JP2646698B2 - Image forming material and image forming method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a colored image forming material used for forming a color proof and a transfer image forming method.

BACKGROUND OF THE INVENTION In the case of performing color printing, a halftone method is used in any of the lithographic method, the letter press method, and the gravure method, and a halftone, positive or negative plate subjected to color separation is required.

In order to save the labor and time of proof printing in which such actual printing is performed in advance, a color sheet for color proofing, that is, a color proof is generally known.

Various proposals have been made for color-proof image forming materials and image forming methods used for this purpose.
JP-A-56-212642, JP-A-59-121046, and JP-A-61-16, in which the overlay method and the surprint method are known
7938. The overlay method is a method of forming each color image on a transparent support, then simply superimposing them and placing them on a white table to obtain a multi-color image, but sufficient in terms of handling and color reproducibility It cannot be said that the printed matter is close to the printed matter. A surprint type color proof has been proposed to improve this. Various proposals have been made for the layer structure and image forming method of the color proof using the surprint method. This color proof transfer system includes, for example, (1)
No. 160452, Sho 60-263936 and Sho 59-136736, a method of transferring a photosensitive layer containing a coloring material to a support and repeating exposure and development to form a colored image. 11
3436, a method of laminating the photosensitive adhesive layer described in U.S. Pat.
(3) JP-A-63-74052, JP-A-63-70250, JP-A-61-670
A method of sequentially transferring a monochromatic image formed on a color sheet described in 188537 to an image receiving layer and retransferring the same to a transfer material is known.

However, each of the above methods has a complicated process and requires much labor. In particular, the transferred colored image layer is glossy not only on the surface of the transferred image but also on the non-image portion because, for example, in the method (3), the colored image layer is embedded in the image receiving layer. Had a texture or image quality different from that of the printed matter. Therefore, in order to make the quality of the actual printed matter as close as possible, it is necessary to perform a matting process on the surface of the transferred image, and even if the process is performed, a texture different from that of the actual printed matter is given.

Therefore, the present inventors have proposed a method of forming a transferred image which can form a color proof having a texture similar to that of an actual printed matter as well as a simple processing process. It is an object of the present invention to provide a method of transferring a relief image alone and repeating the above process to obtain a color relief image having exactly the same image style as a printed matter on an image receiving material.

[Means for solving the problem]

An object of the present invention is to provide an image forming material comprising a colored layer and a photosensitive layer sequentially laminated on a transparent support, wherein the photosensitive layer contains an alkali-soluble thermoplastic resin. The image forming material was exposed to an image with (a) actinic rays, and (b) the exposed image forming material was developed with an aqueous alkali solution to form an image area, and (c) formed on a transparent support. The image forming method can be achieved by bringing the image portion side into close contact with the material to be transferred, transferring the image portion, and (d) peeling the transparent support from the material to be transferred.

 Hereinafter, the present invention will be described.

As the transparent support used in the present invention, a biaxially stretched polyethylene terephthalate film is preferable in view of dimensional stability against heat, but an acetate film, a polyvinyl chloride film, a polystyrene film, a polypropylene film, and a polyethylene film are also used. obtain.
Further, these supports may be used as they are, but in order to improve the transferability of an image after image formation, a silicone resin,
Release treatment with a suitable substance such as a fluororesin or a fluorosurfactant, or a partially esterified product of alcohol-soluble polyamide, alcohol-soluble nylon, styrene / maleic anhydride copolymer or polyvinyl alcohol having a thickness of about 1 μm Etc. may be provided.

The release treatment or the undercoat layer described above adheres to the transparent support from the viewpoint of transferring only the relief image,
A material which does not peel off from the support at the time of peeling or a material which is releasably etched during the release treatment and the undercoat layer during the development treatment can be used.

The coloring layer used in the present invention is a binder,
A coloring agent.

The polymer compound that can be used as a binder for the colored layer can be basically used as long as it is solvent-soluble and has a good film-forming property. It is preferable to use water or an alkali-soluble polymer compound.

In addition, since these polymer compounds undergo a thermal transfer process after exposure and development, those having as high a thermal softening point as possible to prevent thermal deformation of the colored portion, that is, image blurring, are convenient. C. to 200.degree. C., and most preferably a polymer compound at 80.degree. C. to 170.degree. Certain polymer compounds decompose without showing a clear softening point, but they can also be used basically.

