JP2003222993A - Photosensitive resin composition - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a photosensitive resin composition suitable for a solder resist composition superior in the adhesion of a resist film to copper and the other substrates and wet heat resistance. <P>SOLUTION: The photosensitive resin composition contains a carboxylic photosensitive resin (A), an epoxy hardening agent (B) represented by formula (I) and a photopolymerization initiator (C). In the formula, each of R<SP>1</SP>-R<SP>4</SP>is an H atom or a 1-4C alkyl or 6-18C aryl group and at least one of R<SP>1</SP>-R<SP>4</SP>is a 1-4C alkyl or 6-18C aryl group; each of R<SP>5</SP>and R<SP>6</SP>is an H atom or a 1-2C alkyl group; and n is 0, 1, 2 or 3. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention is preferably used as a solder resist composition used in the manufacture of rigid and flexible printed wiring boards, or LSI packages such as BGA (ball grid array) and CSP (chip size package). And a photosensitive resin composition.

[0002]

2. Description of the Related Art Solder resists are used in the production of printed wiring boards, but in recent years they have also been used in new LSI packages such as BGA and CSP. The solder resist is an essential material as a protective film that prevents solder from adhering to unnecessary portions in the soldering process, and as a permanent mask. As a solder resist, there is a method of printing a thermosetting type by screen printing. The present invention can also be applied to such a method, but in recent years, due to the increase in wiring density, the screen printing method has a limit in resolution, and a photo solder resist which forms a pattern by a photographic method has been actively used. ing. Among them, the alkaline developing type, which can be developed with a weak alkaline solution such as sodium carbonate solution, has become the mainstream from the viewpoint of work environment protection and global environment protection. As such, Japanese Unexamined Patent Publication No. 61-243869 and Japanese Unexamined Patent Publication No. 1-14
The one shown in Japanese Patent No. 1904 is known.

However, the alkali developing type photo solder resist still has a problem in terms of durability. That is, the chemical resistance, water resistance, heat resistance, etc. are inferior to those of the conventional thermosetting type and solvent developing type. This is because alkali-development type photo solder resist is mainly composed of those having a hydrophilic group to enable alkali development.
This is because water, water vapor, etc. easily penetrate, and these reduce the adhesion between the resist film and copper. Especially BGA and C
In semiconductor packages such as SP, it is particularly necessary to have resistance to PCT (pressure cooker test resistance), which is also called resistance to humidity and heat. However, under such severe conditions, it lasts only several hours to ten and several hours. is there.

[0004]

The present invention solves these problems and is suitable as a solder resist composition having excellent adhesiveness to a resist film and copper and other substrates and excellent wet heat resistance. A resin composition is provided.

[0005]

As a result of intensive studies to solve the above problems, the present inventors have found that a photosensitive resin composition comprising a photosensitive resin using a specific epoxy curing agent and a photopolymerization initiator. Furthermore, they have found that a photosensitive resin composition containing these and a triazine compound is excellent in adhesion and durability to copper and other base materials, and have completed the present invention based on this finding.

That is, the present invention is a photosensitive resin composition containing a photosensitive resin (A) having a carboxyl group, an epoxy curing agent (B) represented by the following general formula (I) and a photopolymerization initiator (C). Is provided.

[0007]

[Chemical 2] ^(Wherein, R ^1, R 2, ^{R 3} and ^{R 4} are each a hydrogen atom, an alkyl group or an aryl group having 6 to 18 carbon atoms having 1 to 4 carbon ^atoms, R ^1, R 2, ^{R 3} and R ^At least one of 4 is an alkyl group having 1 to 4 carbon atoms or 6 to 18 carbon atoms;
R ⁵ and R ⁶ each represent a hydrogen atom or an alkyl group having 1 to 2 carbon atoms, and n is 0, 1, 2
Or 3)

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The photosensitive resin (A) having a carboxyl group used in the present invention includes an esterified product of an epoxy compound (a) and an unsaturated monocarboxylic acid, a saturated or unsaturated polybasic acid anhydride. Addition reaction products and the like to which is added are preferably used.

The epoxy compound (a) is, for example, a novolak type epoxy compound obtained by reacting novolaks obtained by reacting phenol, cresol, halogenated phenol or alkylphenols with formaldehyde under an acidic catalyst with epichlorohydrin. Is suitable, and commercially available products of these are Y manufactured by Tohto Kasei Co., Ltd.
DCN-701, 704, YDPN-638, 602,
DEN-431,439 manufactured by Dow Chemical Co., EPN-1299 manufactured by Ciba-Geigy Co., N manufactured by Dainippon Ink and Chemicals, Inc.
-730, 770, 865, 665, 673, VH-4
150, 4240, Nippon Kayaku Co., Ltd. EOCN-120, B
Examples include REN. In addition to the novolac type epoxy compound, for example, an epoxy compound obtained by reacting a reaction product of salicylaldehyde with phenol or cresol with epichlorohydrin (EPPN5 manufactured by Nippon Kayaku Co., Ltd.
02H, FAE2500, etc.) are preferably used. Further, for example, Epicoat 828, 100 manufactured by Yuka Shell Co., Ltd.
7,807, Epichron 84, manufactured by Dainippon Ink and Chemicals, Inc.
0,860,3050, DER-3 made by Dow Chemical Company
30, 337, 361, Celoxide 2021, manufactured by Daicel Chemical Industries, Ltd., TETRAD-X, manufactured by Mitsubishi Gas Chemical Company, Inc.
C, bisphenol A type such as EPB-13, 27 manufactured by Nippon Soda Co., Ltd., GY-260, 255, XB-2615 manufactured by Ciba-Gigi Co., bisphenol F type, hydrogenated bisphenol A type, brominated bisphenol A type, amino group An epoxy compound such as a content-type, alicyclic or polybutadiene-modified glycidyl ether type epoxy compound is also preferably used. Among these, an epoxy compound obtained by reacting a reaction product of salicylaldehyde with phenol or cresol with epichlorohydrin is preferably used from the viewpoint of heat resistance.

