JPH08171204A - Image forming material - Google Patents

Abstract

PURPOSE: To improve transferability and image reproducibility and to form an image very resemble to printed matter by laminating an over-coating layer contg. a releasing agent and a protective film on a photosensitive colored layer. CONSTITUTION: An overcoating layer contg. a releasing agent and a protective film are laminated on a photosensitive colored layer. The overcoating layer contains the releasing agent in a material soluble or swellable in a generally used developer, e.g. PVA, polyethylene oxide, polyacrylic acid, polyacrylamide, polyvinyl methyl ether, polyvinylpyrrolidone, polyamide, gum arabic, glue, gelatin, casein, cellulose or starch. The releasing agent is, e.g. various surfactants, silicone oil, wax, higher alcohol or metallic soap.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION This invention relates to imaging materials suitable for making color proofs. More specifically, it relates to an image forming material which forms an image by performing exposure from the support side.

[0002]

2. Description of the Related Art Color proofing is generally performed by proof printing as a pre-step of main printing in multi-color printing. A photosensitive transfer sheet for color proofing (color proofing sheet) exposes and develops an image forming material through a decomposition mesh film for each color plate to form a decomposed image on a photosensitive layer, and thereafter, this decomposed image is discriminated. It can be obtained by transferring onto a support. A multicolor image can be obtained by repeating the step of transferring a separate color separated image onto the support on which the separated image is transferred.

Conventionally, when the tackiness of a photosensitive colored layer is improved to improve transferability, the mechanical strength of the photosensitive colored layer decreases accordingly, so that the overcoat layer is deformed during exposure. However, when an image is formed, a problem such as color shift may occur. This occurs because physical pressure is applied to the decomposed mesh film for each color plate and the image-forming material at the time of exposure.

[0004]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an image forming material capable of transferring an image without causing a problem even when the tackiness of the photosensitive colored layer is improved.

[0005]

Means for Solving the Problems As a result of intensive studies to achieve the above-mentioned object, the present inventors prevent the overcoat layer from being deformed by further laminating a protective film on the overcoat layer to protect the overcoat layer. In order to improve the releasability of the film, it was found that by incorporating a release agent in the overcoat layer, it is possible to eliminate the problem of deformation at the time of exposure even if the photosensitive coloring layer is relatively soft, and color misalignment accompanying it, The present invention has been completed.

That is, the gist of the present invention is to provide an image forming material in which a release layer and a photosensitive coloring layer are provided in this order on a support, and an overcoat layer containing a releasing agent on the photosensitive coloring layer. And an image forming material characterized by laminating a protective film. Hereinafter, the present invention will be described in detail. The support used in the present invention is preferably transparent in that it allows exposure from the surface on which the photosensitive layer is not provided, but it has resistance to a developer and dimensional stability to heat. Any material may be used, for example, polyolefins such as polypropylene, polyesters such as polyethylene terephthalate, polybutylene terephthalate and polyethylene naphthalate, polyamides such as nylon 6, nylon 6/6, polyester amides and polycarbonates. , Synthetic resin films such as polyetherketone or copolymers or mixtures thereof. As an example of the copolymer, for example, polyester is a polyester obtained by using aromatic dicarboxylic acid or its ester and glycol as main starting materials. Above all, 80% or more of repeating structural units are ethylene terephthalate units or ethylene-2,6. -Polyesters with naphthalate units are preferred. Examples of the copolymerization component in this case include isophthalic acid, phthalic acid, adipic acid and sebacic acid as the aromatic dicarboxylic acid component, and p-oxyethoxybenzoic acid, p-oxybenzoic acid and the like as the oxycarboxylic acid component. Examples of the glycol component include diethylene glycol, propylene glycol, butane glycol, cyclohexanedimethanol, neopentyl glycol and the like. However, in this case, the most preferable is a homopolymer of polyethylene terephthalate, and a biaxially stretched polyethylene terephthalate film is particularly preferable.

