JPH07199460A - Image forming material, image forming body and image forming method - Google Patents

Abstract

(57) [Summary] [Purpose] A simple proof with a texture and quality level close to that of proof printing is easily and inexpensively produced on printing paper. [Structure] A photosensitive layer containing a photopolymerizable compound and a photopolymerization initiator, and a colored layer containing a dye or pigment and an organic polymer binder having no photopolymerizability are laminated. Image forming material. [Effect] Since the adhesive force of the photosensitive layer and the adhesive force of the colored layer of the image forming material are used, an intermediate image receptor and a specially treated image receiving paper are not required, and a good simple proof can be easily provided on the printing paper. It can be created at low cost.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to image formation by superposition of a single color or multiple colors used for simple proof printing for printing (hereinafter referred to as a simple proof), and more particularly to the adhesive force of a photosensitive layer. The image formation is performed by exposure to the action of the internal cohesive force or the interfacial tension.

[0002]

2. Description of the Related Art The above-mentioned simple proof is mainly used in a process of producing a printed matter from an original such as a color film on which an object is photographed. For example, it is often used to confirm the finish of the color separation film from a color scanner, which is a device for performing color separation of an original, or to check the state of the color separation film that exposes a printing plate. Also,
It has begun to be applied partially as an alternative to a printing plate that has been exposed and developed and printed by a pressure type flatbed proofing machine.

The simple proof is classified into an overlay method and a surprint method according to a method of superposing multiple colors. The overlay method is a method in which color-separated two-color or three-color colored bodies are viewed in an overlapping manner as necessary, and has an advantage that a multicolor printed matter can be inspected very easily.
However, since each support is observed between the colored bodies of each color, the obtained simple proof is different from printed matter in terms of reflection gloss and reproduction of halftone dots, and a texture close to that of printed matter is obtained. It has the drawback of being difficult. An example of this method is described in US Pat. No. 3,136,637.
The surprint method is a method in which several colored layers of different colors are superposed on a single support, and a photosensitive layer or toner colored in each color is transparent or opaque depending on the color-separated image. By sequentially forming on the support of
An image similar to a printed matter can be obtained. In this method, since the support does not enter between the colored layers, the reproduction of the halftone dot shape is good and an image closer to the printed matter can be obtained.
Since the thickness of the colored layer is thicker than that of the printed matter, it has a drawback that gloss tends to be high. Examples of this method include US Pat. Nos. 3,671,236 and 3,136,637.
Those described in Japanese Patent No.

Further, an image forming method applying a photopolymerization and thermal transfer technique is also known. When the photopolymerizable photosensitive layer on the support is exposed with a color-separated image and then pressured and heated together with the image receiving paper, an image in which the unexposed portion is transferred is obtained. By repeating this process for each color,
You can create an image similar to a printed matter. At this time, if the photosensitive layer is colored in the same color as the color-separated image,
The final proof may be created by repeating the exposure / transfer process as it is. However, when applying an uncolored photosensitive layer, using the adhesive force held by the unexposed area,
An image of the same color as the color-separated image is visualized by appropriately attaching the colored toner. At this time, the colored layer forming the image is formed of an aggregate of toners of respective colors.

However, in both cases, the film thickness of the formed image is thicker than that of the printed matter, so that the texture of the finished product is likely to be different from that of the printed matter. Further, since the work time of lamination, exposure, and development of each color tends to be long, the productivity tends to be low. These methods are described, for example, in U.S. Pat. Nos. 3060023, 3060024, and 306.
No. 0025, No. 3481736, No. 3606072
No. 4 publication.

A method for producing a simple proof in which the disadvantageous properties of the surprint method and the overlay method are improved is disclosed in JP-A-59 / 59.
-97140. The feature of this is that (a) it is possible to expose the separated images of each color at the same time, and (b) the colored image is embedded in the photopolymerizable adhesive layer at the time of transfer to the image receiving paper, (C) The photopolymerizable adhesive layer can be transferred to white paper or the like.
Therefore, a simple proof that more closely resembles a printed matter can be obtained relatively easily than the above method. However, it has the drawback that it is necessary to use an alkaline substance for the development work during the process, and the orientation of the finally obtained image is opposite to that of the printed matter.