Examples of the unsaturated monocarboxylic acid include (meth) acrylic acid, crotonic acid, cinnamic acid and saturated or unsaturated polybasic acid anhydrides and (meth) acrylates having one hydroxyl group in one molecule, or Reaction products of half-ester compounds of a saturated or unsaturated dibasic acid and an unsaturated monoglycidyl compound, such as phthalic acid, tetrahydrophthalic acid, hexahydrophthalic acid, maleic acid, succinic acid and hydroxyethyl (meth) acrylate, Examples thereof include reaction products obtained by reacting hydroxypropyl (meth) acrylate, tris (hydroxyethyl) isocyanurate di (meth) acrylate, and glycidyl (meth) acrylate in an equimolar ratio by a conventional method. These unsaturated monocarboxylic acids can be used alone or in combination.
Of these, acrylic acid is preferred.

As the saturated or unsaturated polybasic acid anhydride, anhydrides such as phthalic acid, tetrahydrophthalic acid, hexahydrophthalic acid, maleic acid, succinic acid and trimellitic acid are used.

Photosensitive resin (A) having a carboxyl group
The acid value (KOHmg / g) is preferably 40 to 250, and more preferably 50 to 150 in view of the balance of the alkali developability and electrical characteristics and other properties.

In addition to the above-mentioned photosensitive resin (A) having a carboxyl group, isocyanate ethyl (meth) acrylate or tolylene diisocyanate or isophorone diisocyanate and (meth) acrylates having one or more hydroxyl groups in one molecule, for example, An unsaturated bond may be introduced through a urethane bond by reacting an equimolar reaction product with hydroxyethyl (meth) acrylate.

Further, as the epoxy compound (a) used for producing the photosensitive resin (A) of the present invention, an epoxy compound having a polyamide unit and / or a polyamideimide unit in the molecular structure is also preferably used. Examples of such an epoxy compound (a) include a carboxyl group-terminated polyamide resin or a carboxyl group synthesized by a condensation reaction from a polycarboxylic acid component such as dicarboxylic acid, tricarboxylic acid, tetracarboxylic dianhydride and an organic diisocyanate or diamine. Group-terminated polyamide-imide resin (b) (hereinafter sometimes referred to as carboxyl-group-terminated polyamide (imide) resin (b)) and epoxy resin (c), (c) epoxy group / (b) carboxyl group The epoxy group-containing polyamide resin (d1) or the epoxy group-containing polyamideimide resin (d2) (hereinafter sometimes referred to as the epoxy group-containing polyamide (imide) resin (d)) obtained by reacting with a molar ratio of more than 1 There is.

The polyvalent carboxylic acid component used in the production of the carboxyl group terminated polyamide (imide) resin (b) includes succinic acid, glutaric acid, adipic acid, azelaic acid, sebacic acid, decanedioic acid and dodecanedioic acid. Acids, aliphatic dicarboxylic acids such as dimer acid, isophthalic acid, terephthalic acid, phthalic acid, naphthalene dicarboxylic acid, diphenyl sulfone dicarboxylic acid, aromatic dicarboxylic acids such as oxydibenzoic acid, trimellitic acid, pyromellitic acid, diphenyl sulfone tetra Examples thereof include aromatic carboxylic acid anhydrides such as carboxylic dianhydride and benzophenone tetracarboxylic dianhydride. These can be used alone or in combination of two or more.

The organic diisocyanate used for the production of the carboxyl group-terminated polyamide (imide) resin (b) is 4,4'-diphenylmethane diisocyanate, 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, 1 , 5-naphthalene diisocyanate, 3,3'-dimethyl-4,4'-diphenylmethane diisocyanate, p-phenylene diisocyanate, m-xylene diisocyanate, m-tetramethyl xylene diisocyanate, and other aromatic diisocyanates, hexamethylene diisocyanate, 2,2 , 4-Trimethylhexamethylene diisocyanate, isophorone diisocyanate, 4,4'-dicyclohexylmethane diisocyanate, transcyclohexane-1,4-
Aliphatic isocyanates such as diisocyanate, hydrogenated m-xylene diisocyanate, lysine diisocyanate and the like can be mentioned. Among these, aromatic diisocyanates are preferable from the viewpoint of heat resistance, and 4,4'-diphenylmethane diisocyanate and tolylene diisocyanate are particularly preferable. These may be used alone, but since they have high crystallinity, it is preferable to use two or more kinds in combination.

Diamine can also be used in place of the above organic diisocyanate. Examples of diamines include phenylenediamine, diaminodiphenylpropane, diaminodiphenylmethane, benzidine, 4,4'-diaminodiphenyl sulfone, 4,4'-diaminodiphenyl sulfide,
Examples thereof include diaminodiphenyl ether. In order to improve the solubility in organic solvents, 2,2-bis (3-
Aminophenoxyphenyl) propane, 2,2-bis (4-aminophenoxyphenyl) propane, 3,3 ′
-Bis (3-aminophenoxyphenyl) sulfone,
4,4'-bis (3-aminophenoxyphenyl) sulfone, 3,3'-bis (4-aminophenoxyphenyl) sulfone, 4,4'-bis (4-aminophenoxyphenyl) sulfone, 2,2-bis (3-Aminophenoxyphenyl) hexafluoropropane, 2,2-bis (4-aminophenoxyphenyl) hexafluoropropane, 1,4-bis (4-aminophenoxy) benzene, 1,3-bis (4-aminophenoxy) )benzene,
It is preferable to use diamines such as 4,4- (p-phenylenediisopropylidene) bisaniline and 4,4- (m-phenylenediisopropylidene) bisaniline.

