JPS60175044A - Photosensitive composition for duplicating picture image - Google Patents

Abstract

PURPOSE:To prvent deterioration of reducing effect with the lapse of time after duplication of a picture image by incorporating a specified amine in a compsn. together with an absorbing agent of active rays, a polymeric binder having carboxylic acid groups, sulphonic acid groups, or phosphoric group in a molecule, a photopolymn. initiator, and a polymerizable monomer. CONSTITUTION:An amine compd. expressed by the formula I or II (wherein R1, R2 are 1-3C alkyl; R3 is 1-6C alkyl; R4 and R5 are 3-6C alkyl), carbon black as active rays absorber, inorg. pigment such as TiO2, org. pigment, ultraviolet ray absorber, a polymer having COOH, SO3H, or phosphoric acid group in a molecule, photopolymn. initiator such as benzophenone, and a polymerizable monomer, are contained in an org. solvent to form a soln. The soln. is coated on a base material such as paper, polyester film, Al plate, etc. and dried as a compsn. capable of forming a photosensitive layer. Thus, a photosensitive material useful as a material for duplicating picture image having superior sensitivity and resolving power for photomechanical process, etc. with sufficient reducing effect (i.e. capability of reducing halftone dots) after several days (even after two weeks) since the formation of the picture image, is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to photosensitive compositions for wave-enabled image reproduction materials. More specifically, it can be used as a lithographic film used in photolithography, etc., and when reducing the halftone dots of the duplicated image after image duplication, even if the force is reduced after the date and time after duplication, the speed of reduction is low. The present invention relates to a photosensitive composition that can be used as an image duplicating material that does not change its reducing properties.

In the photolithography process, silver mehalide photosensitive materials are currently used as lithographic film for contact return [-1], but due to the depletion of silver resources, gold-metal, non-silver salt-sensitive photosensitive materials have been used. There is a growing movement to replace it with other items. However, the essential function to substitute and obtain is the ability to completely correct the tone of the image by reducing the halftone dots of the duplicated image (reduction, dot etch).
This feature? There are very few non-silver salt photosensitive materials that have this. A known non-silver salt photosensitive material having such a force reducing property is disclosed in Japanese Patent Application Laid-Open No. 52-62427, which reduces force by utilizing the fact that the formed image has an uncured lower layer. things are listed. This certainly has excellent force reduction properties (force reduction angle and force reduction speed) immediately after image formation. However, when printing the proof plate, which is a common process in the photolithography process, this material adheres to the proof plate and is exposed to light from the back side. If this happens, the uncured lower layer will of course harden, making it 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 incorporating a polymerization inhibitor into the image area of the formed image, and filed two patent applications. This invention made it possible to create a non-silver salt lithium-ion film with a force reduction property that could be used in the actual photolithography process. It turned out that there was a point. In the actual photoengraving industry, the proof is shown to the customer and the power of the ρ copy image is reduced according to the customer's request. In some cases, it may be six months later. Therefore, it cannot be realistic unless the force reduction property remains the same over this period. However, even with the method of the invention described above, the force reducing ability itself deteriorates as the device is left unattended, and eventually it becomes impossible to reduce force. This phenomenon occurs regardless of the presence or absence of the above-mentioned backlight and the presence or absence of a polymerization inhibitor.The cause of this phenomenon is not due to a photoreaction, but in any case, it is not practical for products with such changes in strength reduction properties over time. This is a big problem that cannot be called a problem.

The present inventors have worked diligently to solve this problem and 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 the molecule, (3) the following general formula % formula % c In the formula, R1, R, have 1 to 3 carbon atoms. Alkyl group, R1 is an alkyl group with 1 to 6 carbon atoms + R4+ gl is 3 carbon atoms
~6 alkyl group] A photosensitive composition for an image duplicating material characterized by containing an amine compound (4) a photoinitiator and (5) a polymerizable monomer. .

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

(1) Actinic ray absorber An image duplicating material was prepared by adding a compound effective in absorbing actinic rays in the photosensitive wavelength range of the photosensitive composition of the present invention to the TL of the photoinitiator described below. In this case, an opaque image is formed upon imagewise actinic radiation. By absorbing actinic light, only the upper layer of the image exposed through the transparent part of the mask 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 powders of compounds such as carbon black, titanium oxide, iron oxide, various metals, metal oxides, and sulfides;
Pigment Black (C, 1, 50440), Chrome Yellow Light (C, I.

