JPH02115851A - Damping-waterless planographic printing plate - Google Patents

Abstract

PURPOSE:To increase the adhesive strength of the photosensitive layer and silicone rubber layer and to enhance the plate wear of the printing plate by incorporating a specific compd. into the photosensitive layer. CONSTITUTION:This printing plate material is constituted by providing the photosensitive layer (A) and the silicone rubber layer (B) successively via a primer layer at need on a base consisting of an Al plate, etc. The compd. having the unit expressed by the formula I and a photopolymn. initiator (e.g.; benzophenone) are incorporated into the layer A. In the formula, R, R' denote H, methyl; X denotes (substd.) phenylene, prescribed carboxyl, etc., and the polymer having the unit expressed by the formula II or the like is usable for the above-mentioned compd. The silicone rubber formed by the condensation reaction of a base polymer, such as linear org. polysiloxane, having a hydroxyl group in the main chain or at the terminal of the main chain, and a crosslinking agent is usable for the layer B.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to a lithographic printing plate material that does not require dampening water, and more specifically, has improved adhesion between a silicone rubber layer and a photosensitive layer, and is suitable for use in printing. This invention relates to an excellent lithographic printing plate material that does not require dampening water and has improved printing durability when applied.

[Background of the Invention] Conventionally, as a lithographic printing plate material that does not require dampening water (hereinafter referred to as a 1st plate material if necessary), one in which a photosensitive layer and an ink repellent layer are sequentially coated on a support is known. ing. By exposing and developing this plate material, a lithographic printing plate that does not require dampening water (hereinafter referred to as "printing plate" as necessary) can be obtained.

Techniques using silicone rubber as a material constituting the ink repellent layer are known (for example, Japanese Patent Laid-Open No. 50-59
103), the silicone rubber layer originally has insufficient adhesion with the photosensitive layer, and printing plates obtained from this plate material do not have sufficient rigidity, and the plate material cannot be used for long periods of time. If it is stored, its adhesive strength decreases, and it has the disadvantage that a sufficient image cannot be obtained.

The main methods for improving the adhesion between the photosensitive layer and the silicone rubber layer include, for example, improving the silicone rubber layer or providing an intermediate layer to improve the adhesion. However, there are ways to improve the photosensitive layer.
In this case, the type of photosensitive layer also affects the adhesion with the silicone rubber layer, and especially when a (meth)acrylate-based photopolymerizable composition is used as the photosensitive layer, the adhesion with the silicone rubber layer is affected. It has the disadvantage of not being sufficient.

Further, U.S. Pat. No. 3,890,149 discloses a plate material having a silicone rubber layer adjacent to the photosensitive layer,
It is disclosed that a diazonium salt is used as a photocationic polymerization initiator in some of the components of the photosensitive layer. However, this plate material has poor printing durability when stored raw, that is, it has poor storage stability, and when this plate material is used,
There is a drawback that gas is generated during exposure and the silicone rubber layer tends to peel off easily, and scratch resistance during development is poor.

Therefore, the present inventors conducted various studies on the adhesion between the photosensitive layer and the silicone rubber layer, focusing on improving the photosensitive layer.
] It was discovered that by using a compound having a specific structural unit represented by the formula, a plate material having good adhesion to the silicone rubber layer and excellent stiffness resistance could be obtained, and the present invention was developed based on this finding.

[Objective of the Invention] The object of the present invention is to provide planographic printing that does not require dampening water and can form a printing plate that has good adhesion between a photosensitive layer and a silicone rubber layer and has excellent printing durability when printed. The goal is to provide printing materials.

[Structure of the Invention] Therefore, the object of the present invention is to provide a lithographic printing plate material that does not require dampening water and has a photosensitive layer and a silicone rubber layer in this order on a support, in which the photosensitive layer is formed by (A) the general formula [I ] This was achieved by a lithographic printing plate material that does not require dampening water and is characterized by containing a compound having the structural unit shown in the following formula and (B) a photopolymerization initiator.

General formula [I] [wherein R represents a hydrogen atom or a methyl group, and R' represents a hydrogen atom or a methyl group.

