JP3124477B2 - Resin composition for screen plate making - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water-developable resin composition suitable for preparing a printing plate, particularly a screen printing plate, having excellent solvent resistance, water resistance and printability.

[0002]

2. Description of the Related Art In screen printing, a screen is attached to an aluminum frame or a wooden frame, a film of a water-soluble photosensitive resin composition is formed on the screen, photocrosslinked by ultraviolet irradiation, and then water or alkali developed. Printing is performed by using a printing plate on which an image has been formed and extruding ink from a screen portion having no plate film. This screen printing is
It has features such as simplicity of plate making and printing, high image accuracy, large thickness of printed ink, and difficulty in selecting a printing medium.It is used in various fields, and it is used for printing flags and posters. Applications such as printing of solder resists and etching resists from printing to production of printed circuit boards are expanding. At present, the resin composition used for screen printing includes a composite liquid of an aqueous solution obtained by adding a diazo resin as a photocrosslinking agent to a partially saponified polyvinyl alcohol which is a water-soluble polymer and a vinyl acetate polymer emulsion, or A mixture of a photocrosslinkable aqueous solution of a water-soluble polymer obtained by adding a stilpyridinium group to a saponified polyvinyl alcohol and a vinyl acetate composite emulsion is frequently used.

[0003] However, as the use of screen printing in the production of printed circuit boards increases, the demand for performance of the screen printing plate increases, and excellent water resistance, solvent resistance, high precision and excellent printability are required. Screen printing plates having the following, the conventional resin composition described above, because the water resistance and solvent resistance of the plate film after photocrosslinking is inferior, the problem of resolution, the problem of poor plate contact during printing, etc. High-precision printing is difficult, and it is becoming impossible to respond to users' detailed needs. As described in JP-B-4-19542 and JP-B-4-19543, water-insoluble or sparingly-soluble resins having an ethylenically unsaturated group are known as disclosed in JP-B-4-19542 and JP-B-4-19543. A photosensitive resin composition in which a polymerizable unsaturated compound is emulsified and mixed with a photoinitiator has been proposed. However, although this resin composition has excellent performance such as water resistance and solvent resistance, the polymerizable unsaturated compound having an ethylenically unsaturated group used here has a strong irritating property to the skin. During the development work, the polymerizable unsaturated compound is mixed into the developer without being reacted and is discharged, which is not preferable from the viewpoint of environmental protection, and is only partially implemented. .

[0004]

SUMMARY OF THE INVENTION The present invention has been developed in view of the circumstances described above, and is suitable for making a screen printing plate having excellent water resistance and solvent resistance and capable of high-precision printing. Another object of the present invention is to provide a water-developable resin composition which is environmentally friendly.

[0005]

Means for Solving the Problems The present inventors have conducted intensive studies and as a result, as a resin composition for screen plate making,
(C) a compound having three or more unsaturated double bonds in the molecule
A polymer obtained by emulsion polymerization of a polymerizable compound containing 20% by weight or more is (A) polyvinylidene having a degree of polymerization of 300 to 3000.
Alcohol-based resin (however, if the polymerization degree is 1500 or less
Excluding) a mixed solution of an aqueous solution obtained by adding a diazonium resin to a conventional partially saponified polyvinyl alcohol and a vinyl acetate polymer emulsion, or a light obtained by adding a stilpyridinium group to a partially saponified polyvinyl alcohol. Compared to using a mixture of a cross-linkable aqueous solution of a water-soluble polymer and a vinyl acetate polymer emulsion, the water resistance and solvent resistance are significantly improved,
It has been found that a resin composition capable of making a screen printing plate having high precision and excellent printability can be obtained,
The present invention has been completed. That is, the present invention provides (A) a
₁ ) Polyvinyl alcohol having a degree of polymerization of 300 to 3000
Resin (however, excluding those with a polymerization degree of 1500 or less)
a ₂ ) A polymer obtained by emulsion polymerization of a polymerizable compound containing 20% by weight or more of a diazonium-based photocrosslinking agent and (C) a compound having three or more unsaturated double bonds in a molecule as an essential component. The present invention relates to a resin composition contained therein.

