JPH10198050A - Transfer image forming material and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transfer image forming material improved in the dot reproducibility of the transfer image forming material which forms transfer images by subjecting a base to exposure (rear exposure) from the side opposite to the side having a photosensitive layer and a process for producing the same. SOLUTION: This transfer image forming material is formed by providing the transparent base with the photosensitive layer and is used for execution of image formation by subjecting the transfer image forming material to the image exposure from the transparent base side and transferring the image formed on the transparent base to a medium to be transferred. The respective refractive indices of the plural layers, for example, anchor layer, cushion layer and release layer, disposed between the transparent base and the photosensitive layer are respectively smaller than the refractive index of the transparent base and the absolute value of the difference between these refractive indices is below 0.07. The cushion layer is formed of a coating liquid of <1.5 in the absolute value of the difference in the dissolution parameter values between the cushion material of the transfer image forming material and a coating solvent.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a transfer image forming material (color proof, printing plate, etc.) for exposing a support from the side opposite to a photosensitive layer to form a transfer image, and a method for producing the same. The present invention relates to a transfer image forming material having improved dot reproducibility of an image forming material and a method for producing the same.

[0002]

2. Description of the Related Art The image forming process of a printing plate or a color proof for color proofing in multicolor printing includes the following methods.

Exposure → liquid development (exposed area elutes [positive], unexposed area elutes [negative]) → creates color proof by transferring to paper etc. Exposure (reduces the adhesiveness of exposed areas) → transfers to paper etc. Create a color proof by exposing (transferring the adhesive in the unexposed area) Exposure (reducing the adhesiveness in the exposed area) → Transfer to a printing plate such as an aluminum plate (transferring with the adhesive in the unexposed area) to create a printing plate In the present invention, the exposure is performed from the side opposite to the side having the photosensitive layer with respect to the transparent support (hereinafter referred to as back exposure).

[0004] Regarding the above technology, for example, Japanese Patent Laid-Open Publication No. 1-1
No. 69449, No. 1-169450 and the like, a back image is exposed with a transfer image forming material provided with a release cushion layer and a photosensitive layer formed on a transparent support, liquid development is performed, and an exposed portion or unexposed portion is exposed. A technique has been disclosed in which a portion is eluted and an image formed on a cushion layer is transferred to a transfer-receiving medium to form a color proof.

[0005] Japanese Unexamined Patent Publication No. Hei.
No. 72351 and No. 7-89231 describe a transfer image forming material comprising a transparent support provided with a releasable cushion layer or cushion layer, a photosensitive layer whose adhesiveness changes upon exposure, and a cover sheet. There has been disclosed a technique of transferring a light-exposed portion to a transfer medium to create a color proof or a printing plate.

In these techniques, since image exposure reaches the photosensitive layer surface through the support and other layers due to back exposure, a spatial image shift and contrast deterioration are large, and halftone dot reproduction is difficult. There has been a problem of significant deterioration.

[0007]

In order to solve the above problems, an object of the present invention is to perform exposure (back exposure) from the side opposite to the side having a photosensitive layer on a support to form a transferred image. It is an object of the present invention to provide a transfer image forming material having improved halftone dot reproducibility of a transfer image forming material, and a method for producing the same.

[0008]

The above objects of the present invention have been attained by the following means.

[0009] Transfer image formation in which a transfer image forming material having a photosensitive layer provided on a transparent support is image-exposed from the transparent support side, and an image formed on the transparent support is transferred to a transfer receiving medium to form an image. Transfer image formation, wherein the refractive index of each of a plurality of layers provided between the transparent support and the photosensitive layer, for example, an anchor layer, a cushion layer, and a release layer, is smaller than the refractive index of the transparent support. material.

[0010] Transfer image formation in which a transfer image forming material having a photosensitive layer provided on a transparent support is image-exposed from the transparent support side, and an image formed on the transparent support is transferred to a transfer receiving medium to form an image. In the material, the absolute value of the difference between the refractive index of the plurality of layers provided between the transparent support and the photosensitive layer, for example, the anchor layer, the cushion layer, and the release layer, and the refractive index of the photosensitive layer is less than 0.07. A transfer image forming material characterized by the following.

In a transfer image forming material in which a cushion layer and a photosensitive layer are provided in this order on a transparent support, the cushion layer is coated with a coating solution having an absolute value of a difference between solubility parameters of a coating solvent and a solute of less than 1.5. Or a transfer image forming material as described in the above item.

[0012] In the method for producing a transfer image forming material according to the above item or the item, the difference in solubility parameter between the anchor layer and the cushion layer and the difference between the solubility parameter in the cushion layer and the release layer may be different. Wherein the absolute value of is 5 or more.

Hereinafter, the present invention will be described specifically.

(Refractive index) The refractive index in the present invention is AST
It is defined in M standard D542.

(Solubility Parameter) The solubility parameter is an amount represented by δ = (ΔH / V) ^1/2 where ΔH is the heat of evaporation per mol of liquid and V is the volume thereof. Solubility parameter value (SP
Value) was measured using a coating solvent: J.I. BRANDRUP, E.
H. IMMERGUT, Polymer Handbo
ok 2nd Edition, John Wille
y & Sons, New York, 1975, IV-33
The data described in No. 7 was used.

Solute: The solute is dissolved in a solvent (single or mixed) having different solubility parameters, and the solubility (solubility, dissolution speed) and swelling optimum solvent are determined to determine the solubility parameter of the solute. Substances having similar dissolution parameter values are easily dissolved.

The SP value unit is represented by [cal / cm ³ ] ^1/2 .

(Photosensitive Layer) For the photosensitive layer of the present invention, a known photosensitive composition such as a photopolymerizable type, a photodimer type, and a quinonediazide compound can be used. Representative photosensitive compositions are listed below.

Examples of the polymerizable compound used in the photopolymerizable photosensitive composition include an ethylenically unsaturated compound capable of undergoing addition polymerization. The ethylenically unsaturated compound includes monomers, prepolymers, ie, dimers, trimers, tetramers, and oligomers (polymers or polycondensates having a molecular weight of 10,000 or less), mixtures thereof, and copolymers thereof. I do.

Suitable ethylenically unsaturated compounds are acrylic acid esters and methacrylic acid esters of polyhydric alcohols, such as ethylene glycol, triethylene glycol, tetraethylene glycol, propylene glycol, trimethylolpropane, pentaerythritol, Acrylic esters such as pentyl glycol and methacrylic esters may be mentioned as examples.

Acrylic esters and methacrylic esters modified from bisphenol A, for example, reaction products of bisphenol A-epichlorohydrin epoxy resin prepolymer with acrylic acid or methacrylic acid, bisphenol A alkylene oxide adducts or An acrylic acid ester, a methacrylic acid ester, or the like of the hydrogenated product may be used.

Apart from these ester compounds, methylenebisacrylamide, methylenebismethacrylamide and bisacryl or bismethacrylamide of diamines such as ethylenediamine, propylenediamine, butylenediamine and pentamethylenediamine are also useful.

