JP2009265388A - Photosensitive resin composition, and photosensitive permanent resist and photosensitive film, using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a photosensitive resin composition excellent in storage stability and excellent also in HAST resistance, and a dry film type alkali-developable photosensitive solder resist and a photosensitive film. <P>SOLUTION: The photosensitive resin composition excellent in storage stability and HAST resistance includes (A): a photosensitive prepolymer having a carboxyl group and a photopolymerizable unsaturated group, in which a total content of chlorine and hydrolyzable chlorine is ≤100 ppm; (B) a photopolymerizable monomer having at least one ethylenically unsaturated group per molecule; (C) a photopolymerization initiator; (D) a high-purity epoxy resin having a chlorine content of ≤200 ppm and a hydrolyzable chlorine content of ≤500 ppm; and (E) a curing accelerator. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a photosensitive resin composition for printed wiring boards, semiconductor package substrates, and flexible wiring boards, and a photosensitive permanent resist and a photosensitive film using the same.

With the reduction in size and weight of various electronic devices, photosensitive solder resist is used for printed wiring boards, semiconductor package boards, and flexible wiring boards for the purpose of forming fine opening patterns. Such a solder resist is required to have developability, high resolution, crack resistance, insulation reliability, solder heat resistance, gold plating resistance, and the like. In recent years, among the above characteristics, the importance of the item has increased in insulation reliability. Particularly, a solder resist for a semiconductor package substrate is required for HAST resistance between fine wirings. The HAST test is a test for evaluating the occurrence level of migration and insulation resistance by applying a voltage between wirings under conditions of 130 ° C. and 85% RH. Alternatively, the test temperature is high and the conditions are severe as compared with a test in which a voltage is applied at 85 ° C. and 85%. Furthermore, recently, the pitch between wirings has been narrowed, and the resistance at the time of HAST when the line / space is 10 μm / 10 μm or 8 μm / 8 μm is required, and the conventional solder resist cannot be used.
On the other hand, in recent years, dry film type solder resists have attracted attention from the viewpoints of film thickness uniformity, surface smoothness, and thin film formation. The dry film type also has advantages such as process simplification and reduction in solvent discharge.
The general solder resist currently used is mainly a liquid two-component type in which a curing agent epoxy resin and a carboxylic acid-containing photosensitive prepolymer for imparting alkali developability are separately provided. As the photosensitive prepolymer, an alkali developable photosensitive prepolymer obtained by adding acrylic acid to a cresol novolak type epoxy resin as disclosed in JP-A-61-2243869 and then acid-modifying is widely used. In order to improve crack resistance, a method of adding an elastomer to a photosensitive resin composition as disclosed in JP-A-2002-162738 has been put into practical use. However, although the above-mentioned photosensitive resin composition is excellent in solder heat resistance and the like, insulation reliability is not sufficient under recent HAST test conditions, and further improvement in resistance is required.
Moreover, since it is a conventional liquid two-component type solder resist, the epoxy resin as a curing agent and the photosensitive prepolymer having a carboxylic acid necessary for imparting developability react at room temperature, so the stability after mixing two components ( There was a problem in pot life), and when this was made into a dry film, there was a problem in storage stability.

Japanese Patent Laid-Open No. 61-243869 JP 2002-162738 A

  It is an object of the present invention to provide a photosensitive resin composition excellent in storage stability and excellent in HAST resistance, a dry film type photosensitive permanent resist using the same, and a photosensitive film. To do.

To achieve the above object, the present invention provides [1] (A) a photosensitive prepolymer having a carboxyl group having a total content of chlorine and hydrolyzable chlorine of 100 ppm or less, and a photopolymerizable unsaturated group, B) a photopolymerizable monomer having at least one ethylenically unsaturated group in the molecule, (C) a photopolymerization initiator, (D) a chlorine content of 200 ppm or less, and a hydrolyzable chlorine content. The present invention relates to a photosensitive resin composition containing a high-purity epoxy resin of 500 ppm or less and (E) a curing accelerator.
The photosensitive resin composition of the present invention is applied to the surface of a printed wiring board substrate, irradiated with actinic rays in the form of an image, the exposed area is photocured, and the unexposed area is removed by development to form a resist pattern and cured. It has been found that a photosensitive permanent resist formed as described above can achieve the above problems. Furthermore, the resin composition is excellent in storage stability, can be formed into a dry film and used as a photosensitive film, and is excellent in storage stability and HAST resistance.
The present invention also provides [2] (a) an epoxy compound having two epoxy groups in the molecule having a chlorine content of 200 ppm or less and a hydrolyzable chlorine content of 500 ppm or less, and ethylene in the molecule. An epoxycarboxylate compound obtained by reacting a monocarboxylic acid compound having a polymerizable unsaturated group, (b) a diisocyanate compound, (c) a diol compound having a carboxyl group, and (d) an ethylenically unsaturated group in the molecule. The photosensitive resin composition according to the above [1], which contains, as the photosensitive prepolymer (A), a polyurethane compound having a total content of chlorine and hydrolyzable chlorine of 100 ppm or less, obtained by reacting an epoxy compound having Related to things.
Moreover, this invention has an ethylenically unsaturated group in the [3] side chain, and an ethylenically unsaturated group density | concentration is 1.0 * 10 < ^-5 > -6.0 * 10 < ^-3 > mol / g, And it is related with the photosensitive resin composition as described in said [1] which contains the radically polymerizable copolymer whose sum total of content of chlorine and hydrolyzable chlorine is 100 ppm or less as a photosensitive prepolymer (A).
[4] The present invention provides [4], wherein the radically polymerizable copolymer according to the above [3] having a repeating unit derived from maleimide or a maleimide derivative in the molecule is contained as the photosensitive prepolymer (A). It relates to the described photosensitive resin composition.
In the present invention, [5] (D) a high-purity epoxy resin having a chlorine content of 200 ppm or less and a hydrolyzable chlorine content of 500 ppm or less is solid and softened at room temperature (25 ° C.). It is related with the photosensitive resin composition in any one of said [1] thru | or [4] whose point is 30 to 100 degreeC.
In the present invention, [6] (E) the thermosetting accelerator is an amine compound, an imidazole derivative, a quaternary ammonium salt compound, a phosphorus compound, a guanamine compound, an s-triazine derivative, an aromatic acid anhydride, an aliphatic acid. The photosensitive resin composition according to any one of [1] to [5], which is at least one selected from an anhydride and polyphenol.
In the present invention, [7] (E) the curing accelerator is dicyandiamide, imidazole, 2-methylimidazole, 2-ethylimidazole, 2-vinyl-4,6-diamino-s-triazine / isocyanuric acid adduct. The photosensitive resin composition according to any one of [1] to [6], which is at least one selected.
The present invention also provides [8] the photosensitivity according to any one of [1] to [7] above, which further comprises (F) a polyfunctional maleimide compound having at least two maleimides in the molecule as a crosslinking agent. The present invention relates to a functional resin composition.
The present invention further includes [9] the photosensitive resin composition according to any one of [1] to [8], further comprising (G) an elastomer that is not completely compatible with (A) the photosensitive prepolymer. The present invention relates to a photosensitive resin composition.
The present invention also relates to [10] the photosensitive resin composition according to any one of [1] to [9], further comprising (H) an inorganic filler.
The present invention also relates to [11] a photosensitive permanent resist comprising the photosensitive resin composition according to any one of [1] to [10].
The present invention also provides [12] a photosensitive film comprising a photosensitive laminate formed by applying the photosensitive resin composition according to any one of [1] to [10] above onto a support and drying. About.