As a method for producing the above resin composition, a compound having three or more unsaturated double bonds in a molecule is used.
A polymerizable compound containing 20% by weight or more is preliminarily emulsified in the presence of an emulsifier or a small amount of polyvinyl alcohol to obtain a polymer aqueous dispersion, and the degree of polymerization containing a diazonium-based photocrosslinking agent is 300 to 3000. Polyvinyl alcohol-based
Resin (however, except for those having a degree of polymerization of 1500 or less) can also be obtained by mixing with an aqueous solution, but the present inventor (C) has three or more unsaturated double bonds in the molecule. A polymerizable compound containing at least 20% by weight of a compound having the following formula (A): a polymer containing (A) a diazonium-based photocrosslinking agent having a degree of polymerization of 300 to 3,000.
Revinyl alcohol-based resin (However, polymerization degree is 1500 or less
It has been found that when emulsion polymerization is carried out in an aqueous solution of the following ( excluding the following), the composition is stabilized, and a photosensitive resin composition more excellent in water resistance and solvent resistance can be obtained. In this case, it is desirable to add and mix the diazonium-based photocrosslinking agent after the emulsion polymerization.

The polyvinyl alcohol resin (A) of the photosensitive resin composition of the present invention has a saponification degree of 70 to 99 mol%,
Degree of polymerization 300-3000, preferably 80-95 mol% of saponification degree,
Partially saponified polyvinyl alcohol with a polymerization degree of 500 to 2000,
A vinyl acetate component of a copolymer of vinyl acetate and allyl acetate, maleic acid, phthalic acid, acrylic acid, methacrylic acid, itaconic acid, etc., in advance, or partially or completely saponified saponified product after copolymerization, maleic anhydride to polyvinyl alcohol Acid, phthalic anhydride, partially esterified polyvinyl alcohol to which a small amount of acid anhydride such as succinic anhydride is added, and partially acetalized polyvinyl alcohol to which a small amount of aldehyde such as crotonaldehyde, butyraldehyde, and furfural acrolein are bonded, and stilbazolium group. And the like .

The compound having three or more unsaturated double bonds in the molecule used in the photosensitive resin composition of the present invention includes trimethylolpropane tri (meth) acrylate, trimethylolethane tri (meth) acrylate, Methylolpropane propylene oxide-modified tri (meth) acrylate, hydroxypivalylaldehyde-modified dimethylolpropane tri (meth) acrylate, pentaerythritol tri (meth) acrylate,
Pentaerythritol tetra (meth) acrylate, dipentaerythritol penta (meth) acrylate, dipentaerythritol hexa (meth) acrylate, dipentaerythritol triacrylate tripropionate, dipentaerythritol tetraacrylate dipropionate, dipentaerythritol pentaatri Rate monopropionate, pentaerythritol ethylene oxide modified tri (meth) acrylate, dipentaerythritol caprolactone modified hexa (meth) acrylate, glycerin propylene oxide modified tri (meth) acrylate, tris (acryloyloxyethyl) isocyanurate, trisacryloyl Oxyethyl phosphate, 1,3,5-triacryloylhexahydro-S-triazine, etc. But it is lower, but the invention is not particularly limited to these compounds.

In the present invention, the compound containing 20% by weight or more of the compound having three or more unsaturated double bonds in the molecule may be polymerized alone in the aqueous solution of the above (A). May be copolymerized with the above polymerizable compound. Examples of the polymerizable compound that can be copolymerized include isobutyl (meth) acrylate, t-butyl (methacrylate), lauryl (meth) acrylate, dibromoneopentyl glycol di (meth) acrylate, and 2,8-dibromopropyl (meth) acrylate. , Methoxyethyl vinyl ether, hexyl diglycol (meth) acrylate, ethylene glycol di (meth) acrylate, dihexaethylene glycol di (meth) acrylate, 2-ethyl-hexyl glycidyl ether (meth) acrylate, phenyl glycidyl ether (meth) acrylate Diglycidyl ether terephthalate (meth) acrylate, the reaction product of 2-hydroxypropyl (meth) acrylate with tolylene diisocyanate, 2-hydroxypropyl (meth) acryle Reaction products of bets and phenyl isocyanurate.