Also suitable are reaction products of diol monoacrylate or diol monomethacrylate with diisocyanate, triacrylformal or triallyl cyanurate.

Apart from these monomeric compounds, a linear polymer compound having an acryloyloxy group and / or a methacryloyloxy group in the side chain, for example, a ring-opening copolymer of glycidyl methacrylate and a vinyl copolymer of glycidyl methacrylate Acrylic acid addition reactants and methacrylic acid addition reactants of the polymer can also be used.

The photopolymerization initiator used in the photopolymerization type photosensitive composition is a generally known one which is effective in combination with an ethylenically unsaturated compound, and includes, but is not limited to, the following compounds: Not something.

Specific examples include acyloin; acyloin derivatives such as benzoin methyl ether, benzoin ethyl ether and benzoin butyl ether; decyl bromide;
Decyl chloride, decylamine, etc .; ketones, such as benzophenone, acetone phenone, benzyl and benzoylcyclobutanone; substituted benzophenones, such as Michler's ketone, diethoxyacetone, halogenated acetone, and benzophenone; Polynuclear cyclic quinones such as thioxanthone derivatives such as quinone and benzoquinone, anthraquinone and phenanthrenequinone; substituted polynuclear cyclic quinones such as chloroanthraquinone, methylanthraquinone, octamethylanthraquinone, naphthoquinone and dichloronaphthoquinone; halogenated aliphatic and alicyclic Aromatic and aromatic hydrocarbons and mixtures thereof, provided that halogen is chlorine, bromine, fluorine, iodine or the like. For example, mono- and polychlorobenzene, mono- and polybromobenzene, mono- and polychloroxylene, mono- and polybromoxylene, dichloromaleic anhydride, 1- (chloro-2-methyl) naphthalene, 2,4-dimethylbenzene chloride Morphonyl, 1
-Bromo-3- (m-phenoxyphenoxy) benzene, 2-bromoethylmethyl ether, chlorendic anhydride and its corresponding ester, chloromethylnaphthyl chloride, chloromethylnaphthalene, bromomethylphenanthrene, diiodomethylanthracene, hexachlorocyclopentadiene, Hexachlorobenzene, octachlorocyclopentene and their compounds, lophine dimer and N-methyl-2-benzoylmethylene-β-naphthothiazole, represented by N-ethyl-2- (2-thenoyl) methylene-β-naphthothiazole Heterocyclic compounds.

In the present invention, as a photopolymerization initiator, JP-B-59-42684, JP-B-6-76444, and 5-
Coumarin derivatives described in each of JP-A-85562,
For example, 3-benzoyl-7-methoxycoumarin, 3,
3'-carbonylbis (7-dimethylaminocoumarin), 3- (2'-oxadiazoyl-5'-phenyl) -7-diethylaminocoumarin and the like can also be used. Examples of the photopolymerization initiator include “Photopolymer Technology” (Nikkan Kogyo Shimbun, 1988), No. 26
Typical compounds are disclosed on pages 50 to 50 and 113 to 123. Among the photopolymerization initiators described herein, for example, 3,3 ', 4,4'- Tetrakis (t-butyloxycarbonyl) benzophenone, imidazole dimer, 9,10-dibromoanthracene,
-Naphthalene sulfonyl chloride, benzoyl peroxide,
Onium salts and the like are described, and any of these can be used. Also, JP-A-5-341523,
JP-A-58-174402 and JP-A-58-174939.
And JP-A-5-249675, for example. As the photopolymerization initiator, a water-soluble one can be used, but a water-insoluble one is preferred from the viewpoint of photosensitivity and water resistance.

The photodimerizable photosensitive composition contains a photodimerizable group or a compound having a photodimerizable structure.
Such a photodimerizable group or a photodimerizable structure has a structure represented by the following structural formulas (1) to (8) in a compound or at a terminal or a side chain of the compound.

[0029]

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(R ₁ represents an aryl group or a heterocyclic group,
These are an alkyl group having 1 to 10 carbon atoms, an alkoxy group,
It may contain a nitro group, amino group, alkoxycarbonyl group, acyloxy group, alkanoyl group, cyano group or azide group. R ₂ is a hydrogen atom or a carbon number of 1 to 10
Wherein R ₃ is a hydrogen atom, having 1 to 10 carbon atoms.
Represents an alkyl group, an aryl group, an alkanoyl group or a cyano group. n shows the integer of 0-5. )

[0031]

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(R ₁ has the same meaning as in the structural formula (1), and
Represents an aryl group. R ₄ is a hydrogen atom, a halogen atom,
It represents an alkyl group having 1 to 10 carbon atoms or a cyano group. )

[0033]

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Compounds having such a structure include, for example, cinnamate, β-furyl acrylate,
α-cyanocinnamate, p-azido cinnamate, β-styryl acrylate, α-cyano-
β-styryl acrylate, p-phenylenediacrylate, p- (2-benzoylvinyl) -cinnamate, β-naphthyl acrylate, cinnamylidenpyruvate, α-methyl-β-styryl Acrylic acid esters, α-phenyl-β-styryl acrylate, α-cyano-β-furyl acrylate, p-dimethylaminocinnamate,
Furthermore, amides, chalcones corresponding to the above esters,
Benzylideneacetone, stilbazole, stilbene,
Examples include, but are not limited to, α-phenylmaleimide, coumarin, pyrone, anthracene, dibenzazepine, and derivatives thereof.

The following are examples of monomers, oligomers and polymers having one or more photodimerizable groups or photodimerizable structures in the same molecule.

(1) A reaction product of an excess polyhydric alcohol with an acid chloride having a photodimerizable group. For example

[0037]

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(N is an integer of 0 to 5, X is H or C
N. R is a polyhydric alcohol residue, l ≧ m) (2) An epoxy ester bond —CH (OH) —CH ₂ O— obtained by reacting a compound having an epoxy group with a carboxylic acid having a photodimerizable group. Reaction products with CO-.

(3) An oligomer or polymer obtained by synthesizing an acrylic or methacrylic monomer having a hydroxyl group and a photodimerizable group and radically polymerizing the same.

(4) An oligomer or polymer obtained by copolymerizing an acrylic or methacrylic monomer having a photodimerizable group with an acrylic or methacrylic monomer having a hydroxyl group.

(5) A reaction product of a compound having a reactive halogen and hydroxyl group in the same molecule and a carboxylate having a photodimerizable group.

(6) Acetal obtained by reacting excess polyhydric alcohol with aldehyde having a photodimerizable group.

The typical synthetic prescriptions are listed above, but the present invention is not limited to these. The photodimerizable group or the photodimerizable group described in the literature relating to the synthesis of the photodimerizable photosensitive resin known in the prior art is listed. The method of introducing a possible structure can be widely applied to the synthesis prescription of a compound having a photodimerizable group structure as a component of the photodimerizable colored photosensitive layer of the present invention, that is, a photodimerizable group or structure shown in these documents. The components of the photoadhesive layer of the present invention can be synthesized by the introduction formulation.