Further, the support of the present invention has a maximum thermal expansion coefficient αt _max of 2.5 × 10 ^-5 / ° C. or less in order to reduce color misregistration due to a difference in thermal expansion coefficient between the longitudinal direction and the lateral direction during transfer. It is preferable to select one having an orientation angle in the range of −20 degrees to +20 degrees. Therefore, in the case of aiming at a high-definition image, it is preferable to select one having a small both αt _max and orientation angle.

Here, the maximum coefficient of thermal expansion αt _max means the maximum coefficient of thermal expansion αt in any direction at any position on the surface of the support. The measuring method will be described later, but in the case of an ordinary biaxially stretched film, the maximum value is the main orientation direction in the film plane or the direction orthogonal thereto. The orientation angle is a numerical value obtained by measuring the orientation of the polymer molecule fixed during the stretching and crystallization of the film by its polarization property. The orientation angle can be known by placing the sample between two polarizing plates and measuring the intensity of light passing through the sample while rotating the direction of the sample. If the film is stretched uniformly in the machine direction and the width direction, the orientation angle will always be 0 degree at the center of the stretched film in the width direction. Orientation angles can be compared. When the sample is rotated between the polarizing plates, the angle at which the amount of light passing through the sample becomes the minimum is the orientation angle of the sample. The orientation angle takes bilaterally symmetrical values (only the signs are opposite) with the center in the width direction as the axis of symmetry. The value is 0 at the center, and the absolute value of the orientation angle gradually increases toward the end of the support.

The method for producing the support in the present invention can be obtained, for example, by performing sequential biaxial stretching or simultaneous biaxial stretching under the same stretching conditions at the same stretching ratio in both the longitudinal and transverse directions, and then performing heat treatment. To be In this case, it is preferable that the stretching ratios in the vertical and horizontal directions are the same. The subsequent heat treatment is preferably performed in a relaxed state. In addition, it is preferable to add inorganic particles such as silica, alumina, kaolin and talc to the support of the present invention in order to improve handleability.
The thickness of the support is not particularly limited, but is preferably 10 to 300 μm from the viewpoint of mechanical strength and heat conduction during transfer,
More preferably, it is 50 to 100 μm.

In the present invention, a release layer is provided on the support in order to improve the transferability of the image formed on the support. For the release layer, for example, a vinyl acetate-based copolymer such as an ethylene-vinyl acetate copolymer, an ethylene-propylene-vinyl acetate copolymer or a modified product thereof is used. Considering transferability, an ethylene-vinyl acetate copolymer having a softening point of 50 to 120 ° C. is more preferable.

A method for forming a release layer using an ethylene-vinyl acetate copolymer is disclosed in JP-A-3-18194.
Examples of the method include coating and drying methods, dry laminating method, hot melt laminating method, and coextrusion method as described in Japanese Patent Publication No. Other components of the release layer include, for example, JP-A Nos. 51-5101 and 59-97140.
Nos. 63-2040 and the like, for example, alcohol-soluble polyamide, alcohol-soluble nylon, a blend of partially esterified resin of a copolymer of styrene and maleic anhydride and methoxymethylated nylon, Polymers of acrylic acid and its derivatives, polyvinyl chloride, polyvinyl butyrate, cellulose acetate and the like can also be contained.

The thickness of the release layer is preferably 5 to 200 μm.
m, and more preferably 50 to 100 μm. The photosensitive colored layer of the present invention may be one layer by itself,
The present invention is not limited to this, and it may be divided into two layers of a colored layer containing at least a colorant and a binder and a photosensitive layer containing at least a photosensitive composition and a binder. In this case, either layer may be present on the release layer side or the transparent support side. In the following description, the photosensitive colored layer mainly composed of one layer will be described. Therefore, unless otherwise specified, the term "photosensitive layer" means a photosensitive colored layer.