In the present invention, a polymer having three or more unsaturated double bonds in a molecule is contained in an amount of 20% by weight or more, preferably 30% by weight or more, and the above polymerizable compound is emulsion-polymerized. Since the molecules are three-dimensionally crosslinked in the body particles, it is possible to obtain a photosensitive resin composition that is extremely excellent in terms of water resistance and solvent resistance. Plate making is possible. On the other hand, when the amount of the compound having three or more unsaturated double bonds in the molecule is 20% by weight or less, the cross-linking density of the molecule in the polymer aqueous dispersion particles is low, and the solvent resistance of the polymer aqueous dispersion is low. Due to poor water resistance, a photosensitive resin composition containing such a polymer aqueous dispersion is prepared by mixing a conventional polyvinyl alcohol aqueous solution with a diazonium photocrosslinking agent and a vinyl acetate polymer emulsion. High-precision printing is possible in the same way as a photosensitive resin composition obtained by mixing a water-soluble aqueous polymer solution with a stilpyridinium group added to a photosensitive resin composition or polyvinyl alcohol and a vinyl acetate polymer emulsion. Screen printing plate cannot be made.

In the photosensitive resin composition of the present invention, when a polyvinyl alcohol-based resin having no photocrosslinking property is used as the polyvinyl alcohol-based resin, it is necessary to incorporate a diazonium resin as a photocrosslinking agent. A p-diazodiamine-water-soluble diazonium resin in the form of an anion complex such as a sulfate salt of a paraformaldehyde condensate, a phosphate salt and a zinc chloride double salt is used. Examples of the diazonium resin include para-aminodiphenylamine and 4-amino- Diazo compounds of diphenylamines such as 4'-methyldiphenylamine, 4-amino-4'-methoxydiphenylamine, and 4-amino-4'-nitrodiphenylamine are condensed with aldehydes such as paraformaldehyde and acetaldehyde. . These diazo resins are used alone or in combination, and 0.1 to 10
It is advisable to mix in parts by weight, preferably 1 to 5 parts by weight.
Further, the photosensitive resin composition of the present invention includes a known polyvinyl acetate emulsion, an ethylene-vinyl acetate copolymer emulsion commonly used in a screen plate-making resin composition,
Aqueous polymer dispersions such as acrylic ester emulsions, polystyrene emulsions, and polyvinyl chloride emulsions can also be added. Further, fine powders such as silica and alumina, coloring agents such as dyes and pigments, and various additives such as surfactants may be mixed with these photosensitive resin compositions as necessary.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention and its effects will be specifically described below with reference to examples.

Example 1 Water 150 was placed in a 500 ml three-neck separable flask.
g, emulsifier (“Lionox NC-500” manufactured by Lion) 1
g, dissolving 0.3 g of potassium persulfate, a polymerization initiator, and neopentyl glycol diacrylate having two unsaturated double bonds in the molecule ("Biscoat" manufactured by Osaka Organic Chemical Industry Co., Ltd.)
# 215 ”) 150 g of an acrylic monomer mixture consisting of 50% by weight and 50% by weight of trimethylolpropane triacrylate having three unsaturated double bonds in the molecule (“ NK ester TMPT ”manufactured by Shin-Nakamura Chemical Co., Ltd.) While 70 ° C,
A polymerization reaction was carried out for 3 hours to prepare a polymer aqueous dispersion having a solid content of 50%. 140 g of this polymer aqueous dispersion is 10% by weight of partially saponified polyvinyl alcohol (“P-
18 "Saponification degree: 88 mol%, polymerization degree: 1800) 300 g of aqueous solution, 4 g of sulfate (diazo resin) of a condensate of p-diazodiphenylamine and paraformaldehyde as a photocrosslinking agent and blue pigment
0.3 g was added and mixed to prepare a resin composition for screen plate making. The resin composition thus obtained was applied by a direct method to a screen plate having a 300-mesh polyester screen so that the thickness of the photosensitive film became 10 μm.
Next, an image mask having a line width of 100 μm was applied, and exposure was performed for 60 seconds with a 3 kw metal halide lamp. Then, the film was immersed in water at 20 ° C. for 2 minutes, sprayed with water using a spray gun with an air pressure of 4 kg / cm ² , developed completely, and then dried. The printing plate created in this way faithfully reproduces an image mask with a line width of 100 μm, and this printing plate is used to print on a methacrylic plate.
When 1000 sheets were printed, there was no elution or swelling with respect to the solvent of the ink, extremely excellent resistance was obtained, and a very beautiful printed matter was obtained.