Hereinafter, preferred embodiments of the present invention will be described in detail.
In the present invention, (meth) acrylic acid means acrylic acid and methacrylic acid corresponding thereto, (meth) acrylate means acrylate and corresponding methacrylate, (meth) acryloyl group means acryloyl group and The methacryloyl group corresponding to it means a (meth) acryloxy group means an acryloxy group and a methacryloxy group corresponding to it.
The photosensitive resin composition of the present invention comprises (A) a photosensitive prepolymer having a carboxyl group having a total content of chlorine and hydrolyzable chlorine of 100 ppm or less, and a photopolymerizable unsaturated group, and (B) in the molecule. A photopolymerizable monomer having at least one ethylenically unsaturated group, (C) a photopolymerization initiator, (D) a chlorine content of 200 ppm or less, and a hydrolyzable chlorine content of 500 ppm or less. Contains a high purity epoxy resin (E) curing accelerator.
The main feature of the present invention is that the total content of chlorine and hydrolyzable chlorine in the photosensitive resin composition is 100 ppm or less. As the photosensitive resin composition, high purity (A) carboxyl It is characterized in that a photosensitive prepolymer having a group and a photopolymerizable unsaturated group, and a high-purity (D) epoxy resin are used.
The photosensitive prepolymer having (A) a carboxyl group and a photopolymerizable unsaturated group used in the present invention may be any as long as it has a high purity and the total content of chlorine and hydrolyzable chlorine is 100 ppm or less. It is difficult to produce a highly pure photosensitive prepolymer, and it is desirable to use the compounds described below.

  Examples of the photosensitive prepolymer of the present invention include (a) an epoxy compound having two epoxy groups in a molecule having a chlorine content of 200 ppm or less and a hydrolyzable chlorine content of 500 ppm or less. An epoxycarboxylate compound obtained by reacting with a monocarboxylic acid compound having an ethylenically unsaturated group, (b) a diisocyanate compound, (c) a diol compound having a carboxyl group, and (d) an ethylenically unsaturated group in the molecule. It is desirable to use a polyurethane compound obtained by reacting an epoxy compound having a group and having a total content of chlorine and hydrolyzable chlorine of 100 ppm or less. Compared with an alkali-developable photosensitive prepolymer in which acrylic acid is added to a cresol novolac type epoxy resin as disclosed in JP-A-61-2243869 and then acid-modified, this polyurethane compound contains a diol and a diisocyanate. The use is characterized in that the content of chlorine and hydrolyzable chlorine can be easily reduced and high purity can be achieved. Further, a high-purity epoxy resin complicates the production process and is generally expensive. However, the polyurethane compound is effective in terms of cost because it requires a small amount of epoxy resin in the photosensitive prepolymer. In addition, the polyurethane compound becomes a cured film having excellent toughness and elongation due to the urethane structure, and becomes a solder resist having excellent crack resistance.

Here, the structure of the hard segment part of the epoxy acrylate compound having two or more hydroxyl groups and ethylenically unsaturated groups in the molecule of the raw material which is one of the main skeletons of polyurethane is preferably a bisphenol A type structure. The thing is marketed as UXE series (made by Nippon Kayaku Co., Ltd.), and is available as UXE-3011, UXE-3012, UXE-3024 (sample name, made by Nippon Kayaku Co., Ltd.). The acid value of the polyurethane compound is preferably 20 to 130 mgKOH / g, and the acid value is preferably 40 to 110 mgKOH / g.
The acid value can be measured by the following method. First, after precisely weighing about 1 g of the measurement resin solution, 30 g of acetone is added to the resin solution to uniformly dissolve the resin solution. Next, an appropriate amount of phenolphthalein as an indicator is added to the solution, and titration is performed using a 0.1N aqueous KOH solution. And from the titration result, the following general formula (1);
A = 10 × Vf × 56.1 / (Wp × I) (1)
To calculate the acid value. In the formula, A represents the acid value (mgKOH / g), Vf represents the titration amount (mL) of a 0.1N KOH aqueous solution, Wp represents the weight of the measurement resin solution (g), and I represents the measurement resin solution. The ratio (% by mass) of the nonvolatile content of
The weight average molecular weight Mw is Mw 3000 to 100,000, preferably Mw 5000 to 50000, and more preferably Mw 7000 to 20000.
The weight average molecular weight (Mw) can be measured by gel permeation chromatography (GPC) (in terms of standard polystyrene).

Moreover, as a photosensitive prepolymer of this invention, it has an ethylenically unsaturated group in a side chain, and an ethylenically unsaturated group density | concentration is 1.0 * 10 < ^-5 > -6.0 * 10 < ^-3 > mol / g. Moreover, it is also possible to use a radical polymerizable copolymer having a total content of chlorine and hydrolyzable chlorine of 100 ppm or less.

  The copolymer component of the radical polymerizable copolymer used in the present invention preferably has a repeating unit derived from maleimide or a maleimide derivative. Specifically, maleimide, ethylmaleimide, butylmaleimide, octylmaleimide, cyclohexylmaleimide, hydroxyethylmaleimide, hydroxybutylmaleimide, ethoxyethylmaleimide, cyclohexylmaleimide, phenylmaleimide, methylphenylmaleimide, hydroxyphenylmaleimide, carboxy Examples thereof include phenylmaleimide, methoxyphenylmaleimide, benzylmaleimide and the like. The repeating unit derived from this maleimide or maleimide derivative is preferably 5% or more and 60% or less, and more preferably 10% or more and 50% or less. When it is 5% or less, the heat resistance of the resin tends to be insufficient, and when it is 60% or more, the adhesion of the resin is lowered and the resin tends to be hard and brittle.

In addition, the copolymerization component is not particularly limited. For example, 2-carboxyethyl methacrylate, ethylenically unsaturated carboxylic acid such as maleic anhydride, methyl methacrylate, ethyl methacrylate, isopropyl methacrylate, n-butyl methacrylate , Methacrylates such as isobutyl methacrylate, n-hexyl methacrylate, 2-ethylhexyl methacrylate, lauryl methacrylate, glycidyl acrylate, glycidyl methacrylate, acrylonitrile, methacrylonitrile, acrylamide, methacrylamide, aminomethyl methacrylate Aminoalkyl methacrylate such as N-methylaminomethyl methacrylate, N, N-dimethylaminomethyl methacrylate, N-methylaminomethyl acrylate, N, N-dimethyl methacrylate Acrylic acid aminoalkyl such as aminoethyl, styrene, vinyl toluene, styrene based monomers such as α- methylstyrene, vinyl acetate, and the like.
Further, the acid value of (a) of the acrylic polymer is preferably 20 (mgKOH / g) or more, particularly preferably 40 to 150 (mgKOH / g). The weight average molecular weight is Mw 5000 to 150,000, preferably in the range of Mw 8000 to 100,000, and more preferably in the range of Mw 10,000 to 50,000.

  As the polymer component used in the present invention, in addition to the photosensitive prepolymer, a polymer having a carboxyl group and a weight average molecular weight Mw of 20000 to 150,000 having no ethylenically unsaturated group may be used. As long as the resin has a carboxyl group, a known resin such as acrylic, polyurethane, epoxy, phenoxy, polyester, polyamide, polyimide, polyamideimide, polyesterimide, polycarbonate, melamine resin, polyphenylene sulfide, polyoxybenzoyl, etc. Alternatively, the acid-modified resin can be used, but the total content of chlorine and hydrolyzable chlorine must be 100 ppm or less as the photosensitive resin composition. Desirably, from the viewpoints of purity and compatibility with the photosensitive prepolymer, the radically polymerizable acrylic copolymer preferably has an acid value of 30 to 170 mgKOH / g, and further has an acid value of 40 to 140 mg / g. It is preferable that

Here, the acrylic copolymer is a vinyl-based copolymer compound obtained as a copolymer component such as (meth) acrylic acid or (meth) acrylic acid alkyl ester.
Examples of the (meth) acrylic acid alkyl ester include (meth) acrylic acid methyl ester, (meth) acrylic acid ethyl ester, (meth) acrylic acid butyl ester, (meth) acrylic acid 2-ethylhexyl ester, and the like. Examples of vinyl monomers that can be copolymerized with (meth) acrylic acid alkyl ester and (meth) acrylic acid include (meth) acrylic acid tetrahydrofurfuryl ester, (meth) acrylic acid dimethylaminoethyl ester, (meth) Diethylaminoethyl acrylate, glycidyl methacrylate, 2,2,2-trifluoroethyl (meth) acrylate, 2,2,3,3-tetrafluoropropyl (meth) acrylate acrylamide, diacetone acrylamide, styrene, vinyltoluene Etc.
Moreover, an acrylic acrylate having an ethylenically unsaturated group can also be used as the vinyl copolymer compound.