For the photosensitive layer, a photopolymerizable composition (for negative type photosensitive layer), a quinonediazide compound (for positive type), a diazo compound / azide compound (for negative type) and the like can be used. When the photosensitive layer is formed by the photopolymerizable composition,
A monomer compound such as a polyfunctional vinyl monomer or vinylidene compound capable of forming a photopolymer by at least one addition polymerization, and a photopolymerization initiator activated by actinic rays, etc., and a thermal polymerization inhibitor is added if necessary. It

The vinyl monomer or vinylidene compound which can be used in the photopolymerizable composition is preferably, for example, an unsaturated ester of polyol, particularly an ester of acrylic acid or an ester of methacrylic acid. Specific examples include ethylene glycol diacrylate, glycerin triacrylate,
Polyacrylate, ethylene glycol dimethacrylate, 1,3-propanediol dimethacrylate, polyethylene glycol dimethacrylate, 1,2,4-butanetriol trimethacrylate, trimethylolethane triacrylate, pentaerythritol dimethacrylate, pentaerythritol trimethacrylate,
Pentaerythritol tetramethacrylate, pentaerythritol diacrylate, pentaerythritol triacrylate, pentaerythritol tetraacrylate, dipentaerythritol polyacrylate, 1,
Examples thereof include, but are not limited to, 3-propanediol diacrylate, 1,5-pentanediol dimethacrylate, and bisacrylate and bismethacrylate of polyethylene glycol having a molecular weight in the range of 200 to 400.

The photopolymerization initiator and the thermal polymerization inhibitor are not particularly limited, and known compounds can be used. Next, examples of the quinonediazide compound used for forming the photosensitive layer include ester compounds of o-naphthoquinonediazide sulfonic acid and a polycondensation resin of phenols and aldehydes or ketones.

Examples of the phenols include monohydric phenols such as phenol, o-cresol, m-cresol, p-cresol, 3,5-xylenol, carvacrol and thymol, and dihydric phenols such as catechol, resorcinol and hydroquinone. , Trivalent phenols such as pyrogallol and phloroglucin. Examples of the aldehyde include formaldehyde, benzaldehyde,
Examples include acetaldehyde, crotonaldehyde, furfural and the like. Preferred of these aldehydes are formaldehyde and benzaldehyde.

Further, examples of the above-mentioned ketone include acetone and methyl ethyl ketone. Specific examples of the polycondensation resin include phenol / formaldehyde resin, m-cresol / formaldehyde resin, m-, p
-Mixed cresol / formaldehyde resin, resorcin / benzaldehyde resin, pyrogallol / acetone resin and the like.

The condensation rate of o-naphthoquinonediazide sulfonic acid with respect to the OH group of the phenol of the o-naphthoquinonediazide compound (reaction rate for one OH group) is
15 to 80% is preferable, more preferably 20 to 45%
Is. The polymer compound containing o-quinonediazide used in the present invention preferably has a weight average molecular weight of 1,000 or more, more preferably 1,500 or more, in consideration of coating properties.

Further, examples of the o-quinonediazide compound used in the present invention include the compounds described in JP-A-58-43451. Further, 2,3,4-trihydroxybenzophenone, 2,3,4,4'-tetrahydroxybenzophenone, 2,3,4,2 ', 4'-
Pentahydroxybenzophenone, 2,3,4,3 ',
A condensation compound of 4 ', 5'-hexahydroxybenzophenone or the like and orthoquinone diazide sulfonic acid can also be used.

Of the above o-quinonediazide compounds,
O-quinonediazide ester obtained by reacting 1,2-naphthoquinonediazidesulfonyl chloride, 1,2-naphthoquinonediazidesulfonyl chloride, a condensation product of pyrogallol-acetone condensation resin or novolac resin, or 2,3,4-trihydroxybenzophenone Most preferred are compounds.