[0013]

Example 2 Water 150 was placed in a 500 ml three-neck separable flask.
g, emulsifier (“Lionox NC-500” manufactured by Lion) 1
g, dissolving 0.3 g of potassium persulfate as a polymerization initiator, and ethylene oxide-modified bisphenol A diacrylate having two unsaturated double bonds in the molecule ("BP-4EA" manufactured by Kyoeisha Yushi Co., Ltd.) 60% by weight, molecule Polymerization at 70 ° C for 3 hours while drop-wise mixing 150g of an acrylic monomer mixture consisting of 40% by weight of trimethylolpropane trimethacrylate having three unsaturated double bonds (“NK ester TMPT” manufactured by Shin-Nakamura Chemical Co., Ltd.) The reaction was carried out to prepare a polymer aqueous dispersion having a solid content of 50%. 10% by weight partially saponified polyvinyl alcohol ("P-18" manufactured by Shin-Etsu Chemical Co., Ltd., saponification degree: 88 mol%, polymerization degree: 1800) 1-methyl-4 (p-formylstyryl) pyridinium 0.13 g in 400 g of aqueous solution, acid catalyst As phosphoric acid
An acetalization reaction was performed by adding 0.2N, and after the reaction, the reaction was neutralized to a pH of 6 with a 0.5N aqueous sodium hydroxide solution to obtain a polyvinyl alcohol aqueous solution having a photocrosslinkable functional group in the molecule. This aqueous solution, 120 g of the previously prepared aqueous polymer dispersion, and 0.3 g of a blue pigment were added and mixed to prepare a resin composition for screen plate making.
The resin composition thus obtained was applied by a direct method to a screen plate having a 300-mesh polyester screen so that the thickness of the photosensitive film was 7 μm. Next, the line width
Exposure was performed for 15 seconds with a 3 kw metal halide lamp with a 100 μm image mask. Then, the film was immersed in water at 20 ° C. for 2 minutes, sprayed with water using a spray gun with an air pressure of 4 kg / cm ² , developed completely, and then dried. In the printing plate thus prepared, an image mask with a line width of 100 μm was faithfully reproduced, and when 1500 sheets were printed on a methacryl plate using this printing plate, the printing medium was exposed to the solvent of the ink. And very good print quality was obtained.

[0014]

Example 3 Water 150 was placed in a 500 ml three-neck separable flask.
g, emulsifier (“Lionox NC-500” manufactured by Lion) 1
g, dissolving 0.3 g of potassium persulfate, a polymerization initiator, and neopentyl glycol diacrylate having two unsaturated double bonds in the molecule ("Biscoat" manufactured by Osaka Organic Chemical Industry Co., Ltd.)
# 215 ”) 150 g of an acrylic monomer mixture consisting of 50% by weight and 50% by weight of trimethylolpropane triacrylate having three unsaturated double bonds in the molecule (“ NK ester TMPT ”manufactured by Shin-Nakamura Chemical Co., Ltd.) While 70 ° C,
A polymerization reaction was carried out for 3 hours to prepare a polymer aqueous dispersion having a solid content of 50%. 30 g of this polymer aqueous dispersion and 10% by weight of partially saponified polyvinyl alcohol (Shin-Etsu Chemical Co., Ltd.
18 ", a saponification degree of 88 mol%, a polymerization degree of 1800) 300 g of an aqueous solution, and 80 g of a vinyl acetate polymer emulsion (" Movinyl 50M ", Hoechst Gosei Co., Ltd., solid content 50%) were stirred and mixed. Further, 4 g of a sulfate (diazo resin) of a condensate of p-diazophenylamine and paraformaldehyde as a photo-crosslinking agent and a blue pigment were added and mixed to prepare a resin composition for screen plate making. The resin composition thus obtained was applied by a direct method to a screen plate having a 300-mesh polyester screen so that the thickness of the photosensitive film became 10 μm. Next, an image mask having a line width of 100 μm was applied, and exposure was performed for 60 seconds with a 3 kw metal halide lamp. Then 20
After immersion in water at 2 ° C. for 2 minutes, water was sprayed using an air pressure 4 kg / cm ² spray gun to completely develop and then dried. In the printing plate thus created, an image mask with a line width of 100 μm was faithfully reproduced, and when this plate was used to print 1000 sheets on a methacryl plate, the printing plate was exposed to the solvent of the ink. There was no dissolution or swelling, and extremely excellent resistance was obtained, and a very beautiful printed matter was obtained.

