JPH1069087A - Color image forming material and transfer image forming method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a color image forming material and a transfer image forming method capable of imparting a good transfer performance by preventing the generation of static electricity and electrostatic charging, also, preventing the occurrence of sticking and blocking, and suppressing the positional deviation at transfer, for example in the case of using as a color proof. SOLUTION: In this color image forming material provided with a coloring photosensitive layer containing a photosensitive material and a coloring agent on one surface of a substrate, and a back layer on another surface of the substrate, the back layer contains almost spherical grains, and when the thickness of the back layer is defined as (t), the diameter of the almost spherical grain is controlled to >=(t). Besides, the image is exposed on the color image forming material, and the color image formed on the substrate by a developing processing is transferred to a material to which an image is transferred, then, the transferred image is obtained. It is more preferable to add electrostatic charging preventing agent to the back layer, and also, to control the diameter of the spherical grain in the back layer to >=2t.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a colored image forming material and an image forming method suitable for producing a color proof for color proofing in color printing, for example, and more particularly to handling of a color sheet, The present invention relates to an image forming material and an image forming method which are excellent in alignment accuracy.

[0002]

2. Description of the Related Art In general, color proofing is performed by proof printing or the like as a pre-process of main printing in multicolor printing. Conventionally, a color image has been transferred to a transfer material such as transfer paper to obtain a multicolor color proofing sheet, and a transfer image forming material is used to obtain such a transfer image. Can be done. In order to obtain a multicolor transfer image on a material to be transferred by using a colored image forming material for color proofing, usually, a color separation network film of four colors of yellow, magenta, cyan, and black and a corresponding color photosensitive film are used. The colored image-forming material having a layer on a support is generally placed between a glass plate and a rubber sheet of an exposing machine having a vacuum printing frame, and a vacuum is applied between the glass plate and the rubber sheet,
After the color separation screen film and the colored image forming material are brought into close contact with each other, exposure is performed, and then development processing is performed to form four colored images of yellow, magenta, cyan, and black. In general, a method of sequentially transferring a colored image of each color onto a material to be transferred while performing the following operations is generally performed.

However, each of the above-described means is liable to generate static electricity during the process. This problem is particularly pronounced when the humidity is low (such as in winter). First, the colored image forming material has a thickness of 1 mm or less and a size of A1 or A1.
Normally, dozens of sheets are stored and transported because they are two or more, but when one sheet is taken out of the stacked state, triboelectric charging is likely to occur on the two stacked sheets, and If the charge is not easily attenuated, there is a problem that one of the sheets cannot be easily taken. Furthermore, peeling charging is likely to occur, and in the time when one sheet is taken, peeling charging occurs between the stacked materials, and dust is electrically attracted to the surface of the image forming material, and if it is bad, the worker may feel an electric shock. I do. Dust causes image defects when exposed in close contact with the color separation film described above.

When an image is formed by laminating an image forming material on a material to be transferred and obtaining an image, it is often necessary to stack a total of four image forming materials of four colors in a prepared order. is there. At this time, in order to laminate, when one sheet is taken out of the stacked image forming materials, dust is likely to be attracted to the image forming materials if electrification occurs due to friction or peeling. Further, the colored photosensitive layer and the back surface are easily blocked. In addition, in the transfer step in which the colored image is transferred onto the material to be transferred, if the material is charged with static electricity during the process, the slip property between the colored image forming material and the material to be transferred is reduced, and Matching becomes difficult, and it takes a long time to prepare a multicolor color proofing sheet, and productivity is reduced.

Also, by transferring only the necessary image directly to the material to be transferred from the colored photosensitive layer on the support, by using an image forming material which removes unnecessary portions by exposure after exposure and leaves only the necessary portions. To create a multicolor proofing sheet very similar to the printed matter, for example,
The processing apparatus described in U.S. Pat. No. 5,068,689 can be preferably used, but also in this case, static electricity is generated in the course of the process, and the colored image forming material and the processing apparatus come into close contact with each other, and the alignment between the color images is adjusted. This may cause a decrease in accuracy.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems. That is, for example, when used as a color proof, the generation of static electricity and the electrification are prevented.
It is an object of the present invention to provide a colored image forming material and a transferred image forming method that provide good transferability because sticking and blocking are prevented, and positional deviation during transfer is suppressed.