These organic diisocyanates and diamines may be used alone or in combination of two or more. However, when organic diisocyanate and diamine are used at the same time, they react to form a urea bond having poor heat resistance, which is not preferable.

As the carboxyl group-terminated polyamide (imide) resin (b), a resin having at least one polymer unit selected from polyalkylene oxide units and polycarbonate units in its molecular structure is preferably used. The polyalkylene oxide unit and the polycarbonate unit introduced into the molecular structure are the above-mentioned carboxyl group-terminated polyamide (imide).
When the resin (b) is produced, a dicarboxylic acid having a carboxyl group introduced at both ends of a polyalkylene glycol or a polycarbonate diol is used as a polyvalent carboxylic acid component and reacted with a diisocyanate or a diamine and introduced into a polyamide (imide) skeleton. . Examples of the polyalkylene glycol include polytetramethylene ether glycol, polypropylene glycol, polyethylene glycol, bisphenol A or a reaction product of hydrogenated bisphenol A and these polyalkylene glycols, and the polyalkylene oxide unit introduced by these is one molecule. Two or more kinds may be present therein. Examples of the polycarbonate diol include straight-chain aliphatic polycarbonate diols, and Placcel CD series (manufactured by Daicel Chemical Industries, Ltd.) Nipporan 980, 981.
(Manufactured by Nippon Polyurethane Industry Co., Ltd.) and the like.

In order to introduce a carboxyl group at both ends of polyalkylene glycol or polycarbonate diol to form a carboxylic acid at both ends, a polyvalent carboxylic acid similar to the above-mentioned polycarboxylic acid component, preferably a dicarboxylic acid, is added to the polyalkylene. It may be reacted with glycol or polycarbonate diol.

Further, polyalkylene glycol diamine or polycarbonate diamine having an amino group introduced at the terminal is used as a diamine component, or imidodicarboxylic acid obtained by reacting these with trimellitic acid is used as a polyvalent carboxylic acid component. However, it can be introduced into the carboxyl group-terminated polyamide (imide) resin (b).

The total content of polyalkylene oxide units or polycarbonate units is 10% by weight or more in the carboxyl group-terminated polyamide (imide) resin (b) from the viewpoint of adhesiveness, and 90% by weight from the viewpoint of heat resistance.
It is preferably used below. Further, from the viewpoints of adhesiveness and water absorption resistance, it is preferable to introduce using polytetramethylene ether glycol, polypropylene glycol and a reaction product of these (hydrogenated) bisphenol A. The molecular weight (calculated from the hydroxyl value) of these diols that can be used is preferably 200 to 4,000.

Carboxyl group-terminated polyamide (imide)
In the production of the resin (b), the polycarboxylic acid component has a molar ratio of 1 or more, preferably 1 to 3, and more preferably 1.1 to the total of the diisocyanate component and the diamine component.
It is mixed so as to be 2.2 and reacted.

The above reaction is carried out using lactones such as γ-butyrolactone, amide solvents such as N-methylpyrrolidone (NMP) and dimethylformamide (DMF), sulfones such as tetramethylene sulfone, ethers such as diethylene glycol dimethyl ether and the like. 50 ° C using solvent
React at ~ 250 ° C. Considering the reaction yield, the solubility and the volatility in the subsequent step, it is preferable to use γ-butyrolactone as the main component of the solvent.

Next, as the epoxy resin (c) to be reacted with the carboxyl group-terminated polyamide (imide) resin (b), bisphenol A type epoxy resin, bisphenol F type epoxy resin, bisphenol S type epoxy resin,
Phenol novolac type epoxy resin, cresol novolac type epoxy resin, naphthalene type epoxy resin and its modified products, bixylenyl diglycidyl ether, YD
C1312 (trade name of Toto Kasei Co., Ltd.), Techmore VG31
01 (trade name of Mitsui Petrochemical Co., Ltd.), TMH574 (trade name of Sumitomo Chemical Co., Ltd.), ESLV-80XY, -90CR,
-120TE, -80DE (trade name of Nippon Steel Chemical Co., Ltd.),
Aromatic epoxy resins such as Epicoat 1031S (trade name of Yuka Shell Co., Ltd.), aliphatic epoxy resins such as neopentyl glycol diglycidyl ether, polypropylene glycol diglycidyl ether, tetrahydrophthalic acid diglycidyl ester, triglycidyl isocyanurate And other heterocyclic epoxy compounds.
Of these, a bifunctional epoxy resin is preferable from the viewpoint of reaction control, and an aromatic or heterocyclic epoxy resin is preferable from the viewpoint of heat resistance. Further, a brominated epoxy resin is useful for imparting flame retardancy. These are used alone or in combination of two or more.

The epoxy resin (c) is a carboxyl group-terminated polyamide (imide) resin (b),
The molar ratio of epoxy group of (c) / carboxyl group of (b) is made larger than 1, and the reaction is preferably conducted at 1.1 to 2.5. When the molar ratio of epoxy group / carboxyl group is 1 or less, a resin having an epoxy group introduced at the end of the molecular chain cannot be obtained. The epoxy group-containing polyamide (imide) resin (d) thus obtained has an epoxy equivalent of 500 to 4
It is preferably 10,000. If it is less than 500, the molecular weight is low and the adhesion is poor, and if it exceeds 40,000, the molecular weight is too high and the developability is poor.

The above epoxy group-containing polyamide (imide)
The reaction ratio of the unsaturated monocarboxylic acid to be reacted with the resin (d) is determined by the carboxyl group of the unsaturated monocarboxylic acid / (d)
It is preferable that the molar ratio of the epoxy group is 0.5 to 2.