Further, X represents a phenylene group, a substituted phenylene group, a phenylene group, a carboxyl group or an amide group having a hydrocarbon having 1 to 10 carbon atoms, a halogenated hydrocarbon, or a polyether group as an ester group. [Function] The present invention contributes to the adhesion between the photosensitive layer and the silicone rubber layer through a crosslinking effect by using a compound having a specific structural unit represented by the general formula [I] as one component of the photosensitive layer. to increase the adhesion between these eyebrows and create a strong bond. As a result, a plate material capable of forming a printing plate with excellent printing durability etc. is obtained.

[Specific configuration of the present invention] The present invention will be explained in more detail below.

The lithographic printing plate material of the present invention that does not require dampening water has a
The basic layer structure is a photosensitive layer and a silicone rubber layer in this order, but the present invention is characterized by the photosensitive layer, and specifically, the photosensitive layer has a structural unit represented by (A) -DI formula N]. and (B) a photopolymerization initiator.

(A) Compound having a structural unit represented by the general formula [I] [In the formula, R represents a hydrogen atom or a methyl group, and R' represents a hydrogen atom or a methyl group.

Further, X represents a phenylene group, a substituted phenylene group, a phenylene group, a carboxyl group or an amide group having a hydrocarbon having 1 to 10 carbon atoms, a halogenated hydrocarbon, or a polyether group as an ester group. ] As a substituent of the substituted phenylene group represented by As carboxyl groups, resins having a structural unit represented by the general formula [I] used in the present invention include, for example, the following. ] The resin having the structural unit represented by is obtained by a polymer reaction between the main chain resin and 2-isocyanate ethyl (meth)acrylate.

The resin serving as the main chain is not particularly limited, but specifically, various polymeric compounds having active hydroxyl groups are used, but preferably, US Patent Box 4,123.2
Examples include resins containing hydroxyethyl (meth)acrylate as a main repeating unit as described in Specification No. 76, or (meth)acrylate resins having glycidyl methacrylate, polyvinyl alcohol, polyethylene glycol, etc. as ester groups. .

The above-mentioned polymeric compound having an active hydroxyl group is produced by copolymerizing a monomer having an active hydroxyl group with another monomer. Preferred monomers having an active hydroxyl group are aromatic It is a monomer that has a family hydroxyl group, and it has an aromatic hydroxyl group! # For example, N-(
4-hydroxyphenyl)acrylamide, N-(4-
(hydroxyphenyl) methacrylamide, o-, m- or p-hydroxystyrene, or o-, m- or p-hydroxyphenylacrylate, o-, m- or p-hydroxyphenyl methacrylate, and the like.

Other monomers that can be copolymerized with this monomer having an aromatic hydroxyl group include styrene or its alkyl-substituted conductor, alkyl acrylate, aryl acrylate, alkyl methacrylate, aryl methacrylate. Examples include esters and fatty acid vinyl esters. Examples of preferred individual monomers among these are acrylic acid, methacrylic acid and methyl acrylate, ethyl acrylate, butyl acrylate, benzyl acrylate, methyl methacrylate, ethyl methacrylate, butyl methacrylate, methacrylic acid Examples include benzyl.

The resin that becomes the main chain obtained by combining the above-mentioned individual monomers, which are monomers having an aromatic hydroxyl group, and the above-mentioned individual monomers, which are other monomers, is For example, copolymers of N-(4-hydroxyphenyl)acrylamide and methyl acrylate, ethyl acrylate, benzyl acrylate, methyl methacrylate or ethyl methacrylate, N-(4-hydroxyphenyl)acrylamide and Copolymers of methyl acrylate, ethyl acrylate, benzyl acrylate, methyl methacrylate or ethyl methacrylate, o-, m- or p-hydroxyphenylacrylate and methyl acrylate, ethyl acrylate, benzyl acrylate, Examples include copolymers with methyl methacrylate or ethyl methacrylate.

Below, a synthesis example of a copolymer resin of a compound having a structural unit represented by the general formula [I] and methyl methacrylate used in the present invention will be shown.

Synthesis Example 500 g of toluene was added in a 300 m° C. four-necked flask equipped with a dropping funnel, stirrer, reflux condenser and thermometer.
mρ, 2-hydroxyethyl methacrylate 250mm
Add 250 mmol of methyl methacrylate.

Subsequently, after purging the inside of this flask sufficiently with nitrogen, 80
The mixture was immersed in a thermostatic water bath at a temperature of 0.degree. C. and stirred while flowing nitrogen, and when the temperature reached 80.degree. C., 10 mJ2 of a 1 molar solution of azobisisobutylnitrile was dropped at once from the dropping funnel. The reaction was continued for 24 hours. After a portion of the reaction solution was taken and gas chromatography was performed to confirm that no absorption of 1,000 yen was observed, the overall temperature was lowered to 60°C.

