JPH03246548A - Production of planographic printing plate requiring no dampening water - Google Patents

Abstract

PURPOSE:To obtain a good vacuum adhesive property and dot reproducibility without detriment to a photosensitive layer at the time of matting by previously fixing solid particles via a heating means on a light transmissive film and thereby matting the film before the light transmissive film layer is formed on a silicone rubber layer or photosensitive silicone rubber layer. CONSTITUTION:The solid particles are previously fixed via the heating means to the light transmissive film to matt the film before the light transmissive film layer is formed on the silicone rubber layer or the photosensitive silicone rubber layer. A silane coupling agent is preferably incorporated into the silicone rubber layer in order to improve the adhesiveness to the photosensitive layer. The photosensitive layer is not needed in the case of the photosensitive silicone rubber layer. The light transmissive film layer may be one layer of resin film and may be the films laminated with >=2 layers. The good vacuum adhesive property and dot reproducibility are obtd. without detriment to the photosensitive layer at the time of matting in this way.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a method for producing a lithographic printing plate material that does not require dampening water, and more specifically, it is possible to improve halftone reproducibility while improving vacuum adhesion. The present invention relates to a method for producing a lithographic printing plate material that does not require dampening water.

[Conventional technology]

To form an image on a lithographic printing plate material that does not require dampening water,
Normally, the original image is exposed to actinic light, but in order to faithfully reproduce the original image, it is necessary to bring the original image into complete contact with the upper surface of the printing plate. For this reason, in boat fishing, a vacuum adhesion method has been used in which the printing plate and the original are placed one on top of the other between a rubber sheet and a pressure-bonded glass, and the space between the rubber sheet and the pressure-bonded glass is evacuated to bring them into close contact.

However, it is difficult to achieve sufficient vacuum adhesion, and various techniques have been proposed to improve this.

Conventionally, a method of matting a cover film is known in order to improve vacuum adhesion.

Methods of matting the cover film include a method of matting the cover film after laminating the cover film, and a method of matting the cover film before laminating the cover film.

[Problem to be solved by the invention]

As a method for matting a cover film after laminating it, a method is known in which a coating liquid containing inorganic particles or the like is coated and then dried.

However, such a matte processing method has a problem in that the photosensitive layer is attacked by the solvent used and the heat during drying.

Furthermore, if such matte processing fails, the entire plate material becomes defective, resulting in a large economic loss in the production of the plate material.

In addition, methods for matte processing before laminating the force/he film include: - Adding inorganic additives such as 5i02 and TiO2, adding organic polymers that are incompatible with the main polymer, and adding crystallization promoters. Methods of surface treatment (for example, corona treatment, etc.), matte finishing methods such as mechanical embossing are known (Japanese Unexamined Patent Publication No. 5
5-55343).

However, method (1) above has the disadvantage that since additives are added at the stage of manufacturing the cover film, it is difficult to disperse the additives, resulting in insufficient vacuum adhesion. Furthermore, there is a drawback that sufficient vacuum adhesion cannot be obtained even if matte processing is performed using the surface treatment (2). Furthermore, method (2) requires large equipment for mechanical embossing, and has the disadvantage that it cannot be easily matted.

For this reason, a method has also been proposed in which a smooth film is coated with a coating liquid containing inorganic particles.

However, even with this method, there are problems with the dispersibility of inorganic particles, etc., and the desired unevenness cannot be reproduced well, resulting in insufficient vacuum adhesion. By applying
After making a film with an uneven pattern corresponding to the engraving of the gravure roll, the film is laminated so that the smooth surface (surface without unevenness) is in contact with the silicone rubber layer, thereby creating a matte layer on the cover film. A method of providing a
(See No. 8).

However, in matting by such a gravure coating method, there is a limit to the number of mattes, so there are problems in that vacuum adhesion is poor and halftone dot reproducibility is insufficient.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a method for producing a lithographic printing plate material that does not require dampening water and that does not harm the photosensitive layer during matte processing, further improves vacuum adhesion and improves dot reproducibility. It is in.

[Means to solve the problem]

As a result of intensive studies to achieve the above object, the inventors have arrived at the present invention.