Further, with respect to the hydroxyl groups remaining in the resin, in consideration of photosensitivity and the like, isocyanate ethyl (meth) acrylate, tolylene diisocyanate or isophorone diisocyanate and one or more hydroxyl groups in one molecule (meta) are used. ) Acrylates may be reacted with equimolar reactants such as hydroxyethyl (meth) acrylate to introduce unsaturated bonds via urethane bonds.

The above epoxy group-containing polyamide (imide)
A saturated or unsaturated polybasic acid anhydride such as phthalic acid, tetrahydrophthalic acid, hexahydrophthalic acid, maleic acid, succinic acid or trimellitic acid is added to the esterified product of the resin (d) and unsaturated monocarboxylic acid. It is preferable.
When it is desired to further increase the acid value, polybasic acid anhydride may be further reacted after the reaction with glycidol.

Photosensitive resin having a carboxyl group (A)
The acid value of is preferably 40 to 250, more preferably 50 to 1 in view of the balance of alkali developability and electric characteristics and other characteristics.
50.

Photosensitive resin (A) having a carboxyl group
In addition, an acrylic resin or a styrene resin having a carboxyl group and a (meth) acrylate group as disclosed in JP-B-7-92603 or JP-A-63-205649 may be used.

In the photosensitive resin composition of the present invention, the preferable blending ratio of the photosensitive resin (A) is 10 to 90% by weight.
It is preferable that

Next, as the epoxy curing agent (B) used in the present invention, those represented by the following general formula (I) are used.

[0034]

[Chemical 3] ^(Wherein, R ^1, R 2, ^{R 3} and ^{R 4} are each a hydrogen atom, an alkyl group or an aryl group having 6 to 18 carbon atoms having 1 to 4 carbon ^atoms, R ^1, R 2, ^{R 3} and R ^At least one of 4 is an alkyl group having 1 to 4 carbon atoms or 6 to 18 carbon atoms;
R ⁵ and R ⁶ each represent a hydrogen atom or an alkyl group having 1 to 2 carbon atoms, and n is 0, 1, 2
Or 3) As the alkyl group having 1 to 4 carbon atoms, for example, a methyl group, an ethyl group, a propyl group, an isopropyl group, an n-butyl group, a sec-butyl group, a tert-butyl group and the like can be mentioned. Examples of the aryl group having 6 to 18 carbon atoms include a phenyl group and a naphthyl group, which may be substituted with an alkyl group having 1 to 3 carbon atoms or an alkoxy group having 1 to 3 carbon atoms.

Specific examples of the epoxy curing agent (B) include YDC1312 manufactured by Tohto Kasei Co., Ltd. for n: 0, ESLV-80XY manufactured by Nippon Steel Chemical Co., Ltd. for n: 1, and ESLV manufactured by Nippon Steel Chemical Co., Ltd. for n: 2. -90CR is available. Also, a bisphenol F type epoxy resin can be used. These are disclosed in JP-A-8-
Bixylenol type epoxy resin described in Japanese Patent No. 269172; YX4000 manufactured by Yuka Shell Co., Ltd. dissolves only 1 g in a 10 g solution of carbitol acetate / solvesso 150 = 1/1 (weight ratio), which is a typical solvent for resist. It dissolves more than 2g while there is no. Thus, even if it is soluble, the sensitivity and developability are good, and the PCT resistance,
Satisfies the characteristics required for thermocycle resistance test and other package resists. When n: 4 or more, the epoxy equivalent becomes large, which is not preferable in terms of heat resistance. Among these, n: 1 ESLV-80XY is more preferably used.

A part of the above epoxy curing agent (B) (50
% Or less) may be used in place of another epoxy curing agent. The other epoxy curing agent may or may not have a photosensitive group.

As the epoxy curing agent having a photosensitive group, an addition reaction product obtained by adding an acid anhydride to an esterification product of a novolac type epoxy compound used as a photosensitive resin (A) having a carboxyl group and an unsaturated monocarboxylic acid is used. An epoxy acrylate compound before addition of an acid anhydride is preferably used. Furthermore, a urethane compound obtained by introducing isocyanate ethyl methacrylate or the like into an epoxy acrylate compound through a urethane bond is also suitably used.

The epoxy curing agent having no photosensitive group is preferably an epoxy resin having two or more epoxy groups in the molecule, specifically, bisphenol A type epoxy resin, bisphenol S type epoxy resin and bromine thereof. Derivatives such as compounds, phenol or cresol novolac type epoxy resins, biphenyl type epoxy resins such as “YX4000” (trade name of Yuka Shell Epoxy Co., Ltd.), special glycidyl ether type epoxy resins such as “TACTIX 742” (product of Dow Chemical Co., Ltd. Name),
"ZX1257" (manufactured by Tohto Kasei Co., Ltd.), ESLV-120
Glycidyl ether-based epoxy resins such as TE and -80DE (trade name, manufactured by Nippon Steel Chemical Co., Ltd.); glycidyl ester-based epoxy resins, such as "Denacol EX711" (trade name, manufactured by Nagase Kasei Co., Ltd.), glycidyl amine-based epoxy resins, such as "YH434" (Trade name manufactured by Tohto Kasei Co., Ltd.), a naphthalene type epoxy resin, for example, "Epiclon HP-4
032 "(trade name of Dainippon Ink and Chemicals, Inc.), dicyclo type epoxy resin, for example," Epiclon HP7200.
H ”(trade name of Dainippon Ink and Chemicals, Inc.), cycloaliphatic epoxy resins, heterocyclic epoxy resins, hydantoin type epoxy resins, special epoxy resins such as triglycidyl isocyanurate, and the like.

