is preferably a residue of a tetracarboxylic acid having a cyclohexane skeleton, a cycloheptane skeleton or a norbornane skeleton. G is preferably a hydrogen atom from the viewpoint of excellent heat-resistant transparency and less film shrinkage during curing. Further, k is preferably an integer of 0 to 7, n is preferably an integer of 0 to 2, and m is preferably an integer of 1 to 30.

The first unsaturated group-containing alkali-soluble resin of the present invention is obtained by reacting (a) an epoxy (meth) acrylate derived from a bisphenol having two aromatic rings, (b) a tetracarboxylic acid having an alicyclic skeleton or an anhydride thereof, and, as required, (c) a dicarboxylic acid or an anhydride thereof. When component (c) is reacted, G in the general formula (1) is-CO-X- (COOH) X.

< epoxy (meth) acrylate >

By reacting an epoxy (meth) acrylate (a) derived from a bisphenol having two aromatic rings, the solubility is high, the sensitivity is high, and the cured film exhibits high solvent resistance. The epoxy (meth) acrylate (a) is a compound having a structure in which A connecting two hydroxyphenyl groups is-CO-, -SO2-, -C (CF3)2-, -Si (CH3)2-, -CH2-, -C (CH3)2-, -O-, 4-cyclohexylene or a single bond. Such a compound is not particularly limited, and examples thereof include: bisphenol skeleton-containing epoxy (meth) acrylates such as bisphenol a epoxy (meth) acrylate, bisphenol AP epoxy (meth) acrylate, and bisphenol F epoxy (meth) acrylate, and bisphenol skeleton-containing epoxy (meth) acrylates. These may be used alone or in combination of two or more.

In the present specification, the (meth) acrylate refers to an ester of (meth) acrylic acid with a hydroxyl group-containing compound or an epoxy group-containing compound. In the present specification, (meth) acrylic acid means acrylic acid or methacrylic acid.

The number of hydroxyl groups of the epoxy (meth) acrylate (a) is not particularly limited, and is preferably 2 to 5, more preferably 2 in one molecule. The number of carbon-carbon double bonds (C ═ C bonds) in the (meth) acrylate is not particularly limited, but is preferably 1 to 4, more preferably 1 to 2 per molecule.

[ b ] tetracarboxylic acid having alicyclic skeleton or acid anhydride thereof >

The cured film exhibits heat-resistant transparency by reacting a tetracarboxylic acid having an alicyclic skeleton or an acid anhydride thereof (b). The tetracarboxylic acid or its anhydride (b) is not particularly limited as long as it has an alicyclic skeleton, and a known compound can be used. Examples of the alicyclic skeleton include: a cyclobutane skeleton, a cyclopentane skeleton, a cyclohexane skeleton, a cycloheptane skeleton, a norbornane skeleton, and the like. Specific examples of the compound include: cyclobutanetetracarboxylic acid or anhydride thereof, cyclopentane tetracarboxylic acid or anhydride thereof, cyclohexane tetracarboxylic acid or anhydride thereof, cycloheptane tetracarboxylic acid or anhydride thereof, norbornane tetracarboxylic acid or anhydride thereof, and the like.

A tetracarboxylic acid having no alicyclic skeleton or an acid anhydride thereof may be used in combination within a range not impairing the effects of the present invention. Examples of the tetracarboxylic acid having no alicyclic skeleton or an acid anhydride thereof include: aliphatic tetracarboxylic acids such as vinyltetracarboxylic acid and butanetetracarboxylic acid, aromatic tetracarboxylic acids such as benzenetetracarboxylic acid, benzophenonetetracarboxylic acid, biphenyltetracarboxylic acid and biphenyl ether tetracarboxylic acid, and acid anhydrides thereof. When a tetracarboxylic acid having no alicyclic skeleton or an acid anhydride thereof is used in combination, the tetracarboxylic acid having an alicyclic skeleton or an acid anhydride thereof is used preferably in an amount of 70 mol% or more, more preferably 80 mol% or more, further preferably 90 mol% or more, and most preferably 95% or more.

