JPS61176921A - Sensitive composition for image reproducing material - Google Patents

Abstract

PURPOSE:To obtain an excellent reduction treatment and to maintain a reduction property of the titled composition to constant in spite of a lapse of period from the image formation to the reduction by incorporating an active ray absorbent, a light initiator, a polymeriable monomer and a polymer binder contg. a specific group to the titled composition. CONSTITUTION:The titled composition contains the active ray absorbent, the light initiator, the polymerizable monomer and the polymer binder contg. one or more kinds of a carboxylic acid, a sulfonic acid or a phosphoric acid. Said acid group contained in the polymer binder forms a salt with 0.01-0.5 equivalent of an alkaline and/or an alkaline earth metal per one equivalent of said acid. The partial salt formation in the acid group contained in the polymer binder acts to stabilize the reduction of the image reproducing material, and is liable to a permeation of an alkaline solution of the reducer, and also, improves the reducing treatment due to a sponge and a writing brush. The reduction property of the titled composition is maintained to the constant, notwithstanding the lapse of the periods from the image formation to the reduction, and a rapid reducing treatment becomes possible. The titled composition has a fitness for various kinds of rewriting materials and a light sensitivity suitable to the image reproducing material and has not effect upon the shelf life and does not lower the resolution.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to photosensitive compositions for reducible image reproduction materials. More specifically, it can be used as a lithographic film used in photoengraving applications, etc., and when reducing the power by reducing the halftone dots of the image reproduction, the reduction speed etc. The present invention relates to a photosensitive composition that can be used as an image duplicating material that does not change its reducing properties.

[Conventional technology]

In the photolithography process, silver halide photosensitive materials are currently used as lithographic film for contact return, but due to the depletion of chain resources, there is a need to replace this with non-silver halide photosensitive materials. There is a lot of movement. however,
The essential function for this to be used as a substitute is the ability to modify the tone of the image by reducing the size of the halftone dots in the reproduced image (attenuation, dot etch), but there are only a few non-silver salt photosensitive materials that have this function. As a known non-silver salt photosensitive material having such a force-reducing property, JP-A-52-
Japanese Patent No. 82427 describes a device that reduces force by utilizing the fact that the formed image has an uncured lower layer portion.

[Problem that the invention seeks to solve]

The material certainly has excellent stress reduction properties (% reduction and rate of reduction) immediately after image formation.

However, during proof printing, which is a common process in the photolithography process, when the proof plate is brought into close contact with the proof plate and exposed to light from the back side, the unhardened lower layer naturally hardens.
After that, it becomes impossible to reduce the force at the time when it is actually required. In order to improve this drawback, the present inventors invented a method of containing a polymerization inhibitor in the image area of the formed image, and previously filed a patent application. Through this invention, a non-silver salt lithium-ion film was realized that had a force reducing property that could be used in the actual photolithography process. It turns out that there is. In the actual photoengraving industry, the proof is shown to the orderer and the reproduced image is reduced in force at the customer's request.
Sometimes it's the same day that the proof is printed, sometimes it's later than six months later. Therefore, unless the force reduction property remains the same over this period, it cannot be of practical use. However, even with the method of the above invention, the force reduction itself is
As it is left unattended, it decreases and eventually becomes impossible to reduce. This phenomenon occurs regardless of the actual exposure time or the presence or absence of the polymerization inhibitor as described above, so the cause is not due to a photoreaction, but in any case, there is a change in strength reduction over time. This is a big problem and cannot be called practical.

[Means for solving problems]

The present inventors have made extensive efforts to solve this problem and to develop a photosensitive material for image duplicating materials that can truly reduce force, and as a result, they have gradually completed the present invention. That is, the present invention provides at least (1) an actinic ray absorber, (2) a polymeric binder having one or more carboxylic acid groups, sulfonic acid groups, or phosphoric acid groups in its molecule, (3) a photoinitiator, and (2) Contains a polymerizable monomer, and the amount of one or more carboxylic acid groups, sulfonic acid groups, or phosphoric acid groups in the polymeric binder is 0.01 to 0.5 equivalent per equivalent. A photosensitive composition for image duplicating materials, characterized in that it forms a salt with an alkali metal or/and an alkaline earth metal.

Each composition of the photosensitive composition of the present invention will be explained in detail below.