That is, the method for producing a dampening water-free planographic printing plate material according to the present invention provides a dampening water-free planographic plate having a photosensitive layer, a silicone rubber layer or a photosensitive silicone rubber layer, and a light-transmitting film layer on a support. In the method for producing a printing plate material, before forming a light-transparent film layer on the silicone rubber layer or the photosensitive silicone rubber layer, by fixing solid particles to the light-transparent film in advance via heating means. It is characterized by a matte finish.

In a preferred embodiment of the present invention, thermoplastic resin particles are dispersed on a light-transmitting film layer.

Examples include heat-sealing and fixing on the light-transmitting film layer to give a matte finish, and other preferred embodiments include:
Spraying a liquid thermosetting resin onto a light-transparent film layer to form liquid particles, and then curing the resin by heating to fix solid particles on the light-transparent film layer to achieve matte processing. can be mentioned.

[Structure of the invention]

The lithographic printing plate material that does not require dampening water (hereinafter simply referred to as "plate material" as necessary) obtained by the production method of the present invention is:
A photosensitive layer, a silicone rubber layer, and a light-transmitting film layer that has been matted in advance are formed on a support.

Note that the photosensitive layer and the silicone rubber layer may be a single layer of photosensitive silicone rubber, or a primer layer may be provided between the support and the photosensitive layer, and the photosensitive layer and the silicone rubber layer may be a single layer. An adhesive layer may be provided between the layers.

The configuration of typical layers will be explained below.

(Support) The support used in the present invention is preferably one that is flexible enough to be set in a normal lithographic printing machine and that can handle the load applied during printing, such as aluminum, zinc, copper, steel, etc. Metal plates, metal plates plated or vapor-deposited with chromium, zinc, copper, nickel, aluminum, iron, etc. 1 paper, plastic films and glass plates, resin coated paper, paper covered with metal foil such as aluminum, hydrophilic Examples include treated plastic films. Among these, aluminum plates are preferred.

When an aluminum plate is used, it may be subjected to surface roughening treatment such as grain treatment and anodizing treatment.

The thickness of the support is preferably 50 to 400 mm, more preferably 100 to 300 mm.

(Primer layer) A primer layer may be formed on the support by coating.

The primer layer preferably contains a resin and, if necessary, a curing agent, various additives, a silane coupling agent, and an organic titanate agent.

As the resin, for example, polyester resin, vinyl chloride
Vinyl acetate copolymer, acrylic resin, vinyl chloride resin,
Examples include polyamide resin, polyvinyl butyral resin, epoxy resin, acrylate copolymer, vinyl acetate copolymer, phenoxy resin, polyurethane resin, polycarbonate resin, polyacrylonitrile butadiene, polyvinyl acetate, and the like. Among these, resins obtained by photocrosslinking or thermally crosslinking copolymer resins of (meth)acrylic esters having alcoholic OH groups, such as 2-hydroxyethyl methacrylate, are preferred.

The primer layer used in the present invention is preferably crosslinked in order to improve solvent resistance to the coating solvent of the photosensitive layer and the organic solvent of the developer.

As the component to be crosslinked, polyvalent isocyanate compounds, diazo resins, polyvalent epoxy compounds, compounds having two or more polymerizable ethylenically unsaturated double bonds, etc. are used.

Examples of polyvalent incyanate compounds include diphenylmethane-4,4'-diincyanate, hexamethylene diisocyanate, and Coronate E.

Examples include HL and EH (manufactured by Nippon Polyurethane Industries, Ltd., polyvalent incyanate compounds).

Examples of the diazo resin include 4-diazodiphenylamine, hexafluorophosphate-formaldehyde resin, 3-methoxy-diphenylamine-4-diazonium salt and 4,4'-
Examples include mesitylene sulfonate salt of a condensate of bis-methoxymethyl-diphenyl ether.

Examples of the polyvalent epoxy compound include bisphenol epoxy resin, bisphenol F diglycidyl ether, novolac glycidyl ether, hexahydrophthalic acid glycidyl ether, triglycidyl isocyanurate, and the like.

Examples of the compound having two or more polymerizable ethylenically unsaturated double bonds include trimethylolpropane triacrylate, tetramethylolmethane triacrylate, allyl acrylate, and 1,4-butanediol dimethacrylate. In addition, when using a compound having an ethylenically unsaturated double bond, a polymerization initiator or a photopolymerization initiator is used together.