It is not necessary to use an intermediate image receiver or an image receiving paper that has been specially processed, and the same paper as printed matter can be used.
Japanese Patent Laid-Open No. 63-147154 discloses a method for easily producing a simple proof having the same orientation as a printed matter. This method uses a photosensitive sheet having a structure in which a colored photosensitive layer is provided between a cover sheet and a support. After exposing the color-separated image, the cover sheet is peeled off, and an image receiving paper such as a blank sheet is received. A simple proof is manufactured by repeating a series of steps of peeling the two while performing thermocompression bonding for each color.

This method utilizes the difference in the adhesive force between the exposed and unexposed portions of the photosensitive layer and the difference in the adhesive force at the interface between the layers to cause the photosensitive layer to cohesively break between the support and the image receiving paper. As a result, a colored image is formed on the image receiving paper. The feature of this system is that it is possible to reproduce a fine image from the balance of the internal cohesive force and the adhesive force in the photosensitive layer, and it does not require any special development process and is thermocompression bonded to the image receiving paper after image exposure. The proof can be made easily, and the pigment in the photosensitive layer can be similar to the proofing ink, so the color tone is also close, and the film pressure of the printing ink and the thickness of the photosensitive layer are close and the texture is similar. There are things such as being present.

However, in this system, the photosensitive layer contains a photopolymerizable compound and a radical polymerization initiator, and in order to avoid oxygen inhibition during the photopolymerization reaction, the photosensitive layer is shielded from the air during exposure. A cover sheet is required. Therefore, it is inevitable that the cost is increased both from the material side of the cover sheet and from the step of laminating the cover sheet on the photosensitive layer.

[0010]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned drawbacks of the prior art, and its object is to achieve a texture and quality level close to those of proof printing. The simple proof of (3) can be easily formed on a printing paper, and an image can be formed at low cost.

[0011]

The image forming material of the present invention comprises a photosensitive layer containing a photopolymerizable compound and a photopolymerization initiator, an organic polymer binder which is not photopolymerizable with a dye or pigment. And a colored layer containing a.

The image-forming body of the present invention comprises a support,
A photosensitive layer containing a photopolymerizable compound and a photopolymerization initiator,
It is characterized in that a dye or a pigment and a colored layer containing an organic polymer binder having no photopolymerizability are sequentially laminated.

The image forming method of the present invention comprises:
A photosensitive layer containing a photopolymerizable compound and a photopolymerization initiator,
A dye or pigment and a colored layer containing an organic polymer binder having no photopolymerizability are laminated thereon to form an image-forming body, and the image-forming body is subjected to imagewise exposure to form a photosensitive layer. After making a difference in the adhesiveness between the exposed part and the non-exposed part, the image receiving paper is superposed on the colored layer side of the image forming body and pressed,
The image forming material comprising a photosensitive layer and a colored layer is peeled off and transferred onto an image receiving paper.

In the image-forming material of the present invention, it is desirable that the photopolymerization initiator has sensitivity to ultraviolet rays.

In the image forming material of the present invention, the photopolymerization initiator is benzophenone, 4,4-bis (diethylamino) benzophenone, 4-methoxy-4-dimethylaminobenzophenone, 2-ethylanthraquinone, phenanthraquinone. At least one polymerization initiator selected from the group consisting of compounds such as benzoin, benzoin methyl ether, and benzoin phenyl ether is preferable.

Further, in the image forming method of the present invention, the image forming body and the image receiving paper are subjected to heat treatment together with pressurization, if necessary.

In the image forming method of the present invention, it is preferable to use ultraviolet rays for image exposure.

The present invention will be described in detail below. The image forming method of the present invention differs from the image forming method of Japanese Patent Laid-Open No. 63-147154 described above in that there is a difference in the adhesive force between the support and the interlayer interfaces between the exposed and unexposed portions of the photosensitive layer. Using the balance between the adhesive strength of the image-receiving paper, including plain paper, and the colored layer during thermocompression bonding, and the breaking force of the colored layer, the photosensitive layer and the colored layer in the exposed or unexposed area are transferred to the image-receiving paper. It peels and transfers. This photosensitive layer contains a photopolymerization initiator that causes the photopolymerizable compound to initiate polymerization upon exposure to ultraviolet light. At this time, the type of the photopolymerizable compound constituting the photosensitive layer, the combination with an organic polymer binder having no photopolymerization, the type and mixing ratio of the organic polymer compound and the dye or pigment of the coloring layer, Furthermore, depending on the type of support and the type of image receiving paper,
It is necessary to select and use an appropriate configuration because the balance of the forces generated at each part during image formation changes.