(1) Actinic ray absorber In addition to the photoinitiator described below, an image duplicating material can be prepared by adding a compound effective in absorbing rays in the wavelength range to which the photosensitive composition of the present invention is sensitive, that is, rays of actinic rays. In this case, an image that is opaque to imagewise actinic radiation is formed. By increasing the absorption of actinic rays, in the image portion exposed through the transparent portion of the mask, only the upper layer undergoes a curing reaction, while the lower layer remains uncured. In this manner, by retaining the uncured lower layer portion, the force reducing property, which is an advantageous characteristic for use as a plate-making film, is maintained.

Actinic light absorbers used include ultraviolet absorbers, ultraviolet absorbing dyes, and other dyes and pigments. Examples of these include carbon black, titanium oxide, iron oxide,
Powders of various metals and compounds such as metal oxides and sulfides, pigment black (C, I, 5044G), chrome yellow light (C, I, etc.).

77803), 2,2'-dihydroxy-4-methoxybenzophenone, 2,4-dihydroxybenzophenone, hydroxyphenylbenzotriazole, 2-(2
'-Hydroxy-5'-methoxyphenyl)benzotriazole, resorcinol monobenzoate, ethyl-
2-cyano-3,3-diphenylacrylate, toluidine yellow-GW(C,1,)1(i8G), molybdenum orange (C,1,77805), Sudan yellow (C,I,30), oil orange ( C, I
, 12055). In particular, carbon black is desirable in order to achieve the same black color as conventional silver salts. Furthermore, when using a non-colored ultraviolet absorber, it is better to add dyes or pigments because the image area is difficult to see. In the case of inorganic/organic pigments, metals, and metal compounds, it is necessary to make them into fine particles by physical or chemical methods.

■ Polymeric binder The polymeric binder useful in the present invention is an organic polymer that is soluble in a solvent and solid at temperatures below 50°C, and that has a carboxylic acid group, a sulfonic acid group, or It is a polymer containing 1M or more of phosphoric acid groups. Such acid groups are preferably in the range of 1 to 4 equivalents per kg of polymer, and by using such a polymer, the resulting image reproduction material can be developed or reduced in an alkaline aqueous solution. Examples of such polymers include a)
Polymers containing carboxylic acid groups Methyl methacrylate-methacrylic acid copolymer, methyl methacrylate-butyl methacrylate-acrylic acid copolymer, methyl acrylate-acrylic acid copolymer, vinyl acetate-methacrylic acid copolymer, Vinyl chloride-itaconic acid copolymer, styrene-maleic acid copolymer, styrene-
Copolymerization of vinyl compounds containing carboxylic acids such as acrylic acid, methacrylic acid, itaconic acid, vinyl acetic acid, maleic acid, etc., such as maleic acid monobutyl ester copolymer, acrylonitrile-vinyl acetic acid copolymer, and other vinyl compounds, and cellulose. Cellulose derivatives such as acetate phthalate, hydroxypropyl methylcellulose phthalate, hydroxypropyl methylcellulose acetate succinate, etc.

b) Polymers containing sulfonic acid groups Vinyl acetate-ethylene sulfonic acid copolymer, methyl methacrylate-allylsulfonic acid copolymer, methyl methacrylate-styrene sulfonic acid, methyl methacrylate-2-
Sulfoethyl acrylate copolymer, methyl acrylate-2-sulfoethyl methacrylate copolymer, styrene-2-acrylamide-2-methylpropanesulfone copolymer, and the like.

C) Polymer containing phosphoric acid group Examples include methyl methacrylate-2-hydroxyethyl acryloyl phosphate copolymer and methyl methacrylate-2-hydroxyethyl methacryloyl phosphate copolymer.

(2) Photoinitiator A photoinitiator has the ability to initiate a polymerization reaction or a crosslinking reaction using actinic rays, and is used alone or in combination with other compounds. Examples of representative compounds include benzyl, benzophenone, Michler's ketone, 4.4'
-benzophenone derivatives such as bis(diethylamino)benzophenone and 4-methoxy-4'-dimethylaminobenzophenone; aromatic compounds such as anthraquinone, 2-chloroanthraquinone, 2ethylanthraquinone, 1-chloroanthraquinone, and phenanthraquinone; Ketones, benzoin, benzoin alkyl ethers, benzoin derivatives such as α-methylbenzoin, benzyl dimethyl ketal, polynuclear quinones, combination systems of 2,4.5-) realarylimidazole and free radical generators, etc. be.

Furthermore, the sensitivity can be further improved by adding a sensitizer or a sensitizing dye.

