JPS60173543A - Photosensitive resin composition - Google Patents

Abstract

PURPOSE:To obtain a compsn. capable of developing with water and is useful for the photosensitive layer of the letterpress printing, intaglio printing, and lithographic press by composing the compsn. of completely or partially saponified polyvinyl acetate and photopolymerizable monomer having ethylenic unsatd. bond in the molecule, etc. CONSTITUTION:The photosensitive resin compsn. of this invention is constituted of component A, B, C described hereunder. The component A: 100pts.wt. completely of partially saponified polyvinyl acetate having 50-100mol% degree of saponification. The component B: 20-200pts.wt. photopolymerizable monomer having ethylenic unsatd. bond in the molecule. The component C: 1-50pts.wt. polymer obtd. by homopolymerizing a polymerizable unsatd. monomer having residues expressed by the structural formulas ( I ) and (II) in the molecule or by compolymerizing the monomer with other unsatd. monomer. The average degree of polymn. of most preferred completely or partially saponified polyvinyl acetate for the component A is 500-3,000. >=2 kinds of compd. having different degree of saponification or degree of polymn. for the component A may be used in combination.

Description

[Detailed Description of the Invention] [Technical Field] The present invention provides a completely saponified or partially saponified polyvinyl acetate-based photosensitive resin plate material having high image reproducibility, printability, and good water developability. This invention relates to the photosensitive resin composition used.

[Prior art]

BACKGROUND ART Photosensitive resin plate materials for letterpress, lithography, and letterpress printing, which have a structure in which a photopolymerizable photosensitive resin layer is provided on a metal or plastic base material, have recently been put into practical use. These plate materials are made by attaching a negative or positive original film with a transparent part to a photosensitive resin layer, and then irradiating the photosensitive resin layer with actinic rays to photopolymerize the photosensitive resin layer corresponding to the transparent part of the original film. A relief is formed on the substrate by raising the polymer and then dissolving the unpolymerized portion into a suitable solvent. Photosensitive resin compositions that utilize photopolymerization reactions are used in various applications including printing plates. Among photosensitive resin compositions, a system using completely saponified or partially saponified polyvinyl acetate as a base resin has been proposed as one that can be developed by eluting unpolymerized portions with neutral water. This known example can be roughly divided into two types. The first system imparts photosensitivity to fully saponified or partially saponified polyvinyl acetate by blending a photopolymerizable monomer with an ethylenically unsaturated bond. Known examples of this type are the Japanese Patent Publication No. 46-39401 and the Japanese Patent Publication No. 50-3041. Special Publication No. 52-27561° No. 50-27602. Examples include JP-A-57-124730 and JP-A-57-212217.

The second system imparts photopolymerizability by reacting a compound having an unsaturated group with the hydroxyl group of completely saponified or partially saponified polyvinyl acetate. A known example of this type is Japanese Patent Publication No. 48-6922. Tokuko Showa 4
9-5293. JP-A-48-6S151. Japanese Patent Application Publication 1973-
40602. Japanese Patent Publication No. 50-45087. Japanese Patent Publication No. 54-1
3890° JP-A No. 58-21736. Among these known examples, when introducing unsaturated groups into fully saponified or partially saponified polyvinyl acetate itself in the second system, a large amount of hydroxyl groups that impart water solubility are removed by the unsaturated group introduction reaction. There is a problem in that the water developability is significantly reduced due to the amount of water consumed. On the other hand, in the first system, it is possible to obtain a photosensitive resin plate material with good water developability. however,
In order to obtain good water developability even in the first type of photopolymerizable monomer combination system, the fully saponified or partially saponified polyvinyl acetate used should be a low molecular weight polymer with an average degree of polymerization of 500 or less. must be used. This occurs when a polymer with a high degree of double polymerization is used.

This is because the water solubility of the polymer itself decreases and the development time becomes longer. However, since a base polymer with such a low degree of polymerization is used, the resulting relief is brittle and often causes problems such as cracks during printing.

The present inventors have conducted extensive studies on photosensitive resin plate materials with excellent photosensitivity and water developability that improve the shortcomings of systems 1 and 2, and have arrived at the present invention.

[Purpose of the invention]

The present invention relates to a photosensitive resin composition having a fully saponified or partially saponified polyvinyl acetate as a base resin, which has high image reproducibility, printability, and good water developability. Another object of the present invention is to provide a photosensitive resin composition useful for water-developable photosensitive layers for letterpress, intaglio, and planographic printing.