A preferred blending ratio of the epoxy curing agent (B) is 0.1 to 40% by weight, more preferably 1 to 30% by weight, based on the photosensitive resin composition. If it is less than 0.1% by weight, curing tends to be insufficient, and if it exceeds 40% by weight, the photosensitive properties tend to deteriorate.

Examples of the photopolymerization initiator (C) used in the present invention include benzoins such as benzoin, benzoin methyl ether and benzoin isopropyl ether, acetophenone, 2,2-dimethoxy-2-phenylacetophenone and 2,2- Diethoxy-2-phenylacetophenone, 1,1-dichloroacetophenone, 1-hydroxycyclohexyl phenyl ketone, 2-methyl-1-
Acetophenones such as [4- (methylthio) phenyl] -2-morpholinopropan-1-one, 2,2-diethoxyacetophenone, N, N-dimethylaminoacetophenone, 2-methylanthraquinone, 2-ethylanthraquinone, 2 -Tert-butylanthraquinone,
Anthraquinones such as 1-chloroanthraquinone, 2-amylanthraquinone and 2-aminoanthraquinone,
Thioxanthones such as 2,4-dimethylthioxanthone, 2,4-diethylthioxanthone, 2-chlorothioxanthone and 2,4-diisopropylthioxanthone, ketals such as acetophenone dimethyl ketal and benzyl dimethyl ketal, benzophenone, methylbenzophenone, 4,4 ′ -Dichlorobenzophenone, 4,4 ′
-Bis (diethylamino) benzophenone, Michler's ketone, benzophenones such as 4-benzoyl-4'-methyldiphenyl sulfide, 2- (o-chlorophenyl) -4,5-diphenylimidazole dimer, 2-
(O-Chlorophenyl) -4,5-di (m-methoxyphenyl) imidazole dimer, 2- (o-fluorophenyl) -4,5-diphenylimidazole dimer, 2-
(O-Methoxyphenyl) -4,5-diphenylimidazole dimer, 2- (p-methoxyphenyl) -4,5
-Diphenylimidazole dimer, 2,4-di (p-methoxyphenyl) -5-phenylimidazole dimer,
2,4,5-triarylimidazole dimer such as 2- (2,4-dimethoxyphenyl) -4,5-diphenylimidazole dimer, 9-phenylacridine, 1,7
Examples thereof include acridine derivatives such as -bis (9,9'-acridinyl) heptane, and 2,4,6-trimethylbenzoyldiphenylphosphine oxide. These can be used alone or in combination of two or more kinds. A preferred blending ratio of the photopolymerization initiator (C) is 0.1 to 20% by weight, and more preferably 1 to 10% by weight based on the photosensitive resin composition.

Further, a photopolymerization initiation aid can be added to the photosensitive resin composition of the present invention. N, N-dimethylaminobenzoic acid ethyl ester as a photopolymerization initiation aid,
N, N-dimethylaminobenzoic acid isoamyl ester,
There are tertiary amines such as pentyl-4-dimethylaminobenzoate, dimethylethanolamine, triethylamine and triethanolamine. These are preferably used in the photosensitive resin composition alone or in a mixture of 0.1 to 2
It can be used in the range of 0% by weight.

As the triazine compound (D) used in the present invention, melamine, acetoguanamine, benzoguanamine, melamine-phenol formalin resin, ethyldiamino-S-triazine, 2,4-diamino-S.
-Triazine, 2,4-diamino-6-xylyl-S-
Examples include triazine and the like. The triazine compound (D) is not particularly limited as long as it has a triazine ring. Examples of commercially available triazine compounds include 2MZ-AZINE and 2E manufactured by Shikoku Chemicals Co., Ltd. shown below.
4MZ-AZINE, C11Z-AZINE, etc. are mentioned.

[0043]

[Chemical 4]

These compounds improve the adhesion to the copper circuit, improve the PCT resistance, and are also effective in electrolytic corrosion. These may be used alone or in combination of two or more. A preferable blending ratio of the triazine compound (D) is 0.1 to 40% by weight, and more preferably 0.1 to 20% by weight based on the photosensitive resin composition.

If desired, other curing agents and heat curing accelerators may be used. As the curing agent, boron trifluoride-amine complex, dicyandiamide, organic acid hydrazide, diaminomaleonitrile, urea, alkylated melamine resins such as hexamethoxymethylated melamine, salts of polyamines, diaminodiphenylmethane, metaphenylenediamine, diaminodiphenylmethane. , Metaxylene diamine, diaminodiphenyl sulfone,
Aromatic amines such as "HARDNER HT972" (trade name, manufactured by Ciba-Geigy), phthalic anhydride, trimellitic anhydride, ethylene glycol bis (anhydrotrimellitate), glycerol tris (anhydrotrimellitate), benzophenone tetra Examples thereof include aromatic acid anhydrides such as carboxylic acid anhydrides, aliphatic acid anhydrides such as maleic anhydride and tetrahydrophthalic anhydride, polyvinylphenol, polyvinylphenol bromide, polyphenols such as phenol novolac and alkylphenol novolac.

As the thermosetting accelerator, metal salts of acetylacetone such as acetylacetonate Zn, enamine, tin octylate, quaternary phosphonium salts, tertiary phosphines such as triphenylphosphine, tri-n-butyl ( 2,5-dihydroxyphenyl) phosphonium bromide, phosphonium salts such as hexadecyltributylphosphonium chloride, quaternary ammonium salts such as benzyltrimethylammonium chloride, phenyltributylammonium chloride, diphenyliodonium tetrafluoroporoate, triphenylsulfonium hexafluoroantimonate Etc., poloates, antimonates, dimethylbenzylamine, 1,8-diazabicyclo [5,4,0] undecene, m-aminophenol, 2,4,6 Tris (dimethylamino phenol), tertiary amines such as tetramethyl guanidine, 2
-Ethyl-4-methylimidazole, 2-methylimidazole, 1-benzyl-2-methylimidazole, 2-
Phenylimidazole, 2-phenyl-4-methyl-5
-Imidazoles such as hydroxymethylimidazole can be mentioned, and they can be used alone or in a mixture. Curing agent,
The thermosetting accelerator is preferably used in the range of 0.01 to 10% by weight of the photosensitive resin composition.