The 2,4,5-)lyarylimidazole dimer is 2-2-(0-chlorophenyl)-4.5-(m-methoxyphenyl)imidazole 2
(0-methoxyphenyl)-4, 5-diphenylimidazole dimer, 2-(0-chlorophenyl)-4
．． 5-diphenylimidazole dimer, triphenylimidazole dimer such as 2-(P-methylmercaptophenyl)-4,5-diphenylimidazole dimer, 2
-(1-naphthyl)-4.5-diphenylimidazole dimer, 2-(9-anthryl)-4,5-diphenylimidazole dimer, 2-(2-methoxy-1-naphthyl)-4.5- Diphenylimidazole dimer, 2-
(2-methoxy-1-naphthyl)-4.5-(0-methoxyphenyl)imidazole dimer, 2-(2-chloro-1-naphthyl)-4.5-diphenylimidazole 2
Examples include polycyclic aryl-4,5-diphenylimidazole dimers such as ftt body.

Free radical generators used in combination with 2,4,5-triarylimidazole dimer include ppt
p-aminophenyl ketone compounds such as nibis(dimethylamino)benzophenone, leucotriphenylmethane dyes such as leucomalachite green and leuco crystal violet, cyclic diketone compounds such as 2,4-diethyl-1,3-cyclobutanedione, 4. Thioketone compounds such as 4-bis(dimethylamino)thiobenzophenone, mercaptan compounds such as 2-mercaptobenzothiazole, N-phenylglycine, dimedone, 7
-diethylamino-4-methylcoumarin and the like.

As a sensitizer or a sensitizing dye, xanthine-based, acridine-based, thiazine-based, cyanine-based dyes and the like are effective.

(ψ monomer The monomer used may be any monomer having one or more polymerizable double bonds. Examples of such compounds are hexyl acrylate, hexyl methacrylate, cyclohexyl acrylate. , alkyl acrylate or alkyl methacrylates such as cyclohexyl methacrylate, lauryl acrylate, lauryl methacrylate, benzyl acrylate, benzyl methacrylate, hydroxyalkyl acrylate,
hydroxyalkyl methacrylate), NN-dialkylaminoalkyl acrylate or methacrylates, alkyl ether acrylate or methacrylates such as methoxyethyl acrylate, ethoxyethyl methacrylate, halogenated alkyl acrylate or methacrylate, alkyl acrylic or methacrylamide acrylates or methacrylates of polyalkyl ethers such as hydroxyalkyl acrylates or methacrylates, diethylene glycol diacrylate or methacrylate, triethylene glycol diacrylate or methacrylate, ethylene glycol diacrylate or dimethacrylate, glycerin, trimethylol Acrylates or methacrylates of polyhydric alcohols such as propane and pentaerythritol, reaction products of acrylic acid, methacrylic acid, glycidyl acrylate or methacrylate with active hydrogen groups, and reaction products of glycysyl compounds with acrylic acid or methacrylic acid. Examples include reactants, condensates of N-methylol compounds and urea compounds, and reactants of polyisocyanate compounds and hydroxyalkyl acrylates or methacrylates. The monomer to be used is not limited to one type, but may vary depending on the type of binder, monomer ratio, type and amount of photoinitiator, type and amount of actinic light absorbing compound, etc. The choice must be made based on compatibility, film-forming properties, stability, photosensitivity, etc. If the monomer used has a low boiling point, it will volatilize and decrease during or after film formation, so a higher boiling point is desirable.

■ Any metal that can form a salt with the acid group of the alkali metal or alkaline earth metal polymeric binder may be used, such as lithium, sodium, potassium, magnesium,
Examples include calcium, strontium, and barium. These can be blended in the form of hydroxides, chlorides, nitrates, etc. to form acid salts of the polymeric binder.

Next, to describe the desirable blending ratio of each of the above-mentioned compositions constituting the composition of the present invention, since the actinic ray absorber may be an inorganic pigment and covers a very wide range, the photosensitive As long as the absorbance of the composition is within the range of actinic rays per 1μ, the range is preferably 0.4 to 4. If it is less than 0.4, considerable photocuring will proceed even in the uncured lower layer, and although it cannot be said that it is impossible to reduce the force, the rate of force reduction will be considerably sacrificed, which is not preferable. On the other hand, if it is 4 or more, the time required for mRMI production, which does not require a large exposure amount for image formation, becomes long and cannot be said to be practical.