[Structure of the invention]

The structure of the present invention requires a photosensitive resin composition characterized by consisting of secondary A, B and C components.

A, 100 parts by weight of completely saponified or partially saponified polyvinyl acetate with a degree of saponification of 50 to 100 mol6 B9 20 to 200 parts by weight of a photopolymerizable monomer having an ethylenically unsaturated bond in the molecule C0 The following structural formula ( Polymer obtained by homopolymerizing or copolymerizing a polymerizable unsaturated monomer having 1) and (2) in the molecule with other unsaturated monomers 1 to 50 parts by weight 5-\4 where R,: H or 0H3 R2R, R4: H or C1-C4° alkyl group X
-Two pair anions [Description of preferred embodiments of the invention] The completely saponified or partially saponified polyvinyl acetate used as component A of the present invention has a degree of saponification of 50 to 100.
molar amounts are used. If the degree of saponification is less than 50 mol, the water solubility will be markedly reduced, resulting in C having good water solubility.
Since it is difficult to obtain effective water developability even with the use of these ingredients, the lower limit of the degree of saponification is 50 molar. vice versa,
It is known that completely saponified polyvinyl acetate with a degree of saponification of 100 parts by weight has poor solubility in water at room temperature, but C
Since it is possible to impart practical water developability by using the components in combination, the upper limit of the degree of saponification is 100 molar.

For the above reasons, it is necessary that the degree of saponification is in the range of 50 to 100 molar ratios, and from the viewpoint of water development speed, 70 to 95 molar ratios is more preferable.

Also, any molecular weight can be used, but
From the viewpoint of water solubility, those with a low molecular weight are good, and from the standpoint of image reproducibility and relief toughness, those with a high molecular weight are preferred. In this way, water developability, image reproducibility, and printability are contradictory selection conditions when it comes to the molecular weight of fully saponified or partially saponified polyvinyl acetate. Although it is often used, in the present invention, the water developability is improved by the combined use of component C, so even those with an average degree of polymerization of 500 or more can obtain good water developability.

However, if the average degree of polymerization exceeds 6,000, the water developability will be significantly reduced even if component C is used in combination. For these reasons, the average degree of polymerization of the fully saponified or partially saponified polyvinyl acetate, which is component A, is preferably in the range of 500 to 6,000. As component A, it is also possible to use two or more types of components having different saponification degrees or polymerization degrees in combination.

Fully saponified or partially saponified polyvinyl acetate, which is obtained by reacting an unsaturated epoxy compound such as glycidyl methacrylate with an unsaturated epoxy compound such as glycidyl methacrylate to the terminal carboxyl group of completely saponified or partially saponified polyvinyl acetate as component A to introduce a double bond at the terminal. Fully saponified or partially saponified polyvinyl acetate prepared by copolymerizing a small amount of other monomers such as allyl sulfonic acid in a 1 to 10 molar range, and partially saponified polyvinyl acetate modified by reacting ethylene oxide with the hydroxyl group. etc. can be used as long as the degree of saponification calculated from the remaining hydroxyl groups satisfies the range of 50 to 100 molar. Particularly, completely saponified or partially saponified polyvinyl acetate, which has a double bond introduced by reacting glycidyl methacrylate at the end, has a crosslinked structure formed by photopolymerization of the photopolymerizable monomer of component B. Polyvinyl acetate itself is incorporated through chemical bonds. Therefore, it is particularly preferably used because a very high degree of image reproducibility can be obtained.

In addition, as component A, a cellulose derivative such as methylcellulose having an average degree of polymerization of 500 to 3000, and an average molecular weight of 10
It is also possible to use other polymers, such as polyethylene oxide with a polyvinyl acetate of 0.00 to 50.000, mixed with the fully saponified or partially saponified polyvinyl acetate in small amounts ranging from 1 to 20% by weight or less.