Various materials can be used as the support, and acetate film, polyvinyl chloride film, polyethylene film, polypropylene film and the like can be used, but in terms of dimensional stability against heat and water, workability, etc. Therefore, biaxially stretched polyethylene terephthalate is more desirable. Further, these supports may be used as they are, but in order to control the adhesiveness with the photosensitive layer, release treatment with an appropriate oil repellent substance such as silicone resin or fluororesin, corona discharge or plasma treatment Surface treatment such as easy adhesion treatment may be performed.

Further, in order to reduce the blocking between the colored layer and the support, which tends to occur when the film is stored in a rolled state or a stacked sheet state without using a cover film, a silicone resin is provided on the surface of the exposed side. A mold release treatment may be performed using an appropriate oil repellent substance such as or fluororesin.

As the dyes or pigments used in the image forming material of the present invention, conventionally known dyes can be used, but generally those having four hues of yellow, magenta, cyan and black are required. is there. In addition to these, metal powder, white pigment, fluorescent pigment, etc. are also used supplementarily. In addition to commercially available products, these are well-known items described in various documents (eg, "Handbook of Dyes" edited by the Organic Synthetic Science Association of Japan, published in 1970, "Handbook of Latest Pigments" edited by Japan Pigment Technology Association, published in 1976). Can be used. As a partial example,
Examples thereof include azo-based, phthalocyanine-based, quinacridone-based, anthraquinone-based, indigo-based, methine-based organic pigments or dyes, and inorganic pigments.

These dyes and pigments may be mixed or contained in the colored layer by a suitable known means. Further, in order to appropriately matte the photosensitive layer and the colored layer, it is also effective to mix powders, fillers, and the like, or to perform treatment as needed to satisfactorily control the texture of the obtained image.

The photopolymerizable compound used in the present invention is a free-radical addition-polymerizable or crosslinkable ethylenically unsaturated compound having one or more ethylenically unsaturated groups such as vinyl or allyl groups. Monomers, oligomers and polymers having an ethylenically unsaturated group at the terminal or side chain can be used. These include acrylic acid and its salts, acrylic acid esters, acrylamides, methacrylic acid and its salts, methacrylic acid esters, methacrylamides, maleic anhydride, maleic acid esters, itaconic acid esters, styrenes,
Examples include vinyl ethers, vinyl esters, N-vinyl heterocycles, allyl ethers, allyl esters and their derivatives.

Specific examples include (meth) acrylic acid, methyl (meth) acrylate, butyl (meth) acrylate, cyclohexane (meth) acrylate, dimethylaminoethyl (meth) acrylate, benzyl (meth) acrylate, carbitol (meth). ) Acrylate, 2-
Ethylhexyl (meth) acrylate, lauryl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, glycidyl (meth) acrylate, (meth) acrylamide, N-methylol (meth) acrylamide, styrene , Acrylonitrile, N-vinylpyrrolidone, ethylene glycol diacrylate, diethylene glycol diacrylate, triethylene glycol diacrylate, polyethylene glycol di (meth) acrylate, butylene glycol di (meth) acrylate, neopentyl glycol di (meth) acrylate, 1, 4-
Butanediol diacrylate, pentaerythritol diacrylate, pentaerythritol triacrylate,
Low molecular weight compounds such as trimethylolpropane triacrylate, dipentaerythritol hexaacrylate, (meth) acrylate of alkylene oxide adduct of phenol, (meth) acrylate at the end of epoxy resin, (meth) acrylate at the end of polyester Examples of the high molecular weight compound include a polymer in which is bonded, an acrylate modified product of petroleum resin, and unsaturated polyester. These polymerizable compounds may be used alone or in combination of two or more kinds.

It is more preferable that the polymerization initiator used in the present invention has little light absorption in the visible light portion, and examples thereof include benzophenone, 4,4-bis (diethylamino) benzophenone and 4-methoxy-4-dimethylaminobenzophenone. Well-known polymerization initiators such as 2-ethylanthraquinone, phenanthraquinone, benzoin, benzoin methyl ether, and benzoin phenyl ether can be used alone or in combination of two or more.

In addition to the polymerization initiator, a thermal polymerization inhibitor may be mixed, and p-methoxyphenol, hydroquinone, t-butylcatechol, pyrogallol, pyridine,
Aryl phosphate etc. are mentioned.