Among the above crosslinking agents, diazo resins are preferred.

(Photosensitive layer) A photosensitive layer is formed on the support or primer layer by coating or the like.

The structure of the photosensitive layer is not particularly limited, and various photosensitive substances can be used. Representative examples will be explained below.

First, quinonediazide-type positive photosensitive materials such as conventionally known 0-naphthoquinonediazide compounds are mentioned.

Suitable O-naphthoquinone diazide compounds include naphthoquinone-(1,2)-diazide-(2)-sulfonic acid chloride and phenol or cresol- There are esters with formaldehyde resins. 0- for other terms
Examples of naphthoquinone diazide compounds include those described in US Patent No. 3. Ester of pyrogallol-acetone resin and 0-naphthoquinonediazide sulfonic acid chloride described in Ei 35,709, polyhydroxy described in JP-A-55-78346, JP-A-58-1044 and JP-A-5FL-1045. Ester of phenyl resin and 0-naphthoquinonediazide sulfonic acid chloride, JP-A-1987
A homopolymer of P-hydroxystyrene as described in No. 113305 or a copolymer of this and other copolymerizable monomers with 0-naphthoquinonediazide sulfonic acid chloride, ester-reacted with 0-naphthoquinonediazide sulfonic acid chloride.
Examples thereof include a reaction product of a polymer product of a styrene monomer and a phenol derivative described in No. 9-17481 and 0-quinonediazide sulfonic acid, and an ester of polyhydroxybenzophenone and 0-naphthoquinonediazide sulfonic acid chloride.

A binder may be added to a photosensitive composition containing such a quinonediazide type photosensitive substance, if necessary.
For example, suitable examples include novolac resins soluble in aqueous alkaline solutions. Typical examples of such novolac resins include phenol-formaldehyde resin, cresol-formaldehyde resin, p-tert-butylphenol-formaldehyde resin, and phenol-modified xylene resin.

The amount of quinonediazide compound in the photosensitive composition is 10-5
It is 0% by weight, more preferably 20 to 40% by weight. In addition, the amount of the above-mentioned binder is 45 to 45% in the photosensitive composition.
It is 80% by weight, preferably 50 to 70% by weight.

Further, as the photosensitive substance, a diazo resin typified by a condensate of an aromatic diazonium salt and formaldehyde is also used.

Particularly preferred are salts of condensates of p-diazodiphenylamine and formaldehyde or acetaldehyde, such as hexafluorophosphates, tetrafluoroborates,
A diazo resin inorganic salt which is a reaction product of a perchlorate or a periodate and the above-mentioned condensate, and U.S. Pat.
Examples include diazo resin organic salts, which are reaction products of the above condensate and sulfonic acids, as described in No. 309. Furthermore, diazo resins are preferably used together with binders. Various polymer compounds can be used as such a binder, but monomers having an aromatic hydroxyl group such as those described in JP-A No. 54-98613, such as N-(4-hydroxyphenyl ) acrylamide, N-(4-hydroxyphenyl)methacrylamide, o-, m-2 or p~hydroxystyrene, o-
, copolymer of m-1 or p-hydroxyphenyl methacrylate, etc. with other monomers, U.S. Pat. No. 4,123,2
Polymers containing hydroxyethyl acrylate units or hydroxyethyl methacrylate units as a main repeating unit as described in US Pat. No. 76, natural resins such as shellac and rosin, polyvinyl alcohol, polyamide resins, linear polyurethane resins as described in U.S. Pat. class is included.

Also, CH=CH as a photosensitive group in the main chain or side chain of the polymer.
- Polyesters containing -C knee, polyamides 1, polycarbonates, etc., whose main component is a photosensitive polymer are also included. For example, JP-A-55-404
15, photosensitive polyesters obtained by condensation of phenylene diethyl acrylate with hydrogenated bisphenol A and triethylene glycol; cinnamylidene, as described in U.S. Pat. No. 2,956,878; Examples include photosensitive polyesters derived from (2-properidene) malonic acid compounds such as malonic acid and difunctional glycols.