  Examples of the photopolymerizable monomer having at least one ethylenically unsaturated group in the molecule used as the component (B) in the present invention include bisphenol A (meth) acrylate compounds; α, β- A compound obtained by reacting an unsaturated carboxylic acid; a compound obtained by reacting a glycidyl group-containing compound with an α, β-unsaturated carboxylic acid; a urethane monomer such as a (meth) acrylate compound having a urethane bond in the molecule; In addition to these, urethane oligomers may be used. Nonylphenoxypolyoxyethylene acrylate; γ-chloro-β-hydroxypropyl-β ′-(meth) acryloyloxyethyl-o-phthalate, β-hydroxyalkyl-β ′-( Preparation of phthalic acid such as (meth) acryloyloxyalkyl-o-phthalate Things; (meth) acrylic acid alkyl esters, EO-modified nonylphenyl (meth) acrylate or the like can be exemplified. These may be used alone or in combination of two or more.

Examples of bisphenol A-based (meth) acrylate compounds include 2,2-bis (4-((meth) acryloxypolyethoxy) phenyl) propane and 2,2-bis (4-((meth) acryloxypolypropoxy). ) Phenyl) propane, 2,2-bis (4-((meth) acryloxypolybutoxy) phenyl) propane, 2,2-bis (4-((meth) acryloxypolyethoxypolypropoxy) phenyl) propane, etc. Can be mentioned.
Examples of 2,2-bis (4-((meth) acryloxypolyethoxy) phenyl) propane include 2,2-bis (4-((meth) acryloxydiethoxy) phenyl) propane, 2,2- Bis (4-((meth) acryloxytriethoxy) phenyl) propane, 2,2-bis (4-((meth) acryloxytetraethoxy) phenyl) propane, 2,2-bis (4-((meth)) Acryloxypentaethoxy) phenyl) propane, 2,2-bis (4-((meth) acryloxyhexaethoxy) phenyl) propane, 2,2-bis (4-((meth) acryloxyheptaethoxy) phenyl) propane 2,2-bis (4-((meth) acryloxyoctaethoxy) phenyl) propane, 2,2-bis (4-((meth) acryloxy nonaethoxy) ) Phenyl) propane, 2,2-bis (4-((meth) acryloxydecaethoxy) phenyl), 2,2-bis (4-((meth) acryloxyundecaethoxy) phenyl), 2,2- Bis (4-((meth) acryloxydodecaethoxy) phenyl), 2,2-bis (4-((meth) acryloxytridecaethoxy) phenyl), 2,2-bis (4-((meth) acrylic) Loxytetradecaethoxy) phenyl), 2,2-bis (4-((meth) acryloxypentadecaethoxy) phenyl), 2,2-bis (4-((meth) acryloxyhexadecaethoxy) phenyl), etc. 2,2-bis (4- (methacryloxypentaethoxy) phenyl) propane is commercially available as BPE-500 (product name, manufactured by Shin-Nakamura Chemical Co., Ltd.) An ability, 2,2-bis (4- (methacryloxy pentadecanoyl) phenyl) is, BPE-1300 (trade name, Chemical Industry Co., Ltd. Shin-Nakamura) is commercially available as. These can be used alone or in combination of two or more.

  Examples of 2,2-bis (4-((meth) acryloxypolypropoxy) phenyl) propane include 2,2-bis (4-((meth) acryloxydipropoxy) phenyl) propane, 2,2- Bis (4-((meth) acryloxytripropoxy) phenyl) propane, 2,2-bis (4-((meth) acryloxytetrapropoxy) phenyl) propane, 2,2-bis (4-((meth)) Acryloxypentapropoxy) phenyl) propane, 2,2-bis (4-((meth) acryloxyhexapropoxy) phenyl) propane, 2,2-bis (4-((meth) acryloxyheptapropoxy) phenyl) propane 2,2-bis (4-((meth) acryloxyoctapropoxy) phenyl) propane, 2,2-bis (4-((meth) acrylic) Xinonapropoxy) phenyl) propane, 2,2-bis (4-((meth) acryloxydecapropoxy) phenyl), 2,2-bis (4-((meth) acryloxyundecapropoxy) phenyl), 2 , 2-bis (4-((meth) acryloxydodecapropoxy) phenyl), 2,2-bis (4-((meth) acryloxytridecapropoxy) phenyl), 2,2-bis (4-(( (Meth) acryloxytetradecapropoxy) phenyl), 2,2-bis (4-((meth) acryloxypentadecapropoxy) phenyl), 2,2-bis (4-((meth) acryloxyhexadecapropoxy) Phenyl) and the like. These may be used alone or in combination of two or more.

  Examples of 2,2-bis (4-((meth) acryloxypolyethoxypolypropoxy) phenyl) propane include 2,2-bis (4-((meth) acryloxydiethoxyoctapropoxy) phenyl) propane, Examples include 2,2-bis (4-((meth) acryloxytetraethoxytetrapropoxy) phenyl) propane and 2,2-bis (4-((meth) acryloxyhexaethoxyhexapropoxy) phenyl) propane. These can be used alone or in combination of two or more.

Examples of the compound obtained by reacting a polyhydric alcohol with an α, β-unsaturated carboxylic acid include, for example, polyethylene glycol di (meth) acrylate having 2 to 14 ethylene groups and 2 to 14 propylene groups. Polypropylene glycol di (meth) acrylate, polyethylene polypropylene glycol di (meth) acrylate having 2 to 14 ethylene groups and 2 to 14 propylene groups, trimethylolpropane di (meth) acrylate, tri Methylolpropane tri (meth) acrylate, EO-modified trimethylolpropane tri (meth) acrylate, PO-modified trimethylolpropane tri (meth) acrylate, EO / PO-modified trimethylolpropane tri (meth) acrylate, tetramethylolmethanetri (meth) A Examples thereof include acrylate, tetramethylolmethane tetra (meth) acrylate, dipentaerythritol penta (meth) acrylate, and dipentaerythritol hexa (meth) acrylate. These may be used alone or in combination of two or more.
“EO” refers to “ethylene oxide”, and “PO” refers to “propylene oxide”. Further, “EO modified” means having a block structure of ethylene oxide units (—CH ₂ —CH ₂ —O—), and “PO modified” means propylene oxide units (—CH ₂ (CH ₃ ) —CH. It means having a _2- O-) block structure.

Examples of the compound obtained by reacting a glycidyl group-containing compound with an α, β-unsaturated carboxylic acid include trimethylolpropane triglycidyl ether tri (meth) acrylate, 2,2-bis (4- (meth) acryloxy- 2-hydroxy-propyloxy) phenyl and the like are fisted.
Examples of the α, β-unsaturated carboxylic acid include (meth) acrylic acid.

  Examples of urethane monomers include (meth) acrylic monomers having an OH group at the β-position and diisocyanate compounds such as isophorone diisocyanate, 2,6-toluene diisocyanate, 2,4-toluene diisocyanate, and 1,6-hexamethylene diisocyanate. Additional reaction products, tris ((meth) acryloxytetraethylene glycol isocyanate) hexamethylene isocyanurate, EO-modified urethane di (meth) acrylate, EO or PO-modified urethane di (meth) acrylate, and the like can be mentioned.

Furthermore, examples of the (meth) acrylic acid alkyl ester include (meth) acrylic acid methyl ester, (meth) acrylic acid ethyl ester, (meth) acrylic acid butyl ester, (meth) acrylic acid 2-ethylhexyl ester, and the like. It is done.
These (B) components are used individually by 1 type or in combination of 2 or more types.