Regarding components other than the actinic ray absorber, the preferred blending ratios of the monomer and photoinitiator (system) are 80 to 120 parts by weight and 0.5 to 0.5 parts by weight, respectively, based on 100 parts by weight of the polymeric binder.
It is 40 parts by weight. If each is lower than the lower limit,
It is unfavorable in terms of photosensitivity and developability, and if the monomer content is more than 120 parts by weight, the range of developability is small, and
The quality of the resulting resist image is also poor. If more than 40 parts by weight of photoinitiator (system) is incorporated, thermal stability (
This results in a composition that is unfavorable in terms of shelf life (shelf life).

The alkali metal or alkaline earth metal is used in an amount of 0.01 to 0.5 equivalent, especially 0.01 to 0.5 equivalent per 1 acid equivalent of the polymeric binder.
．． Preferably, the amount is 0.05 to 0.3 equivalent. If the amount is less than 0.01 equivalent, it will have little effect on preventing changes in reducing strength over time, and if it is more than 0.5 equivalent, it will be effective, but it will affect the alkali developability, sensitivity, resolution, etc. of the image duplicating material. Decreases performance. A method for forming a salt of an alkali metal or alkaline earth metal and a polymeric binder is to mix an alkali metal or alkaline earth metal hydroxide, chloride, nitrate, etc. with a polymeric binder in a solution. Just that is fine. These metals and polymeric binders may be salted in advance and then mixed with other components, or these metal compounds may be mixed with the polymeric binder together with other components. .

In the case of alkaline earth metals, salts can also be formed from the outside by immersing them in an alkaline earth metal hydroxide solution, for example, after image duplication.

The photosensitive composition of the present invention may also contain plasticizers, thermal polymerization inhibitors, surfactants, solvents, scratch resistance improvers, etc. that are generally used in photosensitive compositions in addition to the above-mentioned main components. Good things are natural.

When the photosensitive composition of the present invention is used to produce an image duplicating material that can be reduced in force, that is, a non-silver salt lithium film that can be used in a photolithography process, it is preferable to have the following configuration. . That is, the photosensitive composition of the present invention is applied to a dry explosion thickness of 1 on a support with or without a subbing layer.
A photosensitive resin layer (which can be formed into a thin film of 5 μm or less by solution coating or hot melt extrusion) is usually further provided with a protective film or a protective layer soluble in an aqueous solvent is formed thereon. Furthermore, in order to improve the scratch resistance of the reproduced image, a photosensitive resin layer and a protective film or a protective film such as rrJI
A scratch-resistant layer, for which the present inventors have previously applied for a patent, may be provided between the layers.

Suitable supports for use in the image reproduction material in the present invention include glass plates, plastic films, metal plates, papers and the like. Examples of plastic films include films of polyester, polypropylene, polyethylene, polyvinyl chloride, polyvinylidene chloride, polycarbonate, cellulose acetate, and the like. In particular, a biaxially stretched sheet polyester film is preferred since it has excellent dimensional stability and transparency. Although there is no strict limit to the thickness of the support, a thickness of 75 to 125 μm is appropriate.

In the present invention, the effect is observed even when the support is in direct contact with the photosensitive resin layer, and in particular, the support is impregnated with a youthful compound that can improve the adhesive strength to the photosensitive resin layer. Although this may be true in some cases, a generally preferred configuration is one in which there is an undercoat between the support and the photosensitive resin layer. The subbing layer can be a thin layer of polymeric material or a thin layer of metal or metal compound.

Preferred polymer compound thin layers include, for example, polyacrylate, polyvinylidene chloride/acrylonitrile/itaconic acid copolymer, vinyl chloride/vinyl acetate/maleic anhydride copolymer, terephthalic acid/isophthalic acid/glycol copolymer, etc. Mention may be made of thin films of polymeric substances such as incyanate compounds. The thickness of the moon is usually 0.2~
It is 2μ.

Further, metals or metal compounds of the metal or metal compound layer that are preferable as the subbing layer include aluminum, boronium, iron, magnesium, silicon, titanium, cobalt, copper, indium, iridium, lead, manganese, molybdenum, nickel, palladium, Examples include platinum, rhodium, selenium, silver, tantalum, tin, tungsten, vanadium, zinc, zirconium, etc., and alloys, oxides, nitrides, borides, carbides, sulfides, and salts of the above metals. Examples include aluminum, magnesium fluoride, titanium oxide, silicon oxide, and aluminum-zinc alloys. Among these metals or metal compounds, aluminum or its alloys or compounds are most preferred in terms of cost and high etching rate in aqueous solvents. Methods for providing a thin layer of metal or metal compound on a support include plating, vacuum deposition, sputtering, ionized electrostatic plating, and the like. The thickness of the metal or metal compound varies depending on the type of metal or metal compound, but is usually 100 to 100 OA, preferably 300 to 100 OA.
It is 600A.