77603), 2.2r-dihydroxy-4-methoxybenzophenone #, 2.4-dihydroxybenzophenone, human tetraxyphenylbenzotriazole, 2-(2'
-Hydroxy-5'-methoxyphenyl]benzotriazole, resorcinol monobenzoate, ethyl-2
-Cyano-3,3-diphenylacrylate, Toluidine Yellow GW (C, 1,71680), Mo17 Butene Orange (C, 1,77605), Sudan Yellow (C, 1,30), Oil Orange (C, I .

12055). In particular, carbon black is desirable in order to achieve the same black color as conventional silver salts. Furthermore, if a non-colored ultraviolet absorber is used, it is better to add a dye or pigment because the image area is difficult to see. In the case of inorganic/organic pigments, metals, and metal compounds, it is necessary to micronize them by physical or chemical methods.

(2) Polymeric binder The useful polymeric binder used in the present invention is an organic monomer that is soluble in solvents and solid at temperatures below 50°C, and has a carbonyl group and a sulfonic acid group in the molecule. It is a polymer having one or more types of phosphoric acid groups across the groups. The amount of such acid groups is preferably in the range of 1 to 4 equivalents in 1 to 4 of the polymer, and by using such a polymer, the resulting image composite backing material can be developed or reduced in strength with an alkaline aqueous solution. Ru. Examples of such polymers include: a) methyl methacrylate-methacrylic acid copolymer, a polymer containing a carboxylic acid group;

Methyl methacrylate-methacrylate-strengthened butyl-acrylic copolymer, acrylic-strengthened methyl-acrylic acid copolymer, vinyl acetate-methacrylic acid copolymer.

Acrylic acid, methacrylic acid, itaconic acid, vinyl acetic acid, maleic acid such as vinylidene chloride-itaconic acid copolymer, styrene-aleic acid copolymer, styrene-maleic acid monobutyl ester copolymer, acrylonitrile-vinyl acetic acid copolymer Copolymerization of vinyl compounds containing carboxylic acid groups such as acids with other vinyl compounds, cellulose derivatives such as cellulose acetate phthalate, hydroxyglobil methyl cellulose phthalate, hydroxypropyl methyl cellulose acetate succinate, etc.

b) Polymers containing sulfonic acid groups: vinyl acetate-ethylene sulfone copolymer, methacrylic methyl-allylsulfone copolymer.

Methyl methacrylate-styrene sulfonic acid, methacrylate/
I/Wl methyl-2-sulfoethyl acrylate copolymer, methyl acrylate-2-sulfoethyl methacrylate copolymer, styrene-2-°1cryl axido-2-methylpropanesulfone branched type polymer, etc.

C) Phosphate group? Polymers containing methacrylic methyl 2-hydroxyethyl acryloyl phosphate copolymer, methacrylic methyl 2-hydroxyethyl methacryloyl phosphate copolymer, etc.

(3) Amine Compound The amine compound effective in the present invention is used to achieve the purpose of the present invention, which is to prevent changes over time in photographic performance such as alkali developability, sensitivity, and resolution of the composition, and in wave properties.
In particular, it is necessary to limit it to amine compounds represented by the following general formula.

In formula C, R1e is an alkyl group having 1 to 3 carbon atoms, R
1 represents an alkyl group having 1 to 6 carbon atoms, and R, I R1 represents an alkyl group having 3 to 6 carbon atoms. ] In the formula, RxRt is a methyl group, IR is an ethyl group or a propyl group, and R4R is a butyl group, preferably 4fF, and specifically, trimethylamine or tovethylamine.

Tri(1so-propyl)amine, tri(n-propyl)amine, dimethylethylamine, dimethyl(1so-
propyl)amine, dimethyl(n-propyl)amine,
Dimethyl(n-butyl)amine.

Examples include dimethyl(too-butyl)amine, di(18o-butylnoamine, di(n-butyl)amine), etc. These amine compounds can be used alone or in combination of several kinds.

Note that JP-A-52-62427 also describes a photopolymerization element consisting of a photoinitiator, an actinic ray absorber, a monomer, and a polymeric binder, as in the present invention, and As a cited document, 08P 3゜479, 185 describes the use of a UfJIJ tertiary amino compound as a free radical generator. However, according to research conducted by the present inventors, compounds specifically exemplified as the 37th mino compound in Id'USP 3.479.185, such as tris(4-N,N-diethylamino-0 -tolyl)methane, bis(4-N,N-diethylamino-〇-tolyl)benzylthiophenylmethane, leucomalachite green, leuco crystal violet, N-methylaniline, trihexylamine,
Ni tilpyrrolidone and the like will be demonstrated later using Examples and Comparative Examples, but apart from being a free radical generator, it can also be used as an amine compound as a component of a composition that provides wave properties that do not change over time, which is the object of the present invention. is not valid.