The organic polymer binder having no photopolymerizable property is
It is mixed in the colored layer and used as a dispersion medium for the dye or pigment, but it may be mixed in the photosensitive layer and used for adjusting the adhesive force. The latter needs to have good compatibility with the photopolymerizable compound. Generally, thermoplastic resins such as polyvinyl chloride, poly (meth) acrylic acid, poly (meth) acrylic acid ester, polyvinyl ether, polyvinyl acetal, urethane resin, epoxy resin, polyamide, polyester, vinylidene chloride-acrylonitrile copolymer , Vinylidene chloride-methacrylate copolymer, vinylidene chloride-vinyl acetate copolymer, cellulose derivative, polyolefin, synthetic rubber such as butadiene-acrylonitrile copolymer, diallyl phthalate resin and the like.

As the organic polymer binder in the colored layer, a pressure-sensitive / heat-sensitive adhesive may be used alone or in combination, and a rubber-based, acrylic-based or silicone-based adhesive may be used. These are composed of an elastic body, an adhesion-imparting agent, a plasticizer, a filler, and an auxiliary agent such as an antiaging agent. Specifically, as the elastic body, natural rubber, synthetic isoprene, recycled rubber, SBR rubber, polyisoprene are used. Rubber, polyacrylic acid ester or its derivative, styrene-isoprene-styrene rubber, silicone rubber, silicone resin, etc., and the adhesion-imparting agent is rosin-based and rosin-derivatives, folyterpene resin, chroman-indene resin, petroleum-based resin, terpene. Examples of the plasticizer include a phenol resin and liquid polybutene, mineral oil, lanolin, liquid polyisoprene, liquid polyacrylate and the like. In addition, antioxidants such as antioxidants and fillers such as inorganic pigments are added as necessary.

Further, a wax may be mixed in the coloring layer, for example, animal, plant, mineral and petroleum natural waxes, synthetic hydrocarbons, modified waxes, aliphatic alcohols and acids. , Synthetic waxes such as fatty acid ester and glyceride type, hydrogenated wax type, synthetic ketone / amine and amide type, chlorinated hydrocarbon type, synthetic animal wax type, and alpha-olefin wax type.

The total film pressure of the photosensitive layer and the colored layer of the present invention may be about 1 to 5 μm, and an appropriate coating amount is 0.5 g / m ² although it depends on the amount of the dye or pigment contained.
About 50 g / m ² is suitable. About 0.5 to 4 μm is suitable for the photosensitive layer, and it is determined by adjusting the adhesive force to the support, the thermal adhesive force to the image receiving paper of the colored layer, the breaking force, and the like. As a coating method, a bar coater, a spin coater or the like is used, and various coaters suitable for mass production can be used.

Next, the image forming process according to the present invention will be described. In order to prevent misalignment during image exposure of each color, position determining means such as punching holes for register pins are set in the image forming material, the color separation image mask, and the image receiving paper. Image exposure is performed with light having a wavelength that activates a polymerization initiator such as ultraviolet light, and the exposed portion of the photosensitive layer of the image forming material is cured. The colored layer and the image receiving paper such as paper are overlapped and transferred under pressure or if necessary under heat / pressure. By peeling by holding one end of the support, the image formed in the photosensitive layer is transferred to the image receiving paper together with the coloring layer by the balance of various designed forces to form a transfer image. It The design is easier if the exposed part is transferred. In addition, if necessary, in order to eliminate the tackiness of the photosensitive layer of the transferred image, post-exposure is performed, or a matte sheet set for removing the photosensitive layer and a part of the coloring layer is overlaid,
The image quality may be adjusted by performing heating, pressurizing, and peeling work.

By repeating the above steps (4) (yellow, magenta, cyan, black) four times with different color separation image masks and image forming materials as required, a simple proof with a texture and quality level close to proof printing can be obtained. Can be obtained.

In the present invention, a photopolymerizable compound and a polymerization initiator are contained in the photosensitive layer, and the color is produced by the action of the adhesive force of the photosensitive layer to the support and the adhesive force of the colored layer to the image receiving paper. Image formation can be performed by image exposure. Further, since the photosensitive layer is not exposed to the air, a cover film is not necessary even during exposure.

[0034]

EXAMPLES Next, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples. In addition, "parts" means "parts by weight" and "%" means "% by weight".