In the present invention, the photosensitive resin layer has good light transmittance and is removable, in order to protect the surface or, especially when the photosensitive resin layer is a photopolymerization type, to prevent inhibition of the photopolymerization reaction by oxygen. Protective film or soluble in water-based solvents! It may be coated with an I layer. Therefore, resins such as polyvinyl alcohol, polyacrylic acid, and methyl cellulose that are soluble in aqueous solvents can be used. In particular, polyvinyl alcohol is preferred because it has excellent oxygen barrier properties and can reduce the radical polymerization damage prevention effect caused by oxygen. The thickness of these protective films or protective layers is 0
．． 1 to 5μ is preferable. If it is too thin, less than 0.1 μm, its function as a surface protective layer will be somewhat weakened, and if it is more than 5 μm, the resolution of the image will decrease, which is not preferable.

The image duplicating material obtained as described above using the photosensitive composition of the present invention can be used not only as a film for printing plates (so-called lithographic film for turning), but also as a photosensitive film for photomasks, color proofing, and lithographic printing. It can be used for various purposes such as PS version.

Further, a process for obtaining a reproduced image using an image duplicating material containing the composition of the present invention and further reducing force will be described below.

The image reproduction material is first brought into close contact with the original negative or positive film and exposed to light from the original side. As light sources that can be used at this time, those commonly used in photolithography processes, such as high-pressure mercury lamps and carbon arc lamps, can be used.

In a special case, when a spectral sensitizer such as a dye is used as a photoinitiator (system), the image pattern can be directly created by laser scanning such as Ar laser or He-Cd laser without using the above original film. Burning is also possible.

After exposure, the image duplicating material is immersed in an aqueous developer such as an aqueous alkali solution, and then the surface is removed with a brush or sponge to remove the non-exposed areas and an image pattern appears. Usually, after this, it is immersed in an aqueous solution containing a polymerization inhibitor such as hydroquinone or resorcinol, followed by a fixing operation, followed by light washing with water and drying in this order to obtain a duplicate image. The reduction is done by spraying with the same solvent as the reducing solution or developer, or by diluting them, by rubbing with a sponge or brush in the solvent, or by rubbing with a brush soaked in the solvent. .

[For production]

It is obvious that forming a salt of the acid groups of the polymeric binder of the present invention with alkali metals and/or alkaline earth metals is effective in stabilizing the reducing force of the image reproduction material. However, it is presumed that the formation of a salt blocks the adverse effects of acid groups contained in the polymeric binder, which is a component of the photosensitive resin composition. That is, for example, acid groups such as carboxylic acid groups, sulfonic acid groups, and phosphoric acid groups in the polymeric binder are thought to form complexes with each other or with electron-donating groups such as ether groups through hydrogen bonds. Therefore, it is thought that this kind of interaction is related to the time-dependent change in depotency, and that alkali metals or alkaline earth metals block such interactions.

Furthermore, the photosensitive composition for image duplicating materials of the present invention not only has stability in reducing force but also allows easy penetration of an alkaline aqueous solution as a reducing liquid during reducing force. It was also found that it has excellent force operability.

〔Effect of the invention〕

Since the present invention has the above-described configuration, an image duplication material formed using the same has the following features.

1. When correcting the tone by reducing the force of a reproduced image, the same force reduction performance can be maintained regardless of the number of days elapsed from the image formation until the force reduction.

-2 The speed of depowering itself is improved, and the depowering work can be carried out quickly.

In addition, since the reducing liquid penetrates well, it is easy to operate the reducing force using a sponge or brush.

3. It is suitable for various correction materials such as opaque and staging varnish used in the photolithography process.

4. Does not adversely affect the photosensitivity, shelf life, etc. of image duplication materials.

5. The resolution of the image duplication material is not reduced.

6. In image duplication, since the developability and fixability are improved, the process time required for duplication is shortened, and the working time in the photolithography process is shortened.

〔Example〕

EXAMPLES The present invention will be specifically described below in Examples, but the present invention is not limited thereto.

In the examples, parts simply mean parts by weight.

Examples 1 to 6, Comparative Example 1 A polyester film having a thickness of 100 μm was coated with the following composition using a reverse coater and dried to produce a polyester film having a subbing layer of 0.5 μm.