When the overall temperature reached 60°C, 5a+mol of dibutyltin dilaurate was added, and further 25Qmmol of 2-isocyanate ethyl methacrylate was added dropwise over 30 minutes. Subsequently, the mixture was stirred as it was for 3 hours, and after confirming that the infrared absorption spectrum of the isocyanate in the reaction mixture had disappeared, the mixture was lowered to room temperature, and then gradually added dropwise into 5 portions of hexane.

When the resulting solution was left to stand for 12 hours, a white resin was clearly precipitated. Hexane was removed by decantation, and the mixture was further filtered using a glass filter and dried under reduced pressure to obtain the desired resin with a yield of 93%.

Other resins having the structural unit represented by the general formula [I] used in the present invention can be easily synthesized in the art according to the synthesis example described above.

(B) Photopolymerization initiator The photopolymerization initiator used in the present invention as component (B) includes those conventionally used in this technical field, but the following are preferred. can be used.

Benzoin derivatives such as benzoin methyl ether, benzoin isopropyl ether, α, α-dimethoxy α-phenylacetophenone, benzophenone, 2.4-
Benzophenone derivatives such as dichlorobenzophenone, methyl 0-benzoylbenzoate, 4.4°-bis(dimethylamino)benzophenone, 4.4′-bis(diethylamino)benzophenone, 2-chlorothioxanthone,
Thioxanthone conductors such as 2-isopropylthioxanthone, anthraquinone conductors such as 2-chloroanthraquinone and 2-methylanthraquinone, acridone derivatives such as N-methylacridone and N-butylacridone, α.

α-jethoxyacetophenone, benzyl, fluorenone, xanthone, uranyl compound, halogen compound, etc.

In addition, vicinal boriketaldonyl compounds disclosed in U.S. Pat. No. 2,367.660;
α-carbonyl compounds disclosed in No. 367.661 and No. 2,367.670, No. 2,44
Asiloin ether disclosed in No. 8,828; α-hydrocarbon-substituted aromatic acyloin compounds disclosed in No. 2,722,512; No. 3,048,127 Polynuclear quinone compounds disclosed in No. 3 and No. 2,951,758;
The doryarylimidazole dimer/p-aminophenyl ketone combination disclosed in No. 49,367, the benzothiazole compound disclosed in No. 3,870,524, and the benzothiazole compound disclosed in No. 4,239. Benzothiazole compounds/triheromethyl-S-)-riazine compounds disclosed in No. 850 and No. 3 of the same
, acridine and phenazine compounds disclosed in , 751,259, and oxadiazole compounds disclosed in , 4,212,970.

The amount of these photopolymerization initiators used is about 0.5% to about 15% by weight, preferably 2% to 10% by weight, based on the total weight of the components constituting the photosensitive layer.

It is preferable to further add a thermal polymerization inhibitor to the photosensitive layer used in the present invention, such as hydroquinone, p-
Methoxyphenol, di-t-butyl-p-cresol, pyrogallol, t-butylcatechol, benzoquinone, 4.4'-thiobis(3-methyl-6-t-butylphenol), 2.2'-methylenebis(4-methyl -6-t-butylphenol), 2-mercaptobenzimidazole, and the like are useful.

The photosensitive layer used in the present invention mainly contains the above-mentioned components (A) and (B), but it is preferable to further add an unsaturated layer as described below.

Ethylene glycol di(meth)acrylate, polyethylene glycol di(meth)acrylate, trimethylolethane tri(meth)acrylate, trimethylolpropane tri(meth)acrylate, neopentyl glycol di(meth)acrylate, pentaerythritol and dipentaerythritol Tri, tetra or hexa(meth)acrylate, epoxy di(meth)acrylate, oligoacrylate as disclosed in Japanese Patent Publication No. 52-7361, acrylic urethane resin or acrylic as disclosed in Japanese Patent Publication No. 48-41708 These include urethane oligomers.

The composition ratio of these polymers or oligomers to the polymer (A) is preferably in the range of 1:9 to 7:3 by weight, and more preferably in the range of 1:3 to 1:1 by weight.