(4) Photoinitiator Photoinitiator is a polymerization reaction and crosslinking reaction caused by actinic light.
Something that has the ability to start R, single lI! 11t or in combination with other compounds. Examples of representative compounds include benzyl, benzophenone, Michler's ketone, 4,4'-bis(diethylamino)benzophenone,
Benzophenone derivatives such as 4-methoxy-42-dimethylaminobenzophenone, anthraquinone, 2-chloroanthraquinone, 2ethyl anthraquinone, 1-
Aromatic ketones such as chloranthraquinone and phenanthraquinone, benzoin, benzoin alkyl ethers, benzoin-containing conductors such as α-methylbenzoin, benzyl dimethyl ketal and polynuclear quinones, 2,4.5-
Examples include combination systems of triarylimidazole dimers and free radical generators. Furthermore, the sensitivity can be further improved by adding a sensitizer or a sensitizing agent. In addition, as the 2.4.5-triarylimidazole dimer, 2-2-(0-chlorophenyl)-4,5-(m-methoxyphenyl)imidazole 2i form, (0-me)xyphenyl) -4,5-diphenyl, (mf',f-l dimer, 2-(0-chlorophenyl)-4,5-diphenylimidazole 2,
Triphenylimidazole 2 such as P-methylmerocaptophenyl)-4,5-diphenylimidazole dimer
mer, 2-(1-naphthyl)-4,5-diphenylimidazole dimer, 2-(9-anthryl)-4,5-diphenylimidazole dimer, 2-(2-medoxy 1
-naphthyl)-4,5-diphenylimidazole dimer, 2-(2-methoxy-1-naphthyl)-4,5-(
0-methoxyphenylquimidazole dimer, 2-(2
-Chloro-1-naphthyl)-4,5-diphenylimidazole 21Hi [Any polycyclic aryl-4,5-diphenylimidazole dimer may be mentioned.

2.4.5-) Free radical generators used in combination with the realyl imidazole dimer include p, p'-his (p-aminophenyl ketone compounds such as dimethylaminobenzophenone, leucomalachite green, di-triphenylmethane dyes such as leuco crystal violet, cyclic diketone compounds such as 2,4-diethyl-1,3-cyclobutanedione, thioketone compounds such as 4,4-bis(dimethylamino)thiobenzophenone,
Examples include mercaptanized metals such as 2-mercaptobenzothiazole, N-phenylglycine, dimedone, and 7-diethylamino-4-methylcoumarin.

As a sensitizer or a sensitizing dye, color charts such as xanthine-based, acridine-based, thiazine-based, cyanine-based, etc. are effective.

(5) Polymer The number of monomers to be used is one, and TFC may have at least one polymerizable double bond. Examples of such compounds include alkyl acrylates or alkyl methacrylates such as hexyl acrylate, hexyl methacrylate, cyclohexyl acrylate, Schiff μ hexyl methacrylate, lauryl acrylate, lauryl methacrylate, benzyl acrylate, benzyl methacrylate, hydroxyalkyl Acrylate, human gastric xyalkyl methacrylate, NN-dialkylaminoalkyl acrylate or methacrylates, alkyl ether acrylate or methacrylate such as methoxyethyl acrylate, ethoxyethyl methacrylate, hydrogenated alkyl acrylate or methacrylate, alkyl acrylic or methacrylamide, hydroxyalkyl acrylate
e is acrylate of polyalkyl ether such as methacrylates, diethylene glycol diacrylate or methacrylate, triethylene glycol diacrylate or methacrylate; 9 is methacrylate, ethylene glycol diacrylate or dimethacrylate, glycerin, trimethyp - Acrylates or methacrylates of polyhydric alcohols such as rubronone and pentaerythritol, reaction products of acrylic acid, methacrylic acid, glycidyl acrylate or methacrylate with active hydrogen-containing substances, glycysyl compounds and acrylic acid or methacrylic acid , a condensate of an N-methylol compound and a urea compound, and a reaction product of a polyincyanate compound and a hydroxyalkyl acrylate or methacrylate.The monomers used are not limited to one type, and the binder It is necessary to select the monomer to be used depending on the type and amount of the photoinitiator, the type and amount of the photoinitiator, the type and amount of the active light absorbing compound, etc. , photosensitivity, etc. If the boiling point of the li form used is low, it will be exhibited during or after film formation and will decrease in 2, so a higher boiling point is desirable.