For a summary of the literature relating to the synthesis of a photodimerizable photosensitive resin, see, for example, R & D Report No. 7, Synthesis and application of photosensitive resin, pages 1 to 93, Chapter 1 Synthesis of photopolymer, written by Masao Kato and Tadaomi Nishikubo.

Examples of the polymer having a cinnamic acid group in the main chain include:
For example, a polycondensate of phenylenediacrylic acid or an alkyl ester thereof and a polyol may be mentioned. In particular,
Polycondensate of 1,4-phenylenediacrylic acid with 1,4-di-β-hydroxyethoxycyclohexane, 1,4
A polycondensate of phenylenediacrylic acid with triethylene glycol and hydrogenated bisphenol A, a polycondensate of 1,3-phenylenediacrylic acid with 1,4-di-β-hydroxyethoxycyclohexane, 2,5- Dimethoxy-
Examples include a polycondensate of 1,4-phenylenediacrylic acid and 1,4-di-β-hydroxyethoxycyclohexane, and a polycondensate of 2-nitro-1,4-phenylenediacrylic acid and diethylene glycol.

As the quinonediazide compound, an o-quinonediazide compound can be used. The o-quinonediazide compound is a compound having at least one o-quinonediazide group, preferably an o-benzoquinonediazide group or an o-naphthoquinonediazide group, and is a known compound having various structures, for example, "Light-sensitive" by J. Coser. Systems "(John Willy and Sams, Inc., 1965) pp. 339-353. Examples include esters of various hydroxyl compounds with benzoquinone-1,2-diazidosulfonic acid, naphthoquinone-1,2-diazidosulfonic acid, and the like.

The hydroxyl compounds used include:
Polyhydroxybenzophenones, such as dihydroxybenzophenone, trihydroxybenzophenone, tetrahydroxybenzophenone, pentahydroxybenzophenone, octahydroxybenzophenone, or derivatives thereof, such as halogen atoms, alkyl groups, aryl groups,
Aralkyl group, substituted carboxylic acid group or the like, or a phenol, such as phenol, cresol and pyrogallol, and a condensation resin of a carbonyl group-containing compound such as formaldehyde, benzaldehyde and acetone, particularly a resin obtained by condensation in the presence of an acidic catalyst Is mentioned.

Preferred hydroxyl compounds include trihydroxybenzophenone, tetrahydroxybenzophenone, phenol / formaldehyde resin, cresol / formaldehyde resin, pyrogallol / acetone resin, resorcin / benzaldehyde resin, more preferably 2,3,4-trihydroxybenzophenone, 2,
3,4,4'-tetrahydroxybenzophenone, pyrogallol-acetone resin.

Representative examples of the o-quinonediazide compound include 1,2-naphthoquinone-2-diazide-5.
-Sulfonic acid, 1,2-naphthoquinone-2-diazide-
4-sulfonic acid, 1,2-naphthoquinone-2-diazide-5-sulfonic acid and the like and o-naphthoquinonediazidosulfonic acid ester of polyhydroxybenzophenone; benzoquinone-1,2-diazidosulfonic acid or naphthoquin-1,2 Esters of diazidesulfonic acid with phenol-formaldehyde resin or cresol-formaldehyde resin; naphthoquinone-1,2-diazide-5-sulfonic acid and resorcinol-benzaldehyde described in JP-A-56-1044. Esters with resins;
Ester of naphthoquinone-1,2-diazidosulfonic acid and pyrogallol-acetone resin described in U.S. Pat. No. 3,635,709;
No. 46, naphthoquinone-1,2-diazide-5-sulfonic acid and resorcinol-pyrogallol-
Esters with acetone copolycondensates.

Other useful o-quinonediazide compounds include o-quinonediazide compounds described in Japanese Patent Application Laid-Open No. Sho.
Esterification reaction of naphthoquinonediazidosulfonyl chloride; a homopolymer of p-hydroxystyrene or a copolymer with another copolymerizable monomer as described in JP-A-50-113305, and o-
Esterification reaction of naphthoquinonediazidosulfonyl chloride; bisphenol-formaldehyde resin described in JP-B-54-29922 and o
Esters with quinonediazidesulfonic acid; copolymers such as alkyl acrylates, acryloyloxyalkyl carbonates, hydroxyalkyl acrylates described in U.S. Pat. No. 3,859,099, and o.
Condensates with quinonediazidosulfonyl chloride; reaction products of copolymerization products of styrene and phenol derivatives described in JP-B-49-17481 with o-quinonediazidesulfonic acid; US Pat. No. 3,759,711 And amides of o-naphthoquinonediazidosulfonic acid or o-naphthoquinonediazidocarboxylic acid with copolymers of p-aminostyrene and other copolymerizable monomers as described in this publication.

The photosensitive layer can be colored by incorporating the following coloring agents. Various dyes and pigments can be used as the colorant. In particular, when used for color proofing, pigments and dyes having a color tone that matches the ordinary colors generally required therefor, ie, yellow, magenta, cyan, and black, are required. In some cases, such as when used for a color filter, blue, green, and red pigments and dyes are required. In addition, metal powder, white pigment, fluorescent pigment, and the like can be used. When the image forming material of the present invention is applied to, for example, a color proof for color image proofing and other colored image forming materials, any of a number of pigments and dyes known in the art, such as the following, may be optionally used. Can be. The following are some examples of various pigments and dyes that can be used in the present invention. These are organic pigments or dyes of azo type, phthalocyanine type, quinacridone type, anthraquinone type, indigo type, methine type and the like, or inorganic pigments. Some specific examples of these are described below.