Furthermore, a binder can be added to the photosensitive layer used in the present invention, if necessary. Various polymeric compounds can be used as the preferred binder, but monomers having aromatic hydroxyl groups such as those described in JP-A No. 54-98613, such as N-(4-hydroxy Copolymers of phenyl)acrylamide, N-(4-hydroxyphenyl)methacrylamide, 0-1m-1 or p-hydroxystyrene, 0-1m-1 or p-hydroxyphenyl methacrylate, etc. and other monomers, Polymers containing hydroxyethyl acrylate units or hydroxyethyl methacrylate units as the main repeating unit as described in U.S. Pat. No. 4,123,276; Natural resins such as shellac and rosin; polyvinyl alcohol; 3,751,25
7, linear polyurethane resins as described in U.S. Pat. No. 3,660,097, phthalated resins of polyvinyl alcohol, bisphenol A and epichlorohydrin. Includes celluloses such as epoxy resins condensed from cellulose, cellulose acetate, and cellulose acetate phthalate.

The components constituting the photosensitive layer used in the present invention are, for example,
A suitable solvent such as 2-methoxyethanol, 2-methoxyethyl acetate, cyclohexane, methyl ethyl ketone, ethylene dichloride, etc. or a solvent used as a developer as described below is dissolved alone or in a suitable mixture of these solvents and applied onto a support. coated.

Furthermore, in addition to the above, the photosensitive layer contains dyes (for example, Victoria Pure Blue BO) I (manufactured by Hodogaya Chemical Co., Ltd.) and Oil Blue '8 to make the image visible after exposure or development.
03 (manufactured by Orient Kagaku Kogyo Co., Ltd.), alkyl ethers to improve coating properties (e.g., ethyl cellulose, methyl cellulose, etc.), fluorine-based surfactants, nonionic surfactants. agents (e.g., Pluronic L64 (manufactured by Layered Co., Ltd.), etc.), plasticizers for imparting flexibility to the coating film (e.g., polyethylene glycol, tricresyl phosphate,
acrylic acid or methacrylic acid polymers, etc.), stabilizers (for example, phosphoric acid, oxalic acid, tartaric acid, etc.).

The silicone rubber layer used in the present invention is an ink repellent layer, and the silicone rubber used for the core layer has a molecular weight of several thousand to several hundred thousand and has a repeating unit represented by the following general formula [I]. Preferably, the main component is a linear organic polycycloxane having a hydroxyl group in the main chain or at the end of the main chain.

General formula [■] (Si-0% where n is an integer of 2 or more, R is an alkyl group having 1 to 1 carbon atoms, a halogenated alkyl group, an alkoxyl group, a vinyl group, an aryl group, a silanol group (OH group) and R
It is preferable that 60% or more of the methyl groups are methyl groups. The silanol group (O) 1 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-5i-+OR') (2) R-5i+0^C) (3) R-5i+0N=CR'2)i where R is -
It has the same meaning as R, which is a substituent of the polymer represented by Noshiro [II, 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 include the base and
A reaction between a polymer and a silicone oil having a repeating unit represented by the following general formula [II], or a silicone base oil in which about 3% of R is a vinyl group.
It can also be obtained by an addition reaction with a polymer or a reaction between the silicone oils.

Noshiro [I1] HR (In the formula, R has the same meaning as R, which is a substituent of the polymer represented by the general formula [I1, m is an integer of 2 or more, and n is an integer of 0 or 1 or more.) This In order to obtain silicone rubber by such a crosslinking reaction, the crosslinking reaction is carried out using a catalyst. This catalyst includes tin, zinc, cobalt, lead,
Organic carboxylates of metals such as calcium, manganese, etc.
For example, dibutyltin laurate, tin (11) octoate, cobalt naphthenate, or chloroauric acid are used.

In addition, in order to improve the strength of silicone rubber and obtain silicone rubber that can withstand the 19 friction force generated during printing operations,
Fillers can also be mixed. Silicone rubber mixed with filler in advance is commercially available as silicone rubber stock or silicone rubber dispersion, and when it is preferable to obtain a silicone rubber film by coating as in the present invention, RT
V or LTV silicone rubber dispersions are preferably used. An example of this is Syl Off 23,5RX-257,5 manufactured by Toray Silicone.
There are silicone rubber dispersions for paper coating such as H237.

In the present invention, it is preferable to use condensation and crosslinking type silicone rubber.