The photosensitive resin composition of the present invention may be used by adding various photosensitive monomers for the purpose of improving photosensitivity and various characteristics, if necessary. For example, 2-hydroxyethyl (meth) acrylate, trimethylolpropane tri (meth) acrylate, pentaerythritol tri (meth) acrylate, dipentaerythritol hexa (meth) acrylate, N, N-dimethyl (meth) acrylate, N-methylol. (Meth) acrylamide, urethane (meth) acrylate, reaction product of polyethylene glycol, polypropylene glycol, bisphenol A and polyethylene glycol or propylene glycol, mono- or polyfunctional (meth) acrylate such as tris (2-hydroxyethyl) isocyanuric acid , Photopolymerizable monomers such as (meth) acrylates of glycidyl ethers such as triglycidyl isocyanurate, and diallyl phthalate can be used. These can be used alone or in a mixed system. The photosensitive monomer is preferably 0.1 to 30 in the photosensitive resin composition.
Used in the weight% range.

The photosensitive resin composition of the present invention can be diluted with an organic solvent if necessary. For example, ethyl methyl ketone, ketones such as cyclohexanone, toluene,
Aromatic hydrocarbons such as xylene, methyl cellosolve, butyl cellosolve, methyl carbitol, butyl carbitol, propylene glycol monomethyl ether, dipropylene glycol monoethyl ether, glycol ethers such as triethylene glycol monoethyl ether, ethyl acetate, butyl acetate , Esters such as butyl cellosolve acetate and carbitol acetate, alcohols such as ethanol, propanol, ethylene glycol and propylene glycol, aliphatic hydrocarbons such as octane and decane, petroleum ether, petroleum naphtha, hydrogenated petroleum naphtha, solvent naphtha, etc. Petroleum-based solvents and the like.

The photosensitive resin composition of the present invention may contain barium sulfate, barium titanate, powdered silicon oxide, amorphous silica, if necessary, for the purpose of improving properties such as adhesion and hardness.
Inorganic fillers such as talc, clay, calcined kaolin, magnesium carbonate, calcium carbonate, aluminum oxide, aluminum hydroxide and mica powder can be used. The amount used is preferably 0 to 60% by weight. Further, if necessary, a coloring agent such as phthalocyanine blue, phthalocyanine green, iodin green, disazo yellow, crystal violet, titanium oxide, carbon black or naphthalene black can be used. Furthermore, hydroquinone, hydroquinone monomethyl ether, te
Polymerization inhibitors such as rt-butylcatechol, pyrogallol, phenothiazine, thixotropic agents such as benton, montmorillonite, aerosil, amide wax, defoaming agents such as silicone-based, fluorine-based and polymer-based defoaming agents, leveling agents,
In addition, additives such as adhesion promoters such as imidazole compounds, thiazole compounds, triazole compounds and silane coupling agents can be used.

The photosensitive resin composition of the present invention can be obtained as a cured product by uniformly mixing the raw materials blended in the above proportions with a roll mill, a bead mill or the like and curing the mixture as follows, for example. That is, the composition of the present invention is applied to a printed wiring board or the like with a film thickness of 10 to 160 μm by a method such as a screen printing method, a spray method, an electrostatic spray method, an airless spray method, a curtain coater method, or a roll coat method. After drying the coating film at 60 to 110 ° C., a negative film is placed on the coating film, irradiated with radiation such as ultraviolet rays, and then the unexposed portion is diluted with a dilute alkaline aqueous solution (for example, 0.5 to 2 wt% sodium carbonate). After dissolution removal (development) with an aqueous solution, etc., it is usually irradiated with ultraviolet rays and / or heated (for example, 100 to 20).
Sufficient curing is performed at 0 ° C for 0.5 to 1.0 hour to obtain a cured film.

The photosensitive resin composition of the present invention is particularly useful as a solder resist composition for printed wiring boards and packages such as BGA and CSP.
It can also be used for coating materials such as glass, ceramics, plastics, and paper.

[0052]

EXAMPLES The present invention will now be described in detail based on examples, but the present invention is not limited thereto.

[Photosensitive resin having a carboxyl group (A
-1) Production Example] In a flask equipped with a stirrer, a reflux condenser and a thermometer, 55.7 parts by weight of salicylaldehyde-phenol type epoxy resin (epoxy equivalent: 168), 24.1 parts by weight of acrylic acid, methylhydroquinone. 0.1
Part by weight, 26 parts by weight of carbitol acetate and 17 parts by weight of solvent naphtha (Solvesso 150) were charged,
The mixture was dissolved by heating with stirring at 70 ° C. Next, the solution was cooled to 50 ° C., 1 part by weight of triphenylphosphine was charged, and the mixture was heated to 100 ° C. to give a solid content acid value of 1 (KOH
It was made to react until it became less than mg / g). Next, the resulting solution was cooled to 50 ° C., charged with 20.3 parts by weight of tetrahydrophthalic anhydride, 5 parts by weight of carbitol acetate, and 4 parts by weight of solvent naphtha, and allowed to react at 80 ° C. for a predetermined time to obtain a solid acid. Value 80 (KOH mg / g), solid content 67 wt% unsaturated group-containing polycarboxylic acid resin (A-
1) was obtained.