  The photopolymerization initiator used as the component (C) in the present invention is not particularly limited, and examples thereof include benzophenone, N, N′-tetraalkyl-4,4′-diaminobenzophenone, 2-benzyl-2-dimethylamino- Aromatic ketones such as 1- (4-morpholinophenyl) -butanone-1,2-methyl-1- [4- (methylthio) phenyl] -2-morpholino-propanone-1, 4,4′-bis (dimethylamino) ) Benzophenone (Mihera ketone), 4,4′-bis (diethylamino) benzophenone, 4-methoxy-4′-dimethylaminobenzophenone, 2-benzyl-2-dimethylamino-1-morpholinophenone) -butanone-1,2-ethyl Aromatic ketones such as anthraquinone and phenanthrenequinone, benzoin methyl ether, Benzoin ether such as inethyl ether and benzoin phenyl ether, benzoin such as methyl benzoin and ethyl benzoin, benzyl derivatives such as benzyl dimethyl ketal, 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, 2,4-di (p-methoxyphenyl) -5-phenylimidazole dimer, 2- (2,4-dimethoxyphenyl) -4,5-diphenylimidazole dimer, etc. 2,4,5-triarylimidazole dimer, 9-phenylacridine, 1, - bis (9,9'-acridinyl) acridine derivatives such as heptane, N- phenylglycine, N- phenylglycine derivatives, coumarin-based compounds. These can be used alone or in combination of two or more.

(D) High purity epoxy resin having a chlorine content of 200 ppm or less and a hydrolyzable chlorine content of 500 ppm or less used in the present invention is generally obtained by reacting epichlorohydrin. However, the amount of chlorine and hydrolyzable chlorine generated as impurities during the reaction is low. Specifically, in the present invention, those having a chlorine content of 200 ppm or less and a hydrolyzable chlorine content of 500 ppm or less are used.
Hydrolyzable chlorine refers to those that readily hydrolyze in the presence of water to generate chloride ions. Dissolve the resin in a solvent and treat with alkali for a specified temperature for a specified time to decompose the chlorine. The salt generated can be quantified by potentiometric titration.

  Examples of commercially available epoxy resins include YD-8125, YDF-8170C, ZX-1059, YD-825GS, YDF-870GS, ZX-1658, and ZX-1627 (product names), which are purified by molecular distillation. , Manufactured by Toto Kasei Co., Ltd.), YX-8000, YX-8034 (product name, manufactured by Japan Epoxy Resin Co., Ltd.), N-655EXP-S, N-665EXP, N-670EXP-S, N-672EXP, N-685EXP -S (product name, manufactured by Dainippon Ink Chemical Co., Ltd.), R140P, R140S, R140Q (product name, manufactured by Mitsui Chemicals), ED-509S, ED-518S (manufactured by ADEKA Corporation), and the like. The epoxy resin used in the present invention is not limited to the above as long as it has a high purity. Moreover, it is desirable to use the epoxy resin which is solid at room temperature (25 ° C.) and has a softening point of 30 ° C. to 100 ° C., more preferably a softening point of 50 ° C. to 100 ° C.

The (E) curing accelerator used in the present invention is not particularly limited, and examples thereof include dicyandiamide, benzyldimethylamine, 4- (dimethylamino) -N, N-dimethylbenzylamine, 4-methoxy-N, N-dimethyl. Amine compounds such as benzylamine and 4-methyl-N, N-dimethylbenzylamine; quaternary ammonium salt compounds such as triethylbenzylammonium chloride; blocked isocyanate compounds such as dimethylamine; imidazole, 2-methylimidazole and 2-ethylimidazole Derivatives of 2-ethyl-4-methylimidazole, 2-ethylimidazole, 2-phenylimidazole, 4-phenylimidazole, 1-cyanoethyl-2-phenylimidazole, 1- (2-cyanoethyl) -2-ethyl-4-methylimidazole, etc. Bicyclic amidine compounds and salts thereof; phosphorus compounds such as triphenylphosphine; guanamine compounds such as melamine, guanamine, acetoguanamine, benzoguanamine; 2,4-diamino-6-methacryloyloxyethyl-S-triazine, 2-vinyl- 2,4-diamino-s-triazine, 2-vinyl-4,6-diamino-s-triazine / isocyanuric acid adduct, 2,4-diamino-6-methacryloyloxyethyl-s-triazine / isocyanuric acid adduct, etc. S-triazine derivative, boron trifluoride-amine complex, organic hydrazide series, phthalic anhydride, trimellitic anhydride, ethylene glycol bis (anhydro trimellitate), glycerol tris (anhydro trimellitate), benzophenone tetra Carvone Aromatic acid anhydrides such as anhydrides, aliphatic acid anhydrides such as maleic anhydride and tetrahydrophthalic anhydride, polyphenols such as polyvinylphenol, polyvinylphenol bromide, phenol novolac and alkylphenol novolac can be used. . Among these, dicyandiamide, imidazole, 2-methylimidazole, 2-ethylimidazole, 2-vinyl-4,6-diamino-s-triazine / isocyanuric acid adduct and the like are preferable. These may be used alone or in combination of two or more.
The amount used is preferably 0.1 to 10% by weight based on 100 parts by weight of the total amount of the component (A) and the component (B).

Moreover, in this invention, you may contain the polyfunctional maleimide compound which has at least 2 or more (F) maleimide in a molecule | numerator as a crosslinking agent.
Examples of polyfunctional maleimide compounds containing at least two maleimide groups in the molecule include 1-methyl-2,4-bismaleimidebenzene, N, N′-m-phenylenebismaleimide, N, N′-p. -Phenylene bismaleimide, N, N'-m-toluylene bismaleimide, N, N'-4,4'-biphenylene bismaleimide, N, N'-4,4 '-[3,3'-dimethyl-biphenylene Bismaleimide, N, N′-4,4 ′-[3,3′-dimethyldiphenylmethane] bismaleimide, N, N′-4,4 ′-[3,3′-diethyldiphenylmethane] bismaleimide, N, N′-4,4′-diphenylmethane bismaleimide, N, N′-4,4′-diphenylpropane bismaleimide, N, N′-4,4′-diphenyl ether bismaleimide, N, N′-3, '-Diphenylsulfone bismaleimide, N, N'-4,4'-diphenylsulfone bismaleimide, 2,2-bis [4- (4-maleimidophenoxy) phenyl] propane, 2,2-bis [3-t- Butyl-4- (4-maleimidophenoxy) phenyl] propane, 2,2-bis [3-s-butyl-4- (4-maleimidophenoxy) phenyl] propane, 1,1-bis [4- (4-maleimide) Phenoxy) phenyl] decane, 1,1-bis [2-methyl-4- (4-maleimidophenoxy) -5-t-butylphenyl] -2-methylpropane, 4,4′-cyclohexylidene-bis [1 -(4-maleimidophenoxy) -2- (1,1-dimethylethyl) benzene], 4,4'-methylene-bis [1- (4-maleimidophenoxy) -2,6- Bis (1,1-dimethylethyl) benzene], 4,4′-methylene-bis [1- (4-maleimidophenoxy) -2,6-di-s-butylbenzene], 4,4′-cyclohexylidene -Bis [1- (4-maleimidophenoxy) -2-cyclohexylbenzene, 4,4'-methylenebis [1- (maleimidophenoxy) -2-nonylbenzene], 4,4 '-(1-methylethylidene) -bis [1- (maleimidophenoxy) -2,6-bis (1,1-dimethylethyl) benzene], 4,4 ′-(2-ethylhexylidene) -bis [1- (maleimidophenoxy) -benzene], 4,4 ′-(1-methylheptylidene) -bis [1- (maleimidophenoxy) -benzene], 4,4′-cyclohexylidene-bis [1- (maleimidophenoxy) -3-methyl Tylbenzene], 2,2-bis [4- (4-maleimidophenoxy) phenyl] propane, 2,2-bis [4- (4-maleimidophenoxy) phenyl] hexafluoropropane, 2,2-bis [3-methyl -4- (4-maleimidophenoxy) phenyl] propane, 2,2-bis [3-methyl-4- (4-maleimidophenoxy) phenyl] hexafluoropropane, 2,2-bis [3,5-dimethyl-4 -(4-maleimidophenoxy) phenyl] propane, 2,2-bis [3,5-dimethyl-4- (4-maleimidophenoxy) phenyl] hexafluoropropane, 2,2-bis [3-ethyl-4-4 -Maleimidophenoxy) phenyl] propane, 2,2-bis [3-ethyl-4- (4-maleimidophenoxy) phenyl] hexaph Olopropane, bis [3-methyl- (4-maleimidophenoxy) phenyl] methane, bis [3,5-dimethyl- (4-maleimidophenoxy) phenyl] methane, bis [3-ethyl- (4-maleimidophenoxy) phenyl] Methane, 3,8-bis [4- (4-maleimidophenoxy) phenyl] -tricyclo- [5,2,1,02.6] decane, 4,8-bis [4- (4-maleimidophenoxy) phenyl] -Tricyclo- [5,2,1,02.6] decane, 3,9-bis [4- (4-maleimidophenoxy) phenyl] -tricyclo- [5,2,1,02.6] decane, 4, 9-bis [4- (4-maleimidophenoxy) phenyl] -tricyclo- [5,2,1,022.6] decane, 1,8 bis [4- (4-maleimidophenoxy) Nenyl] menthane, 1,8bis [3-methyl-4- (4-maleimidophenoxy) phenyl] menthane, 1,8-bis [3,5-dimethyl-4- (4-maleimidophenoxy) phenyl] menthane, etc. Can be mentioned. These can be used alone or in combination.