The silicone rubber layer preferably contains a silane coupling agent having an amino group in order to further improve adhesiveness.

Examples of preferable silane coupling agents include the following.

(a) H2NCH2CH2NH(C)+2) ssi
(OCHs).

(b) )IJCEzCLNH(CH2) ssi (
OCth) 2 (CHa) (C) 82N (C)+
2) sSi (OEt)! The silicone rubber layer used in the present invention may further contain a small amount of photosensitizer.

The silicone rubber layer used in the present invention is prepared by dissolving silicone rubber in a suitable solvent, applying it onto the photosensitive layer, and drying it.

The support used in the plate material of the present invention is preferably one that is flexible enough to be set in a normal lithographic printing machine and that can withstand the load applied during printing, such as a metal plate made of aluminum, zinc, copper, steel, etc. and chromium, zinc, copper,
Metal plates, paper, plastic films, and glass plates plated or vapor-deposited with nickel, aluminum, iron, etc.
Examples include resin-coated paper and paper covered with metal foil such as aluminum.

Among these, aluminum plates are preferred.

The treatment for the support itself to improve the adhesion is not particularly limited, and includes various surface roughening treatments.

In addition, before coating the photosensitive layer on the support, a primer layer may be provided on the support in order to obtain sufficient adhesion between the photosensitive layer and the support. -vinyl acetate copolymer, acrylic resin,
Vinyl chloride resin, polyamide resin, polyvinyl butyral resin, epoxy resin, acrylate copolymer, vinyl acetate copolymer, phenoxy resin, polyurethane resin, polycarbonate resin, polyacrylonitrile butadiene, polyvinyl acetate, etc. Can be mentioned.

In addition, as the anchor agent constituting the primer layer,
For example, silane coupling agents, silicone primers, etc. can be used, and organic titanates and the like are also effective.

The thickness of each layer constituting the plate material of the present invention is as follows. That is, the support has a thickness of 50 to 400 μm, preferably 100 μm.
~300μva, photosensitive layer 0.05~10μtn
The silicone rubber layer has a thickness of 0.5 to 100 μm, preferably 1 to 40 μm.

In the present invention, a protective layer may be provided on the upper surface of the silicone rubber layer, if necessary.

The plate material of the present invention that does not require dampening water is manufactured, for example, as follows.

A composition solution to form a photosensitive layer is applied onto a support using a conventional coater such as a reverse roll coater, an air knife coater, or a Meyer bar coater, or a rotary coating device such as a Whaler, and then dried.

If necessary, a primer layer is provided between the support and the photosensitive layer in the same manner as for the photosensitive layer, and then a silicone rubber solution is applied on the photosensitive layer in the same manner.
Heat treatment is performed at a temperature of 120° C. for several minutes to fully cure and form a silicone rubber layer. If necessary, a protective film can be provided on the silicone rubber layer using a laminator.

Next, a method for manufacturing a printing plate that does not require dampening water using the plate material that does not require dampening water of the present invention will be explained.

A positive film, which is the manuscript, is vacuum-adhered to the surface of the positive plate material 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.

Next, the positive film is peeled off and developed using a developer. As the developer, any known developer for plate materials that do not require dampening water can be used. For example, aliphatic hydrocarbons (hexane, heptane, Isopar E, H, G" (manufactured by Esso Chemical Co., Ltd., product name of aliphatic hydrocarbons), gasoline, kerosene, etc.), aromatic hydrocarbons (toluene, xylene, etc.) etc),
Alternatively, it is preferable to use a halogenated hydrocarbon (triclene, etc.) to which the following polar solvent is added.

Alcohols (methanol, ethanol, water, etc.), ethers (methyl cellosolve, ethyl cellosolve, butyl cellosolve, methyl calpitol, ethyl calpitol, butyl calpitol, dioxane, etc.), ketones (
Acetone, methyl ethyl ketone, etc.), esters (ethyl acetate, methyl cellosolve acetate, cellosolve acetate, carpitol acetate, etc.) Also, dyes such as crystal violet and astrazonelet can be added to the developer to dye the image area at the same time as development. You can also do it.

Development can be carried out by a known method, such as rubbing with a developing pad containing a developer as described above, or pouring a developer onto the printing plate and then rubbing with a developing brush.