Next, to describe the desirable blending ratio of each of the above-mentioned compositions constituting the composition of the present invention, since the active leading edge absorbent may be an inorganic pigment and covers a very wide range, If the absorbance is within the active light range of 1 μm or more for the active composition, a range of 0.4 to 4 is preferable. 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, it is undesirable to sacrifice the rate of force reduction considerably. If it is 4 or more, the exposure amount for image formation is not large and the time required for image duplication is long, which is not practical.

Regarding components other than the actinic ray absorber, the preferred blending ratios of the monomer and photoinitiator (system) are 60 to 120 parts by weight and 0.5 to 120 parts by weight, respectively, per 100 parts by weight of the polymeric binder.
It is 40 parts by weight. If each is lower than the lower limit,
This is unfavorable in terms of photosensitivity and developability, and if the monomer content exceeds 120 parts by weight, the range of developability is small, and
The quality of the resulting resist image is also poor. When the photoinitiator (system) is blended in an amount greater than 40 parts, the thermal stability (
(Shelf life) The upper rod becomes an unusual composition.

The amine compound has an equivalent weight of 0 to 1 of the polymeric binder.
．． Preferably, the amount is 1 to 2 equivalents. Below 0.1 equivalent,
It is hardly effective in preventing changes in strength reducing properties over time; on the other hand, if the amount is more than 2 equivalents, although it is effective, the image duplicating material will give off an amine odor, lowering its commercial value.

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 used in the photolithography process, the following structure is used. preferable. That is, on a support having or having a subbing layer, the photosensitive composition (produced herein) is coated in a thin film with a dry thickness of 15/I or less, by solution coating, or by hot bath melt extrusion. 1) Furthermore, a protective film t'' is usually provided on top of the photosensitive resin, but it is preferable to form a protective layer soluble in an aqueous solvent.Furthermore, in order to improve the scratch resistance of the reproduced image, A scratch-resistant layer, which the present inventors previously applied for a patent, may be provided between the protective film or the protective layer.

Suitable supports for use in the image reproduction material in the present invention include glass plates, plastic films, gold plated plates, and papers. 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 polyester film is preferred because it has excellent dimensional stability and stability. Although there is no strict limit to the thickness of the support, 75 to 125 tones is suitable.

In the present invention, the effect is observed even when the support is in direct contact with the photosensitive resin layer, especially when the support is impregnated with an adhesive compound that can improve the adhesive strength to the photosensitive resin layer. However, a generally preferred configuration is one that has a subbing layer 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 φ acrylonitrile/itaconic acid copolymer, vinyl chloride/vinyl acetate/maleic anhydride copolymer, terephthalic acid/isophthalic acid φ glycol copolymer, and Mention may be made of thin films of polymeric substances such as incyanate compounds. Layer thickness is usually 0.2~
It is 2μ.

The metal or metal compound of the metal or metal compound layer that is preferable as the subbing layer includes aluminum, boronium, iron, magnesium, silicon, titanium, cobalt, copper, indium, iridium, molybdenum, etc. , nickel, palladium, platinum, rhodium, selenium, silver, tantalum, tin, tungsten, vanadium, zinc, zilium, etc., and alloys, ferments, nitrides, borides, carbides, sulfides, and salts of the above metals. For example, aluminum oxide, magnesium fluoride, titanium oxide, silicon chloride, aluminum-zinc alloys, etc. These metals are among the metal compounds.
Aluminum is most preferred because its alloys or compounds are inexpensive and have a high etching rate in aqueous solvents. Methods for providing the thin layer of metal or metal compound on the 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 1000 A, preferably 30 A.
It is 0-600A.

In the present invention, the photosensitive resin layer has good light transmittance and is removable in order to maintain the surface or to prevent inhibition of the photopolymerization reaction by oxygen, especially when the photosensitive resin layer is a photopolymerization type. The protective film may be coated with a protective layer soluble in an aqueous solvent. 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 5 # is preferred. If it is too thin and has a thickness of 0.1 μm or less, its function as a surface protective layer will be weakened, and if it is 5 μm or more, 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 28th edition.