< C > dicarboxylic acid or anhydride thereof

By reacting the dicarboxylic acid or its anhydride (c), the alkali solubility is increased. The dicarboxylic acid or its anhydride (c) is not particularly limited, and examples thereof include: maleic acid, succinic acid, itaconic acid, phthalic acid, tetrahydrophthalic acid, hexahydrophthalic acid, methylendomethylenetetrahydrophthalic acid, chlorendic acid, methyltetrahydrophthalic acid, succinic acid, glutaric acid, trimellitic acid, and anhydrides thereof. Among them, dicarboxylic acids having an alicyclic skeleton and anhydrides thereof are preferable, and tetrahydrophthalic acid, hexahydrophthalic acid, or anhydrides thereof are more preferable. These may be used alone or in combination of two or more.

The amount of each component used is not particularly limited, but it is advantageous to carry out the reaction in a proportion of usually 30 to 100 parts by mole, preferably 50 parts by mole or more and less than 100 parts by mole, in terms of an acid anhydride group, of the component (b) with respect to 100 parts by mole of the hydroxyl group of the component (a). The anhydride group is understood to mean a-CO-O-CO-group, defined as the two carboxyl groups of the tetracarboxylic acid corresponding to one anhydride group. When the amount is less than 30 parts by mole, the molecular weight cannot be sufficiently increased, which causes deterioration of solvent resistance; even if the amount exceeds 100 parts by mole, not only the increase in molecular weight is not obtained, but also unreacted materials remain, which causes deterioration of developability. When the component (c) is reacted, the ratio of the component (b) to the component (c) is preferably 99: 1-10: 90, more preferably 95: 5-20: 80. (c) when the molar ratio of the components is less than 1, the alkali solubility may be insufficient. When the molar ratio of the component (c) exceeds 90, the molecular weight is small, and thus there may be a problem that the adhesion of the coating film remains after the prebaking.

The reaction temperature is not particularly limited, but is preferably 80 to 130 ℃ and more preferably 90 to 110 ℃. When the reaction temperature is lower than 80 ℃, the reaction may not proceed smoothly and unreacted materials may remain; above 130 ℃ a sharp increase in molecular weight results. The reaction time is not particularly limited, but is preferably 2 to 24 hours, and more preferably 4 to 20 hours. When the reaction time is less than 2 hours, the reaction may not proceed sufficiently, and unreacted materials may remain; over 24 hours, a sharp increase in molecular weight results.

If necessary, the reaction may be carried out in the presence of a solvent, a catalyst, or the like. In this reaction, other monomers may be optionally reacted. The other monomer is not particularly limited, and examples thereof include: polyols, epoxy compounds, isocyanate compounds, silane coupling agents, and the like. These may be used alone or in combination of two or more.

< second alkali-soluble resin of the present invention >

The second alkali-soluble resin of the present invention is represented by the following formula (2).

[ solution 4]

(wherein A is independently-CO-, -SO2-, -C (CF3)2-, -Si (CH3)2-, -CH2-, -C (CH3)2-, -O-, 4-cyclohexylene or a single bond, B is a residue of a tetracarboxylic acid having an alicyclic skeleton, J is a hydrogen atom, -CO-X- (COOH) X (X is a residue of a 2-to 4-membered polycarboxylic acid, and X is an integer of 1 to 3) or-CO-B (COOH)2-COO-K, K is a residue of a (meth) acrylate monomer having a hydroxyl group, R1 is independently a hydrogen atom or a methyl group, R2 is independently an alkyl group having 1 to 5 carbon atoms or a halogen group, K is 0 to 10, n is 0 to 4, and m is an integer of 2 to 50).

Here, a is preferably — C (CH3)2-, -CH2-, or a direct bond, from the viewpoint of alkali solubility and excellent sensitivity. In view of excellent heat resistance and transparency, B is preferably a residue of a tetracarboxylic acid having a cyclohexane skeleton, a cycloheptane skeleton or a norbornane skeleton. J is preferably a hydrogen atom from the viewpoint of excellent heat-resistant transparency and less film shrinkage during curing, and is preferably-CO-B (COOH)2-COO-K from the viewpoint of high sensitivity and excellent solvent resistance of the cured film. Further, k is preferably an integer of 0 to 7, n is preferably an integer of 0 to 2, and m is preferably an integer of 1 to 30.

The second unsaturated group-containing alkali-soluble resin of the present invention is obtained by reacting (d) a (meth) acrylate monomer having a hydroxyl group with the first unsaturated group-containing alkali-soluble resin of the present invention. When the component (d) is reacted, the residue obtained by removing one hydroxyl group from the component (d) is K in the general formula (2).