As the photopolymerizable monomer used as component B in the present invention, any monomer that is compatible with component A to a certain degree or more can be used. Specifically, the following can be mentioned. 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate), 2-hydroxypropyl acrylate, 2-hydroxypropyl methacrylate, 6
-Chloro-2-hydroxypropyl acrylate), 3-
Monoacrylates and monomethacrylates having hydroxyl groups such as chloro-2-hydroxypropyl methacrylate; polyacrylates and polymethacrylates obtained by the reaction of polyhydric alcohols such as ethylene glycol with unsaturated carboxylic acids such as acrylic acid or methacrylic acid; Polyvalent acrylates and polyvalent methacrylates with hydroxyl groups synthesized by the reaction of polyvalent 9-glycidyl ethers such as ethylene glycol diglycidyl ether with unsaturated carboxylic acids such as acrylic acid and methacrylic acid, and unsaturated compounds such as glycidyl methacrylate. Polyhydric acrylates having hydroxyl groups, which are synthesized by the reaction of epoxy compounds and unsaturated carboxylic acids such as acrylic acid or methacrylic acid, and polyhydric methacrylates, acrylamide, methacrylamide, N-methylolacrylamide, and N-methylolmethacrylamide.

Dia7ton acrylamide, methylene bisacrylamide, N-methylol acrylamide, and acrylamide-based photopolymerizable monomers such as polyacrylamide and polymethacrylamide obtained by the condensation reaction of N-methylolmethacrylamide and polyhydric alcohol. , preferably acrylic or methacrylic acid esters and acrylic or methacrylamides having an OH group.

If the amount of component B used is less than 20 parts by weight based on 100 parts by weight of completely saponified or partially saponified polyvinyl acetate of component A, the density of the crosslinked structure produced by photopolymerization will be insufficient. Sufficient image reproducibility cannot be obtained. On the other hand, if the amount of component B used exceeds 200 parts by weight, the density of the crosslinked structure produced by photopolymerization becomes excessive, and the plate-made relief becomes extremely brittle. This causes problems such as cranking of the relief during printing. For the above reasons, the amount of photopolymerizable monomer used as component B needs to be in the range of 20 to 200 parts by weight per 100 parts by weight of completely saponified or partially saponified polyvinyl acetate as component A. Preferably it is 50 to 150 parts by weight.

C components (1) and (2) are represented by the following general formula.

full R.

0H2=C- +21 R2 / -N-R-X- \ 4 Here, R1 represents hydrogen and a methyl substituent.

R2, R,, R4 are hydrogen or 1 to 10 carbon atoms such as methyl, ethyl, propyl, butyl, heptyl, hexyl, etc.
represents an alkyl group, preferably hydrogen or having 1 to 1 carbon atoms.
4 lower alkyl groups are used.

Furthermore, a lower alkyl group containing a substituent such as a methylol group or a hydroxyethyl group can also be used. R2
, R, , R4 can be the same or different. X- is a counter anion that forms an ammonium salt, and X is chlorine or bromine.

Halogen atoms such as iodine or H8O4, C! H,C
OO.

OH, 080, 0H3C6H4B03, etc. are used.

Specific examples of the polymerizable unsaturated monomer of component C include the following. Dialkylaminoalkyl acrylate and dialkylaminoalkyl methacrylate compounds such as N,N-dimethylamineethyl acrylate, N,N-dimethylaminoethyl methacrylate, N,N-dimethylaminoethyl acrylate, N,N-diethylamineethyl methacrylate, dimethylamino Compounds such as dialkylaminoalkyl vinyl ethers such as ethyl vinyl ether, dimethylaminopropyl vinyl ether, dialkylaminoalkylacrylamides or dialkylaminoalkyl methacrylamide such as N (27-methylaminoethyl)acrylamide, N-(2-dimethylaminoethyl)methacrylamide , hydrochloric acid, sulfuric acid, acetic acid, methyl halide,
Examples include ammonium salt-type nitrogen atom-containing compounds obtained by quaternization with benzyl halide, dialkyl sulfuric acid, para-toluenesulfonic acid alkyl ester, and the like.

A polymer obtained by homopolymerizing the above-mentioned ammonium salt type unsaturated monomer having a nitrogen atom by a known method can be used as component C.

However, the compatibility of component A with respect to complete saponification or partial saponification can be improved by copolymerizing it with other unsaturated monomers in a known manner. Examples of such copolymerizable monomers include the following. 2-Hydroxyethyl acrylate.

Acrylates or methacrylates having hydroxyl groups, such as 2-hydroxyethyl acrylate, 2-hydro-13-xypropyl acrylate, and 2-hydroxypropyl methacrylate, and acrylamide.

methacrylamide, N-methylolacrylamide, N
- Acrylamides or methacrylamides such as methylolmethacrylamide, dimethylacrylamide, dimethylmethacrylamide.

These include unsaturated carboxylic acids such as acrylic acid and methacrylic acid.