Examples of such high molecular compounds include those having a phenolic hydroxyl group, such as polycondensation resins of phenols and aldehydes or ketones, those having a phenolic hydroxyl group introduced into an ethylenic double bond, and acrylic acid monomers or acrylic acid derivatives. Examples include a polymer compound obtained by copolymerization with a monomer.

More specifically, phenol, o-cresol, m
-Cresol, p-cresol, 3,5-xylenol,
Polycondensation of monohydric phenols such as carvacrol, thymol, p-alkyl-substituted phenols, dihydric phenols such as catechol, resorcin and hydroquinone, and trihydric phenols such as pyrogallol and phloroglucin with formaldehyde and ketone in the presence of an acid catalyst Things are given. Further, as an example of the acrylic polymer compound, a polymer containing a structural unit derived from a monomer represented by the formula [1] in its structural unit can be used.

(Wherein, R ₁ and R ₂ are each a hydrogen atom, an alkyl group or a carboxylic acid group, R ₃ is a hydrogen atom, a halogen atom or an alkyl group, R ₄ is a hydrogen atom, an alkyl group, a phenol group or an aralkyl group, and X is A divalent organic group linked to a nitrogen atom and an aromatic ring carbon atom, n represents 0 or 1, and Y represents a phenylene group which may have a substituent or a naphthylene group which may have a substituent.) Other monomers that can be copolymerized with the monomers include acrylic acids such as acrylic acid and methacrylic acid, for example, itaconic acid, maleic acid, dicarboxylic acids having an ethylenically unsaturated bond such as maleic anhydride,
For example, methyl (meth) acrylate, (in the present specification, acrylic and methacrylic compounds are collectively expressed as (meth) acryl ...).
N-butyl (meth) acrylate, isobutyl (meth) acrylate, dodecyl (meth) acrylate, 2-chloroethyl (meth) acrylate, phenyl (meth) acrylate, methyl α-chloroacrylate, ethyl ethacrylate, etc. Esters of α-methylene aliphatic monocarboxylic acids of
For example, nitriles such as acrylonitrile and methacrylonitrile, for example, amides such as acrylamide, for example, acrylanilide, p-chloroacrylanilide, m-
Anilides such as nitroacrylanilide and m-methoxyacrylanilide, for example, vinyl esters such as vinyl acetate, vinyl propionate, vinyl benzoate and vinyl butyrate, 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 such as 1-
Ethylene derivatives such as methyl-1-methoxyethylene, 1,1-dimethoxyethylene, 1,2-dimethoxyethylene, 1,1-dimethoxycarbonylethylene, 1-methyl-1-nitroethylene, for example, N-vinylpyrrole, N Vinyl monomers such as N-vinyl compounds such as -vinylcarbazole, N-vinylindole, N-vinylpyrrolidene, and N-vinylpyrrolidone;

In addition, a (co) polymer of hydroxystyrene can also be used. Examples of such a polymer compound include Resin M (manufactured by Maruzen Oil Co., Ltd.). From the viewpoint of alkali solubility, it is not necessary to have a phenolic hydroxyl group and it is derived from a copolymer containing a styrene monomer or a monomer having an ethylenically unsaturated bond without the phenolic hydroxyl group. Copolymers can also be used. Such monomers include acrylic acid,
Acrylic acids such as methacrylic acid and the like, for example, dicarboxylic acids having an ethylenically unsaturated bond such as itaconic acid, maleic acid and maleic anhydride, and the like can be mentioned. Further, those obtained by converting these dicarboxylic acids into half esters can also be used.

Examples of the water-soluble polymer compound include polyvinyl alcohol, cellulose having various degrees of saponification, or modified products thereof, polyvinylpyrrolidone, casein, gelatin, polyacrylamide, and polyamide poly (meth).
Acrylic acid and the like can be used, and these can be used alone or in a mixing ratio such that an image is not crushed.

In addition, these polymer compounds are mixed with the above-mentioned polymer compound having a phenolic hydroxyl group at pH 7 to p at an appropriate mixing ratio.
It can be dissolved or dissolved in an alkaline aqueous solution of H11.