(d) a (meth) acrylate monomer having a hydroxyl group

By reacting the (meth) acrylate monomer (d) having a hydroxyl group, an unsaturated group-containing alkali-soluble resin having a reduced acrylic equivalent weight and high sensitivity can be produced, and the solvent resistance of the cured film can be improved. The (meth) acrylate monomer is not particularly limited, and examples thereof include: (meth) acrylate monomers having no cyclic structure such as 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, trimethylolpropane di (meth) acrylate, trimethylolpropane mono (meth) acrylate, trimethylolethane di (meth) acrylate, trimethylolethane mono (meth) acrylate, pentaerythritol di (meth) acrylate, pentaerythritol tri (meth) acrylate, dipentaerythritol mono (meth) acrylate, dipentaerythritol di (meth) acrylate, dipentaerythritol tri (meth) acrylate, dipentaerythritol tetra (meth) acrylate, dipentaerythritol penta (meth) acrylate, glycerol (meth) acrylate, and the like, And (meth) acrylate monomers having a cyclic structure such as ethylene oxide isocyanurate-modified di (meth) acrylate and 2-hydroxy-3-phenoxypropyl acrylate, dendrimer-type acrylate, and hyperbranched-type acrylate. These may be used alone or in combination of two or more. Among these, a (meth) acrylate monomer having no cyclic structure, a dendrimer-type acrylate, and a hyperbranched-type acrylate are preferably used.

The number of hydroxyl groups of the (meth) acrylate monomer (d) having a hydroxyl group is not particularly limited, and is preferably 1 to 5, more preferably 1, in one molecule. The number of carbon-carbon double bonds (C ═ C bonds) is also not particularly limited, and is preferably 1 to 5, more preferably 3 to 5, per molecule.

(d) The amount of the component (d) is not particularly limited, and is preferably 1 to 60 parts by mole, more preferably 3 to 30 parts by mole, based on 100 parts by mole of the hydroxyl group of the component (a). (d) When the hydroxyl group content of the component (B) is less than 1 part by mole, the solvent resistance of the cured film may not be sufficiently improved; when the amount exceeds 60 mol, the developability is deteriorated.

The acid value of the alkali-soluble resin of the present invention is not particularly limited, and is preferably 30 to 140mgKOH/g, and more preferably 50 to 130 mgKOH/g. When the acid value is less than 30mgKOH/g, not only the solubility of the unexposed portion in a developer is lowered and the time required for development is increased, but also a desired pattern may not be obtained; when the content exceeds 140mgKOH/g, the solubility of the unexposed portion in the developer becomes too high, and thus the development latitude cannot be obtained, and the desired pattern may not be obtained.

The acrylic equivalent of the alkali-soluble resin of the present invention is not particularly limited, but is preferably 350g/eq or less, and more preferably 340g/eq or less. When the acrylic acid equivalent exceeds 350g/eq, the sensitivity is lowered and the solvent resistance is sometimes deteriorated. The "acrylic equivalent" referred to in the present specification means a theoretical value calculated from the charged amount of raw materials used in the synthesis of the resin, and can be obtained by dividing the weight of the resin by the number of (meth) acryloyl groups present in the resin, and corresponds to the reciprocal of the weight of the resin per 1 mole of (meth) acryloyl groups, that is, the concentration of (meth) acryloyl groups.

The weight average molecular weight of the alkali-soluble resin of the present invention is not particularly limited, but is preferably 1000 to 50000, more preferably 1000 to 20000, and further preferably 1000 to 15000. When the weight average molecular weight is less than 1000, there may be a problem of residual adhesion of the coating film after the prebaking; if the amount exceeds 50000, the viscosity of the resin increases, the workability deteriorates, and the unexposed portion becomes insoluble in a developing solution, so that the desired pattern may not be obtained.