Example 1 (1) Formation of Photosensitive Layer As an organic polymer binder, polyester (Vylon 30) was used.
0; manufactured by Toyobo Co., Ltd.), tetraethylene glycol diacrylate as a photopolymerizable compound (A-4EG; manufactured by Shin-Nakamura Chemical Co., Ltd.), trimethylolpropane triacrylate (TMPTT; manufactured by Shin-Nakamura Chemical Co., Ltd.) , Using benzophenone (KAYACUREBP; manufactured by Nippon Kayaku Co., Ltd.) and 2-hydroxy-2-methyl-propiophenone (Darocur 1173; manufactured by Merck Ltd.) as polymerization initiators, as described below. Was formed. First, a polyester resin was dissolved in MEK (methyl ethyl ketone) (3 parts by weight of resin, 7 parts by weight of solvent) to prepare a polymer solution. Next, the photopolymerizable compound is A-4EG: 1 part by weight, ATMPT: 3 parts by weight, resin: 1 part by weight (solid content).
To a polymer solution, and 5 parts by weight of a polymerization initiator was added in an amount of 3% by weight of the solute to obtain a photosensitive solution. This photosensitive solution was applied to a corona-treated polyethylene terephthalate film having a thickness of 25 μm as a support by a wire bar coater so that the film thickness when dried was 1 μm, and then heated at 100 ° C. in a warm air drier. The photosensitive layer was formed by drying for one minute.

(2) Formation of Colored Layer As a pigment, the one for yellow is Lionol Yellow FG30.
(Manufactured by Toyo Ink Mfg. Co., Ltd.), Magnolia for Lionol Red 7BFG4412 (manufactured by Toyo Ink Mfg. Co., Ltd.),
Rionol Blue FG7330 (manufactured by Toyo Ink Mfg. Co., Ltd.) for cyan and MA7 (Mitsubishi Carbon Co., Ltd.) for black were used to form a colored layer as follows. First, an acrylic resin was synthesized as an organic polymer binder. 50 g of isobutyl acrylate, 50 g of acrylamide, 5 g of azobisisobutyl nitrile and 250 g of benzene were added, and the mixture was stirred under a nitrogen atmosphere and reacted at 60 ° C. for 15 hours to give a Tg of about 100.
This is a copolymer having a temperature of ℃ and a molecular weight of about 10,000. Next, this acrylic resin was dissolved in toluene (resin 3
Parts by weight and 7 parts by weight of solvent) to prepare a polymer solution.
Next, the above pigments were mixed with this polymer solution so as to have a solid content of 18% by weight of yellow, 18% by weight of magenta, 18% by weight of cyan and 9% by weight of black.
Vibration mill (5400N2 with mmφ glass beads)
It was vibrated for 10 minutes or more with a mold (manufactured by Red Devil Co., Ltd.) to disperse and obtain a coating material colored in each color. This coating material was applied onto the above-mentioned photosensitive layer with a wire bar coater so that the film thickness when dried was 2 μm, and then the temperature was kept at 100 ° C. 2 with a warm air dryer.
The colored layer was formed by drying for a minute. An image forming body for each color was obtained through the above steps.

(3) Image reproduction test After the color separation of the test original and the image forming body on which the image forming material of each of the four colors corresponding to the positive film is formed, are accurately aligned with the register pin. ,
Exposure machine for 1.5 kW ultra-high pressure mercury lamp (Oak Seisakusho Co., Ltd.)
Manufactured), with an optical output of 5 mW, 100 mJ / cm ²
Exposure was performed so that Then, after closely contacting with the printing paper, the printing paper was peeled off while applying an appropriate roller pressure (50 Kg / cm ² ) and heating to obtain a color reproduction image of the test original. This reproduced image is 5
Post-exposure corresponding to 00 mJ / cm ² was performed to eliminate tackiness. As a result, the transferred photosensitive layer and colored layer had almost the same thickness as the coating thickness and had a resolution of about 20 lines / mm.

For the other three color image forming materials,
Images were formed in the same order in the order of yellow, magenta, cyan, and black, and a color reproduction image of the test original was formed on the printing paper to form a good simple proof.
The resolution of the obtained simple proof was sufficient, and the texture and quality were as good as the proof.

Example 2 (1) Formation of Photosensitive Layer A photosensitive liquid for the photosensitive layer having the following composition was prepared. Acrylic resin (Kayarad R60
4; Nippon Kayaku Co., Ltd.) and oligoester acrylate (M-7100; Toa Gosei Co., Ltd.), and benzophenone (KAYACUREBP; Nippon Kayaku Co., Ltd.) and 4,4-bis as a polymerization initiator. (Diethylamino) benzophenone (Hodogaya Chemical Co., Ltd.) was used. further,
As an organic polymer binder, diallyl phthalate (DAP
L; Osaka Oxygen Co., Ltd. was used to form a photosensitive layer as follows.