[0007]

SUMMARY OF THE INVENTION The object of the present invention is as follows.
On one surface of the support, a colored photosensitive layer containing a photosensitive composition and a colorant is provided, and in the colored image forming material provided with a back layer on the other surface, the back layer contains spherical particles,
Assuming that the thickness of the back layer is t, the diameter of the spherical particles is t
This is achieved by using a colored image forming material characterized by the above. Further, the colored image forming material is subjected to image exposure, and a colored image formed on a support by a development process is transferred. This is achieved by a transfer image forming method characterized in that a transfer image is obtained by transferring to a material. More preferably, it is better achieved by adding an antistatic agent to the back layer, and furthermore, by setting the diameter of the spherical particles of the back layer to 2t or more.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail. The basic constitution of the colored image forming material is a support, a colored photosensitive layer provided on one surface thereof, and a back layer provided on the opposite surface. The support used in the present invention is preferably transparent from the viewpoint that exposure can be performed from the surface of the support on which the colored photosensitive layer is not provided, but has resistance to a developer and dimensional stability to heat. Any material may be used as long as it is made of, for example, polyolefin such as polypropylene, polyester such as polyethylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate, nylon 6, nylon 6 /
And synthetic resin films such as polyamides, polyesteramides, polycarbonates, polyetherketones, and copolymers and mixtures thereof. In this case, the most preferred is a homopolymer of polyethylene terephthalate, and particularly preferred is a biaxially stretched polyethylene terephthalate film.

[0009] Further, the support used in the present invention may be used at the time of transfer.
Color shift caused by the difference in thermal expansion coefficient between the vertical and horizontal directions
In order to reduce, the maximum coefficient of thermal expansion αtmax is 2.5 ×
10 ^-Five/ ° C or less, or the orientation angle is -20 degrees
It is preferable to select something in the range of +20 degrees
No.

Here, the maximum coefficient of thermal expansion αtmax refers to the largest of the coefficients of thermal expansion αt in any direction at any position on the surface of the support. In the case of a normal 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 a polymer molecule fixed during stretching and crystallization of a film based on its polarization. The orientation angle takes a symmetrical value (only the sign is reversed) 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 edge of the support.

The support may contain inorganic particles such as silica, alumina, kaolin, and talc for improving the handleability. The thickness of the support is not particularly limited, but is preferably 10 to 3 from the viewpoint of mechanical strength and heat conduction during transfer.
It is 00 μm, more preferably 50 to 100 μm.

In the present invention, a release layer is preferably provided between the support and the colored photosensitive layer in order to improve the transferability of the image formed on the support. For the release layer, for example, a vinyl acetate copolymer such as an ethylene-vinyl acetate copolymer, an ethylene-propylene-vinyl acetate copolymer or a modified product thereof, or an ethylene-ethyl acrylate copolymer is used. . Considering transferability, softening point is 5
An ethylene-vinyl acetate copolymer at 0 to 120 ° C is more preferred.

A method for forming a release layer using an ethylene-vinyl acetate copolymer is described in JP-A-3-18194.
No. 7, the coating and drying methods, the dry laminating method, the hot melt laminating method, the co-extrusion method, and the like as described in JP-A-7-No. Further, as a component of the release layer, for example, substances disclosed in JP-A-51-5101, JP-A-59-97140, JP-A-63-2040, such as alcohol-soluble polyamide, alcohol-soluble nylon, and styrene A blend of a partially esterified resin of a copolymer with maleic anhydride and methoxymethylated nylon, a polymer 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
It is 200 μm, more preferably 10 to 100 μm. An adhesive layer containing isocyanate or the like may be provided between the release layer and the support.

The colored photosensitive layer used in the present invention contains at least the photosensitive composition and the coloring agent, and may be a single layer per se, but is not limited thereto. And at least two layers of a photosensitive composition and a photosensitive layer composed of a binder. In this case, either layer may be present on the release layer or the support side. In the following description, a colored photosensitive layer composed of one layer will be mainly described. Therefore, unless otherwise specified, the photosensitive layer means a colored photosensitive layer.