  When the polyfunctional maleimide is used, it is desirable to use an organic peroxide in combination as a component for initiating the reaction of maleimide and imparting latency. It is desirable to select one that generates radicals at the temperature at which the reaction is desired to start. Examples of the organic peroxide used in the present invention include t-butylcumyl peroxide, dicumyl peroxide, α, α′-bis (t-butylperoxy-m-isopropyl) benzene, and 2,5-dimethyl. Preferred examples include -2,5-di (t-butylperoxy) hexane and 2,5-dimethyl-2,5-di (t-butylperoxy) hexyne-3. AIBN, di-t-butyl peroxide, acetyl peroxide and the like are not preferable because of their low decomposition temperatures and poor storage stability and cured properties. The addition amount of the organic peroxide is preferably 0.1 to 10 parts by weight with respect to 20 parts by weight of the polyfunctional maleimide. More preferably, it is 0.4-5 weight part. When the amount is less than 0.1 parts by weight, curing is not completed in a short time and the cured product becomes non-uniform, which is not preferable. If it is used in an amount exceeding 10 parts by weight, the cured physical properties are lowered by the organic peroxide remaining without being decomposed or decomposed.

  In the photosensitive resin composition of the present invention, it is effective to further add (G) an elastomer that is not completely compatible with the photosensitive prepolymer, if necessary. By including an elastomer in the photosensitive resin composition, it is possible to improve the adhesion to the conductor layer, and further improve the heat resistance, flexibility and toughness of the photosensitive resin composition after curing. It becomes possible to make it. Examples of the elastomer include styrene elastomers, olefin elastomers, urethane elastomers, polyester elastomers, polyamide elastomers, acrylic elastomers, and silicone elastomers. Examples of the styrene elastomer include styrene-butadiene-styrene block copolymer, styrene-isoprene-styrene block copolymer, styrene-ethylene-butylene-styrene block copolymer, and styrene-ethylene-propylene-styrene block copolymer. As the styrene component in the styrene elastomer, styrene derivatives such as α-methylstyrene, 3-methylstyrene, 4-propylstyrene, 4-cyclohexylstyrene and the like can be used in addition to styrene. Styrene-based elastomers are commercially available from Tufrene, Solprene T, Asaprene T, Tuftec (made by Asahi Kasei Co., Ltd.), Elastomer AR (made by Aron Kasei Co., Ltd.), Clayton G, Califlex (above, Shell Japan Co., Ltd.) Manufactured by JSR-TR, TSR-SIS, Dynalon (manufactured by Nippon Synthetic Rubber Co., Ltd.), Denka STR (manufactured by Denki Kagaku Kogyo Co., Ltd.), Quintac (manufactured by Nippon Zeon Co., Ltd.), TPE-SB series (Sumitomo) Chemical Co., Ltd.), Lavalon (Mitsubishi Chemical Co., Ltd.), Septon, Hibler (above, Kuraray Co., Ltd.), Sumiflex (Sumitomo Bakelite Co., Ltd.), Rheostoma, Actimer (above, Riken Vinyl Industry Co., Ltd.) ) Etc. Examples of olefinic elastomers include homopolymers or copolymers of 2 to 20 carbon atoms such as ethylene, propylene, 1-butene, 1-hexene and 4-methyl-pentene; ethylene-propylene copolymers (EPR) Ethylene-propylene-diene copolymer (EPDM); dicyclopentadiene, 1,4-hexadiene, cyclooctanediene, methylene norbornene, ethylidene norbornene, butadiene, isoprene, and the like, and α-olefin A copolymer of methacrylic acid and a butadiene-acrylonitrile copolymer; an ethylene-α-olefin copolymer rubber; an ethylene-α-olefin-nonconjugated diene copolymer rubber; a propylene-α- Olefin copolymer rubber, butene-α-olefin Polymer rubber and the like. Olefin-based elastomers are commercially available as milastoma (manufactured by Mitsui Petrochemical Co., Ltd.), EXACT (manufactured by Exxon Chemical Co., Ltd.), ENGAGE (manufactured by Dow Chemical Co., Ltd.), DYNABON HSBR, which is a hydrogenated styrene-butadiene copolymer, and butadiene. -The NBR series which is an acrylonitrile copolymer, the XER series (which is manufactured by Nippon Synthetic Rubber Co., Ltd.) which is a carboxyl group-modified butadiene-acrylonitrile copolymer having a crosslinking point, and the like. The urethane elastomer is composed of a hard segment composed of a short-chain diol and diisocyanate and a soft segment composed of a long-chain diol and diisocyanate. As long chain diols, polypropylene glycol, polytetramethylene oxide, poly (1,4-butylene adipate), poly (ethylene-1,4-butylene adipate), polycaprolactone, poly (1,6-hexylene carbonate), Examples thereof include poly (1,6-hexylene-neopentylene adipate), and the number average molecular weight of the long-chain diol is preferably 500 to 10,000.

  Examples of the short chain diol include ethylene glycol, propylene glycol, 1,4-butanediol, bisphenol A and the like, and the number average molecular weight of the short chain diol is preferably 48 to 500. The urethane-based elastomer is commercially available as PANDEX T-2185, T-2983N (manufactured by Dainippon Ink & Chemicals, Inc.) and the like. The polyester-based elastomer is an elastomer obtained by polycondensation of a dicarboxylic acid or a derivative thereof and a diol compound or a derivative thereof. Dicarboxylic acids include terephthalic acid, isophthalic acid, naphthalenedicarboxylic acid and aromatic dicarboxylic acids in which these aromatic rings are substituted with methyl, ethyl, phenyl, etc .; carbon such as adipic acid, sebacic acid, dodecanedicarboxylic acid, etc. Examples thereof include aliphatic dicarboxylic acids of 2 to 20; alicyclic dicarboxylic acids such as cyclohexanedicarboxylic acid, and one or more of these compounds can be used.