< alkali-soluble radiation-sensitive resin composition >

The alkali-soluble radiation-sensitive resin composition of the present invention is characterized by containing the above-mentioned unsaturated group-containing alkali-soluble resin, a photopolymerizable monomer and/or oligomer, a photopolymerization initiator, and a solvent. Preferably further comprising a pigment. Here, the radiation sensitivity refers to a property of causing a chemical reaction under various types of radiation, and examples of such radiation include, in order from radiation having a relatively long wavelength: visible rays, ultraviolet rays, electron rays, X rays, alpha rays, beta rays, and gamma rays. Among them, ultraviolet rays are the most practically preferable radiation from the viewpoint of economy and efficiency. As the ultraviolet light, ultraviolet light emitted by lamp oscillation such as a low-pressure mercury lamp, a high-pressure mercury lamp, an ultra-high pressure mercury lamp, an arc lamp, and a xenon lamp can be preferably used. Radiation having a wavelength shorter than that of ultraviolet rays has high chemical reactivity and is theoretically superior to ultraviolet rays, but ultraviolet rays are practically used from the viewpoint of economy.

The photopolymerizable monomer and/or oligomer is not particularly limited, and examples thereof include: 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, ethylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, triethylene glycol di (meth) acrylate, tetraethylene glycol di (meth) acrylate, butanediol di (meth) acrylate, trimethylolpropane tri (meth) acrylate, trimethylolpropane di (meth) acrylate, trimethylolpropane mono (meth) acrylate, trimethylolethane tri (meth) acrylate, trimethylolethane di (meth) acrylate, trimethylolethane mono (meth) acrylate, pentaerythritol di (meth) acrylate, pentaerythritol tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, and mixtures thereof, Pentaerythritol tetra (meth) acrylate, dipentaerythritol mono (meth) acrylate, dipentaerythritol di (meth) acrylate, dipentaerythritol tri (meth) acrylate, dipentaerythritol tetra (meth) acrylate, dipentaerythritol penta (meth) acrylate, dipentaerythritol hexa (meth) acrylate, glycerin (meth) acrylate, and the like. These may be used alone or in combination of two or more.

The content of the photopolymerizable monomer and/or oligomer is not particularly limited, but is preferably 50 parts by weight or less, more preferably 40 parts by weight or less, and still more preferably 10 parts by weight or less, based on 100 parts by weight of the unsaturated group-containing alkali-soluble resin. When the content exceeds 50 parts by weight, there may be a problem in adhesion after prebaking.

The photopolymerization initiator is not particularly limited, and examples thereof include: acetophenones such as acetophenone, 2-diethoxyacetophenone, p-dimethylacetophenone, p-dimethylaminopropiophenone, dichloroacetophenone, trichloroacetophenone and p-tert-butyl acetophenone; benzophenones such as benzophenone, 2-chlorobenzophenone, p' -bisdimethylaminobenzophenone; benzoin ethers such as benzoin, benzoin methyl ether, benzoin isopropyl ether, and benzoin isobutyl ether; sulfur compounds such as benzoin dimethyl ether, thioxanthene, 2-chlorothioxanthene, 2, 4-diethylthioxanthene, 2-methylthioxanthene, and 2-isopropylthioxanthene; anthraquinones such as 2-ethylanthraquinone, octamethylanthraquinone, 1, 2-benzoanthraquinone, and 2, 3-diphenylanthraquinone; organic peroxides such as azobisisobutyronitrile, benzoyl peroxide, cumene peroxide and the like; and thiol compounds such as 2-mercaptobenzimidazole, 2-mercaptobenzoxazole and 2-mercaptobenzothiazole. These may be used alone or in combination of two or more.

The content of the photopolymerization initiator is not particularly limited, and is preferably 0.1 to 30 parts by weight, more preferably 1 to 20 parts by weight, based on 100 parts by weight of the unsaturated group-containing alkali-soluble resin. When the content is less than 0.1 part by weight, the photopolymerization rate becomes slow and the sensitivity sometimes decreases; when the amount exceeds 30 parts by weight, the light hardly reaches the substrate, and thus the adhesion between the substrate and the resin may be deteriorated.

The solvent is not particularly limited, and examples thereof include: alcohols such as methanol and ethanol; ethers such as tetrahydrofuran; glycol ethers such as ethylene glycol monomethyl ether, ethylene glycol dimethyl ether, ethylene glycol methyl ethyl ether, and ethylene glycol monoethyl ether; ethylene glycol alkyl ether acetates such as methyl cellosolve acetate and ethyl cellosolve acetate; diethylene glycols such as diethylene glycol monomethyl ether, diethylene glycol diethyl ether, diethylene glycol dimethyl ether, diethylene glycol ethyl methyl ether, diethylene glycol monoethyl ether, and diethylene glycol monobutyl ether; propylene glycol alkyl ether acetates such as propylene glycol methyl ether acetate and propylene glycol ethyl ether acetate; aromatic hydrocarbons such as toluene and xylene; ketones such as methyl ethyl ketone, methyl amyl ketone, cyclohexanone, and 4-hydroxy-4-methyl-2-pentanone; and esters such as ethyl 2-hydroxypropionate, methyl 2-hydroxy-2-methylpropionate, ethyl ethoxyacetate, ethyl glycolate, methyl 2-hydroxy-2-methylbutyrate, methyl 3-methoxypropionate, ethyl 3-methoxypropionate, methyl 3-ethoxypropionate, ethyl acetate, butyl acetate, methyl lactate, and ethyl lactate. These may be used alone or in combination of two or more.