Further examples include aromatic azide compounds in which the azide group is bonded directly or via a carbonyl or sulfonyl group to an aromatic ring. For example, polyazidostyrene as described in U.S. Pat. No. 3,096,311; Polyvinyl-p-azidobenzoate, polyvinyl-p-azidobenzal, the reaction product of azidoarylsulfanyl chloride and unsaturated hydrocarbon polymer described in Japanese Patent Publication No. 45-8613, and Japanese Patent Publication No. 43-21067, No. 44-229, No. 44-22954 and No. 45-2
Examples include polymers having sulfonyl azide and carbonyl azide, as described in No. 4915.

Furthermore, a photopolymerizable composition comprising an addition polymerizable unsaturated compound may also be mentioned.

The thickness of the photosensitive layer is preferably 0.05 to IOpm, more preferably 0.1 to 2 pm.

In the present invention, the photosensitive material may further contain fillers, dyes, dyes, pigments, surfactants for improving coating properties, and other conventional additives and auxiliaries.

(Silicone Rubber Layer) A silicone rubber layer is formed on the photosensitive layer by coating. The silicone rubber used in the silicone rubber layer is mainly composed of a linear organic polysiloxane having the following repeating units and an OH group in the main chain or at the end of the main chain with a molecular weight of several thousand to several tens of blades. Preferably.

÷Si -09 where n is an integer of 2 or more, R is an alkyl group having 1 to 10 carbon atoms, a halogenated alkyl group, a vinyl group, an aryl group, or a silanol group (OH group), and 60% or more of R is A methyl group is preferred.

The silanol group (OH group) may be located either in the main chain or at the end of the main chain, but is preferably located at the end.

The silicone rubber useful in the present invention is obtained by a condensation reaction between such a silicone base polymer and a silicone crosslinking agent as listed below.

(1) R-3i-(-OR') (2) R-Si+0Ac) (3) R-3i-(-ON=CR'z)2 Here, R has the same meaning as R explained earlier, R' is an alkyl group such as a methyl group or an ethyl group, and AC is an acetyl group.

These silicone rubbers are also available as commercial products, such as YE-3085 manufactured by Toshiba Silicone Corporation.

Other useful silicone rubbers can be produced by reacting the base polymers listed above with silicone oils having the following repeating units, or by reacting silicone base polymers in which about 3% of R is vinyl groups. addition reaction,
Alternatively, it can also be obtained by a reaction between the silicone oils.

HR (In the formula, R has the same meaning as R above, m is an integer of 2 or more, and n is an integer of 0 or 1 or more.) In order to obtain silicone rubber by such a crosslinking reaction, In addition to the above ingredients, organic carboxylates of metals such as tin, zinc cobalt, lead, calcium, and manganese, such as dibutyltin laurate, tin(II) octoate, cobalt naphthenate, etc., or catalysts such as chloroplatinic acid. is added.

In addition, in order to improve the strength of silicone rubber and obtain silicone rubber that can withstand the frictional forces generated during printing operations,
Silicone rubber pre-mixed with filler, which can also be mixed with a filler, is commercially available as silicone rubber paste/reply or silicone rubber dispersion. If it is preferred to obtain a rubber film, R
Tv or LTV silicone rubber dispersions are preferably used. An example of this is
Syl Off 23.5RX- manufactured by D-N Co., Ltd.
There are silicone rubber dispersions for paper coating such as 257, 5H237.

In the present invention, in addition to the above-mentioned components, a small amount of photosensitizer can be included in the silicone rubber layer.

Preferably, the silicone rubber layer further contains a silane coupling agent to improve adhesion to the photosensitive layer.

Examples of silane camping agents include the following.

(a) HaNCl(2CH2NHCCH2CLCLSL(O
CL) y(C) H3(CL)+5i(QC,)l:
+):+(d) C11t=IjlSi(0(:O(:
)I:+)z(e)C)12-C-COO((:H2)
3Si(0(:H3)zCH.

(f) CHz=(:H5I(OCII-CH:+)3
(g) HJCH2CHaNII(CHi)3si(O
CHz)a(C1b)(h) The thickness of the chlorosilane silicone rubber layer is preferably 0.1 to 10P, more preferably 0.5 to 2P! It is 1.

Note that in the case of forming a photosensitive silicone rubber layer, a photosensitive layer is not necessary, and such a photosensitive silicone rubber may include γ-methacryloxypropyltrimethoxysilane or 100-cinnamoyl ethoxysilane at the terminal OH group of dimethylpolysiloxane. Examples include compounds obtained by dealcoholization condensation of , or compounds obtained by adding a bisazide compound to bodgeorganosiloxane, or reacting acryloyl chloride or P-azidobenzoate.