Component C shows good water solubility due to the effect of ammonium salt type nitrogen atoms, and also has good compatibility with completely saponified or partially saponified polyvinyl acetate of component A, and by adding component C, water development is improved. performance is greatly improved. Therefore, it has become possible to use fully saponified or partially saponified polyvinyl acetate with a high degree of polymerization, which was difficult to use due to its lack of water solubility. When fully saponified or partially saponified polyvinyl acetate with a high degree of polymerization is used, extremely good image reproducibility and printing durability can be obtained as described above. Of course, when added to completely saponified 14- or partially saponified polyvinyl acetate with a low degree of polymerization,
Furthermore, the effect of improving water development is expected. Also, C
It is also observed that the ammonium base component acts as a sensitizing agent and improves sensitivity and image reproducibility.

The amount of component C used must be in the range of 1 to 50 parts by weight based on 100 parts by weight of completely saponified or partially saponified polyvinyl acetate of component A.

If the amount of component C used is less than 1 part by weight, the addition of component C will not be effective in improving water developability or as a sensitizing aid. Furthermore, if the amount used exceeds 50 parts by weight, there is a marked tendency for the water resistance of the photopolymerized portion to decrease and image reproducibility to decrease. For these reasons, the amount of component C used must be in the range of 1 to 50 parts by weight, preferably 2 to 50 parts by weight, based on 100 parts by weight of completely saponified or partially saponified polyvinyl acetate as component A. ~20 parts by weight.

In the photosensitive resin composition of the present invention, ethylene glycol, diethylene glycol, triethylene glycol, chrycerin, triethylene glycol, diethylene glycol, triethylene glycol, triethylene glycol, etc. Methylolpropane.

It is also possible to add polyhydric alcohols such as trimethylolethane. These polyhydric alcohols are recognized to have the effect of increasing the flexibility of the photopolymerized portion and preventing the occurrence of relief cracks.

Such polyhydric alcohol can be used in an amount of 40% by weight or less based on the photosensitive resin composition.

As the photosensitizer that promptly carries out the photopolymerization reaction of the present invention, all conventionally known compounds can be used. Examples include benzoin alkyl ethers, hensifenones, anthraquinones, benzyls, acetophenones, and diacetyls. These photosensitizers.

It can be used in an amount of 0.01 to 101 to 10 parts by weight based on the total composition.

All conventionally known polymerization inhibitors can be used to increase the thermal stability of the photosensitive composition of the present invention. Preferred thermal polymerization inhibitors include phenols, hydroquinones, catechols, and the like. These heat stabilizers can be used in an amount of 0.6001 to 5.0% by weight based on the total amount of the composition. In addition, dyes, pigments, surfactants,
Antifoaming agent.

It is also possible to add ultraviolet absorbers and the like.

The method for producing the composition of the present invention includes heating and dissolving component A, completely saponified or partially saponified polyvinyl acetate, in a water/alcohol mixed solvent.

Adding a photopolymerizable monomer as component B, a polymer having an ammonium base as component C, a photosensitizer, a heat stabilizer, etc.
It is common to mix thoroughly by stirring.

In this way, a photosensitive resin solution is obtained.

To form a photosensitive layer from the above-mentioned mixed solution, for example, most of the solvent can be distilled off, and then heated to melt the solution and extrude it onto a support to form it. It is also possible to form a photosensitive layer by making a photosensitive sheet by a dry film forming method and adhering this sheet onto a support. moreover,
A photosensitive layer can also be obtained by dry film forming directly on the support. As the support, a metal plate such as steel, stainless steel, aluminum 17-um, or copper, a plastic sheet such as polyester film, or a synthetic rubber sheet such as styrene-butadiene copolymer is used.

The photosensitive layer is preferably formed to have a thickness of 01 to 10 mm.

In order to form a relief image for printing using the photosensitive resin composition of the present invention, a negative or positive original film is closely adhered to the photosensitive layer prepared as described above, and a wavelength of usually 300 to 400 mp is applied. Ultraviolet rays from high-pressure mercury lamps, ultra-high-pressure mercury lamps, metal halide lamps, xenon lamps, carbon arc lamps, and chemical lamps are irradiated to cause insolubilization through photopolymerization. Next, a relief is formed on the support by dissolving the unpolymerized portion into water using a spray developing device or a brush developing device using neutral water.