[0015]

Example 4 Ethylene oxide-modified bisphenol A diacrylate having two unsaturated double bonds in the molecule ("BP-4EA" manufactured by Kyoeisha Yushi Co., Ltd.) and 70% by weight of three unsaturated double bonds in the molecule Trimethylolpropane trimethacrylate (“NK Ester TMPT” manufactured by Shin-Nakamura Chemical Co., Ltd.)
70 g of an acrylic monomer mixture composed of 30% by weight and 1 g of azobisisobutyronitrile as a polymerization initiator were stirred and mixed, and the mixture was mixed with 10% by weight of partially saponified polyvinyl alcohol (“P- 18) Saponification degree 88 mol%, polymerization degree 1800) After emulsification and mixing in 300 g of aqueous solution, 70
The polymerization reaction was performed at a temperature of 3 ° C. for 3 hours. Furthermore, 3 g of a sulfate (diazo resin) of a condensate of p-diazophenylamine and paraformaldehyde as a photocrosslinking agent and a blue pigment
0.3 g was added and mixed to prepare a resin composition for screen plate making. The resin composition thus obtained was applied to a screen plate having a 300-mesh polyester screen so as to have a thickness of 8 μm by a direct method.
Next, an image mask having a line width of 70 μm was applied and exposed for 40 seconds with a 3 kw metal halide lamp. Then, the film was immersed in water at 20 ° C. for 2 minutes, sprayed with water using a spray gun with an air pressure of 4 kg / cm ² , developed completely, and then dried. In the printing plate thus prepared, an image mask with a line width of 70 μm was faithfully reproduced, and the printing plate was used to print 3000 mm on a methacryl plate.
After printing the sheet, it elutes with respect to the solvent of the ink,
There was no swelling, very good resistance was obtained, and very beautiful printed matter was obtained.

[0016]

Example 5 Ethylene oxide-modified bisphenol A diacrylate having two unsaturated double bonds in the molecule ("BP-4EA" manufactured by Kyoeisha Yushi Co., Ltd.) was used in an amount of 70% by weight and three unsaturated double bonds in the molecule. Trimethylolpropane trimethacrylate (“NK Ester TMPT” manufactured by Shin-Nakamura Chemical Co., Ltd.)
70 g of an acrylic monomer mixture composed of 30% by weight and 1 g of azobisisobutyronitrile as a polymerization initiator were stirred and mixed, and the mixture was mixed with 10% by weight of partially saponified polyvinyl alcohol (“P- 18) Saponification degree 88 mol%, polymerization degree 1800) After emulsification and mixing in 300 g of an aqueous solution, 80 g of a vinyl acetate polymer emulsion (“Movinyl 50M”, Hoechst Gosei Co., solid content 50%) was stirred and mixed at 70 ° C. 3
The polymerization reaction was performed for an hour. Further, 3 g of a sulfate (diazo resin) of a condensate of p-diazophenylamine and paraformaldehyde as a photocrosslinking agent and a blue pigment were added to the mixture and mixed to prepare a resin composition for screen plate making. The resin composition thus obtained was applied to a screen plate having a 300-mesh polyester screen so as to have a thickness of 8 μm by a direct method. Next, line width 50μ
m with a 3kw metal halide lamp
Second exposure. Then, after immersing in water of 20 ° C for 2 minutes, air pressure 4
Water was sprayed using a kg / cm ² spray gun to completely develop and then dried. In the printing plate created in this way, an image mask with a line width of 50 μm is faithfully reproduced.
Further, when 2,000 sheets were printed on a methacrylic plate using this printing plate, there was no elution or swelling with respect to the solvent of the ink, extremely excellent resistance was obtained, and a very beautiful printed matter was obtained.