(CI means color index) Lemon Chrome Yellow M35 (CI 77603) Medium Chrome Yellow (CI 77600) Molypdate Orange (CI 77605) Miloli Blue 671 ( CI 77510) Seikalite Blue (CI. 74200) Seikalite Rose (CI. 45160: 1) Seikalite Magenta (CI. 45170: 2) Seikalite Blue (CI. 42595: 2) Seikalite Violet B800 (CI. 42535: 2) Seika Fast Lake Red CZA665 (CI. 15585: 1) Seika Fast Red LR116 (CI. 15630: 1) Seika Fast Carmine 6B 1488 (CI. I. 15850: ) Seika First Red 8040 (CI. 15865: 1) Seika First Yellow 10GH (CI. 11710) Seika First Yellow GH (CI. 11680) Seika First Yellow 2015 (CI. 11741) Seika First Yellow A-3 (CI. 11737) Seika First Yellow 2300 (CI. 21090) Seika First Yellow 2200 (CI. 21095) Seika First Yellow 2400 (CI. 21105) Seika First Yellow 2600 (CI. I.21100) Seika First Yellow 2500 (CI.21096) Seika First Yellow 2720 (CI.21108) Seika First Orange 2900 (CI.21160) Kafast Orange 900 (CI. 21110) Seika First Orange 3044 (CI. 12075) Seika Fast Red 930 (B) (CI. 21120) Seika First Scarlet G conc (CI. 12315) Seika First Carmine 3840 (C.I. 12490) Seika Fast Carmine 3870 (C.I. 12485) Seika Fast Rubin RK-1 (C.I. 12317) Seika First Violet FR (C.I. 12322) Chromofine Blue 4920 (C. .I.74160) Chromofine Green 2GO (CI.74260) Chromofine Yellow 5910 (C.I. I. 23035) Chromofine Orange 6726 (CI not listed) Chromofine Scarlet 6750 (CI not listed) Chromofine Red 6820 (CI46500) Chromofine Violet (CI51319) Daimler Seika Co., Ltd. Shimla First Yellow 8GTF (CI. 21105) Shimla First Yellow 4186 (CI. 11767) Shimla First Yellow 4193G (CI. 21100) Shimla First Yellow GHK-N4 (C .I.21090) Shimla first yellow GTF230T (CI not listed.) Shimla first yellow RF (CI.21096) Shimla first yellow 4181 ( 21108) Fast Gen Super Yellow GRO (CI. 56280) Shimla Fast Pyrazolone Orange G (CI. 21110) Shimla Fast Orange V (CI. 21160) Shimla Fast Orange 4183H (CI. 11780) ) Shimla Lake Red C conc 130 (CI. 15585: 1) Shimla Neo Thor Red 2BY (CI. 15565: 1) Shimla Red 2BS (CI. 15865: 1) Fastgen Super Red 2Y (C.I. I.73905) Fast Gen Super Red 7083Y (CI. 46500) Shimla Red 3013 (CI. 15865: 2) Shimla Priliant Carmine 6B246 (CI. 15850: 1) Fast Gen -Permagenta R (CI.73915) Fast Gen Super Violet RNS (CI.51319) Fast Gen Super Blue 6016 (CI.69800) Fast Gen Blue BSF-A (CI.74160) Fast Gen Blue TGR -L (CI. 74160) Fast Gen Green S (CI. 74260) Fast Gen Green 2YK (CI. 74265) Oriental Yellow GT (CI. 11680) manufactured by Dainippon Ink Co., Ltd. Victoria Pure Blue (CI. 42595) Lionol Red 7B4401 (CI. 15830) Lionol Red 3901 (CI. 12120) Lionol Red FB5500 (CI. 12490) Lionol Red FBK (CI. 12490) No. 7100 Lionol Yellow (CI. 21096) Lionol Yellow FGG-3 (CI. 21127) Lionol Yellow NBR (CI. 21108) Lionol Yellow 1806-G (CI. 21127) Lionol Red 2BK (CI.15865: 4) Lionol Yellow K-5G (CI.13960) Lionol Yellow K-2R (CI.13955) Lionol Yellow FGG-3 (CI.11127) Lionol Blue 7210-V (CI 74160) Lionol Blue SM (CI 74160) Lionol Blue FG-7330 (CI 74160) Lionol Blue SPG-8 (CI 74160) Lionol Blue ESP-S (CI. 74160) Lionol Blue E (CI. 74160) Lionol Green B-201 (CI. 74260) Lionol Green Y-101 (CI. 74260) Lionol Green 6Y-501 (CI. 74160) Lionon Yellow GF (C.I. 70600) Rionogen Yellow 3G-F (C.I. not listed.) Rionogen Yellow RX-F (C.I. 66280) Rionogen Orange R.F. I.11780) Rionogen Orange GR-F (C.I. 71105) Rionogen Brown R.F. (C.I.12510) Rionogen Red YF (C.I. 46500) Rionogen Red 6B-F (C.I. 46500) Rionogen Red GD-F (C.I. 53900) Rionogen Magenta RF (C.I. 73915) Lionon Bio Red RL-F (CI. 51319) Lionon Blue RF (CI. 69800) Lionon Blue R3-F (CI. 69800) Toyo Ink Co., Ltd. Auramine (CI.41000) Carotene Brilliant Flavin (CI. Basic 13) Rhodamine 6GCP (CI. 45160) Rhodamine B (CI. 45170) Safranin OK 70: 100 (CI. 50240) Elio Glaucin X (CI. 42080) Fast Black HB (CI. 26150) Benzidine Yellow 4T-564D (CI. 21095) Mitsubishi Carbon Black MA-1000 Mitsubishi Carbon Black # 30, # 40, # 50 In the practice of the present invention, the coloring agent in the colored photosensitive layer or the colored layer Yuritsu can be determined in consideration of the optical density or the like to a target. In the present invention, the content of the coloring agent is preferably in the range of 5 to 40% by weight, particularly preferably in the range of 10 to 30% by weight. In the practice of the present invention, two or more kinds of pigments and dyes used as colorants may be used in combination.

As the binder constituting the colored photosensitive layer of the image forming material, a polymer compound having a carboxylic acid vinyl ester polymerized unit represented by the following general formula in the molecular structure can be preferably used.

RCOOCH = CH _{2 wherein} R represents an alkyl group having 1 to 17 carbon atoms.

Any polymer compound having the structure described above can be used arbitrarily. Examples of the vinyl carboxylate monomer for constituting the polymerized unit represented by the above general formula include the following. preferable. The name and chemical formula are shown together.

(1) vinyl acetate CH ₃ COOCH ＝ CH ₂ (2) vinyl propionate CH ₃ CH ₂ COOCH ＝ CH ₂ (3) vinyl butyrate CH ₃ (CH ₂ ) ₂ COOCH ＝ CH ₂ (4) vinyl pivalate (CH ₃ ) ₃ CCOOCH = CH ₂ (5) Vinyl caproate CH ₃ (CH ₂ ) ₄ COOCH = CH ₂ (6) Vinyl caprylate CH ₃ (CH ₂ ) ₆ COOCH = CH ₂ (7) Vinyl caprate CH ₃ (CH ₂ ) ₈ COOCH = CH ₂ (8) Vinyl laurate CH ₃ (CH ₂ ) ₁₀ COOCH = CH ₂ (9) Vinyl myristate CH ₃ (CH ₂ ) ₁₂ COOCH = CH ₂ (10) Vinyl palmitate _{CH 3 (CH 2) 14 COOCH} = CH 2 (11) vinyl stearate _{CH 3 (CH 2) 16 COOCH} = CH 2 (12) versatic acid vinyl

[0057]

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As the carboxylic acid vinyl ester monomer, those having 1 to 4 carbon atoms constituting the main chain of the carboxylic acid are more preferred. Particularly, vinyl acetate is preferred.

The above R includes an alkyl group having a substituent, that is, a vinyl ester of a substituted carboxylic acid is also included in the polymerized unit.

The above polymer compound may be a polymer obtained by polymerizing one kind of vinyl carboxylate, a polymer obtained by copolymerizing two or more kinds of vinyl carboxylate, or a polymer obtained by copolymerizing vinyl carboxylate with the same. It may be a copolymer in any component ratio with another polymerizable monomer.