The photosensitive composition of the present invention has good water developability and provides a printing plate material with high image reproducibility and durability during printing. By adding an ammonium salt-type nitrogen atom-containing polymer as component C, the water developability was improved. This is because it has become possible to use fully saponified or partially saponified polyvinyl acetate with a high degree of saponification. When fully saponified or partially saponified polyvinyl acetate having a high degree of polymerization is used as the base polymer, the relief obtained by photopolymerization of component B has good water resistance and therefore a high degree of image reproducibility can be obtained. Furthermore, since the relief is strong, troubles such as cracks during printing can be prevented.

The photosensitive resin composition of the present invention is most effective when used as a letterpress printing material, but it can also be used as a lithographic printing material, an intaglio printing material, a stencil printing material, and a photoresist.

The present invention will be explained in more detail with reference to Examples below.

Example 1 100 parts by weight of partially saponified polyvinyl acetate with a degree of saponification of 80 molar and an average degree of polymerization of 600 was mixed with ethanol/water-5015.
It was heated to 80° C. and dissolved in 170 parts by weight of a mixed solvent of 0 (weight ratio). Next, 70 parts by weight of an addition reaction product of 1 mole of propylene glycol diglycidyl ether and 2 moles of acrylic acid was added as a photopolymerizable monomer and thoroughly mixed with stirring.

Furthermore, methacrylate/2-
10 parts by weight of a copolymer of -2/1 (weight ratio) of hydroxyethyl methacrylate was added and thoroughly stirred and mixed.

CH3 followed by 17 parts by weight of ethylene glycol and 3 parts by weight of dimethylbenzyl ketal as a photosensitizer.

1 part by weight of hydroquinone monomethyl ether, a heat stabilizer, was added and mixed thoroughly with stirring.

The photosensitive resin solution thus obtained was coated with a polyester adhesive in advance and placed on a polyester film with a thickness of 200μ so that the total thickness after drying was 950μ.
It was cast in a hot air oven at 60° C. for 5 hours to completely remove the solvent. After applying a thin layer of ethanol/water-50,750 (weight ratio) solvent to the surface of the photosensitive layer obtained in this way, a 100μ thick polyester film whose surface has been matted by chemical etching is pressed to form a cover film. I installed it.

After storing this plate material in a dark place for 10 days, the cover film was peeled off, and a gray scale negative film for sensitivity measurement and a negative film for image reproducibility evaluation (163 line 3%, 5
%, 10% halftone dots, independent points with diameters of 200μ and 600μ, and thin line portions with widths of 50μ and 70μ) were vacuum-adhered and exposed for 2 minutes with an ultra-high pressure mercury lamp.

Next, using a spray type developing device filled with neutral water at 30°C, development was carried out under conditions of a water pressure of 31 g/an2, and the non-image area was completely eluted into the water within 4 minutes, creating a relief. I can't get the statue. The gray scale remained up to 16 steps, indicating high sensitivity. The image is 3% halftone,
It was confirmed that even minute parts such as 200μ independent points and 50μ thin lines were reproduced sharply.

21- When a printing test was conducted using the plate material obtained in this way, a sharp printed product with no thick lines was obtained. Further, although printing was carried out up to 300,000 copies, no problems such as occurrence of cracks were observed.

Comparative Example 1 In the example, dimethylamine ethyl methacrylate hydrochloride/2-hydroxyethyl methacrylate) = 2/
A photosensitive resin plate material was produced in exactly the same manner except that 10 parts by weight of copolymer No. 1 was not added.

The obtained plate material was exposed and developed under the same conditions as in Example 1. Development required 6 minutes, which was about 1.5 times longer than in Example 1. The gray scale remained only up to 15 steps, and the sensitivity was lower than in Example 1. It was found that only 10% of the halftone dots were reproduced, and the 200μ independent points and 50μ thin lines lacked sharpness, which made it clear that this was considerably inferior to Example 1.

Example 2 22- Degree of saponification 75 molt, average degree of polymerization 1. 100 parts by weight of partially saponified polyvinyl acetate of Q00 was mixed with ethanol/water.
80°C to 200 parts by weight of a mixed solvent of 50150 (weight ratio)
It was heated and dissolved. Next, 50 parts by weight of glycerol diacrylate as a photopolymerizable unsaturated monomer was added and mixed thoroughly with stirring.

Next, 6 parts by weight of a methacrylate homopolymer having an ammonium salt type nitrogen atom represented by the following structural formula was added and thoroughly stirred and mixed.