As the o-quinonediazide compound used in the present invention, the above compounds may be used alone or in combination of two or more kinds. The preferable amount of the o-quinonediazide compound used is the binder 1 in the photosensitive layer.
It is 10 to 40 parts by weight with respect to 00 parts by weight. The diazo compound is represented by a condensate of p-diazodiphenylamine and formaldehyde, and is preferably JP-B-47-1167 and JP-A-57-43890.
Water-insoluble and ordinary organic solvent-soluble substances described in JP-A No. 1993-154, etc. are used.

Further, as the azide compound, an aromatic diazide compound having an azide group bonded to an aromatic ring directly or through a carbonyl group or a sulfonyl group is preferably used. For example, polyazidostyrene, polyvinyl-p-, as described in U.S. Pat. No. 3,093,311.
Azidobenzate, polyvinyl-p-azidobenzal, a reaction product of an azidoarylsulfonyl chloride and an unsaturated hydrocarbon polymer described in JP-B-45-9613, a polymer having a sulfonyl azide or a carbonyl azide, etc. JP-A-43-21017, 4
4-22954 and 45-24915).

Other negative photosensitive compositions include compounds containing cinnamic acid derivatives, such as polyesters and polyamides containing -C = C-CO- groups described in US Pat. No. 3,453,237. Etc., 273230
Examples thereof include cinnamic acid esters of hydroxyl group-containing polymers such as polyvinyl alcohol and cellulose described in No. 1 specification.

Typical examples of the binder resin used in the photosensitive layer include novolac resins, acrylic resins, vinyl acetate resins, polyurethane resins and epoxy resins. For example, as the novolac resin, a phenol / cresol / formaldehyde copolycondensation resin as described in JP-A-55-57841, JP-A-55
The copolycondensation resin of p-substituted phenol and phenol or cresol and formaldehyde described in JP-A-127553 is mentioned. As the vinyl acetate resin, the vinyl acetate-vinyl versatate copolymers described in JP-A-3-48248 and JP-A-3-181947 are preferably used.

An appropriate colorant is contained in the photosensitive layer. As the colorant, a dye or a pigment can be used. For example, yellow, magenta, cyan, and black pigments, dyes, and other metal powders, white pigments, fluorescent pigments, and the like can be used. The following are some of the many pigments and dyes known in the art. (C.I. means color index.)

[0026]

Table 1 Victoria Pure Blue (CI. 42595) Auramine (CI. 41000) Catillon Brilliant Flavin (CI. Basic 13) Rhodamine 6GCP (CI. 45160) Rhodamine B (CI. 45170) Safranine OK 70: 100 (CI. 50240) Erioglaucin X (CI. 42080) First Black HB (CI. 26150) No. 1201 Lionol Yellow (CI 21090) Lionol Yellow GRO (CI 21090) Shimura-First Yellow 8GF (CI 21105) Benzidine Yellow 4T-564D (CI 21095) Shimura-First Red 4015 (C.I. 12355) Rionol Red 7B4401 (C.I. 15830) Fastgen Blue TGR-L (C.I. 74160) Rionol Blue SM (C.I. 26150) Mitsubishi Carbon Black MA-100 Mitsubishi Carbon black # 30, # 40, # 50 Cyanine Blue 4920 (manufactured by Dainichiseika) Seika Fast Carmine 1483 (manufactured by Dainichiseika) Seika First Yellow H-7005,2400 (manufactured by Dainichiseika)

The blending amount of the colorant in the photosensitive layer can be determined in consideration of the target optical density and the removability of the photosensitive layer from the developing solution. For example, in the case of dyes, it is generally preferred to be 5 to 75% by weight, in the case of pigments, it is generally preferred to be 5 to 90% by weight, and more preferably both are 5 to 50%. The film thickness of the photosensitive layer is the target optical density, the type of colorant used in the photosensitive layer (dye,
It can be selected depending on the pigment, carbon black) and its content, but the thinner the film, the higher the resolution and the better the image quality. Therefore, the film thickness is 0.1
It is preferably used in the range of 5 μm. In addition to the materials described above, a plasticizer, a coatability improver and the like may be added to the photosensitive layer, if necessary.