The thickness of the colored layer is determined in consideration of the stability of the image and the developability, and is preferably 0.2 to 2 μm from the viewpoint of preventing the collapse of the image, and more preferably from the viewpoint of the stability of the developability. For example, those having a thickness of 0.5 to 2 μm are most preferable.

Dyes and pigments can be used as the colorant used in the present invention. Particularly when used for color proofing, pigments and dyes of the same color as the ordinary colors required therefor, i.e., yellow, magenta, cyan, and black, are required.
White pigments and fluorescent pigments are also used. The following examples are just a few of the many pigments and dyes known in the art.
(CI means color index) Victoria Pure Blue (CI 42595) Auramine O (CI 41000) Katilon Brilliant Flavin (CI Basic 13) Rhodamine GGCP (CI 45160) Rhodamine B (CI 45170) Safranin OK 70: 100 (CI 50240) Erioglaucine X (CI 42080) Fast Black HB (CI 26150) No.1201 Lionol Yellow (CI 21090) Lionol Yellow GRO (CI 21090) Shimla First Yellow 8GF (CI 21105) Benzidine Yellow 4T-564D (CI 21095) Shimla Fast Red 4015 (CI 12355) Lionol Red 7B4401 (CI 15830) Fast Gamble-TGR-L (CI 74160) Lionol Blue SM (CI 26150) Mitsubishi Carbon Black MA-100 Mitsubishi Carbon Black , ♯50 The content ratio of the colorant is determined by considering the target optical density and the removability of the developer. It can be determined by methods known to. For example, the content of a dye is suitably 5% to 75% by weight, and the content of a pigment is suitably 5% to 90% by weight.

The photosensitive layer used in the present invention contains a photosensitive member and an alkali-soluble thermoplastic resin. Examples of the photoreceptor include o-naphthoquinonediazide-4-sulfonic acid chloride and o-naphthoquinonediazide-5-sulfonic acid chloride.
-Derivatives of naphthoquinonediazidesulfonic acid halogenides are available. Specific examples of such photoreceptors include condensates of benzophenone with o-naphthoquinonediazide-4 and 5-sulfonic acid chloride ([2] and [3]
Expression), and Those obtained by introducing the above-mentioned o-naphthoquinonediazide into a phenol novolak resin or a pyrogallol acetone resin (formula [4]) are exemplified.

The amount of the photoreceptor added is preferably at least 4.5% by weight of the photosensitive layer composition and preferably 10% by weight of the o-naphthoxin diazide derivative in consideration of the sensitivity of the image forming material and the development suitability to a developer. From40
Weight percent loadings are most preferred.

The photosensitive layer of the present invention has a function as a resist layer for forming an image by exposure and development, and a function as thermal adhesion to a material to be transferred. In particular, the thermal adhesiveness to the material to be transferred has a very significant effect on the final image obtained, and if this performance is incomplete, white dropout or peeling of the image will occur.

The thermal adhesiveness, the thermal softening point of the alkali-soluble thermoplastic resin used in the photosensitive layer has contributed greatly, and as a result of earnest examination, the thermal softening point of such a thermoplastic resin is 40 ° C ~ 12.
Those having a temperature in the range of 0 ° C. are preferred from the viewpoint of image transferability, and those having a thermal softening point of the thermoplastic resin of 40 ° C. to 100 ° C. are more preferable in view of the thermal dimensional stability of the material to be transferred. In particular, those in the range of 50 ° C to 80 ° C are most preferable.

The thermoplastic resin is weakly alkaline water, usually at pH 8
It is necessary to dissolve in alkaline water of pH 11 to provide a colored image. Examples of such a thermoplastic resin include a phenol novolak resin and an alkaline polymer compound.

As the phenol novolak resin, for example, a polycondensate of phenol with formaldehyde or ketone and having a weight average molecular weight of about 500 to 2,000 can be used. Further, as the acrylic polymer compound, a copolymer with a monomer having an ethylenically unsaturated bond as the monomer having the structure of the formula [1] can be used.