First, a diallyl phthalate resin was dissolved in MEK (2 parts by weight of resin, 70 parts by weight of solvent) to prepare a polymer solution. Next, R604: 1 part by weight, M-71
The photopolymerizable compound was mixed with the polymer solution such that the amount was 00: 0.5 parts by weight and the resin: 0.2 parts by weight (solid content).
Further, a mixture of the above two kinds of initiators in the same amount was added to the solute in an amount of 5% by weight, and the mixture was stirred and dissolved to obtain a photosensitive solution. Example 1 except that the dispersion time of the photosensitive solution was increased.
Dispersion and coating were carried out in the same manner as in. Drying was performed with a warm air dryer at 100 ° C. for 2 minutes to form a photosensitive layer.

(2) Formation of Colored Layer For the yellow pigment, Lionol Yellow FG131 is used.
0 (manufactured by Toyo Ink Mfg. Co., Ltd.), Carmin 7BFG4412 for magenta (manufactured by Toyo Ink Mfg. Co., Ltd.), Lionol Blue FG7330 (manufactured by Toyo Ink Mfg. Co., Ltd.) for cyan, and MA7 (Mitsubishi Carbon) for black. (stock)
Manufactured) was used. As the organic polymer binder, 50 parts by weight of the acrylic resin of Example 1, 45 parts by weight of a linear saturated polyester resin (Elitel 3200 manufactured by Unitika Ltd.), and 5 parts by weight of polyethylene wax were mixed and dissolved in toluene. (30 parts by weight of resin, 70 parts by weight of solvent),
A polymer solution was prepared. Next, the above pigment was added to this polymer solution in a solid content of yellow 18% by weight and magenta 18
The respective components were mixed so that the respective weight percentages were 18% by weight, 18% by weight of cyan, and 9% by weight of black, and a colored layer was formed on the photosensitive layer in the same manner as in Example 1. An image forming body for each color was created through the above steps.

(3) Image Reproduction Test This image-formed body was image-wise exposed in the same manner as in Example 1 and then transferred onto a printing paper as in Example 1. As a result, a good color image that reproduces the test original could be created. The resolving power showed a value of about 25 mm / line.

[0043]

Since the image forming method according to the present invention is an image forming method utilizing the adhesive force of the photosensitive layer of the image forming material and the adhesive force of the colored layer, an intermediate image receptor or a specially treated image receiving paper can be used. It is not necessary, and a good simple proof can be easily created on printing paper at low cost. In addition, since the photosensitive layer is not directly exposed to the air, a cover film is unnecessary and further cost reduction can be achieved.

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Claims (7)

[Claims] 1. A laminate comprising a photosensitive layer containing a photopolymerizable compound and a photopolymerization initiator, and a colored layer containing a dye or pigment and an organic polymer binder having no photopolymerizability. An image forming material characterized by: 2. A photosensitive layer containing a photopolymerizable compound and a photopolymerization initiator, and a colored layer containing a dye or pigment and an organic polymer binder having no photopolymerizability on a support. An image forming body, which is formed by sequentially stacking layers. 3. A photosensitive layer containing a photopolymerizable compound and a photopolymerization initiator on a support, and a dye or pigment and an organic polymer binder having no photopolymerizability thereon. The image forming body is formed by stacking the colored layers to form an image forming body, and the image forming body is subjected to image exposure to cause a difference in adhesiveness between the exposed portion and the non-exposed portion of the photosensitive layer. An image forming method comprising: stacking an image receiving sheet on the side of the colored layer, applying pressure, peeling the image receiving sheet, and transferring the image forming material including the photosensitive layer and the colored layer onto the image receiving sheet. 4. The image forming material according to claim 1, wherein the photopolymerization initiator is sensitive to ultraviolet rays. 5. The photopolymerization initiator is benzophenone,
4,4-bis (diethylamino) benzophenone, 4-
It is at least one kind of polymerization initiator selected from the compound group of methoxy-4-dimethylaminobenzophenone, 2-ethylanthraquinone, phenanthraquinone, benzoin, benzoin methyl ether, and benzoin phenyl ether. 1. The image forming material described in 1. 6. The image forming method according to claim 3, wherein heating is performed when the image forming body is pressed against the image receiving paper. 7. The image forming method according to claim 3, wherein ultraviolet rays are used for image exposure.