Examples of the plasticizer include various low molecular weight compounds such as phthalic acid esters, triphenyl phosphates and maleic acid esters, and examples of the coating property improver include ethyl cellulose and polyalkylene ether. Examples of the surfactant include nonionic surfactants and the like, and fluorine-based surfactants. The photosensitive layer is generally formed by dissolving a photosensitive composition and, if necessary, a colorant, and an appropriate binder in an appropriate solvent to prepare a coating solution, and coating the solution on a release layer. it can.

Examples of usable solvents include methyl lactate, methyl ethyl ketone, cyclohexanone, ethylene dichloride, dichloromethane, acetone, methyl ethyl ketone, methyl isobutyl ketone, ethyl acetate, ethylene glycol monomethyl ether, ethylene glycol monomethyl ether acetate, ethylene glycol monoethyl ether. , Ethylene glycol monoethyl ether acetate, N, N-dimethylformamide,
Dimethyl sulfoxide, N, N-dimethylacetamide, acetylacetone, dioxane, tetrahydrofuran, γ-butyrolactone, propylene glycol monomethyl ether, propylene glycol monoethyl ether acetate, propylene glycol monoethyl ether acetate, diethylene glycol dimethyl ether, diethylene glycol diethyl ether, etc. Can be used. Particularly preferred is methyl lactate or methyl ethyl ketone, or a mixture of these with other solvent as the main component.

The coating method for coating these colored photosensitive layers on the release layer is, for example, roll coating,
Reverse roll coating, dip coating,
Air knife coating, gravure coating, gravure offset coating, hopper coating,
Methods such as blade coating, rod coating, wire doctor coating, spray coating, curtain coating and extrusion coating are used.

In order to provide a plurality of layers, such as when the photosensitive colored layer is divided into a colored layer and a photosensitive layer, and when an overcoat layer is further coated on the photosensitive colored layer, coating is performed for each layer. After drying, the multi-layer coating method that winds up, multiple coaters and dryers are installed side by side on one line,
A method of providing a plurality of layers by one-time conveyance of the support (for example, JP-A-63-69574) can be used.

Drying is performed by blowing heated air to the coated surface or the like. Heating temperature is 30-200
C. is preferable, and a range of 40 to 140.degree. C. is particularly preferable. During drying, a method of drying the colored photosensitive layer while keeping the temperature of heated air constant is generally performed,
A method in which the temperature of the heated air is raised stepwise and dried is also possible. The heated air is preferably supplied to the coated surface at a rate of 0.1 to 30 m / sec, and particularly preferably 0.5 to 20 m / sec.

The overcoat layer in the present invention is a protection for preventing adhesion of dust or the like to the photosensitive colored layer, or a protection for scratches or the effect of oxygen when a photopolymerizable substance is contained in the photosensitive colored layer. It is provided to prevent this. The overcoat layer is made of a material that is soluble or swellable in a commonly used developing solution and contains a release agent. Examples of the material that can be dissolved or swelled in the developer used for the overcoat layer include polyvinyl alcohol, polyethylene oxide, polyacrylic acid, polyacrylamide, polyvinyl methyl ether, polyvinylpyrrolidone, polyamide, gum arabic, glue and gelatin. , Casein, celluloses (eg, viscose, methyl cellulose, ethyl cellulose, hydroxyethyl cellulose, hydroxypropyl methyl cellulose, carboxymethyl cellulose, etc.),
Examples include starches (eg, soluble starch, modified starch, etc.) and the like.

Any known release agent can be used without limitation as long as it does not adversely affect the developability and coatability. Typical examples are various surfactants, silicone oils,
Wax, higher alcohol, metal soap and the like can be mentioned.
Preferred are dimethylsiloxane compounds, and organosiloxane compounds in which functional groups such as long-chain alkyl groups, alkoxy groups, amino groups and epoxy groups are introduced. Particularly preferred is a dimethyl silicone oil substituted with a polyether group (for example, L7600, L7602, L7604, L7 manufactured by Nippon Unicar Co., Ltd.).
607 etc.) and the like.