Examples of the monomer unit which can be used in combination with the polymerization unit represented by the above general formula include ethylenically unsaturated olefins such as ethylene, propylene, isobutylene, butadiene and isoprene, for example, styrene, α-methyl Styrene, p-methylstyrene, p-
Styrenes such as chlorostyrene, for example, acrylic acid such as acrylic acid and methacrylic acid, for example, itaconic acid, maleic acid, unsaturated aliphatic dicarboxylic acids such as maleic anhydride, for example, diethyl maleate, dibutyl maleate,
Diesters of unsaturated dicarboxylic acids such as di-2-ethylhexyl maleate, dibutyl fumarate, di-2-ethylhexyl fumarate, for example, methyl acrylate, ethyl acrylate, n-butyl acrylate, isobutyl acrylate, acrylic acid Α- such as dodecyl, 2-chloroethyl acrylate, phenyl acrylate, methyl α-chloroacrylate, methyl methacrylate, ethyl methacrylate
Methylene aliphatic monocarboxylic acid esters, for example, acrylonitrile, nitriles such as methacrylonitrile,
For example, amides such as acrylamide, for example, anilides such as acrylanilide, p-chloroacrylanilide, m-nitroacrylanilide and m-methoxyacrylanilide, for example, methyl vinyl ether, ethyl vinyl ether, isobutyl vinyl ether, β-chloroethyl vinyl ether and the like Vinyl ethers, vinyl chloride, vinylidene chloride, vinylidene cyanide, for example, 1
-Methyl-1-methoxyethylene, 1,1-dimethoxyethylene, 1,2-dimethoxyethylene, 1,1-dimethoxycarbonylethylene, ethylene derivatives such as 1-methyl-1-nitroethylene, for example, N-vinylpyrrole, N-vinyl carbazole, N-vinyl indole,
N- such as N-vinylpyrrolidene and N-vinylpyrrolidone
There are vinyl monomers such as vinyl compounds. These vinyl monomers generally have a structure in which an unsaturated double bond is cleaved and are present in a polymer compound.

When a polymer compound represented by the above general formula is used as the binder, a compound having a vinyl acetate polymerized unit in the molecular structure is particularly preferred. Among them, those having a vinyl acetate polymerization unit of 40 to 95 wt%, and having a number average molecular weight (MN) of 1,000 to 100,0
00, having a weight average molecular weight (MW) of 5,000 to 5
A thing of 00,000 is preferred.

More preferably, a polymer compound having a vinyl acetate polymerized unit (particularly 40 to 95% by weight) and a carboxylic acid vinyl ester polymerized unit having a longer chain than vinyl acetate is preferable, and a number average molecular weight (MN) is particularly preferable. 2,00
0-60,000, weight average molecular weight (MW) of 10,000
It is preferably from 00 to 150,000.

In this case, the monomer constituting the polymer compound having a vinyl acetate polymerized unit by copolymerizing with vinyl acetate is arbitrary as long as it can form a copolymer. You can choose arbitrarily from your body.

The copolymers which can be used as the polymer compound are listed below by showing their monomer components. However, as a matter of course, the present invention is not limited to the following example.

(1) Vinyl acetate-acrylate (2) Vinyl acetate-maleic acid ester (3) Vinyl acetate-ethylene (4) Vinyl acetate-vinyl carboxylate (5) Vinyl acetate-styrene (6) Vinyl acetate -Crotonic acid (7) vinyl acetate-maleic acid (8) vinyl acetate-2-ethylhexyl acrylate (9) vinyl acetate-di-2-ethylhexyl maleate (10) vinyl acetate-methyl vinyl ether (11) vinyl acetate-vinyl chloride (12) Vinyl acetate-N-vinylpyrrolidone (13) Vinyl acetate-vinyl propionate (14) Vinyl acetate-vinyl pivalate (15) Vinyl acetate-vinyl versatate (16) Vinyl acetate-vinyl laurate (17) Acetic acid Vinyl-vinyl stearate (18) Vinyl acetate-bar Vinyl acetate-ethylene (19) Vinyl acetate-vinyl versatate-2-ethylhexyl acrylate (20) Vinyl acetate-vinyl versatate-vinyl laurate (21) Vinyl acetate-vinyl versatate-crotonic acid (22) Vinyl propionate -Vinyl versatate (23) vinyl propionate-vinyl versatate-
Crotonic acid (24) Pivalic acid-vinyl stearate-maleic acid A novolak resin can also be used as a binder.

Incidentally, the measurement of the molecular weight of the high molecular compound is performed by GP
C (gel permeation chromatography). The calculation of the number average molecular weight MN and the weight average molecular weight MW is based on the method described in Morio Tsuge, Tatsuya Miyabayashi, and Masayuki Tanaka, “Journal of the Chemical Society of Japan”, pages 800 to 805 (1972). (Connecting the center of the peak and the center of the valley).

Further, in the present invention, other polymer compounds that can be used as a binder for the colored photosensitive layer include sulfoalkyl esters of (meth) acrylic acid (co) polymer, vinyl acetal (co) polymer, Vinyl ether (co) polymer, acrylamide (co) polymer, styrene (co) polymer, cellulose derivatives and the like can also be mentioned.

(Cushion Layer, Release Cushion Layer) The cushion layer will be described.

The resin used for the cushion layer of the present invention preferably has a VICAT softening temperature of -30 to 65 ° C. The VICAT softening temperature here is JIS-K
Refers to a value measured by the method A shown in -7206-199. The value obtained by preparing and measuring a 3 mm thick test piece was VICA
Let it be T softening temperature.

The thermoplastic resin used in the releasable cushion layer of the present invention has a softening point of an organic polymer substance of 65 ° C. or lower, preferably 60 ° C. or lower, particularly preferably 50 ° C. or lower according to the VICAT method. is there. Specific examples of those having a softening point of 65 ° C. or lower include polyolefins such as polyethylene and polypropylene, ethylene copolymers such as ethylene and vinyl acetate or copolymers of ethylene and acrylate, polyvinyl chloride, vinyl chloride and acetic acid. Vinyl chloride copolymers such as copolymers with vinyl, polyvinylidene chloride, vinylidene chloride copolymers, polystyrene, styrene copolymers such as copolymers of styrene and (meth) acrylate, polyvinyl toluene And vinyltoluene copolymers such as copolymers of vinyltoluene and (meth) acrylic acid esters, and poly (meth) acrylates such as poly (meth) ethyl acrylate and poly (butyl) methacrylate and vinyl acetate copolymers. ) Acrylate copolymers, vinyl acetate copolymer nylon, copolymer nylon, -At least one compound selected from organic polymer compounds such as polyamide resin such as alkoxymethylated nylon, natural rubber, synthetic rubber and the like is preferable, and further, "Plastic Performance Handbook" (Japan Plastics Industry Federation, All Japan Plastics Molding Industry Association) Edited by the Society of Industry, published by the Industrial Research Institute, published on X25 / 25/68)
An organic polymer compound having a temperature of 5 ° C. or lower can be used.
In these organic polymer compounds, it is also possible to add various plasticizers and additives compatible with the compound to lower the substantial softening point, and the softening point is 65 ° C. or higher. Even with thermoplastic resins, the softening point can be substantially reduced to 65 ° C. or lower by adding a plasticizer compatible with these resins.