The photosensitive layer contains a photosensitive composition containing a photopolymerizable composition (for a negative photosensitive layer), a quinonediazide compound (for a positive photosensitive composition), a diazo compound / azide compound (for a negative photosensitive composition), and a colorant. It contains. When the photosensitive layer is formed by a photopolymerizable composition, a monomer compound such as a polyfunctional vinyl monomer or a vinylidene compound capable of forming a photopolymer by at least one addition polymerization, and a photopolymerization initiation activated by actinic rays And a thermal polymerization inhibitor, if necessary.

As the vinyl monomer or vinylidene compound that can be used in the photopolymerizable composition, unsaturated esters of polyols, particularly esters of acrylic acid or esters of methacrylic acid are preferred. For example, mention may be made of ethylene glycol diacrylate, polyacrylate, ethylene glycol dimethacrylate, pentaethritol trimethacrylate, pentaerythritol tetramethacrylate, pentaerythritol diacrylate, dipentaerythritol polyacrylate, polyethylene glycol bisacrylate, and bismethacrylate. it can.

The photopolymerization initiator and the thermal polymerization inhibitor are not particularly limited, and known compounds can be used. Examples thereof include aromatic ketones such as benzophenone, benzoin ethers such as benzoin methyl ether, and benzoin ethers such as methylbenzoin. Benzoins, 2,4,5-triacrylyl imidazole dimer, 2- (o-fluorophenyl) -4,5-
And compounds such as imidazole dimers such as diphenylimidazole dimer. Known compounds such as isoamyl p-dimethylaminobenzoate, ethyl p-dimethylaminobenzoate, N-methylethanolamine, bisdiethylaminobenzophenone, and the like can also be used as the photopolymerization accelerator. It is also preferable that these photopolymerization initiators are appropriately mixed and used. Next, as the quinonediazide compound,
For example, an ester compound of o-naphthoquinonediazidesulfonic acid and a novolak resin can be used.

Novolak resins are polycondensation resins of phenols and aldehydes or ketones. Examples of the phenols include phenol, cresol, xylenol, carvacrol, thymol, catechol, resorcin, hydroquinone, pyrogallol, phloroglucin and the like. Aldehydes include formaldehyde, benzaldehyde, acetaldehyde, crotonaldehyde, furfural and the like, and preferred ones are formaldehyde and benzaldehyde. Examples of the ketone include acetone, methyl ethyl ketone, and the like.

Examples of the novolak resin include phenol-formaldehyde resin, m-cresol-formaldehyde resin, m- and p-mixed cresol-formaldehyde resin, resorcinol-benzaldehyde resin, pyrogallol-acetone resin, and JP-A-55-57841. Phenol-cresol-formaldehyde copolycondensation resin described in JP-A-55-127553.
-Copolycondensation resins of substituted phenol and phenol or cresol and formaldehyde.

In the o-naphthoquinonediazide compound, o-
The condensation rate of naphthoquinonediazidesulfonic acid (reaction rate for one hydroxyl group) is preferably from 15 to 80%, more preferably from 20 to 45%. 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 1500 or more, in consideration of coatability.

Among the above o-quinonediazide compounds, condensates of 1,2-naphthoquinonediazidosulfonyl chloride with novolak resins, particularly pyrogallol / acetone condensed resins, metacresol / acetone condensed resins, and 2,3,4-trihydroxy An o-quinonediazide ester compound obtained by reacting benzophenone is most preferred.

As the o-quinonediazide compound used in the present invention, the above compounds may be used alone or in combination of two or more. The preferred amount of the o-quinonediazide compound used is as follows.
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 disclosed in JP-B-47-1167 and JP-B-57-43890.
Water-insoluble and ordinary organic solvent-soluble compounds described in JP-A-2006-163, etc. are used.