[0017]

[Comparative Example 1] 10% by weight of partially saponified polyvinyl alcohol ("P-18" manufactured by Shin-Etsu Chemical Co., Ltd., saponification degree: 88 mol%, polymerization degree: 1800) 50M ", 50% solids)
140 g was added and mixed with stirring. Further, 4 g of sulfate (diazo resin) of a condensate of p-diazophenylamine and paraformaldehyde as a photo-crosslinking agent and a blue pigment
0.3 g was added and mixed to prepare a resin composition for screen plate making. The resin composition thus obtained was applied by a direct method to a screen plate having a 300-mesh polyester screen so that the thickness of the photosensitive film became 10 μm.
Next, an image mask having a line width of 100 μm was applied, and exposure was performed for 60 seconds with a 3 kw metal halide lamp. Then, the film was immersed in water at 20 ° C. for 2 minutes, sprayed with water using a spray gun with an air pressure of 4 kg / cm ² , developed completely, and then dried. The printing plate thus prepared was subjected to swelling during development, and when this plate was used to print 1,000 sheets on a methacryl plate, the plate film swelled due to the solvent of the ink, and the printing plate was swollen. Of the printing plate was deteriorated, a precise and clear printed matter was not obtained, and the plate film was peeled off from the screen.

[0018]

[Comparative Example 2] Water 150 was placed in a 500 ml three-neck separable flask.
g, emulsifier (“Lionox NC-500” manufactured by Lion) 1
g, neopentyl glycol diacrylate having two unsaturated double bonds in the molecule ("Biscoat # 215" manufactured by Osaka Organic Chemical Industry Co., Ltd.)
Polymerization was carried out for 3 hours to prepare a polymer aqueous dispersion. 140 g of this aqueous polymer dispersion and 300 g of a 10% by weight aqueous solution of a partially saponified polyvinyl alcohol (“P-18” manufactured by Shin-Etsu Chemical Co., Ltd., saponification degree: 88 mol%, polymerization degree: 1800) were stirred and mixed. further,
4 g of a sulfate (diazo resin) of a condensate of p-diazophenylamine and paraformaldehyde as a photocrosslinking agent and 0.3 g of a blue pigment were added and mixed to prepare a resin composition for screen plate making. The resin composition thus obtained was applied by a direct method to a screen plate having a 300-mesh polyester screen so that the thickness of the photosensitive film became 10 μm. Next, an image mask having a line width of 100 μm was applied, and exposure was performed for 50 seconds with a 3 kw metal halide lamp. Then 20
After immersion in water at 2 ° C. for 2 minutes, water was sprayed using an air pressure 4 kg / cm ² spray gun to completely develop and then dried. The printing plate thus prepared was subjected to swelling during development, and when this plate was used to print 1,000 sheets on a methacryl plate, the plate film swelled due to the solvent of the ink, and the printing plate was swollen. The print separation property was poor, and a precise and clear printed matter could not be obtained.

[0019]

Comparative Example 3 Ethylene oxide-modified bisphenol A diacrylate having two unsaturated double bonds in the molecule ("BP-4EA" manufactured by Kyoeisha Yushi Co., Ltd.) and 85% by weight of the molecule and three unsaturated double bonds in the molecule Trimethylolpropane trimethacrylate (“NK Ester TMPT” manufactured by Shin-Nakamura Chemical Co., Ltd.)
70 g of an acrylic monomer mixture consisting of 15% by weight and 1 g of azobisisobutyronitrile as a polymerization initiator were stirred and mixed, and the mixture was mixed with 10% by weight of partially saponified polyvinyl alcohol ("P- 18) Saponification degree 88 mol%, polymerization degree 1800) After emulsification and mixing in 300 g of aqueous solution, 70
The polymerization reaction was performed at a temperature of 3 ° C. for 3 hours. Furthermore, 3 g of a sulfate (diazo resin) of a condensate of p-diazophenylamine and paraformaldehyde as a photocrosslinking agent and a blue pigment
0.3 g was added and mixed to prepare a screen plate-forming resin composition. The resin composition thus obtained was applied to a screen plate having a 300-mesh polyester screen so as to have a thickness of 8 μm by a direct method. Next, an image mask having a line width of 70 μm was applied and exposed to a metal halide lamp of 3 kw for 45 seconds, immersed in water of 20 ° C. for 2 minutes, and completely developed by spraying with water using an air pressure 4 kg / cm ² spray gun. Dried. When printing 1000 sheets on a methacrylic board using the printing plate created in this way,
The plate solution swelled due to the ink solution and the releasability of the plate from the printing medium deteriorated, and a precise and clear printed matter could not be obtained.