The method for providing the cushion layer on the support is as follows. (1) A solution in which a resin is dissolved in an organic solvent is applied on the support, dried by hot air or heating, and then the cover sheet is overlaid. A so-called dry lamination method in which the laminate is pressed and laminated.

(2) While the resin is heated as it is and kept in a molten state, it is necessary to apply a cover sheet immediately after applying the resin on a support by a doctor blade method, a roll coating method, a gravure method, a reverse roll method or the like. A so-called hot melt lamination method in which lamination is performed by heating at a high temperature and then cooling according to the conditions.

(3) A so-called extrusion lamination method in which the resin is directly heated, extruded onto a support by an extruder while maintaining the molten state, and the cover sheet is pressed and laminated while the resin is in the molten state.

(4) Using a plurality of extruders or an extruder having a plurality of extruding ports on a support by a melt extrusion method, forming two or more types of layers on the support by one molding; Similarly, a so-called co-extrusion method in which the cover sheet is pressed and laminated while it is in a molten state.

(5) A so-called solution coating method in which a solution obtained by dissolving a resin in an organic solvent or water is coated on a support and dried by hot air or heating.

(6) The resin is dissolved while heating in an organic solvent which does not dissolve at room temperature, and the resin is cooled to obtain an organic solvent dispersion of a resin solid, which is coated on a support, dried and dried. A method in which the resin solid fine particles are fused to form a layer by calendering according to the above.

And the like. When the cushion layer is manufactured in the present invention, a method including a laminating or calendering step is preferable.

(Release Layer) In the present invention, a release layer can be provided on the cushion layer if necessary. Examples of the resin used as the release layer include polyethylene, polypropylene and ethylene-propylene copolymer. , Ethylene-α-
Olefin copolymer, polyolefins such as propylene-α-olefin copolymer, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, ethylene-propylene-diene copolymer, ionomer resin, copolymerized nylon, Examples include silicone resins, fluororesins, celluloses such as methylcellulose, ethylcellulose, butylcellulose, hydroxypropylcellulose and hydroxypropylmethylcellulose, and derivatives thereof such as formalized products and acetalized products.

The above-mentioned olefins and celluloses can be used alone or as a mixture of two or more resins.
When two or more resins are mixed and used, the weight percent of polyolefin or cellulose in the total resin solid content is 20%.
It is desirable that this is the case.

As a means for providing a release layer on the cushion layer, the following method can be used.

(1) After a release layer is laminated on a previously provided cushion layer by coating or laminating, or simultaneously with the lamination, the V of the cushion layer or the release layer is
A method of heating to a temperature higher than the ICAT softening point temperature, applying pressure if necessary, and peeling and removing the temporary support as needed.

(2) A release layer is provided on the temporary support by a method such as coating or laminating, and the cushion layer surface of the cushion layer provided in advance and the release layer surface on the temporary support are bonded, and thereafter or after bonding. At the same time, a method of heating to a temperature higher than the VICAT softening point temperature of the cushion layer or the release layer to peel and remove the temporary support.

(3) A release layer is provided on the temporary support by a method such as coating or laminating, and the cushion layer and the cushion layer provided by a method such as hot melt lamination or extrusion lamination are in a molten state. A method in which the temporary support is peeled off and bonded together.

When a lithographic printing plate or a color proof is prepared by applying the transfer image forming material of the present invention, there are cases where a wet process and a dry process are used. These will be described below.

(Preparation of Dry Process Printing Plate) In the case of the dry process, the image forming material of the present invention is imagewise exposed, and the unexposed portion is transferred to a grained aluminum plate by utilizing the difference in adhesiveness. Exposure to actinic radiation forms a printing plate.

The imagewise exposure of the image forming material may be carried out with an appropriate exposure light source according to the type of the photosensitive compound (photopolymerizable compound). For example, an appropriate original image (half positive film etc.)
Can be exposed using a high-pressure mercury lamp.

The unexposed portion (image portion) of the image forming material may be transferred by pressure transfer or thermal transfer as appropriate. For example, the image surface and the grained aluminum plate are brought into close contact with each other, and the transfer is performed by pressing. Can be done.

The transferred aluminum plate is exposed again by actinic rays, and this exposure can be performed in the same manner as the above-described exposure of the image forming material. By this exposure, a reproduced image can be further strengthened.

As described above, in this case, there is no need to perform development using a developer, and a printing plate can be obtained by simple and easy steps.

(Dry Processing Color Proof Creation)
Provide holes for register pins in the color separation image mask and proofing sheet. Next, exposure to light sufficient for curing of the proofing sheet is performed through a color separation mask image to the photosensitive layer or the photosensitive material layer using an actinic ray such as image exposure or ultraviolet rays.

Next, the cover sheet is peeled off, the photosensitive layer or the photosensitive material layer is overlaid on an image receptor such as paper, and transfer is performed under pressure or, if necessary, under heating.

An image formed on a photosensitive layer or a color material layer and a light-sensitive material layer on an image receptor by having one end of a support and peeling off is left on the image receptor to form a transfer image. .

Post-exposure is carried out for the purpose of strengthening the fixation on the entire surface of the transferred image and eliminating the viscosity of the transferred image surface.

The above operation is repeated four times (yellow, magenta, cyan, black) in, for example, color proofing to obtain a reproduced image of four colors.

(Wet treatment) In the case of Wet treatment, the colored image forming material is imagewise exposed in the same manner as in the case of Dry, and then developed with a developing solution as described below, and only the image portion of the formed colored image is formed. Is transferred onto a material to be transferred to prepare a lithographic or color proof.

(Developer) In the development performed after the colored image forming material is imagewise exposed, an alkaline developer preferably containing water as a main solvent is preferably used as the developer. Alkali agents include sodium carbonate, sodium hydrogen carbonate, sodium silicate,
Potassium silicate, sodium hydroxide, lithium hydroxide,
Sodium tertiary phosphate, dibasic sodium phosphate, tertiary potassium phosphate, dibasic potassium phosphate, tertiary ammonium phosphate, dibasic ammonium phosphate, sodium metasilicate, sodium bicarbonate, potassium carbonate, ammonium carbonate, Inorganic alkali agents such as ammonium silicate and organic alkali agents such as mono-, di- or triethanolamine and tetraalkylammonium hydroxide are used. The content of the alkali agent in the developer composition is 0.1%.
The alkaline developer is further preferably an organic solvent such as ethylene glycol monophenyl ether, benzyl alcohol, or n-propyl alcohol, a surfactant, a sulfite, or a chelating agent such as EDTA. An antifoaming agent such as an organic silane compound may be contained.