Oh.

Further, 10 parts by weight of glycerin and 5 parts by weight of benzophenone as a photosensitizer were added and thoroughly mixed.

The photosensitive resin solution thus obtained was cast onto a 250 μm thick steel substrate on which an epoxy adhesive had been applied and cured in advance so that the total thickness after drying would be 730 μm. Next.

The solvent was completely removed by placing the plate in an oven at 60° C. for 4 hours to obtain a photosensitive resin plate.

After storing this plate material in a dark place for one week, the same negative film as in Example 1 was vacuum-adhered to the photosensitive layer and exposed to ultraviolet light from a chemical lamp for 5 minutes. Then, when it was washed for 1 minute using a brush type developing device containing neutral water at a water temperature of 25° C., the unpolymerized portion was completely eluted into the water, and a relief image was formed on the substrate.

When the obtained relief was examined, it was found that the gray scale part remained up to 16 steps, indicating high sensitivity. Even though it was a long time ago, we confirmed that even minute details such as 6% halftone dots, 200μ independent dots, and 50μ thin lines were reproduced sharply.

Comparative Example 2 A photosensitive resin plate material was prepared in exactly the same manner as in Example 2, except that 5 parts by weight of the ammonium salt type nitrogen atom-containing polymer was not added.

The obtained plate material was exposed and developed under the same conditions as in Example 2.

Development required 1.5 minutes, which was 1.5 times longer than in Example 20. Only up to 15 steps remained in the gray scale part, and the sensitivity was lower than in Example 2. In addition, only up to 5 dots are reproduced, and 200μ independent points and 5 dots are reproduced.
The 0μ fine line also lacked sharpness.

Example 6 Partially saponified polyvinyl acetate having a degree of saponification of 90 mol and an average degree of polymerization of 1500 was heated and dissolved at 80° C. in 250 parts by weight of a mixed solvent of ethanol/water = 20/80 (weight ratio).

Next, 25 parts by weight of an acrylamide/methacrylamide 2/1 (weight ratio) copolymer having an ammonium salt type nitrogen atom having the following structural formula was added and thoroughly mixed with stirring.

\OH5 Next, 120 parts by weight of 2-hydroxyethyl methacrylate and 10 parts by weight of ethylene glycol dimethacrylate were added as photopolymerizable monomers.

Two parts by weight of bayonet methyl ether as a photosensitizer and 001 to 25 parts by weight of hydroquinone as a heat stabilizer were added and thoroughly stirred and mixed.

The photosensitive resin solution thus obtained was cast onto a 300 μm thick aluminum substrate that had been coated and cured with a polyester/inocyanate adhesive so that the total thickness after drying would be 580 μm. did. Then 6
The solvent was removed by placing in an oven at 0° C. for 2 hours.

The obtained plate material was exposed and developed under the same conditions as in Example 1. 2
A relief image was obtained on the substrate by developing for a minute. The gray scale part remains up to 16 steps,
It had high sensitivity. Also, 3 halftone dots, 200μ independent points, 5
Even minute details such as 0μ fine lines were reproduced sharply.

Comparative Example 6 A photosensitive resin plate material was produced in the same manner as in Example B except that 25 parts by weight of the ammonium salt type nitrogen atom-containing polymer was not added.

When the obtained plate material was exposed and developed under the same conditions as in Example 6, 5 minutes were required for development. This was 25 times longer than the 2 minutes in Example B.

2A - The grayscale portion was also left only after 16 steps, and the 3% and 5% halftone dots and 200μ independent points were not reproduced. In addition, significant bending occurred in the 50μ thin wire. As described above, it was clear that the developability and photosensitive properties were significantly inferior to Example B.

Patent applicant Higashi Shikikai Co., Ltd. 27-

Claims (1)

[Scope of Claims] A. 100 parts by weight of completely saponified or partially saponified polyvinyl acetate with a degree of saponification of 50 to 100 molar R6 20 to 200 parts by weight of a photopolymerizable monomer having an ethylenically unsaturated bond in the molecule C9 Polymer obtained by homopolymerizing or copolymerizing a polymerizable unsaturated monomer having the following structural formulas (1) and (2) in the molecule with other unsaturated monomers: 1 to 50 parts by weight\4 However, R,: H is still OH. R2, R, R4: H is still c, ~c,. A photosensitive resin composition characterized by comprising an alkyl group X-: counter anion.