The amount of the release agent added is 0.5 to 20% by weight, preferably 1 to 10% by weight in the overcoat layer. The protective film in the present invention is provided on the overcoat layer for protecting the surface properties of the photosensitive coloring layer and the overcoat layer. What can be used for the protective film is not particularly limited as long as it is a film or sheet having excellent mechanical properties and surface properties. Specific examples thereof include the same as the above-mentioned transparent support. In this case, the film thickness is in the range of 1 to 200 μm, preferably 5 to 100 μm.

The method for producing the image-forming material of the present invention is not particularly limited, and as described above, it is successively formed on the support.
Although a method of forming each layer may be used, a film in which a film in which an overcoat layer is provided on the protective film is prepared, and then a film in which a photosensitive coloring layer is provided on a support is laminated by a usual method is smooth. Is preferable because it is easy to create.

An image forming method using the image forming material of the present invention will be described below with reference to an example of a multicolor image using four colors, but the present invention is not limited to this description. That is, first, the color separation network film and the colored image forming material corresponding to each color are brought into close contact with each other, and image exposure is performed by irradiating light such as ultraviolet rays. As a light source, a mercury lamp,
Ultra-high pressure mercury lamps, metal halide lamps, tungsten lamps, xenon lamps, fluorescent lamps, etc. are used. Similarly, the other three colors are performed.

Next, each exposed material is subjected to liquid development with a developing solution, washed with water and dried to form an image portion. In this case, as another developing method, for example, JP-A-2-
As described in Japanese Patent No. 269349, the image portion can be formed by using a method of performing peeling development by peeling the cover sheet instead of liquid developing with a developing solution.

Next, after exposing and developing as described above to form an image portion, the formed image portion is transferred to a material to be transferred to obtain a transferred image. In this case, it is preferable to adopt a format in which only the formed image portion is transferred, because the transferred image becomes very close to a printed matter. That is, the first colored image is formed on the first colored image forming material, at least the colored image is transferred to the transfer material, and the support is peeled off. Further, after the second color colored image is formed on the second color colored image forming material, the second color image formed along with the second color colored image is registered on the transfer material to which the first color image has already been transferred. While transferring, the support is peeled off to obtain a two-color aligned image. Similarly, the third color and the fourth color (more images, if necessary) are transferred onto the same transfer material to obtain a multicolor image. In some cases, this multicolor image may be indirectly transferred onto another transfer material to obtain a final multicolor image. Incidentally, this type of method is disclosed in JP-A-47-41830, JP-A-59-97140 and JP-A-60-23649.
No. 3,775,113 and U.S. Pat. No. 3,775,113. At this time, from the image obtained on the support, only the image portion can be directly transferred and laminated on the material to be transferred. That is, it is preferable that only the image layer that substantially forms an image is transferred and laminated.

A transfer method is disclosed in Japanese Patent Laid-Open No. 3-1205.
It is also preferable to adopt the method described in Japanese Patent Publication No. 52-52. In this case, substantially only the image layer forming an image is transferred and laminated, and the transfer is directly performed on the actual paper, so that the transfer process is reduced by one time compared with the indirect transfer method. Therefore, the work time is shortened, and since the adhesive image-receiving sheet used for indirect transfer is not used, the work for aligning the image-receiving sheet and the support on which the image is formed is easy, and therefore workability is improved. And particularly preferred.