Further, as the azide compound, an aromatic diazide compound in which an azide group is bonded to an aromatic ring directly or via a carbonyl group or a sulfonyl group is preferably used. For example, polyazide styrene, polyvinyl-p- as described in U.S. Pat. No. 3,093,311.
Azidobenzate, polyvinyl-p-azidobenzal, a reaction product of an azidoarylsulfonyl chloride described in JP-B-45-9613 with an unsaturated hydrocarbon-based polymer, a polymer having sulfonyl azide or carbonyl azide, etc. No. 43-21017, 44-
Nos. 22954 and 45-24915)
Can be used.

Representative examples of the binder resin used in the photosensitive layer include novolak resin, acrylic resin, vinyl acetate resin, polyurethane resin, epoxy resin and the like. As the novolak resin, those described above are used. As the vinyl acetate resin, a vinyl acetate-vinyl versatate copolymer described in JP-A-3-48248 and JP-A-3-181947 is preferably used.

The photosensitive layer contains an appropriate coloring agent. Dyes and pigments can be used as the colorant. For example, yellow, magenta, cyan, and black pigments and dyes, and other metal powders, white pigments, and fluorescent pigments can be used. Table 1 below provides some examples of the many pigments and dyes known in the art. (CI stands for color index.)

[0026]

Table 1 Table 1 Victoria Pure Blue (C.I. 42595) Auramine (C.I.41000) Catillon Brilliant Flavin (C.I. Basic 13) Rhodamine 6GCP (C.I. 45160) Rhodamine B (C) No. .45170) Safranin OK70: 100 (CI.50240) Erioglaucine X (CI.42080) Fast 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 (CI. 12355) Lionol Red 7B4401 (CI. 15830) Fast Gen Blue TGR-L (CI. 74160) Lionol Blue SM (CI. 26150) Mitsubishi Carbon Black MA-100 ( Mitsubishi Carbon Black # 30, # 40, # 50 (manufactured by Mitsubishi Chemical Corporation) Cyanine Blue 4920 (manufactured by Dainichi Seika) Seika First Carmin 1483 (manufactured by Dainichi Seika) Seika First Yellow H- 7005, 2400 (Dainichi Seikasha)

The amount of the coloring agent 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 preferably 5 to 75% by weight, and in the case of pigments, it is generally preferably 3 to 90% by weight, and more preferably both are 4 to 50%. The thickness of the photosensitive layer depends on the target optical density and the type of coloring agent (dye,
(Pigment, carbon black) and the content thereof, but the thinner the film, the higher the resolution and the better the image quality. Therefore, the film thickness is 0.1 to
Preferably, it is used in the range of 5 μm. In the photosensitive layer, in addition to the above-described materials, a plasticizer, a coating improver, and the like can be further added as necessary.

Examples of the plasticizer include various low molecular weight compounds such as phthalates, triphenyl phosphates, and maleates, and examples of the coating improver include ethyl cellulose and polyalkylene ether. Surfactants such as nonionic surfactants, and fluorinated 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 form a coating solution, and applying this on a release layer. it can.

Examples of usable solvents include ester solvents such as ethyl lactate and ethyl acetate; ketone solvents such as methyl ethyl ketone and cyclohexanone; halogen solvents such as ethylene dichloride and dichloromethane; ethers such as ethylene glycol monomethyl ether and dioxane. A system solvent can be used. Particularly preferred is ethyl lactate or methyl ethyl ketone, or a mixture of these with other solvents.

The coating method for coating these colored photosensitive layers on the release layer includes, 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. These coating methods are techniques that can also be used when forming the back layer.

In the case where a colored photosensitive layer is present as a colored layer and a photosensitive layer, and when a plurality of layers are provided, for example, when an overcoat layer is applied on the colored photosensitive layer, coating and drying may be performed for each layer. Thereafter, a sequential multi-layer coating method of winding, a method of arranging a large number of coaters and driers side by side on one line, and providing a plurality of layers by one transfer of the support (for example,
-69574) or the like can be used.