The mol% of the monomer represented by the formula [1] in such a copolymer is selected from the range of 3 mol% to 30 mol% from the viewpoint of thermal adhesiveness, that is, its softening point, and furthermore, the weak pH of 8 to 11 is selected. More preferably, 5 to carry out development under alkaline conditions.
It is selected from the range of mol% to 20 mol%. As the other components in the copolymer, a monomer having an ethylenically unsaturated bond can be basically used, but it must be selected so that the thermal softening point is in a suitable range. Such monomers include methyl (meth) acrylate, ethyl (meth) acrylate,
N-butyl (meth) acrylate, i (meth) acrylate
Α-methylene aliphatic monocarboxylic esters such as 2-ethylhexyl butyl (meth) acrylate and dodecyl (meth) acrylate; nitriles such as acrylonitrile and methacrylonitrile; and acrylic acids such as (meth) acrylic acid And dicarboxylic acids having an ethylenically unsaturated bond such as itaconic acid, maleic acid and maleic anhydride. These monomers can be introduced at an arbitrary ratio as long as the thermal softening point of the copolymer is kept in a suitable range, but the preferred range is that of α-methylene aliphatic monocarboxylic acid ester. The mol% in the polymer compound is 40 mol% or less from the viewpoint of maintaining the thermal softening point.
90 mol%, 5 mol% to 30 mol% in terms of improvement of coating film strength, and 0.5 to 10 mol% in terms of acrylic acid and dicarboxylic acid having an ethylenically unsaturated bond in view of fine control of developability. Each is selected from the range of mol%.

Examples of such high molecular compounds include those having a combination of constituent units such as [5] and [6] and an approximate composition ratio. The molecular weight of the polymer compound is 2000 to 20,000 as a weight average molecular weight from the viewpoint of softening point and coating film strength.
00 is preferred.

The above thermoplastic resins can be used alone or as a mixture with other polymer compounds or monomers to such an extent that the thermal softening point and the developing property are not impaired.

The smaller the thickness of the photosensitive layer, the higher the resolution and the thicker the photosensitive layer, the lower the resolution. On the other hand, the larger the thickness, the more stable the peeling can be performed when the image is thermally transferred. Therefore, the thickness of the photosensitive layer must be in a region where transfer is stable while maintaining a certain level of resolution. The range that satisfies these conditions is preferably from 0.5 μm to 20 μm, and most preferably from 1 μm to 15 μm in terms of coating film strength.

In order to produce the image forming material according to the present invention, each of the above-mentioned colored layer and photosensitive layer forming materials may be dissolved in an appropriate solvent and applied so as to be sequentially laminated on the above-mentioned support.

In addition, it is also possible to provide a layer made of an alkali-soluble polymer composition as an intermediate layer on these layers to improve the adhesiveness of both layers.

The coating method may be any method conventionally known as a film coating technique such as roll coating or curtain coating, and is not particularly limited as long as a uniform coating film without pinning holes and scratches can be obtained.

Examples of the solvent include water, methanol, ethanol, acetone, ethyl acetate, methyl cellosolve, ethyl cellosolve, dioxane, methyl ethyl ketone, cyclohexanone, diethylene glycol monomethyl ether, γ-butyrolactone, tetrahydrofuran, methylene chloride, ethylene chloride, dimethyl sulfoxide, and dimethylformamide. These can be used alone or in combination of two or more.

An operation of forming an image using the image forming material according to the present invention manufactured as described above will be described with reference to FIG.

1 (a) to 1 (d), 1 is a transparent support, 2 is a colored layer, 3 is a photosensitive layer, 4 is an actinic ray, 5 is a positive film original, 6 is a material to be transferred, 7 is a heating and pressure roll. Respectively.

The image-forming material of the present invention comprises a transparent support 1 as shown in (a).
A colored layer 2 and a photosensitive layer 3 are sequentially laminated. When an image is formed, first, as shown in (b), an actinic ray 4 is irradiated through a positive film 5 to perform image exposure.

Various light sources such as an ultra-high pressure mercury lamp, a tungsten lamp, a mercury lamp, a xenon lamp, a fluorescent lamp, and a CRT light source laser light source are used for image exposure.

The image-forming material thus image-exposed has a pH of 8 to p.
Since the alkaline water of H11 dissolves in the non-image part and does not dissolve the image part, an image is formed with this developer as shown in FIG.

Next, the obtained colored image is transferred onto a transfer receiving machine such as white paper. Specifically, the colored image is superimposed on the white paper and passed through a laminator under heat and pressure using a roller or the like as shown in FIG. 1 (d). The colored image adheres to the white paper via the adhesive layer and is transferred by heating and pressing during the passage.