[0020]

According to the present invention, the degree of polymerization (A) is 300 to 3000.
Polyvinyl alcohol resin (However, polymerization degree is 1500
The following excluding) the photocrosslinking agent 及 beauty (C) a polymer of a polymerizable compound obtained by emulsion polymerization comprising a compound 20 wt% or more in a molecule having three or more unsaturated double bonds, the Printing plates made from the photosensitive resin composition contained as an essential component, especially screen printing plates, have excellent resolution because the water resistance and solvent resistance of the plate film are excellent, and the solvent and plate of the ink There is no extraordinary change such as swelling or elution of the plate film due to the solvent used for the wiping operation, and high precision printing can be performed for a long time. Therefore, the photosensitive resin composition of the present invention, in which sharp and high-precision printing can be continuously obtained, has extremely high industrial value. In addition, a polymerizable compound containing at least 20% by weight of a compound having three or more unsaturated double bonds in the molecule is (A) a polymer having a degree of polymerization of 300 to 3000.
Revinyl alcohol-based resin (However, polymerization degree is 1500 or less
The photosensitive resin composition obtained by the step of emulsion polymerization in an aqueous solution ( excluding the following) can provide a photosensitive resin composition having more excellent solvent resistance and water resistance.

──────────────────────────────────────────────────の Continuation of the front page (51) Int.Cl. ⁷ identification code FI G03F 7/021 G03F 7/021 (58) Investigated field (Int.Cl. ⁷ , DB name) G03F 7/032 G03F 7/021 B41N 1/24 C08F 2/22 C08F 261/04 C08L 51/06

Claims (3)

(57) [Claims] 1. A (A) a ₁₎ poly polymerization degree of 300 to 3,000
Vinyl alcohol resin (However, polymerization degree is 1500 or less
Excluding those) and a ₂₎ diazonium-based photocrosslinking agent and (C)
A screen plate-making resin composition comprising a polymer obtained by emulsion polymerization of a polymerizable compound containing at least 20% by weight of a compound having three or more unsaturated double bonds in a molecule. 2. Polymerizable compounds having three or more unsaturated double bonds in the molecule include trimethylolpropane tri (meth) acrylate, trimethylolethane tri (meth) acrylate, and trimethylolpropane propylene oxide-modified tri (meth) ) Acrylate, hydroxybivalylaldehyde-modified dimethylolpropane tri (meth) acrylate, pentaerythritol tri (meth)
Acrylate, pentaerythritol tetra (meth) acrylate, dipentaerythritol penta (meth) acrylate, dipentaerythritol hexa (meth) acrylate, dipentaerythritol triacrylate tripropionate, dipentaerythritol tetraacrylate dipropionate, dipentaerythritol penta Acrylate monopropionate, pentaerythritol ethylene oxide modified tri (meth) acrylate, dipentaerythritol caprolactone modified hexa (meth) acrylate, glycerin propylene oxide modified tri (meth) acrylate, tris (acroyloxyethyl) isocyanurate, tris acro Yloxyethyl phosphate, 1,3,5-triacryloylhexahydro- - screen plate resin composition according to claim 1, wherein using one or more components selected from the group of triazines. " 3. Polyvinyl alcohol having a size of 300 to 3000
A polymerizable compound containing at least 20% by weight of a compound having three or more unsaturated double bonds in a molecule thereof in an aqueous solution of a toluene- based resin (excluding those having a polymerization degree of 1500 or less). A method for producing a screen plate-making resin composition, which comprises emulsion polymerization. "