The content of the solvent is not particularly limited, and varies depending on the target viscosity, and is preferably an amount such that the solid content concentration of the alkali-soluble radiation-sensitive resin composition is 1 to 50% by weight, and more preferably 5 to 40% by weight.

The pigment is not particularly limited, and examples thereof include: c.i. pigment yellow 117, c.i. pigment yellow 128, c.i. pigment yellow 129, c.i. pigment yellow 150, c.i. pigment yellow 155, c.i. pigment yellow 185, c.i. pigment red 209, c.i. pigment red 242, c.i. pigment red 254, c.i. pigment green 7, c.i. pigment green 36, c.i. pigment blue 15: 3. c.i. pigment blue 15: 4. c.i. pigment blue 15: 6. c.i. pigment blue 60, carbon black, chromium oxide, iron oxide, titanium black, aniline black, cyanine black, perylene black, and the like. These may be used alone or in combination of two or more.

The content of the pigment is not particularly limited, and is preferably 50 to 150 parts by weight, more preferably 80 to 120 parts by weight, based on 100 parts by weight of the unsaturated group-containing alkali-soluble resin. When the content is less than 50 parts by weight, the light-shielding property may be insufficient; when the amount exceeds 150 parts by weight, the content of the alkali-soluble resin originally serving as a binder decreases, and thus there is a case where an undesirable problem occurs that the developing property is impaired and the film forming ability is impaired.

The alkali-soluble radiation-sensitive resin composition may optionally contain other components in addition to the above components. The other components are not particularly limited, and examples thereof include: an epoxy group-containing compound, a solvent, an epoxy group curing accelerator, a thermal polymerization inhibitor, an antioxidant, an adhesion promoter, a surfactant, an antifoaming agent, and the like.

Examples of the compound having an epoxy group include: and epoxy resins such as phenol novolac epoxy resins, cresol novolac epoxy resins, bisphenol a epoxy resins, bisphenol F epoxy resins, bisphenol S epoxy resins, biphenyl epoxy resins, and alicyclic epoxy resins, and compounds having at least one epoxy group such as phenyl glycidyl ether, p-butylphenol glycidyl ether, triglycidyl isocyanurate, diglycidyl isocyanurate, allyl glycidyl ether, and glycidyl methacrylate. These may be used alone or in combination of two or more.

< cured film >

The cured film of the present invention is obtained by curing the alkali-soluble radiation-sensitive resin composition.

The method for curing the alkali-soluble radiation-sensitive resin composition is not particularly limited, and the following methods may be mentioned: the solution of the resin composition is applied to a substrate or the like by any of a dipping method, a spraying method, a slit coater, a spin coater, and the like, dried, irradiated with light (including ultraviolet rays, radioactive rays, and the like), and then subjected to a development treatment and post-baking.

The thickness of the cured film is not particularly limited, but is preferably 0.1 to 10 μm, more preferably 1 to 5 μm. When the film thickness is less than 0.1. mu.m, the light-shielding property may be insufficient; if the thickness exceeds 10 μm, the entire film may not be sufficiently cured.

The use of the cured film is not particularly limited, and examples thereof include: protective films or interlayer insulating films for color filters, liquid crystal display elements, integrated circuit elements, solid-state imaging elements, and the like, color resists, solder resists used in the production of printed wiring boards, and the like.

The cured film is obtained by curing the alkali-soluble radiation-sensitive resin composition, and therefore has excellent sensitivity, high heat-resistant transparency, high solvent resistance, and high solubility.

< color Filter >

The cured film can be used to form a color filter. The color filter is composed of the cured film, and thus has high sensitivity, high heat-resistant transparency, high solvent resistance, and high solubility.