The transfer material and the film on which the image is formed may be heated and pressed while being placed on a rigid support during lamination. When the image is transferred, the transfer is completed by releasing the transparent support 1 as shown in FIG. 1 (d). Therefore, it will be understood that the adhesive strength between the transparent support 1 and the colored layer 2 should be smaller than the adhesive strength of the photosensitive layer 3 to the material 6 to be transferred.

Exposure development and development
Repeat the transfer for the required number of colors.

In the obtained multicolor proof sheet, only the colored image was transferred onto the white paper, and was remarkably close to a printed matter.

[Examples] Examples will be given below, but the present invention is not limited thereto.

Example 1 [Synthesis of polymer solution-1] In a 14-neck flask, 74.07 g of methyl methacrylate, 5.28 g of acrylonitrile, 13.78 g of methacrylic acid, 2-2 '
-1.07 g of azobisisobutyronitrile was charged and reacted while refluxing for 5 hours using 194 g of ethyl alcohol as a solvent, and 200 g of methyl cellosolve was added to stop the reaction.
The solvent was replaced with 100 mmHg for 2 hours to obtain a 40% methylcellosolve solution of a polymer compound having a composition having structural units based on methyl methacrylate, acronitrile and methacrylic acid in proportions corresponding to the charged amounts. The molecular weight of this polymer compound was about 20,000 as measured using gel permutation chromatography (hereinafter abbreviated as GPC).

[Synthesis of Polymer Solution-2] 13.28 g of p-hydroxyphenyl methacrylate, 2.65 g of acrylonitrile, 30.53 g of methyl acrylate, 1.44 g of acrylic acid, 2-2'azobisisobutyronitrile 1.65 g and lauryl mercaptan 4.04 g were charged, and refluxed for 6 hours using 200 g of ethyl alcohol as a solvent to carry out a reaction. After 200 g of methyl cellosolve was added thereto, the reaction was stopped and the solvent was replaced at 100 mmHg for 3 hours to obtain a 40% methyl cellosolve solution of a polymer compound having a structural unit corresponding to the charged amount of each monomer. The molecular weight of the polymer compound was about 5,0 according to GPC measurement.
00.

The polymer solutions-1 and 2 thus obtained were prepared to have the following compositions.

Solution-A Polymer solution-1 10 g Methyl cellosolve 28 g Pigment (phthalocyanine blue 4927 manufactured by Dainichi Seika Co., Ltd.) 1 g Solution-B Polymer solution-2 10 g Methyl cellosolve 18 g Photosensitive material (NT-3.0 manufactured by Toyo Gosei Co., Ltd.) 1 g of this solution-A was applied to a biaxially stretched polyethylene terephthalate film (PET; 75 μm) using an applicator and dried at 80 ° C. for 1 minute to obtain a colored layer having a thickness of 1 μm. Further apply Solution-B with an applicator.
After drying at 80 ° C. for 1 minute, a photosensitive layer having a thickness of 5 μm was provided. After aging this image forming material at 55 ° C for 12 hours, 1KW
Exposure was performed for 30 seconds from the side of the support using a metal halide lamp, and development was performed for 60 seconds with a Na ₂ CO ₃ solution adjusted to pH-9 to obtain a good positive image. The positive image surface obtained in this way is applied to art paper (OK special art: manufactured by Oji Paper Co., Ltd.)
And put it on an aluminum plate for 5k at 80 ° C
Transfer was performed at a pressure of g / cm ² , and when the PET support was peeled off, a good positive image was obtained on the art paper, and there was no image collapse flow.

Example 2 An experiment was performed by changing the solution-A in Example 1 to the following and using the other conditions as the same. As a result, it was possible to obtain a good transfer image with no image collapse, no flow, and no image peeling. Was done.

Solution-C phenol (metacresol novolak resin (molecular weight 3,
000) Sumitomo Durez Co., Ltd.) 4 g Methyl cellosolve 34 g Pigment (phthalocyanine blue 4927: manufactured by Dainichisei Co., Ltd.) 1 g Example 3 The following polymer solution was prepared as solution-D.