Drying is performed by, for example, blowing heated air onto the coating surface. Heating temperature is 30 ~ 200
C is preferred, and a range of 40 to 140 C is particularly preferred. In the invention, an overcoat layer may be provided on the colored photosensitive layer. The overcoat layer is provided to prevent the attachment of dust and the like to the colored photosensitive layer, or to protect the colored photosensitive layer from damage, or to prevent the influence of oxygen when the colored photosensitive layer contains a photopolymerizable substance. is there. The overcoat layer is made of a material that can be dissolved or swelled in a commonly used developer, and may further contain an ultraviolet absorber and a release agent.

Materials used for the overcoat layer include polyvinyl alcohol, polyethylene oxide,
Polyacrylic acid, polyacrylamide, polyvinyl methyl ether, polyvinyl pyrrolidone, polyamide, gum arabic, glue, gelatin, casein, celluloses (eg, viscose, methyl cellulose, ethyl cellulose, hydroxyethyl cellulose, hydroxypropyl methyl cellulose, carboxymethyl cellulose, etc.), starch And the like.

As the ultraviolet absorber which may be contained in the overcoat layer, known ones can be used without any limitation as long as they do not adversely affect the developing property and the coating property. Typical examples include stilbene-based, salicylic-acid-based, benzophenone-based, benzotriazole-based, and cyanoacrylate-based ultraviolet absorbers. These ultraviolet absorbers may be used alone or in combination of two or more. The amount of the ultraviolet absorber to be added is selected in consideration of the light source used, the absorption wavelength and the absorption intensity of the photoreceptor, and the preferable range of the amount is 1 to 1 m2.
To 500 mg, particularly preferably 20 to 200 mg.
Range.

In the present invention, a protective film may be laminated on the colored photosensitive layer directly or via an overcoat layer. The protective film is provided for protecting the surface properties of the colored photosensitive layer and / or 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 include the same as the above-mentioned support. In this case, the film thickness is 1 to 200 μm.
m, preferably in the range of 5 to 100 μm.

The back layer of the invention is provided on the surface of the support of the colored image forming material opposite to the colored photosensitive layer, and contains substantially spherical particles. The back layer may further contain an antistatic agent and a binder resin. As described above, this is to prevent adhesion between image forming materials during storage,
Prevention of peeling electrification when taking only one sheet, prevention of blocking each other when a plurality of sheets are stacked before being transferred to a material to be transferred in a state where a colored image is formed on a support after the development process, etc. It is provided for the purpose. It also effectively contributes to prevention of peeling charging.

Basically, by using roughly spherical particles,
1. 1. reducing the surface contact area; The two effects of reducing friction reduce the occurrence of frictional charging and peeling charging. Further, by decreasing the surface specific resistance value by using an antistatic agent, the decay rate is increased and the charge is prevented. More effective results can be obtained when both are present. The term “approximately spherical” in the present invention means that the surface of the particle is constituted by a curved surface, and that there is no sharp portion. Therefore,
Instead of being truly spherical, it may be, for example, a long ball type, a rugby ball type, or the like. If the particles have a sharp portion, when the image forming materials are stacked for storage or transportation, the surface of the other image forming material may be damaged, which is not suitable.

As the roughly spherical particles, organic polymer fine particles,
Although inorganic oxide fine particles and the like can be used, as the organic polymer fine particles, for example, fine particles of polyolefin resin, styrene resin, urea formaldehyde resin, benzoguanamine resin, acrylic resin, isoprene resin, silicone resin, fluorine resin, etc. Examples of the inorganic oxide fine particles include silica, talc, alumina, calcium carbonate, barium sulfate, and titanium oxide. If these roughly spherical particles are extremely hard, it may be difficult to obtain the effect of preventing abrasion due to close contact during storage or the effect of suppressing blocking before transfer, so that organic polymer fine particles having some softness are preferred.

The average particle size of such particles is 0.5 to 1
A range of 00 μm is preferable, and a range of 1 to 30 μm is more preferable. More preferably, it is in the range of 3 to 10 μm. If the particle size is too large, poor adhesion to the color separation netting film during exposure, or when the colored image forming materials are overlaid on each other, the particle powder is pressed by applying a partial strong pressure to the colored photosensitive layer. It causes defects such as marks. On the other hand, if the particle size is too small, the anti-blocking performance becomes insufficient.