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 to receive exposure from the original side. The light source that can be used in this case is a high-pressure mercury lamp.

It is possible to use those commonly used in photolithography processes, such as ultra-high pressure mercury lamps and carbon arc lamps. In a special case, when a spectral sensitizer such as a dye is used as a photoinitiator (system), the image pattern can be printed directly by laser scanning such as Ar laser + He-Cd laser without using the above original film. It is also possible to include

After exposure, the image duplicating material is immersed in an aqueous developer such as an alkaline aqueous solution, and the surface is then rubbed with a brush or sponge to remove the non-exposed areas and reveal an image pattern. Usually, after this, it is immersed in an aqueous solution containing a polymerization inhibitor such as /% idoquiquinone or resorcinol, and then the entire tying operation is carried out, followed by a light washing with water, and then the outer turning side of the needle is salted and attached. The process is to spray L, fcj with the same solvent as the reducing solution or developer, or a diluted version of these solvents.
) It is done by rubbing a sponge or brush in a solvent, or by rubbing a brush soaked in a solvent.

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

1. When correcting the tone by reducing the power of the duplicate image,
Regardless of the number of days from image formation to force reduction, the same force reduction performance can be maintained.

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

3. Evaluate the suitability of 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. Improved accuracy in copying harmful images, developability and fixing properties.As a result, the process time required for copying is shortened, and the working time in the photolithography process is shortened.

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 5, Comparative Examples 1 to 24 A polyester film having a subbing layer of O,5pi was prepared by coating a 100μ thick polyester film with the following composition at 11% using a reverse coater.

Next, photosensitive compositions f and l were prepared by mixing and dispersing the following compositions.
11, coated with a reverse coater on a polyester film provided with the following undercoat layer,
A photosensitive layer with a thickness of 3.11 was coated.

Furthermore, a 21-stage step guide (manufactured by Dainippon Screen Co., Ltd.) and a flat-tone image with a dot area ratio of 40% at 150 #/in were combined with this film y and the obtained image duplication material having the following composition. 3I (
Image exposure was performed for 15 seconds using a W bright room printer (manufactured by CORC). Next, after removing the protective layer by washing with water, immerse the sample in a 0 or 75% Na2Col aqueous solution adjusted to 30°C for the required time (blank time), wash with water, develop while rubbing with a sponge, and dry. Obtain an inverted image by
Ta.

It was found that up to the 5th stage of the step guide was cured and the halftone dots reproduced the negative well.

Next, a duplicate halftone image made in the same manner was immersed in a 5% hydroquinone water bath solution 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/- 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 of aging (
2) The other sheet was stored indoors in the dark at 20°C and 65%.After 114 days, the force reduction operation was performed L5 and changes over time were observed.

(2) As a reducing liquid, a warm aqueous solution of potassium phosphorus and sodium ammonium hydrogen phosphate (1:1 by weight)
Each sample was soaked in this solution for 30 seconds and then drained. On a washing light table, rub it with a sponge, wash it with water, dry it, and calculate the % loss of force of the sample obtained in ft0.
(Dot area ratio before power reduction (%) and halftone dot area ratio after power reduction (%)
). ) is measured using a dot area meter (DT-10 manufactured by Dainippon Screen). The obtained results are shown below.
Shown below.

Table 1 As is clear from Table 1, the reduction in area of the image duplicating material containing the amine compound specified in the present invention did not change at all even after 14 days, but that of the image duplicating material containing -1 other amine compounds decreased by about half. It can be seen that the value has decreased.

Examples 6 to 19 These examples demonstrate how effective the combination of the polymeric binder and the amine compound described in the claims of the present invention is in achieving the effects of the present invention. be. 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 reverse coater,
A protective layer was further coated to a thickness of 3 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 the amine compound of the present invention is used, carboxylic acid groups,
Sulfonic acid group or phosphate group glue patent applicant Toyobo Co., Ltd.

Claims (1)

[Scope of Claims] At least (1) an actinic ray absorber; (2) a polymeric binder having one or more of carboxylic acid groups, sulfonic acid groups, or phosphorous groups in the molecule; (3) the following general Formula (in the formula 'R
1, R2 is an alkyl group having 1 to 3 carbon atoms, R3 is an alkyl group having 1 carbon number
~6 alkyl group + Ra + Rs is an alkyl group having 3 to G carbon atoms i8) An amine compound comprising (4) a photoinitiator and (5) a polymerizable monomer. Photosensitive composition for image reproduction material