Polyvinyl alcohol GH-14 (manufactured by Nippon Gosei Co., Ltd.) 4 g Demineralized water 28 g Pigment (phthalocyanine-4927) 1 g This was used in place of solution-A in Example 1, and the other was applied on polyethylene terephthalate in the same manner. did. Next, when exposure and development were carried out in the same manner as in Example 1, a good positive image was obtained on the film, and a good transferred image was obtained by transferring this onto art paper.

Example 4 The following polymer solution was prepared from Solution-E.

Resin M (manufactured by Maruzen Petroleum Co., Ltd.) 4 g Methyl cellosolve 28 g Pigment 1 g This was applied in place of solution-A in Example 1, exposed and developed and transferred as a result. A transfer image was obtained.

Comparative Example 1 Solution F having the following composition using Polymer Solution-2
Was prepared.

Polymer solution-2 10 g Methyl cellosolve 24 g Photosensitive material (NT-3.0 manufactured by Toyo Gosei Co., Ltd.) 1.0 g Pigment (phthalocyanine-4927 manufactured by Dainichi Seika Co., Ltd.) 1.0 g Biaxially stretched polyethylene Coat with terephthalate (75μm) using a wire bar,
After drying for 5 minutes, a coating film of 5 μm was obtained.

This was exposed to light through a polyethylene terephthalate film of a support with a 1KW metal halide lamp to obtain a pH of 9
When development was performed with a Na ₂ CO ₃ solution adjusted to, a positive image was obtained on the film. When this was transferred to art paper (OK special art: manufactured by Oji Paper Co., Ltd.) at a paper surface temperature of 80 ° C. and 5 kg / cm ^{2, the} transfer was completely performed, but the image collapsed.
A flow occurred and the positive film original was not reproduced.

Comparative Example 2 Phenol novolak resin (MW = 1,000, softening point 53-6
(0 ° C.) to prepare the next solution G.

Phenol novolak resin MW = 1000, softening point 53-60 ℃
(Manufactured by Sumitomo Durez Co., Ltd.) 4 g Methyl cellosolve 30 g Photosensitive material (NT-3.0, manufactured by Toyo Gosei Co., Ltd.) 1 g Pigment (Phthalocyanine Lou 4927 manufactured by Dainichi Seika Co., Ltd.) 1 g Biaxially stretched polyethylene terephthalate (75 μm) and dried at 80 ° C. for 1 minute to obtain a 5 μm coating film. This was processed in the same manner as in Comparative Example 1 and transferred to art paper. As a result, an image was crushed or flowed, and a transfer image reproducing a positive film original was not obtained.

(Effect of the Invention) By using the image transfer material of the present invention, it is possible to develop well with weak alkaline water, and furthermore, it is possible to easily transfer only the image portion to be formed on the transfer material, and to obtain a colored image closer to a printed matter. Obtainable.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram for explaining a method of forming an image using the image transfer material of the present invention. DESCRIPTION OF SYMBOLS 1 ... Transparent support 2 ... Colored layer 3 ... Photosensitive layer 4 ... Actinic ray 5 ... Positive film original 6 ... Transferred material 7 ... Heating / pressing roll

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tetsuya Masuda 1000 Kamoshita-cho, Midori-ku, Yokohama-shi, Kanagawa Prefecture Inside the Mitsubishi Chemical Research Institute (72) Inventor Nobumasa left 1 Sakura-cho, Hino-shi, Tokyo Konica Corporation Inside the company (72) Inventor Manabu Watanabe 1 in Sakura-cho, Hino-shi, Tokyo Inside Konica Corporation (72) Inventor Kunio Shimizu 1 in Sakura-machi, Hino-shi, Tokyo Inside Konica Corporation (56) References JP Akira 59-97140 (JP, A) JP-A-63-82411 (JP, A) JP-A-63-206747 (JP, A) JP-A-63-89864 (JP, A)

Claims (1)

(57) [Claims] 1. An image forming material comprising a transparent support and a colored layer and a photosensitive layer sequentially laminated on the transparent support, wherein the photosensitive layer comprises an image forming material containing an alkali-soluble thermoplastic resin, And (b) developing the exposed image forming material with an aqueous alkali solution to form an image area, and (c) forming the image area side formed on the transparent support on the material to be transferred. After that, only the image portion is transferred, and (d)
A method for forming a color proof image, comprising peeling the transparent support from a material to be transferred.