The spherical particles are more preferably spherical particles. Here, the true spherical shape means, specifically, when the shortest diameter (Ds) and the longest diameter (Dl) are measured for 100 randomly extracted particles, the ratio (Ds / Dl) of the values is measured. Is defined as sphericity, which means that the measured sphericity of 90% or more of the particles is 0.9 or more. Further, it is preferable that the particles have a true spherical shape and the particle size distribution of the particles is narrow. Since the projections formed by such particles have a uniform shape and height, the coefficient of friction, pressure, and the like do not fluctuate at a specific location, and become constant. Therefore, defects such as scratches and pressed marks are less likely to occur.

Some commercially available particles claim to be truly spherical. For example, Techpolymer MB, MB-
S (acrylic resin, manufactured by Sekisui Plastics), MX-30
0, MX-500, MX-1000, MX-1500,
MP-1400 (acrylic resin, manufactured by Soken Chemical Co., Ltd.), Julimer MB-1 (acrylic resin, Nippon Pure Chemical), Tospearl 120, Tospearl 130, Tospearl 240 (silicone resin, manufactured by Toshiba Silicone Co., Ltd.), PB-200C, PB-200D (divinylbenzene resin, manufactured by Kao Corporation), R930 (silicone resin, manufactured by Dow Corning Toray Silicone Co., Ltd.),
Micropearl SP (divinylbenzene resin, manufactured by Sekisui Fine Chemical Co., Ltd.) and the like can be used, and these are preferably used, but not limited thereto.

Further, the particles are preferably transparent particles. This is because the colored image forming material may be exposed from the side of the back layer, and if the transparency of the back layer is low, light is blocked and the sensitivity is affected. Highly transparent particles not only do not themselves absorb light,
Particles that do not scatter. Therefore, particles having few cracks and pores in the particles are preferable. Specifically, the specific surface area is 200 m ² / g or less, preferably 50 m ² / g
Or less, more preferably 10 m ² / g or less. The specific surface area of the particles having no cracks or pores in the particles is a true spherical particle having a specific gravity of 1 and a radius of 5 μm, and is calculated to be about 1.2 m ² / g. Since the problem of the decrease in transparency due to the particles is related to the amount of the particles used, if the amount is small, the use of particles having a certain specific surface area is acceptable. However, in order to obtain the best performance, it is preferable to use particles having a specific surface area as small as possible.

The back layer of the present invention may contain an antistatic agent for the purpose of suppressing the generation of static electricity and quickly releasing the generated static electricity. The antistatic agent is not particularly limited as long as it has an effect of suppressing generation of static electricity, and any one can be used.
For example, a cationic surfactant, an amphoteric ionic surfactant, an anionic surfactant, a nonionic surfactant, or a conductive resin can be used. Alternatively, a polymer material having an antistatic function can be used. In addition,
Specific examples of such an antistatic agent include the following. That is, a tetraalkylammonium salt, a trialkylbenzylammonium salt as a cationic type, an alkylbedaine type, an alkylimidazolium betaine type, an alkylalanine type as a zwitterionic type, an alkyl sulfonate, an alkylbenzesulfonic acid as an anionic type Salts, alkyl phosphates, non-ionic types include polyoxyethylene alkylamine, polyoxyethylene alkylamide, polyoxyethylene alkyl ether, polyoxyethylene alkyl phenyl ether, glycerin fatty acid ester, sorbitan fatty acid ester, and conductive resin Examples thereof include a polyvinylbenzyl type cation and a polyacrylic acid type cation.

Among these, cationic surfactants and zwitterionic surfactants are preferred because of their good adhesion to synthetic resin films suitable as supports, and more preferred are cationic surfactants. Among the cationic surfactants, acrylate derivatives, amide amide derivatives, vinyl ether derivatives, and vinyl pyridine derivative compounds having substituents such as tetraalkylammonium salts and trialkylbenzylammonium salts are preferable. Acrylic compounds such as ester derivatives and acrylamide derivatives are preferred. The larger the molecular weight, the better the adsorptivity to the surface of the support and the lower the permeation into the support. Thus, the molecular weight is preferably 1,000 or more, more preferably 5,000 or more. These antistatic agents can be used in appropriate combination.