[Photosensitive resin having a carboxyl group (A
-2) Production Example] In a flask equipped with a stirrer, a reflux condenser and a thermometer, 200 parts by weight of a cresol novolac type epoxy resin (epoxy equivalent: 200) and acrylic acid 7
0 parts by weight, methylhydroquinone 0.4 parts by weight, carbitol acetate 80 parts by weight and solvent naphtha 20
Part by weight was charged and the mixture was heated and stirred at 70 ° C. to dissolve the mixture. Next, the solution was cooled to 50 ° C., 1 part by weight of triphenylphosphine was charged, and the mixture was heated to 100 ° C. and reacted until the solid content acid value was 1 (KOH mg / g) or less. Next, the obtained solution was cooled to 50 ° C., 51 parts by weight of maleic anhydride, 48 parts by weight of carbitol acetate and 10 parts by weight of solvent naphtha were charged, and the mixture was reacted at 80 ° C. for a predetermined time to give a solid acid value of 67 ( KOH mg /
g), an unsaturated group-containing polycarboxylic acid resin (A-2) having a solid content of 67% by weight was obtained.

[Production Example of Polytetramethylene Ether Glycol (PTG) Carboxylates (B-1) at Both Terminals]
In a flask equipped with a stirrer, a reflux condenser, an inert gas inlet and a thermometer, PTG (average molecular weight 1,000);
1,000 g, sebacic acid; 405 g were charged, the temperature was raised to 200 ° C. over 2 hours, the reaction was continued for 3 hours, and then the mixture was cooled. A carboxylic acid product at both terminals of the introduced PTG was obtained.

Similarly, a polypropylene glycol both-ends diamine in which amino groups are introduced into both ends of polypropylene glycol (PPG-NH ₂ : average molecular weight 900)
A carboxylic acid product (B-2) at both ends of was obtained in the formulation shown in Table 1.

In the same manner, a polypropylene glycol reaction product of bisphenol A (Bis-PPG: average molecular weight 1,450) and a carboxylic acid product at both ends (B-3) were obtained in the formulation shown in Table 1.

Similarly, a polycarbonate diol (Plaxel CD220: average molecular weight 2,000; Daicel Chemical Industries, Ltd.) was obtained with the composition shown in Table 1.

The characteristics of the obtained carboxylic acid having both terminals are shown in Table 1.
It was shown to.

[0060]

[Table 1]

[Production Example of Photosensitive Polyamide Resin (C-1)] γ-butyrolactone; 100 g, in a flask equipped with a stirrer, a reflux condenser, an inert gas inlet and a thermometer.
NMP; 50 g was charged, and the above (B-1); 5
5.6 g, adipic acid; 6.1 g, sebacic acid; 8.3
g, isophthalic acid; 13.7 g, 4,4'-diphenylmethane diisocyanate (MDI); 13.8 g, Coronate T80 (tolylene diisocyanate; TDI; manufactured by Nippon Polyurethane Industry Co., Ltd.); 14.4 g, 20
The temperature was raised to 0 ° C., the temperature was maintained for 4 hours, and the mixture was cooled to obtain a polyamide resin having a heating residue of 40% by weight and an acid value (solid content) of 83.5.
Bisphenol A type epoxy resin Epicoat 10
01 (Oilized Shell Epoxy) 141.5g was charged,
Dimethylformamide (DM
F) was added to make the heating residue 40% by weight. Acrylic acid (10.7 g) was added at 120 ° C., and the mixture was kept warm for 3 hours, and then tetrahydrophthalic anhydride (THPA) (90.6 g) was added and kept warm for 1 hour. Further, 58.4 g of glycidol was added and kept warm for 2 hours, and then 240 g of THPA was added and kept warm for 2 hours.
Then, the mixture was diluted with DMF to obtain a photosensitive polyamide resin (C-1) having a heating residue of 55% by weight and an acid value (solid content) of 145.

[Photosensitive Polyamideimide Resin (C-2)
Production Example] A flask equipped with a stirrer, a reflux condenser, an inert gas inlet and a thermometer was charged with 50 g of NMP,
2,2-bis (4-aminophenoxyphenyl) propane (hereinafter referred to as BAPP); 12.4 g (0.030 mol), trimellitic anhydride; 11.6 g (0.060 mol) were charged, and at 200 ° C. It was kept warm for 2.5 hours. The above (B-2); 41.0 g (0.033 mol), adipic acid; 4.3 g (0.029 mol), sebacic acid;
5.9 g (0.029 mol), isophthalic acid; 4.9 g
(0.029 mol), 4,4'-diphenylmethane diisocyanate (MDI); 18.9 g (0.075 mol), Coronate T80 (tolylene diisocyanate;
TDI; manufactured by Nippon Polyurethane Industry Co., Ltd .; 8.8 g (0.
050 mol) and 100 g of γ-butyrolactone were charged, the temperature was raised to 200 ° C., the temperature was kept for 4 hours, and then cooled. A polyamideimide resin having a heating residue of 40% by weight and an acid value (solid content) of 32.8 was obtained. Further, 66.8 g of bisphenol A type epoxy resin; Epicoat 1001; 66.8 g was charged so as to have twice the amount of carboxyl groups, and after keeping the temperature at 140 ° C. for 2 hours, DMF was added to make the heating residue 40% by weight, and then 12
Add acrylic acid (5.0 g) at 0 ° C and incubate for 3 hours, then TH
PA; 42.9 g was added and kept warm for 1 hour. Then D
The mixture was diluted with MF to obtain a photosensitive polyamideimide resin (B-2) having a heating residue of 55% by weight and an acid value (solid content conversion) of 85.

Compositions shown in Tables 2 and 3 (unit:
Similarly, in (g), a polyamide (imide) resin (C-3 to C-
4) was obtained.