(Light Transparent Film Layer) Examples of resins used for the light transparent film layer include polyolefins such as polypropylene, polyethylene, polymethylpentene, and ethylene-butene copolymers, polystyrene, fluororesins, polyethylene terephthalate, nylon, polyvinyl alcohol, Examples include polycarbonate, polymethyl methacrylate, polyimide, polyacrylonitrile, and the like.

The light-transmissive film layer may be a single layer of the resin film described above, or may be a laminated film of two or more layers.

The thickness of one light-transmissive film layer is 0.5 to 20 g.
m is preferred, and more preferably 3 to 8 gta.

In the present invention, before a light-transmitting film layer is formed (for example, laminated) on the silicone rubber layer, solid particles are fixed to the light-transparent film using a heating means to give it a matte finish. It is a feature.

A method for matte processing is a method in which thermoplastic resin particles are dispersed onto a light-transparent film layer and then thermally fused and fixed onto the light-transparent film layer (so-called powdering method).
There is.

Examples of thermoplastic resin particles used in this method include polyethylene, polymethyl methacrylate, polystyrene, phenolic resin, ionomer resin,
Thermoplastics such as ABS resin, ethylene-vinyl acetate copolymer, vinyl chloride resin, polyamide resin, fluororesin, polyester resin, epoxy resin (before curing), styrene-(meth)acrylic acid or methacrylic acid ester copolymer resin There is resin.

In addition, when using a solid thermosetting resin that still has thermoplasticity before curing (e.g. epoxy resin), the resin is pulverized into powder and then classified to form a powder within a certain range. A method can be adopted in which only particles of a certain size are separated, dispersed on a light-transmissive film layer, and then the particles are thermally fused by heating and at the same time the resin is cured.

Another method for matte processing is to spray a liquid thermosetting resin onto a light-transparent film layer to form liquid particles, and then harden the resin by heating to form a liquid on the light-transparent film layer. There is a method (liquid spray method) for fixing solid particles.

Thermosetting resins include, for example, epoxy resins, phenol resins, unsaturated polyester resins, and other resins in which a curing agent is added.

In addition to the thermoplastic or thermosetting resin, the particles used in the powdering method or liquid spraying method include silicon dioxide, zinc oxide, titanium oxide, zirconium oxide, glass particles, alumina, and starch. It may be coated with a synthetic resin.

In the present invention, the solid particles used are those that can substantially transmit the active light rays for exposure, but the solid particles contain an ultraviolet absorber, yellow dye, yellow pigment, etc. in order to prevent the harmful effects of scattered light caused by the solid particles. You can also do it.

Next, a method for producing a printing plate that does not require dampening water using the plate material obtained by the production method of the present invention will be described.

A positive film, which is the manuscript, is vacuum-adhered to the surface of the plate and exposed. As a light source for this exposure, a mercury lamp, a carbon arc lamp, a xenon lamp, a metal halide lamp, a fluorescent lamp, etc., which generate abundant ultraviolet light, are used.

At this time, the vacuum adhesion is improved due to the presence of the light-transmitting film that has been matted in advance.

After exposure, the light-transmissive film is peeled off and developed with a developer to remove only the silicone rubber layer and photosensitive layer or silicone rubber layer in the unexposed areas.

A printing plate in which the recessed image portion is formed can be obtained as described above.

〔Effect of the invention〕

According to the present invention, it is possible to provide a method for producing a lithographic printing plate material that does not require dampening water and can improve halftone reproducibility while further improving vacuum adhesion without harming the photosensitive layer during matte processing. .

〔Example〕

The present invention will be explained in more detail below with reference to one example, but the present invention is not limited to these examples.

Example 1 (Synthesis of diazo resin-1) P-diazodiphenylamine sulfate 14.5. (50
mmol) was dissolved in 40.9 g of concentrated sulfuric acid under water cooling.

1.35 g (45 mmol) of paraformaldehyde was slowly added to this reaction solution so that the reaction temperature did not exceed 10°C.