Methyl ethyl ketone
20 parts Next, a photosensitive composition was prepared by mixing and dispersing the following compositions, and each of the photosensitive compositions was coated using a reverse coater on a polyester film provided with the following undercoat layer to form a 3 μm thick photosensitive layer.

trimethylolpropane triacrylate
31 parts 2-mercaptobenzothiazole
1 part carbon black
18 parts methanol
280 parts ethyl acetate
80 parts chloroform
40 parts of the metal compound shown in Table 1 Further, a protective layer composition having the following composition was similarly coated on this film to prepare an image duplicating material having a protective rgI layer with a thickness of 1 μm.

polyvinyl alcohol
5 parts (saponification 88.b%, 0.2 parts methanol)
5 parts water
A 21-stage step guide (manufactured by Dainippon Screen Co., Ltd.) and a 150-t
/ in Next, after removing the WI retaining layer by washing with water, wash at 30°C depending on the sample.
After immersing the film in a 0.75% Na*COs aqueous solution adjusted to 0.75% Na*COs for a predetermined time (white-out time), washing with water, developing while rubbing with a sponge, and drying, a reversal image was obtained.

As a result, it was found that up to the 5th stage of the step guide was cured, and that the halftone dots reproduced the negative well.

Next, a duplicate halftone image made in the same manner was immersed in a 5% aqueous solution of hydroquinone kept at 30°C for 15 seconds, and then washed with water.
Dry treated.

The sample thus obtained was subjected to a force reduction test as described below.

(1) First, assuming printing of a calibration plate, expose the sample to 80 mJ/cJ from the back side using a bright room printer.

Prepare two similarly treated samples of the same type. Immediately use one of the samples as a sample after 0 days as shown below.
The other sheet was stored in a dark room at 20° C. and 65 tA, and after 14 days, the force was reduced and changes over time were observed.

(2) A mixed aqueous solution of potassium phosphate and sodium ammonium hydrogen phosphate (weight ratio: 1=1) was prepared as a reducing solution, and each sample was immersed in this solution for 30 seconds and then drained.

It was rubbed with a sponge on a washing light table, washed with water, and dried.

The % reduction (indicated by the difference between the halftone area ratio (%) before reduction and the halftone area ratio (%) after reduction) of the obtained sample was measured using a dot area meter (DT made by Dainippon Screen). -10) The results obtained are shown in Table 1 below.

Table 1 1) Degree of Neutralization Equivalent of metal per equivalent of acid group of polymeric binder in the photosensitive layer As is clear from Table 1, in the present invention, a polymeric binder and a salt of an alkali metal or alkaline earth metal are used. It can be seen that the % loss of force of the formed image duplicating material remains almost unchanged even after 14 days, but that of the material not containing these materials is reduced to about half.

Examples 7 to 14 A photosensitive composition was prepared by mixing and dispersing the following composition on a polyester film having an adhesive layer obtained in the same manner as in Example 1, and coated with a linok coater to a thickness of 3 μm. A photosensitive layer was coated.

Polymeric binder shown in Table 2 41
．． Part 5 Jimedon
3 parts 7-diethylamino-4-methylcoumarin
1.5 parts hydroquinone monomethyl ether
0.05 parts trimethylolpropane triacrylate 34 parts carbon black
12 parts methanol
280 parts Ethyl acetate 80 parts Chloroform 4
0 parts Sodium hydroxide Degree of neutralization 0.1 A protective layer was further coated in the same manner as in Example 1, and the resulting image duplicating material was tested for force reduction properties. However, the exposure amount was adjusted so that the step guide was cured in 5 steps. The obtained results are summarized in Table 2.

Table 2 As is clear from Table 2, as long as it partially forms a salt with the metal compound of the present invention, any of carboxylic acid groups, sulfonic acid groups, and phosphoric acid groups in the molecule can be used as a polymeric binder. It can be seen that the % loss of force of the resulting image reproduction material is maintained even with

Claims (1)

[Claims] At least (1) an actinic ray absorber, (2) a polymeric binder having one or more carboxylic acid groups, sulfonic acid groups, or phosphoric acid groups in the molecule, (3) a photoinitiator, and (4)
Contains a polymerizable monomer, and the amount of one or more carboxylic acid groups, sulfonic acid groups, or phosphoric acid groups in the polymeric binder (2) is 0.01 to 0.5 equivalent per equivalent. 1. A photosensitive composition for image duplicating materials, characterized in that it forms a salt with an alkali metal or/and an alkaline earth metal.