[0064]

[Table 2]

[0065]

[Table 3]

[Production Example of Resin (D-1) Having Acrylate Group and Epoxy Group] (D-1) Production Example A cresol novolac type epoxy resin (epoxy equivalent) was placed in a flask equipped with a stirrer, a reflux condenser and a thermometer. : 2
00) 200 parts by weight, acrylic acid 20 parts by weight, methylhydroquinone 0.4 parts by weight, carbitol acetate 8
Charge 0 parts by weight and 20 parts by weight of solvent naphtha, and
The mixture was dissolved by heating with stirring at 0 ° C. Next, the solution was cooled to 50 ° C., 0.5 parts by weight of triphenylphosphine was charged, and the mixture was heated to 100 ° C. to give a solid content acid value of 1 (KO).
The reaction was carried out until the amount became below H mg / g). 10 parts by weight of solvent naphtha was charged to obtain a resin (D-1) having a solid content of 67% by weight.

Examples 1 to 5, Comparative Examples 1 and 2, A: 70 g and B: 30 g obtained by kneading A and B separately using three rolls according to the compositions shown in Table 4 and Table 5.
Were mixed to prepare a resist ink composition. This was applied to a copper clad laminate by screen printing using a 100-mesh polyester screen so that the film thickness after drying was 25 to 35 μm, and the coating film was dried at 80 ° C. for 20 minutes to obtain a resist. After the negative mask film having a pattern was adhered, it was irradiated with ultraviolet rays for a predetermined time using an ultraviolet exposure device. Next, 6 with 1% aqueous sodium carbonate solution
Spray development for 0 seconds (Spray pressure: 2.0 kg / cm
² ) Then, the unexposed portion was dissolved and removed, and the developability was evaluated.

Next, using a circulating hot air dryer, 150 ° C.
The resultant cured film was evaluated by heat curing for 1 hour.

Similarly, according to the compositions shown in Tables 4 and 5, Examples 2, 3, 4, 5 and Comparative Examples 1 and 2 were prepared, and the same tests as in Example 1 were carried out. The test results are shown in Table 6.

[0070]

[Table 4]

[0071]

[Table 5]

[0072]

[Chemical 5]

[0073]

[Table 6]

[0074]

The photosensitive resin composition of the present invention is excellent in adhesion, heat resistance, PCT resistance and developability, and is suitable as a solder resist composition used in the manufacture of LSI packages and the like.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁷ Identification code FI Theme Coat (reference) H05K 3/00 H05K 3/00 F (72) Inventor Toshihiko Ito Gobunichi, Sunayama, Hasaki-cho, Kashima-gun, Ibaraki Prefecture Hitachi Chemical Co., Ltd., Kashima Plant (72) Inventor Tosumi Yoshino, Ichigo, Kashima-gun, Hasaki-machi, Osamu, No. 5 Sunayama, Hitachi Chemical Co., Ltd. Kashima Plant, (72) Inventor, Hiroaki Hirakura, Ibaraki, Kashima-gun, Hasaki-machi Sunayama Gobanichi F-term in Kashima Plant of Hitachi Chemical Co., Ltd. (reference) 2H025 AA10 AA11 AA14 AB15 AC01 AD01 BC13 BC42 BC72 BC73 BC74 BC85 BD03 BD23 CA00 CC17 FA17 4J002 CD02W CD05W CD06W CD13W CD14W CD20X EE037 EU117FD EU57186 EE014 EU1757 EU0186 EU0176 4J036 AD01 AD07 AD08 AG01 AH01 FA12 FB11 FB13 FB14 HA02 JA09

Claims (7)

[Claims] 1. A photosensitive resin composition containing a photosensitive resin (A) having a carboxyl group, an epoxy curing agent (B) represented by the following general formula (I) and a photopolymerization initiator (C). [Chemical 1] ^(Wherein, R ^1, R 2, ^{R 3} and ^{R 4} are each a hydrogen atom, an alkyl group or an aryl group having 6 to 18 carbon atoms having 1 to 4 carbon ^atoms, R ^1, R 2, ^{R 3} and R ^At least one of 4 is an alkyl group having 1 to 4 carbon atoms or 6 to 18 carbon atoms;
R ⁵ and R ⁶ each represent a hydrogen atom or an alkyl group having 1 to 2 carbon atoms, and n is 0, 1, 2
Or 3) 2. The photosensitive resin composition according to claim 1, which contains a triazine compound (D) in addition to the photosensitive resin (A), the epoxy curing agent (B) and the photopolymerization initiator (C). 3. A photosensitive resin (A) having a carboxyl group is an addition reaction product obtained by adding a saturated or unsaturated polybasic acid anhydride to an esterified product of an epoxy compound (a) and an unsaturated monocarboxylic acid. The photosensitive resin composition according to claim 1. 4. The epoxy compound (a) is an epoxy compound obtained by reacting a reaction product of salicylaldehyde and phenol or cresol with epichlorohydrin.
The photosensitive resin composition described. 5. The photosensitive resin composition according to claim 3, wherein the epoxy compound (a) is an epoxy compound having a polyamide unit and / or a polyamideimide unit in its molecular structure. 6. The epoxy compound (a) comprises a carboxyl group-terminated polyamide resin and / or a carboxyl group-terminated polyamideimide resin (b) and an epoxy resin (c).
The photosensitive resin according to claim 3 or 5, which is an epoxy group-containing polyamide resin or an epoxy group-containing polyamideimide resin obtained by reacting at a molar ratio of (c) epoxy group / (b) carboxyl group greater than 1. Composition. 7. A carboxyl group-terminated polyamide resin and / or a carboxyl group-terminated polyamideimide resin (b)
7. The photosensitive resin composition according to claim 6, wherein is a resin having a polyalkylene oxide unit and / or a polycarbonate unit in its molecular structure.