A conductive resin can also be used as an antistatic agent. For example, polyvinylbenzyl-type cations and polyacrylic-acid-type cations are mentioned as examples. These can also be dissolved or dispersed in a solvent and applied and dried to obtain a surface having antistatic ability. The formation of the back layer containing the roughly spherical particles and the antistatic agent is performed by mixing the antistatic agent and the particles with the solvent, heating, stirring, and dispersing as necessary, and applying and drying the obtained composition. It can be said that obtaining the back layer is the simplest and preferable.

The surface of the obtained back layer must have protrusions (hereinafter simply referred to as protrusions) whose surfaces are smooth curved surfaces due to particles. The reason is that when a surface with a protrusion due to particles is superimposed on another surface, it comes into contact only with the protrusion, so that triboelectric charging is reduced and the coefficient of friction is further reduced compared to when the entire surface is in contact. This can be expected to reduce the adhesion and the adhesion, so that blocking and peeling charge can be reduced. On the other hand, since a force is applied only to the projection, factors such as the shape, size, hardness, and number of the projection need to be sufficiently examined. In order to form protrusions by particles on the back layer, the particles must be out of the reference coating surface of the back layer. On the other hand, in order to ensure that the height of the unevenness due to the particles is uniform and to ensure transparency, the particles need to be in a monodispersed state (a state in which each particle is separated). Therefore,
Assuming that the height of the reference coating surface of the back layer (the thickness of the back layer) is t, the diameter of the particles needs to be at least t or more. Further, in order to obtain effective projections, the size of the particles is preferably 2t or more. Further, if the diameter of the particles is significantly larger than the thickness of the back layer, the particles may be easily detached from the back layer. Therefore, the diameter is preferably 30 t or less, more preferably 20 t or less.

The thickness of the back layer is not limited as long as it can provide projections of roughly spherical particles and antistatic properties of an antistatic agent, but from 0.1 μm to 2 μm is appropriate from the viewpoint of coating properties and transparency. . When the thickness of the back layer is directly measured, the size of the particles may be measured. Therefore, the thickness of the back layer as a reference surface of the coating is calculated from the coating amount and the specific gravity, or SEM.
It is desirable to measure by observation at the same time. The particles in the back layer must be well adhered. For example, if the operator touches the particles or the particles fall off during the development process, not only the sufficient effect cannot be expected, but also the contamination by the dropped particles must be concerned. Therefore, it is necessary that the back layer contains a substance having an effect of adhering the particles to the support. In this, an antistatic agent may fulfill its role, or a binder resin may be used.

In general, since the antistatic agent has a low Tg, there is a possibility that high temperatures during transportation may contaminate or fuse other substances. Further, in general, the mechanical strength is weak, and the adhesive strength of the particles may be insufficient. Even in that case, the disadvantage can be compensated for by using a binder resin. As the binder resin, for example, an acrylic resin, a polyester resin, a urethane resin or the like can be used. Among them, Tg is 50 ° C. or more, preferably 70 ° C. or more.

Further, in consideration of exposure from the side of the back layer, the back layer must be excellent in transparency. Therefore, it is preferable that the materials constituting the back layer have a refractive index close to each other, and if the materials are soluble, a combination of compatible materials is preferable. In general, when a binder resin is used, it is preferable that the binder resin and the antistatic agent be the same type of compound, since the same type of compound satisfies these requirements. For example, both are an acrylic compound and a polyester type. Preferred combinations are compounds, urethane compounds and vinyl compounds. Acrylic resin is a material whose transparency is known. Therefore, when an antistatic agent and a binder resin are used, both are preferably acrylic. Since the antistatic agent has a hydrophilic substituent for imparting antistatic properties, it can be said that the antistatic agent is a substance having high polarity. Therefore, a resin having high polarity is also preferable for a resin having good compatibility with the resin, and one of the standards is that the resin is soluble in an alcohol-based solvent.