Further, as the material to be transferred for developing the colored image forming material after imagewise exposure and transferring the formed colored image, general printing paper such as art paper, coated paper, woodfree paper, synthetic paper and the like can be used. Can be used.

[0099]

EXAMPLES The effects of the present invention will now be illustrated by examples.

Example 1 An ethylene-vinyl acetate copolymer resin EVAFLEX was formed on a polyethylene terephthalate film having a thickness of 75 μm.
(Manufactured by Mitsui Dupont Polychemical Co., Ltd.) with a thickness of 30 μm
A cushion layer was formed by an extrusion lamination method so that On this cushion layer, 1,2-polybutadiene RB830 (manufactured by Nippon Synthetic Rubber Co., Ltd.)
It was coated with a toluene solution to a thickness of μm to form a release layer.

Then, a coating solution for a colored photosensitive layer having the following composition was applied on the release layer. A 6 μm-thick polyethylene terephthalate film was laminated on the dried colored photosensitive layer to provide a cover sheet, thereby preparing an image forming material.

<Colored Photosensitive Layer Solution (Magenta)> Diallyl isophthalate prepolymer Mn45000 (manufactured by Osaka Soda Co., Ltd.) 21 parts KAYARAD DPHA (manufactured by Nippon Kayaku Co., Ltd.) 7 parts Benzophenone 0.6 part 4,4 bis -Diethylaminobenzophenone EAB (manufactured by Hodogaya Chemical Co., Ltd.) 0.1 part Hydroquinone 0.001 part Lionol Red 6BFG4219X (manufactured by Toyo Ink Co., Ltd.) 5 parts Methyl ethyl ketone 78 parts The transparent support side of this image forming material and a plate control wedge (PCW, UGRA), UV printer HMW-201KB (Oak Mfg. Co., Ltd.)
After imagewise exposure is performed, the image forming material and the wedge are peeled off, and the art paper and the image forming material from which the cover sheet has been peeled off are adhered to each other using a first laminator 8b-700 special type (Taisei Laminator Co., Ltd.). Pressure 4kg /
When the image was transferred by nip between rollers under the conditions of cm ² , a passage speed of 35 cm / min, and a roller surface temperature of 80 ° C., a transferred image having good dot reproducibility was obtained on art paper.

Example 2 On a polyethylene terephthalate film having a thickness of 75 μm, an ethylene-vinyl acetate copolymer resin (EVAFLEXP-2807 manufactured by DuPont-Mitsui Polychemicals Co., Ltd.) having a thickness of 3
A releasable cushion layer was formed by extrusion lamination to a thickness of 0 μm.

A dry film thickness of 2 μm was formed on the release cushion layer.
m, a coating solution for a colored photosensitive layer having the following composition is applied.
An image forming material was used.

<Colored photosensitive layer solution (yellow)> Vinyl acetate-vinyl versatate copolymer resin 21 parts KAYARD DPHA (manufactured by Nippon Kayaku Co., Ltd.) 7 parts 2,4-diethylthioxanthone 0.8 parts Hydroquinone 0.001 part Rio Nol Yellow FG30 (manufactured by Toyo Ink Co., Ltd.) 5 parts Methyl ethyl ketone 78 parts <Colored photosensitive layer solution (magenta)> Vinyl acetate-vinyl versatate copolymer resin 21 parts KAYARAD DPHA (manufactured by Nippon Kayaku) 7 parts 2,4-diethyl Thioxanthon 0.8 part Hydroquinone 0.001 part Lionol Red 7BFG4412 (manufactured by Toyo Ink Co., Ltd.) 5 parts Methyl ethyl ketone 78 parts <Colored photosensitive layer solution (cyan)> Vinyl acetate-vinyl versatate copolymer resin 21 parts KAYARD DPHA (Nihon Kagaku) Pharmaceutical) 7 parts 2,4-diethylthioxanthone 0.8 part Hydroquinone 0.001 part Lionol Blue FG7330 (manufactured by Toyo Ink Co., Ltd.) 5 parts Methyl ethyl ketone 78 parts <Colored photosensitive layer solution (black)> Vinyl acetate-vinyl versatate copolymer resin 21 parts KAYARAD DPHA (Nippon Kayaku Co., Ltd.) 7 parts 2,4-Diethylthioxanthone 0.8 parts Hydroquinone 0.001 part Mitsubishi Carbon MA7 (Mitsubishi Chemical Corporation) 5 parts Methyl ethyl ketone 78 parts Transparent support side of image forming material A plate control wedge (PCW, manufactured by UGRA) is closely adhered, imagewise exposed by a UV printer, HMW-201KB (manufactured by Oak Manufacturing Co., Ltd.), and then the image forming material and the wedge are peeled off. Immersed at 30 ° C for 30 seconds and rubbed with a sponge To form an image more releasable cushion layer.

<Developer> Potassium silicate (Nippon Kagaku Kogyo KK) 290 parts Perex NBL (Kao Corporation anionic surfactant) 50 parts Water 5000 parts Next, first laminator 8b-700 special type (Taisei Laminator Co., Ltd.) ), The art paper and the image forming material are brought into close contact with each other at a pressure of 4 kg / cm ² and a passing speed of 35 c.
When the image was transferred by the nip between the rollers under the conditions of m / min and the roller surface temperature of 80 ° C., a transferred image having good dot reproducibility was obtained on art paper. The results are summarized in Table 1.

Example 3 The procedure of Example 1 was repeated, except that the cushion layer was formed using the following coating solution for the cushion layer, and the results shown in Table 1 were obtained.

<Cushion Layer Coating Solution> Ethylene-vinyl acetate copolymer resin EVAFLEX P-2807 (manufactured by Mitsui DuPont Polychemicals) 20 parts Toluene 80 parts Example 4 A 75 μm-thick polyethylene terephthalate film was coated on a polyethylene terephthalate film. A vinyl acetate-vinyl alcohol copolymer resin is applied with a toluene solution to a thickness of 0.1 μm,
An anchor layer was formed. Ethylene on this anchor layer
An acrylic acid copolymer resin (manufactured by Toho Chemical Co., Ltd., 25% aqueous dispersion) was applied to a thickness of 30 μm to form a cushion layer. A 1,2-polybutadiene (RB830, manufactured by Nippon Synthetic Rubber Co., Ltd.) was applied on the cushion layer with a toluene solution to a dry film thickness of 1 μm to form a release layer.

Then, a coating solution for a colored photosensitive layer having the following composition was applied on the release layer. A 6 μm-thick polyethylene terephthalate film was laminated on the dried colored photosensitive layer to give a cover sheet, thereby obtaining an image forming material.