This reaction mixture was added dropwise to 5001 ethanol under water cooling, and the resulting precipitate was filtered. After washing with ethanol, this precipitate was dissolved in 1001 pure water, and 6.8g was added to this solution.
A cold concentrated aqueous solution of zinc chloride was added. After filtering the resulting precipitate, it was washed with ethanol and filtered at 150 m
1 Dissolved in pure water. To this liquid was added a cold concentrated aqueous solution in which 8 g of ammonium hexafluorophosphate was dissolved. The resulting precipitate was filtered, washed with water, and then dried to obtain diazo resin-1.
I got it.

(Manufacture of aluminum plate) An aluminum plate with a thickness of 0.24 mm was immersed in a 3% aqueous sodium hydroxide solution to degrease it, washed with water, and then immersed in a 32% aqueous sulfuric acid solution at a temperature of 30°C under the conditions of 5 A/drn' for 10 Anodized for 2 seconds, washed with water, immersed in a 2% sodium metasilicate aqueous solution at a temperature of 85°C for 37 seconds, further immersed in water (pH 8.5) at a temperature of 90°C for 25 seconds, washed with water,
It was dried to obtain an aluminum plate.

(Preparation of plate material) A primer layer composition having the following composition was applied to an aluminum plate, and after drying at 85°C for 3 minutes, the entire surface was exposed to light at 100 hJ/crn' using a 3KW ultra-high pressure mercury lamp. It was further dried at 100° C. for 4 minutes to form a primer layer with a thickness of 0.8 pH.

[Primer layer composition] Diazo resin - 18 parts by weight Copolymer resin of 2-hydroxyethyl methacrylate and methyl methacrylate in a molar ratio of 34/6B - 192 parts by weight Methyl cellosolve 900 parts by weight Next, the following composition was applied on the above brimer layer. Apply a photosensitive composition of 10
It was dried at 0° C. for 2 minutes to form a photosensitive layer with a thickness of 0.3 Lulo.

[Photosensitive composition] Diazo resin - 150 parts by weight Copolymer resin of 2-hydroxyethyl methacrylate and N (4-hydroxyphenyl) methacrylamide in a molar ratio of 20,780 - 150 parts by weight Victoria Pure Blue BOH (dye manufactured by Odugaya Kagaku ■) ) 1 part by weight methyl cellosolve
900 parts by weight of the silicone rubber composition shown below was then applied onto the photosensitive layer at a dry weight of 1.8 g/rrf and dried at 80° C. for 4 minutes.

[Silicone rubber layer composition] 100 parts by weight of dimethylpolysiloxane having hydroxyl groups at both ends (molecular weight 8
2,000) Triacetoxymethylsilane 10 parts by weight Dibutyltin laurate 0.8 parts by weight Isopar E (manufactured by Esso Chemical) 900 parts by weight Next, before laminating the polypropylene film on the silicone rubber layer, as follows. Matte finish.

First, a polypropylene film with a thickness of 5 μm was prepared. Next, a copolymer resin with a molar ratio of styrene:methyl methacrylate:nibutyl acrylate (acrylic acid) = 30:30:30:10 and a melting point of 95°C was crushed and then classified. ,
The powder obtained by separating particles with a particle size of 10 to 6 mm was powdered on the polypropylene film, and heated at 120°C for 30 minutes.
It was heated for a second to thermally fuse it and give it a matte finish. The number of mats at this time was 550 mats/c112.

Next, a matted polypropylene film was laminated onto the silicone rubber layer to form a light-transmissive film layer to obtain a plate material of the present invention.

After vacuum-adhering the positive film to the top surface of the above plate material,
Exposure was performed using a metal halide lamp as a light source, and the light-transmitting film layer was peeled off.

Next, after immersing it in developer-1 or developer-2 below for 1 minute, the surface of the plate material is rubbed with a pad impregnated with the developer to separate the unexposed portions of the silicone rubber layer and the photosensitive layer. A printing plate was obtained in which approximately 89% of the original halftone dots were well reproduced.

Further, the image area of the above printing plate could be vividly dyed by applying a dyeing liquid having the composition shown below to a cloth, lightly rubbing the plate, and then washing with water.