Examples of the diol compound include aliphatic or alicyclic compounds such as ethylene glycol, 1,3-propanediol, 1,4-butanediol, 1,6-hexanediol, 1,10-decanediol, and 1,4-cyclohexanediol. Diol; bisphenol A, bis- (4-hydroxyphenyl) -methane, bis- (4-hydroxy-3-methylphenyl) -propane, resorcin, etc. can be exemplified, and one or more of these compounds should be used Can do.
Further, a multi-block copolymer having an aromatic polyester (for example, polybutylene terephthalate) as a hard segment component and an aliphatic polyester (for example, polytetramethylene glycol) as a soft segment component can be used. The above polyester elastomer is commercially available as Hytrel (DuPont-Toray Industries, Inc.), Perprene (Toyobo Co., Ltd.), Espel (Hitachi Chemical Industries, Ltd.), and the like. Polyamide elastomers are elastomers composed of a hard segment made of polyamide and a soft segment made of polyether or polyester, and are roughly divided into two types: polyether block amide type and polyether ester block amide type. The

  Examples of the polyamide include polyamide 6, polyamide 11, and polyamide 12, and examples of the polyether include polyoxyethylene, polyoxypropylene, and polytetramethylene glycol. The above-mentioned polyamide elastomers are commercially available from UBE polyamide elastomer (manufactured by Ube Industries), Daiamide (manufactured by Daicel Huls), PEBAX (manufactured by Toray Industries, Inc.), Grilon ELY (manufactured by MMS Japan Co., Ltd.), Novamid (Mitsubishi Chemical Co., Ltd.), Glease (Dainippon Ink Chemical Co., Ltd.), etc. Acrylic elastomers are acrylic esters such as ethyl acrylate, butyl acrylate, methoxyethyl acrylate, and ethoxyethyl acrylate, and monomers having an epoxy group such as glycidyl methacrylate and allyl glycidyl ether, and / or vinyl such as acrylonitrile and ethylene. It is an elastomer obtained by copolymerizing with a monomer.

  Examples of the acrylic elastomer include acrylonitrile-butyl acrylate copolymer, acrylonitrile-butyl acrylate-ethyl acrylate copolymer, acrylonitrile-butyl acrylate-glycidyl methacrylate copolymer, and the like. The silicone elastomer is an elastomer mainly composed of an organopolysiloxane, and examples thereof include polydimethylsiloxane-based, polymethylphenylsiloxane-based, and polydiphenylsiloxane-based silicone elastomers. An elastomer obtained by modifying an organopolysiloxane with a vinyl group or an alkoxy group may be used. Silicone elastomers are commercially available as KE series (manufactured by Shin-Etsu Chemical Co., Ltd.) SE series, CY series, SH series (above, manufactured by Toray Dow Corning Silicone). In addition to the above-described elastomers, rubber-modified epoxy resins, epoxy resins obtained by kneading the above-described elastomer particles, and the like can be used. The rubber-modified epoxy resin is obtained by modifying at least part of the epoxy group of the epoxy resin with a both-end carboxyxyl group-modified butadiene-acrylonitrile copolymer, a terminal amino-modified silicone rubber or the like. Furthermore, as an elastomer, the both-ends carboxyl group-modified butadiene-acrylonitrile copolymer and Esper (Esper 1612, Esper 1620, manufactured by Hitachi Chemical Co., Ltd.) which is a polyester elastomer can be used. These are preferably selected in consideration of compatibility with the photosensitive prepolymer used. The amount used is preferably 0.5 to 10% by weight based on 100 parts by weight of the total amount of the component (A) and the component (B).

  Moreover, in this invention, (H) inorganic filler can be used as needed in order to improve characteristics, such as adhesiveness and hardness. For example, inorganic fillers such as barium sulfate, barium titanate, powdered silicon oxide, amorphous silica, 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 70% by weight.

  If necessary, use colorants such as phthalocyanine blue, phthalocyanine green, iodine green, disazo yellow, malachite green, crystal violet, titanium oxide, carbon black, naphthalene black, azo organic pigments, dyes, etc. it can. Furthermore, polymerization inhibitors such as hydroquinone, hydroquinone monomethyl ether, tert-butylcatechol, pyrogallol and phenothiazine, thixotropic agents such as benton, montmorillonite, aerosil and amide wax, antifoaming agents such as silicone, fluorine and polymer Leveling agents can be used.

The content of the diluent used in the present invention is preferably 5 to 40% by weight based on the total weight when the photosensitive resin composition is used in a liquid state. When applied to a support and used as a photosensitive film, it is contained in an amount of 30 to 70% by weight based on the total weight in the varnish state before coating. Then, since it is made to volatilize in the drying process at the time of film preparation after setting it as a film, the residual rate of a diluent will be 3 weight% or less.
Examples of the diluent include aliphatic alcohols such as methanol, ethanol, n-propanol, i-propanol, n-butanol, n-pentanol and hexanol, hydrocarbons such as benzyl alcohol and cyclohexane, diacetone alcohol, Aliphatic ketones such as 3-methoxy-1-butanol, acetone, methyl ethyl ketone, methyl propyl ketone, diethyl ketone, methyl isobutyl ketone, methyl pentyl ketone, methyl hexyl ketone, ethyl butyl ketone, dibutyl ketone, ethylene glycol, diethylene glycol, tri Ethylene glycol, tetraethylene glycol, propylene glycol, ethylene glycol monoacetate, ethylene glycol diacetate, propylene glycol monoacetate, pro Ethylene glycol alkyl ethers such as lenglycol diacetate, propylene glycol monoethyl ether, methyl cellosolve, ethyl cellosolve, butyl cellosolve, phenyl cellosolve, ethylene glycol dimethyl ether, ethylene glycol diethyl ether, ethylene glycol dibutyl ether, methyl cellosolve acetate, ethyl cellosolve acetate And its acetate, diethylene glycol monoalkyl ether and its acetate diethylene glycol dialkyl ether, triethylene glycol alkyl ether, propylene glycol alkyl ether and its acetate, dipropylene glycol alkyl ether, and toluene, petroleum ether, petroleum naphtha, Hydrogenated petroleum naphtha Or petroleum solvents such as solvent naphtha, ethyl formate, propyl formate, butyl formate, amyl formate, methyl acetate, ethyl acetate, propyl acetate, butyl acetate, methyl propionate, ethyl propionate, methyl butyrate, ethyl butyrate, etc. Acid esters, amines, amides such as N, N-dimethylformamide, N, N-dimethylacetamide, N-methyl-2-pyrrolidone, dimethyl sulfoxide, dioxane, tetrahydrofuran, cyclohexanone, γ-butyrolactone, 3- Solvents such as hydroxy-2-butanone, 4-hydroxy-2-pentanone and 6-hydroxy-2-hexanone can be used alone or in combination of two or more.

  The content of each component in the photosensitive resin composition is such that the component (C) is 0.1 to 30 parts by weight, preferably 0.2 parts per 100 parts by weight in total of the components (A) and (B). More preferably, the component (D) is blended in an amount of 0.5 to 40 parts by weight, preferably 1 to 30 parts by weight.

Next, the photosensitive film of the present invention will be described.
The photosensitive film of this invention is equipped with a support body and the photosensitive resin composition layer which consists of the photosensitive resin composition of this invention formed on this support body. On the photosensitive resin composition layer, you may further provide the protective film which coat | covers this photosensitive resin composition layer.
The photosensitive resin composition layer is prepared by dissolving the photosensitive resin composition of the present invention in the above solvent (diluent) or mixed solvent to obtain a solution having a solid content of about 30 to 80% by weight. It is preferable to form by coating. Although the thickness of the photosensitive resin composition layer varies depending on the use, it is preferably 10 to 100 μm and more preferably 20 to 60 μm in thickness after drying after removing the solvent by heating and / or hot air blowing. . If the thickness is less than 10 μm, there is a tendency that it is difficult to apply industrially, and if it exceeds 100 μm, the above-described effects produced by the present invention tend to be reduced, and in particular, physical properties and resolution tend to be reduced.
Examples of the support provided in the photosensitive film include polymer films having heat resistance and solvent resistance such as polyethylene terephthalate, polypropylene, polyethylene, and polyester.
The thickness of the support is preferably 5 to 100 μm, and more preferably 10 to 30 μm. If the thickness is less than 5 μm, the support tends to be broken when the support is peeled off before development, and if it exceeds 100 μm, the resolution and flexibility tend to decrease. In the present invention, since the photosensitive resin composition layer is formed using the modified epoxy resin as described above, when the thickness of the support is thicker than the conventional one, for example, when it is more than 25 μm and 100 μm or less. Even so, the flexibility and resolution can be maintained.
The photosensitive film consisting of two layers of the support and the photosensitive resin composition layer as described above or the photosensitive film consisting of three layers of the support, the photosensitive resin composition layer, and the protective film, for example, is stored as it is. Alternatively, the protective film may be interposed and wound around the core in a roll shape and stored.