By the above development, the silicone rubber in the unexposed areas is removed and the photosensitive layer is exposed, and a printing plate is obtained in which the silicone rubber layer remains in the exposed areas.

[Examples] Next, the present invention will be explained in detail with reference to Examples, but the present invention is not limited to these Examples.

Example 1 A brimer layer having the following composition was applied to a degreased aluminum plate having a thickness of 0.24 m+o and was cured at 150° C. for 3 minutes to form a brimer layer having a thickness of 2 μm.

[Brimer layer composition Conol A epoxy resin] 50 parts Evomate 5002 (manufactured by Yuka Shell Epoxy Co., Ltd., hardening agent) 50 parts Toluene
400 parts methyl cellosolve 400 parts Photosensitive composition-1 having the following composition was coated on the brimer layer and dried at 100° C. for 3 minutes to form a 2 μm thick photosensitive layer.

[Photosensitive composition-1] (1) 120 parts of copolymer resin produced in Synthesis Example (2)
30 parts (1:4) condensate of xylene diamine and glycidyl methacrylate (3) 8 parts benzophenone (4)
Methyljetanolamine 9 parts (5) Hydroquinone 0.5 part Next, 50% of YE-3085 (trade name of silicone rubber, manufactured by Tokyo Silicone Co., Ltd.) was applied as a silicone rubber layer on the surface of the photosensitive layer.
After applying the toluene solution, the core layer was cured at 120° C. for 5 minutes to form a cured silicone rubber layer with a thickness of 2 μm.

A polyethylene terephthalate film having a thickness of 12 μm and matted on one side was laminated on the surface of the silicone rubber layer obtained as described above to obtain a lithographic printing plate material that did not require dampening water.

After a positive film was vacuum-adhered to the upper surface of the above plate material, it was exposed to light for 10 seconds using a metal highland lamp as a light source.

Next, the laminate film was peeled off from the surface of the exposure plate material and developed using the following developer. During development, by rubbing the surface of the plate material with a development bat (sponge),
Only the silicone rubber layer in the unexposed areas was easily removed. A lithographic printing plate was obtained in which the silicone rubber layer in the exposed area was firmly adhered and did not require dampening water.

[Developer composition-1] Isopar 8 70 parts Toluene 3 parts Solfit (manufactured by Clarei Sobrene Chemical Co., Ltd.) 27 parts Next, the above printing plate was dampened with Heidenberg GT with the water supply device removed.
Attached to O printing machine, manufactured by Osaka Ink Manufacturing Co., Ltd., OPI W
When printed using LP PROCESS W RED H, 20,000 prints with good small dot reproducibility and shadow part reproducibility were obtained.

Comparative Example The method of Example 1 was used, except that a 1=1 copolymer of methyl methacrylate and allyl methacrylate was used instead of the copolymer resin of the synthesis example used in Example 1 as a photosensitive layer. A lithographic printing plate material was prepared according to the method. Similarly, this plate material was exposed to light for 20 seconds and then developed to obtain a printing plate. When this was used for printing, streaks appeared over the entire plate surface as the amount of printing increased.

Furthermore, in developing the plate material, it was possible to develop the plate material in the exposed area of Example 1 by scrubbing it with a sponge, but in the comparative example, the silicone rubber in the shadow area peeled off when rubbed with force several times. It happened.

In the above examples, "parts" means "parts by weight" unless otherwise specified.

[Effects of the Invention] In the present invention, since a strong bond is formed between the photosensitive layer and the silicone rubber layer, the printing plate obtained by developing the obtained lithographic printing plate material that does not require dampening water is , an excellent effect of improving printing durability can be obtained.

Claims (1)

[Scope of Claims] A lithographic printing plate material that does not require dampening water and has a photosensitive layer and a silicone rubber layer in this order on a support, the photosensitive layer comprising (A)
A lithographic printing plate material that does not require dampening water and is characterized by containing a compound having a structural unit represented by the general formula [I] and (B) a photopolymerization initiator. General formula [I] ▲ Numerical formulas, chemical formulas, tables, etc. are available▼ [In the formula, R represents a hydrogen atom or a methyl group, and R' represents a hydrogen atom or a methyl group. Further, X represents a phenylene group, a substituted phenylene group, a phenylene group, a carboxyl group or an amide group having a hydrocarbon having 1 to 10 carbon atoms, a halogenated hydrocarbon, or a polyether group as an ester group. ]