(Developer solution-1) β-anilinoethanol 0.5 parts by weight Propylene glycol 1.0 parts by weight p -
Tert-butylbenzoic acid 1.0 parts by weight Potassium hydroxide 1.0 parts by weight Polyoxyethylene lauryl ether 0.2 parts by weight Potassium sulfite 2.0 parts by weight Potassium metasilicate 3.0 parts by weight Water
91 parts by weight 8 parts by weight Anion manufactured by Truss Co., Ltd. 5 parts by weight 2 parts by weight 85 parts by weight (Developer-2) Benzyl alcohol Perex NBL (35% aqueous solution of Kao surfactant) Jetanolamine water (staining solution) Turfitz (Kuraray) Solvent manufactured by Isoprene Chemical ■ 20 parts by weight Rheodol TW-0120 (Kao Soda Surfactant) 0.5
Parts by weight Benzyl alcohol 5.0 parts by weight Victoria Pure Blue B OH 1.0 parts by weight Water
100 parts by weight Example 2 Thickness 5 having the following composition on a 0.24 m+a aluminum plate
A photopolymerizable photosensitive layer of the end intestine was provided.

a, Solid substance of unsaturated polyester “Polylite TDR-1131RJ” manufactured by Dainippon Ink Chemical Co., Ltd. (Bispheno-J
l/A, polycondensate of propylene oxide and maleic anhydride) 40% by weight b, addition reaction product of 4 moles of glycidyl methacrylate and 1 mole of xylylene diamine 55% by weight C, benzoin methyl ether 5% by weight On this photosensitive layer RTV silicone rubber disversion r manufactured by Toshiba Silicone Co., Ltd.
YE-3085J was diluted with n-heptane, applied, and dried to provide a silicone rubber layer with a thickness of 2 mm.

Next, a polypropylene film having a thickness of 5 JL and matted as described below was laminated on the silicone rubber layer to form a light-transmitting film layer to obtain a plate material of the present invention.

(Matt processing) Apply the following coating solution to the surface of a 10g+m thick polypropylene film using an electrostatic air type sprayer, and apply it to +20°.
C. for 3 minutes. The number of mats at this time was 600.
It was Ke/C Maro 2.

(Coating liquid) Epicor 1001 100 parts by weight Methyltetrahydrophthalic anhydride 3B parts by weight 2.
4.8-) Lis(dimethylaminomethyl)phenol 10 parts by weight water
1000 parts by weight Surfactant 5 parts by weight [Sorbitan monolaurate (Kao)] A positive film was applied to this printing plate material, and the light from a 3 Kw ultra-high pressure mercury lamp was applied from a distance of 1 meter for 30 minutes with a vacuum contact time of 30 seconds. After irradiating for a minute and peeling off the light-transmitting film, the film was immediately developed with n-hebutane, and the silicone rubber layer in the unexposed areas was removed, yielding a lithographic printing plate that faithfully reproduced the positive film.

Comparative Example 1 In Example 2, after laminating a polypropylene film that had not been matted in advance, a coating solution for matting was similarly applied by electrostatic spraying, and the film was heated at 120°C for 5 minutes (until the mat was attached). Dry.

At this time, the number of mats was 550/C112.

Thereafter, exposure and development were carried out in the same manner as in Example 2 to produce a printing plate.

However, uneven development occurred, likely due to the heat applied when drying the mat, and polka dot-like spots appeared, likely due to penetration of the water used as a solvent, making it unsatisfactory as a printing plate. .

Claims (1)

[Scope of Claims] 1. A method for producing a dampening water-free lithographic printing plate material having a photosensitive layer and a silicone rubber layer or a photosensitive silicone rubber layer and a light-transmitting film layer on a support, wherein the silicone rubber A dampening solution characterized in that, before forming a light-transparent film layer on a layer or a photosensitive silicone rubber layer, solid particles are fixed to the light-transparent film in advance through heating means to give it a matte finish. A method for producing unnecessary lithographic printing plate material. 2. The dampening dampener according to claim 1, characterized in that thermoplastic resin particles are dispersed on the light-transmitting film layer and thermally fused to adhere to the light-transparent film layer for matte processing. A method for producing a water-free lithographic printing plate material. 3. Spray a liquid thermosetting resin onto the light-transparent film layer to form liquid particles, and then harden the resin by heating to fix the solid particles on the light-transparent film layer for matte finishing. 2. The method for producing a lithographic printing plate material that does not require dampening water according to claim 1.