Further, it is general to apply heat and / or pressure during the transfer. The temperature and pressure at this time vary greatly depending on the layer structure and the components forming each layer. Usually, the temperature is room temperature to 140 ° C., and the pressure is 0 to 20 kg / cm ^2, but in the present invention, the temperature is 70 to 100.
The temperature and the pressure are preferably in the range of 3 to 10 kg / cm ² . This condition can be obtained by various known devices. For example, a method of passing between heat rolls as disclosed in JP-A-62-80658 can be mentioned. Further, the method described in JP-A-3-120552 is also preferably used.

Various methods can be used as a method of alignment (registration). For example, a register pin can be fixed by sticking the image-formed support on an adhesive support to fix the image, and by using the pin holes used to fix the color separation original at the time of exposure. For example, a method of registering with a bar. The former is JP-A-6
Although described in JP-A-3-78788 and JP-A-2-19148, the latter method using a register pin bar is preferable in the present invention.

Examples of the image receiving material include paper such as high quality paper, art paper and coated paper, plastic film such as polyester film and acetate film or an intermediate layer, plastic film coated with an image receiving layer, metal such as aluminum foil and copper foil. Foil or a composite material thereof is used.

[0044]

The present invention will be described in more detail based on the following examples, but the invention is not limited to the examples described below, but includes various aspects. Example 1 (Support) On a biaxially stretched polyethylene terephthalate film (width 65 cm) having a thickness of 75 μm, an ethylene-vinyl acetate copolymer resin (Mitsui-DuPont Polychemical Co. E
VAFLEX P-1405: vinyl acetate content 14% by weight, VICAT softening point 68 ° C.) was extruded to form a release layer having a thickness of 25 μm by a laminating method. (Preparation of photosensitive layer) 4 of the following composition on the above-mentioned support
Each color photosensitive solution was applied and dried using a bar coater to form a photosensitive colored layer having a dry film thickness of 1.5 μm. (Negative type photosensitive layer coating liquid composition)

[0045]

[Table 2] Vinyl acetate-vinyl versatate copolymer (80:20 wt%, weight average molecular weight 50,000, 50% methanol solution) 12 parts by weight pentaerythritol tetraacrylate 4.3 parts by weight Michler's ketone 0.04 Parts by weight benzophenone 0.25 parts by weight paramethoxyphenol 0.01 parts by weight methyl cellosolve 94 parts by weight fluorine-based surfactant (3M, FC-430) 0.01 parts by weight the following pigments (pigments)

[0046]

[Table 3] Black: Carbon black MA-100 (manufactured by Mitsubishi Kasei) 1.98 parts by weight Cyan: Cyanine blue 4920 (manufactured by Dainichiseika) 1.10 parts by weight Magenta: Seika Fast Carmine 1483 (Dainichiseika) 1.36 parts by weight Yellow: Seika First Yellow 2400 (manufactured by Dainichiseika Co., Ltd.) 1.36 parts by weight

Next, a biaxially stretched polyethylene terephthalate film having a thickness of 25 μm (width 65
cm) was coated with an overcoat layer liquid having the following composition by a bar coater so as to have a dry film thickness of 0.5 μm, and dried. The protective film and the above-mentioned film on which the photosensitive layer had been coated were laminated so that their coated surfaces face each other and pressed by a laminator to laminate them. (Overcoat layer coating liquid composition)

[0048]

[Table 4] Polyvinyl alcohol (GL-05 manufactured by Nippon Synthetic Chemical Industry Co., Ltd.) 6 parts by weight Demineralized water 97 parts by weight Release agent (L7600 Silicone surfactant manufactured by Nippon Unicar Co., Ltd.) 0.3 parts by weight Methanol 3 parts by weight

(Transfer image forming method) A positive color separation network film of each color is superposed on the polyethylene terephthalate film surface which is a transparent support of the negative color image forming material of four colors obtained as described above, and a 4 kW metal halide. Image exposure from a distance of 50 cm with a lamp for 20 seconds,
After that, the protective film was peeled off and further developed by immersing it in the following developer at 30 ° C. for 30 seconds to form a 4-color colored image. The surface of the overcoat layer after peeling off the protective film was observed, but no particular abnormality was observed. (Developer composition)