<Colored Photosensitive Layer Solution> 21 parts of diallyl isophthalate prepolymer (Osaka Soda Daiso Isdap Mn 45000) KAYARAD DPHA (manufactured by Nippon Kayaku Co., Ltd.) 6 parts Benzophenone 0.5 part 4,4bis-diethylaminobenzophenone 0 3 parts (EAB Hodogaya Chemical Co., Ltd.) Hydroquinone 0.001 part Lionol Blue FG7330 (Toyo Ink Co., Ltd.) 5 parts Methyl ethyl ketone 78 parts On the other hand, the aluminum plate was degreased with a 10 wt% aqueous sodium hydroxide solution. This was placed in a 1.8% hydrochloric acid bath at 25 ° C., 3
Electroetching was performed under the conditions of 0 A / dm ² and current density of 30 seconds, washed with water, and then in a 30% sulfuric acid bath at 30 ° C. and 6.5 A / dm.
Anodizing treatment was performed for 30 seconds under the conditions of ² . Next, a 1 wt% aqueous solution of sodium metasilicate was used for sealing at 85 ° C. for 30 seconds, washed with water and dried to prepare a grained aluminum plate as a support for a printing plate.

The transparent support side of the image forming material and the plate control wedge (manufactured by PCW UGRA) are brought into close contact with each other, and subjected to imagewise exposure using a UV printer, HMW-201KB (manufactured by Oak Manufacturing Co., Ltd.). And the wedge are peeled off, and the first laminator 8b-7
Using a special type 00 (manufactured by Taisei Laminator Co., Ltd.), the grained aluminum plate and the image forming material from which the cover sheet was peeled were brought into close contact with each other, and the pressure was 4 kg / cm ² and the passing speed was 35 c.
When the image was transferred by nip between rollers under the conditions of m / min and roller surface temperature of 80 ° C., a transferred image having good dot reproducibility was obtained on the aluminum plate. The results are summarized in Table 1.

Comparative Example 1 An ethylene-vinyl acetate copolymer resin EVAFLEX P-14 was formed on a norbornene resin film having a thickness of 80 μm.
07 (manufactured by Mitsui Dupont Polychemical Co., Ltd.) with a thickness of 30
A cushion layer was formed by extrusion lamination to a thickness of μm. On this cushion layer, 1,2-polybutadiene RB830 (manufactured by Nippon Synthetic Rubber Co., Ltd.) was applied with a toluene solution to a dry film thickness of 1 μm to form a release layer.

Then, a coating solution for a colored photosensitive layer having the following composition was applied on the release layer. A 6 μm-thick polyethylene terephthalate film was laminated on the dried colored photosensitive layer to give a cover sheet, thereby obtaining an image forming material.

<Colored photosensitive layer solution (magenta)> Vinyl acetate-vinyl versatate copolymer resin 21 parts KAYARD DPHA (manufactured by Nippon Kayaku Co., Ltd.) 7 parts 2,4-diethylthioxanthone 0.8 part Hydroquinone 0.001 Part: Lionol Red 7BFG4412 (manufactured by Toyo Ink Co., Ltd.) 5 parts: methyl ethyl ketone 78 parts: The same procedures as in Example 1 were carried out, and the results shown in Table 1 were obtained.

Comparative Example 2 An image forming material was prepared in the same manner as in Comparative Example 1 except that no release layer was provided.

The transparent support side of the image forming material and the plate control wedge (PCW, manufactured by UGRA) are brought into close contact with each other, and subjected to imagewise exposure with a UV printer, HMW-201KB (manufactured by Oak Manufacturing Co., Ltd.). The material and the wedge were peeled off, immersed in the following developer at 30 ° C. for 30 seconds, and rubbed with a sponge to form an image on the release cushion layer.

<Developer> Potassium silicate (manufactured by Nippon Chemical Industry Co., Ltd.) 290 parts Perex NBL (anionic surfactant manufactured by Kao Corporation) 50 parts Water 5000 parts Next, first laminator 8b-700 special type ( Using an Taisei Laminator Co., Ltd.), the art paper and the image forming material are brought into close contact with each other, and the pressure is 4 kg / cm ² and the passing speed is 3
When the image was transferred by nip between the rollers under the conditions of 5 cm / min and a roller surface temperature of 80 ° C., a transferred image having good halftone dot reproducibility was obtained on art paper. The results are summarized in Table 1.

(Calculation of SP Value) The SP values in the above Examples and Comparative Examples were calculated as follows.

Toluene: 8.9 Water: 23.4 [Cushion layers of Examples 1 and 3] Toluene 65
%, Ethyl isobutyl ether (SP: 7.5) 35%
8.9 × 0.65 + 7.5 × 0.35 = 8.4 [in the case of the anchor layer of Example 4] 30% toluene, trichloroethane (SP: 9.6 ) Since the swellability in a 70% mixed solvent is optimal, 8.9 × 0.3 + 9.6 × 0.7 = 9.4 [In the case of the cushion layer of Example 4] Formamide (S
P: 19.2) Since the swellability in a mixed solvent of 81% and trichloroethane 19% is optimal, 19.2 × 0.81 + 9.6 × 0.19 = 17.4 [In the case of the cushion layer of Comparative Example 1] ] Hexane (SP:
Optimal swellability to 7.3)

[0120]

[Table 1]

From the results shown in Table 1, it can be seen that the transfer image forming material according to the present invention has good dot reproducibility.

[0122]

According to the present invention, a transferred image is obtained by performing exposure (back exposure) from the side opposite to the side having the photosensitive layer on the support to form a transferred image with improved halftone dot reproducibility of the transferred image forming material. A forming material and a method for manufacturing the same can be provided.

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Saburo Hiraoka 1st Sakuramachi, Hino-shi, Tokyo Konica Corporation

Claims (4)

[Claims] 1. A transfer method in which a transfer image forming material having a photosensitive layer provided on a transparent support is image-exposed from the transparent support side, and an image formed on the transparent support is transferred to a transfer medium to form an image. In the image forming material, a plurality of layers provided between the transparent support and the photosensitive layer, for example, an anchor layer, a cushion layer,
A transfer image forming material, wherein the refractive index of each of the release layers is smaller than the refractive index of the transparent support. 2. A transfer method in which a transfer image forming material provided with a photosensitive layer on a transparent support is image-exposed from the transparent support side, and an image formed on the transparent support is transferred to a transfer receiving medium to form an image. In the image forming material, a plurality of layers provided between the transparent support and the photosensitive layer, for example, an anchor layer, a cushion layer,
A transfer image forming material, wherein the absolute value of the difference between the refractive index of each of the release layer and the refractive index of the photosensitive layer is less than 0.07. 3. A coating solution in which a cushion layer and a photosensitive layer are provided in this order on a transparent support, and the absolute value of the difference between the solubility parameter of the cushioning layer and the coating solvent is less than 1.5. The transfer image forming material according to claim 1, wherein the cushion layer is formed by the following. 4. The method for producing a transfer image forming material according to claim 1, wherein a difference between solubility parameter values of a coating solvent of the anchor layer and the cushion layer and a solubility of a coating solvent of the cushion layer and the release layer. A method for producing a transfer image forming material, wherein the absolute value of the difference between the parameter values is 5 or more.