The method for forming a resist pattern using the photosensitive resin composition or photosensitive film of the present invention is as follows. First, a known screen printing, a step of applying by a roll coater, or a step of applying by lamination or the like, respectively. Is laminated on the substrate to form Next, if necessary, a removal process for removing the protective film from the photosensitive film described above is performed, and an actinic ray is irradiated to a predetermined portion of the photosensitive resin composition layer through the mask pattern, thereby exposing the photosensitive resin of the irradiated portion. An exposure step for photocuring the composition layer is performed. The photosensitive resin composition layer other than the irradiated part is removed by the next development step. In addition, the board | substrate which forms a resist points out a printed wiring board, a board | substrate for semiconductor packages, and a flexible wiring board.
As the light source of actinic light, a known light source such as a carbon arc lamp, a mercury vapor arc lamp, an ultrahigh pressure mercury lamp, a high pressure mercury lamp, or a xenon lamp that emits ultraviolet rays effectively is used. Moreover, what emits visible light effectively, such as a photographic flood light bulb and a solar lamp, is also used.

In the development step, an alkaline developer such as a dilute solution (1 to 5% by weight aqueous solution) of sodium carbonate at 20 to 50 ° C. is used as a developer, and known spraying, rocking immersion, brushing, scraping, etc. Develop by the method of.
After the development step, it is preferable to perform ultraviolet irradiation or heating with a high-pressure mercury lamp for the purpose of improving solder heat resistance, chemical resistance, and the like. In the case of irradiating ultraviolet rays, the irradiation amount can be adjusted as necessary. For example, the irradiation can be performed at an irradiation amount of about 0.2 to 10 J / cm ² . Moreover, when heating a resist pattern, it is preferable to carry out for about 15 to 90 minutes in the range of about 100-170 degreeC. Furthermore, ultraviolet irradiation and heating can be performed at the same time, and after either one is performed, the other can be performed. When performing ultraviolet irradiation and heating simultaneously, it is more preferable to heat to 60 to 150 ° C. from the viewpoint of effectively imparting solder heat resistance, chemical resistance and the like.
This photosensitive resin composition layer also serves as a protective film for wiring after soldering to the substrate, and has excellent crack resistance, HAST resistance, and gold plating properties, so for printed wiring boards and semiconductor package substrates It is effective as a solder resist for flexible wiring boards.
The substrate provided with the resist pattern in this manner is then mounted with a semiconductor element or the like (for example, wire bonding or solder connection) and then mounted on an electronic device such as a personal computer.

EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples, but the present invention is not limited to these examples.
(Examples 1-4, Comparative Examples 1-3)
The photosensitive resin composition solution was obtained by mixing each component shown in Table 1 with the compounding ratio (mass basis) of the solid content shown there. In the table, resin (2) is a carboxyl group-containing acrylic polymer, which is a copolymer of methacrylic acid, methyl methacrylate, and butyl acrylate, and has a weight average molecular weight of 100,000 and an acid value of 110 mgKOH / g.
Other commercially available materials include polyurethane compounds (UXE-3024, manufactured by Nippon Kayaku Co., Ltd.), bisphenol A polyoxyethylene dimethacrylate (FA-321M, manufactured by Hitachi Chemical Co., Ltd., trade name), dipentaerythritol hexaacrylate. (DPHA, Nippon Kayaku Co., Ltd., trade name), 2-benzyl-2-dimethylamino-1- (4-morpholinophenyl) -butanone-1 (I-369, manufactured by Ciba Specialty Chemicals Co., Ltd.) Name), bisphenol A type epoxy resin (Epototo YD-8125, manufactured by Tohto Kasei Co., Ltd., trade name), cresol novolac type epoxy resin (Epicron N-685EXP-S, manufactured by Dainippon Ink & Chemicals, Inc., trade name), Methyl ethyl ketone was used as the diluent.

“UXE-3024”: polyurethane compound (manufactured by Nippon Kayaku Co., Ltd., sample name, weight average molecular weight: 10,000, acid value: 60 mgKOH / g).
“ZFR-1158”: acid-modified bisphenol F type epoxy acrylate (manufactured by Nippon Kayaku Co., Ltd., trade name, weight average molecular weight: 10,000, acid value: 60 mgKOH / g).
“ZAR-2003H”: acid-modified bisphenol A type epoxy acrylate (manufactured by Nippon Kayaku Co., Ltd., trade name, weight average molecular weight: 13000, acid value: 82 mgKOH / g).
“Resin (1)”: carboxyl group-containing acrylic resin (copolymerized methacrylic acid / methyl methacrylate / butyl acrylate, weight average molecular weight 100,000, acid value 110 mgKOH / g)
“FA-321M”: 2,2-bis (4- (methacryloxypentaethoxy) phenyl) propane (trade name, manufactured by Hitachi Chemical Co., Ltd.).
“IRGACURE-369”: 2-benzyl-2-dimethylamino-1- (4-morpholinophenyl) -butanone-1 (trade name, manufactured by Ciba Specialty Chemicals).
“YD8125”: molecularly distilled product, bisphenol A type epoxy resin (trade name, manufactured by Toto Kasei Co., Ltd.)
“YDF-8170C”: molecular distilled product, bisphenol F type epoxy resin (trade name, manufactured by Toto Kasei Co., Ltd.)
“N-685EXP-S”: Cresol novolac type epoxy resin (high purity product, trade name, manufactured by Dainippon Ink & Chemicals, Inc.)
"Epicoat 828": Bisphenol A type epoxy resin (standard product, Japan Epoxy Resin Co., Ltd., trade name)
“YD011”: bisphenol A type epoxy resin (standard product, manufactured by Toto Kasei Co., Ltd., trade name)
“YX4000H”: biphenyl type epoxy resin (trade name, manufactured by Japan Epoxy Resin Co., Ltd.).
“BMI-5100”: 3,3′-dimethyl-5,5′-diethyl-4,4′-diphenylmethane bismaleimide (manufactured by Daiwa Kasei Kogyo Co., Ltd., trade name)
“Variace B-30”: Barium sulfate “Variace B-30” (trade name, manufactured by Sakai Chemical Industry Co., Ltd.)

Next, a photosensitive resin composition layer is formed by uniformly coating this photosensitive resin composition solution on a 16 μm-thick polyethylene terephthalate film (G2-16, trade name, manufactured by Teijin Ltd.) as a support layer. It was dried for about 10 minutes at 100 ° C. using a hot air convection dryer. The film thickness after drying of the photosensitive resin composition layer was 25 μm.
Subsequently, on the surface of the photosensitive resin composition layer opposite to the side in contact with the support layer, a polyethylene film (NF-15, manufactured by Tamapoly Co., Ltd., trade name) is bonded as a protective film, and is photosensitive. A film was obtained.

[Evaluation of coating properties]
Without exposing to the obtained photosensitive film, the polyethylene terephthalate on a photosensitive film was peeled off, the finger | toe was lightly pressed on the coating-film surface, and the sticking degree with respect to the finger was evaluated on the following references | standards. That is, “O” indicates that sticking to the finger is not or hardly recognized, and “X” indicates that sticking to the finger is recognized. The results are shown in Table 2.