[0050]

[Table 5] Konica PS plate developer SDP-1 (manufactured by Konica) 20 ml Perex NBL (manufactured by Kao Atlas) 50 ml Water 400 ml

A transfer image of four colors was formed on art paper by the method described in Example 1 of JP-A-3-120552 using the four sheets on which the above-mentioned colored images were formed. The drum and press roll temperatures are 80 ° C. and the roll pressure is 4 kg / cm ² . The obtained image had good transferability and was very similar to the image of a printed matter prepared by ordinary offset printing. No color shift was confirmed.

Comparative Example 1 A negative colored image forming material was prepared in the same manner as in Example 1 except that the coating liquid for overcoat layer was changed to the following.
Thereafter, exposure, development and transfer were performed in the same manner as in Example 1 to form a transfer image of four colors on the art paper. The obtained image had good transferability and was similar to the image of a printed matter prepared by ordinary offset printing. However, color misregistration was confirmed in part of the image. When the surface of the overcoat layer after peeling off the protective film after exposure was observed, the overcoat layer was peeled off, and a part where the photosensitive coloring layer was exposed was observed. (Overcoat layer coating liquid composition)

[0053]

[Table 6] Polyvinyl alcohol (GL-05 manufactured by Nippon Synthetic Chemical Industry Co., Ltd.) 6 parts by weight Demineralized water 97 parts by weight Methanol 3 parts by weight

Example 2 A positive type colored image forming material was prepared in the same manner as in Example 1 except that the photosensitive layer in Example 1 was changed to the positive type described below, and then a transfer image was formed on art paper in the same manner. did. (Composition of positive type photosensitive layer coating liquid)

[0055]

[Table 7] 2,3,4-trihydroxybenzophenone-naphthoquinone-1,2-diazide-4-sulfonic acid ester 0.62 parts by weight Vinyl acetate-vinyl versatate copolymer (80:20 wt%, weight average) 50,000 molecular weight, 50% methanol solution) 8.7 7 parts by weight Pigment below Cyclohexanone 35.2 parts by weight Fluorosurfactant (3M, FC-430) 0.01 parts by weight (pigment)

[0056]

[Table 8] Black: Carbon black MA-100 (manufactured by Mitsubishi Kasei) 0.99 parts by weight Cyan: Cyanine blue 4920 (manufactured by Dainichiseika Co., Ltd.) 0.55 parts by weight Magenta: Seika Fast Carmine 1483 (Dainichiseika Co., Ltd.) 0.68 parts by weight Yellow: Seika First Yellow 2400 (manufactured by Dainichiseika Co., Ltd.) 0.68 parts by weight As a result, the obtained image has good transferability and is a printed matter prepared by ordinary offset printing. It looked very similar to the image. No color shift was confirmed. The protective film was also easily peeled off.

[0057]

The image forming material of the present invention has excellent transferability,
It has high image reproducibility and can form an image that is very close to a printed matter.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Junko Tadano 1000 Kamoshida-cho, Aoba-ku, Yokohama-shi, Kanagawa Mitsubishi Chemical Corporation Yokohama Research Institute (72) Inventor St. Goto 1 Sakura-cho, Hino, Tokyo Konica Stock Company (72) Inventor Miyuki Hosoi 1-Sakura-cho, Hino City, Tokyo Konica Stock Company

Claims (3)

[Claims] 1. An image forming material comprising a support having a release layer and a photosensitive coloring layer in this order, and an overcoat layer containing a release agent and a protective film are laminated on the photosensitive coloring layer. An image forming material characterized by the above. 2. The photosensitive color layer is a photopolymerization composition containing a release agent, a colorant, at least one addition-polymerizable monomer compound, and a photopolymerization initiator. Image forming material. 3. The image forming material according to claim 1, wherein the release layer contains an ethylene-vinyl acetate copolymer having a softening point of 50 to 120 ° C.