[Evaluation of solder heat resistance]
The copper surface of a printed wiring board substrate (E-679, manufactured by Hitachi Chemical Co., Ltd., trade name) obtained by laminating a 12 μm thick copper foil on a glass epoxy substrate was polished with an abrasive brush, washed with water, and dried. On this printed wiring board substrate, using a continuous press type vacuum laminator (MVLP-500, manufactured by Meiki Seisakusho Co., Ltd., trade name), press hot plate temperature 70 ° C., evacuation time 20 seconds, laminating press time 30 seconds. The polyethylene film of the photosensitive film was peeled and laminated under the conditions of an atmospheric pressure of 4 kPa or less and a pressure bonding pressure of 0.4 MPa to obtain a laminate for evaluation.
A photo tool having a 2 mm square pattern as a negative is brought into close contact with the laminate for evaluation, and the remaining steps after development of the stove 21-step tablet using an EXM-1201 type exposure machine manufactured by Oak Manufacturing Co., Ltd. The exposure was performed with an energy amount of 8.0. Next, after standing at room temperature (25 ° C.) for 1 hour, the polyethylene terephthalate on the laminate was peeled off, and a 1% by weight aqueous sodium carbonate solution at 30 ° C. was used for the minimum development time (minimum time for developing the unexposed area). ) Spray development was carried out in 1.5 times the time to form a pattern.
Subsequently, by using an ultraviolet irradiation device manufactured by Oak Manufacturing Co., Ltd., an ultraviolet ray is irradiated with an energy amount of 1 J / cm ² , and further a heat treatment is performed at 160 ° C. for 60 minutes, thereby having a 2 mm square opening. An evaluation laminate substrate on which a resist was formed was obtained.
Next, rosin-based flux (MH-820V, manufactured by Tamura Kaken Co., Ltd., trade name) was applied to the evaluation substrate, and then immersed in a solder bath at 260 ° C. for 30 seconds to perform soldering.
Thus, the crack generation situation of the solder resist on the evaluation board | substrate which gave solder plating, the floating degree of the solder resist from the board | substrate, and the peeling degree were observed visually, and it evaluated by the following reference | standard. In other words, “O” indicates that no cracking of the solder resist was observed and no solder resist was lifted or peeled off, and “X” indicates that any of them was recognized. The results are shown in Table 2.

[Evaluation of gold plating properties]
The laminate substrate for evaluation on which the above-described solder resist was formed was plated using a commercially available electroless nickel / gold plating solution so that the nickel plating thickness was 5 μm and the gold plating thickness was 0.1 μm, and the appearance of the solder resist was determined. Observed and evaluated according to the following criteria. That is, the solder resist that was not whitened was rated as “◯” and the solder resist that was recognized as “×”. The results are shown in Table 2.

[Evaluation of crack resistance]
The laminated substrate for evaluation on which the above-described solder resist was formed was exposed to the atmosphere of −55 ° C. for 15 minutes, then heated at a rate of temperature increase of 180 ° C./min, and then in the atmosphere of 125 ° C. for 15 minutes. After the exposure, the thermal cycle of lowering the temperature at a rate of 180 ° C./min was repeated 1000 times. After exposure to such an environment, cracks and peeling of the permanent resist film on the evaluation substrate were observed with a 100-fold metal microscope and evaluated according to the following criteria. In other words, “◯” indicates that the permanent resist film could not be observed for cracking and peeling, and “X” indicates that any of them could be confirmed. The results are shown in Table 2.

[Evaluation of HAST resistance]
Comb type with a line / space of 50/50 μm by etching the copper surface of a printed wiring board substrate (E-679, manufactured by Hitachi Chemical Co., Ltd., trade name) in which a 12 μm thick copper foil is laminated on a glass epoxy substrate. An electrode was formed. This substrate was used as an evaluation substrate, and a cured resist was formed on the substrate as described above, and then tested under conditions of 130 ° C., 85% RH and 5 V for 100 hours. Thereafter, the degree of occurrence of migration was observed with a 100-fold metal microscope and evaluated according to the following criteria. In other words, “◯” indicates that no significant migration occurred in the permanent resist film, and “X” indicates that significant migration occurred. The results are shown in Table 2.

[Storage stability]
The produced photosensitive film was allowed to stand at room temperature (25 ° C.) for 10 days, and then the pattern formed through the exposure, development, UV irradiation, and heating steps was observed with a stereomicroscope and judged according to the following criteria. The results are shown in Table 2.
○ Unexposed areas with no resin residue x Unexposed areas with resin residue

  ADVANTAGE OF THE INVENTION According to this invention, the photosensitive resin composition which was excellent in storage stability and excellent in HAST tolerance, and the photosensitive solder resist which can carry out alkali development of the dry film type can be provided.

Claims (12)

(A) a photosensitive prepolymer having a carboxyl group with a total content of chlorine and hydrolyzable chlorine of 100 ppm or less, and a photopolymerizable unsaturated group, (B) at least one ethylenic unsaturated group in the molecule A photopolymerizable monomer having a group, (C) a photopolymerization initiator, (D) a high-purity epoxy resin having a chlorine content of 200 ppm or less and a hydrolyzable chlorine content of 500 ppm or less, (E) curing A photosensitive resin composition containing an accelerator. (A) A monocarboxylic acid having a chlorine content of 200 ppm or less and a hydrolyzable chlorine content of 500 ppm or less and an epoxy compound having two epoxy groups in the molecule and an ethylenically unsaturated group in the molecule Obtained by reacting an epoxy carboxylate compound obtained by reacting with a compound, (b) a diisocyanate compound, (c) a diol compound having a carboxyl group, and (d) an epoxy compound having an ethylenically unsaturated group in the molecule. The photosensitive resin composition of Claim 1 which contains the polyurethane compound whose sum total of content of chlorine and hydrolysable chlorine is 100 ppm or less as a photosensitive prepolymer (A). It has an ethylenically unsaturated group in the side chain, the ethylenically unsaturated group concentration is 1.0 × 10 ^{−5 to} 6.0 × 10 ⁻³ mol / g, and chlorine and hydrolyzable chlorine The photosensitive resin composition of Claim 1 which contains the radically polymerizable copolymer whose sum total is 100 ppm or less as a photosensitive prepolymer (A). The photosensitive resin composition of Claim 1 which contains the radically polymerizable copolymer of Claim 3 which has a repeating unit derived from maleimide or a maleimide derivative in a molecule | numerator as a photosensitive prepolymer (A). (D) A high-purity epoxy resin having a chlorine content of 200 ppm or less and a hydrolyzable chlorine content of 500 ppm or less is solid at room temperature (25 ° C.) and has a softening point of 30 ° C. to 100 ° C. The photosensitive resin composition in any one of Claim 1 thru | or 4. (E) at least the thermosetting accelerator is selected from amine compounds, imidazole derivatives, quaternary ammonium salt compounds, phosphorus compounds, guanamine compounds, s-triazine derivatives, aromatic acid anhydrides, aliphatic acid anhydrides, polyphenols The photosensitive resin composition according to claim 1, which is a single type. (E) The curing accelerator is at least one selected from dicyandiamide, imidazole, 2-methylimidazole, 2-ethylimidazole, 2-vinyl-4,6-diamino-s-triazine / isocyanuric acid adduct. The photosensitive resin composition in any one of Claims 1 thru | or 6. The photosensitive resin composition according to any one of claims 1 to 7, further comprising (F) a polyfunctional maleimide compound having at least two maleimides in the molecule as a crosslinking agent. A photosensitive resin composition further comprising (A) an elastomer which is not completely compatible with (A) the photosensitive prepolymer, in the photosensitive resin composition according to any one of claims 1 to 8. The photosensitive resin composition according to any one of claims 1 to 9, further comprising (H) an inorganic filler. The photosensitive permanent resist which consists of the photosensitive resin composition in any one of Claim 1 thru | or 10. The photosensitive film which consists of a photosensitive laminated body formed by apply | coating and drying the photosensitive resin composition in any one of Claim 1 thru | or 10 on a support body.