The colored image forming material of the present invention may undergo a step of developing the colored photosensitive layer with a liquid developer depending on the method of use. In this case, the back layer must maintain its performance even after the development until the developed colored image forming materials of four colors are transferred to the receiving paper. In such a use method, a material which is eluted in the developer and deteriorates in performance is not preferable. Since the developer is water-based, the back layer needs to have so-called water resistance, and it is preferable that the material itself be a water-insoluble material. Alternatively, a material that becomes water-insoluble after forming the back layer may be used.For example, a material that is cross-linked and cured using a curing agent such as isocyanate, becomes water-insoluble, and is dried with a water-dispersible resin. There are substances that become water-insoluble materials. Most preferably, the substantially spherical particles, the antistatic agent and the binder are all water-insoluble. In that case, a preferable back layer can be obtained only by coating and drying. It is preferable to dissolve the antistatic agent and the binder resin in a non-aqueous solvent, and disperse the substantially spherical particles in the solvent to obtain a back layer coating liquid.

The amount of the particles used is 10 to 100,000 particles /
mm ² is appropriate. If the amount is less than this range, blocking cannot be sufficiently prevented. If the amount is too large, the number of contact points increases too much, and the effect of preventing blocking decreases. The number of projections can be calculated by observing the surface with a scanning electron microscope or an optical microscope and counting the number of particles having a predetermined area, thereby calculating the number per 1 mm ² of the sheet area. The amount of the antistatic agent used is 1% to 100% of the total amount of particles removed from the entire back layer, and preferably 2% to 70%.
%.

As described above, the back layer is preferably formed by applying and drying a coating solution obtained by mixing an antistatic agent and roughly spherical particles in a solvent. The solvent is not particularly limited, and ordinary solvents can be suitably used. In order to obtain a uniform and transparent back layer, it is preferable to select a solvent composition that uniformly dissolves a composition such as an antistatic agent.
In addition, in order for the substantially spherical particles to be monodispersed in the back layer, the particles must be monodispersed (in a state where each particle is separated and dispersed) in the coating liquid. Therefore, it is necessary to disperse the liquid through a disperser. To determine whether it is monodispersed, take out part of the liquid and apply it,
It can be determined by microscopic observation. Spherical particles are easier to monodisperse than amorphous particles, and are preferred in that respect. On the other hand, spherical particles having a uniform particle diameter can easily take a densely packed structure when the coating liquid is allowed to stand when the coating liquid is allowed to settle. May not be monodisperse. In order to prevent such agglomeration, it is effective to add fine particles having a particle diameter of about 1% by weight or more to the spherical particles.

The image forming method using the image forming material of the present invention will be described below using an example of a multicolor image using four colors, but the present invention is not limited to this example. That is, first, the color separation screen 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, an ultra-high pressure mercury lamp, a metal halide lamp, a tungsten lamp, a xenon lamp, a fluorescent lamp and the like are used. Similarly, the same is performed for the other three colors. Next, each of the exposed materials is liquid-developed with a developer, washed with water and dried to form an image area. In this case, the back layer needs to have water resistance. As another developing method, for example, JP-A-2-269
As described in JP-A-349-349, an image portion can be formed by using a method of performing peeling development by peeling a cover sheet instead of liquid development with a developing solution. In this case, the back layer may not have water resistance.

Next, after forming an image portion by exposure and development as described above, the formed image portion is transferred to a material to be transferred to obtain a transfer image. In this case, it is preferable to adopt a format in which only the formed image portion is transferred, since the transferred image becomes very close to the printed matter. That is, a first color image is formed on the first color image forming material, and at least the color image is transferred to a material to be transferred, and the support is released. Further, after forming the second color image on the second color image forming material, the second color image formed thereby is registered on the 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 (if necessary, more images) are transferred onto the same transfer-receiving material, and a multicolor image is obtained. In some cases, the multicolor image may be indirectly transferred onto another transfer-receiving material to obtain a final multicolor image. This type of method is disclosed in Japanese Patent Application Laid-Open No. 47-41830.
JP, JP-A-59-97140, JP-A-60-2364
9 and US Pat. No. 3,775,113. At this time, it is possible to adopt a mode in which only the image portion is directly transferred and laminated on the material to be transferred from the image obtained on the support. That is, it is preferable that substantially only the image layer for forming an image is transferred and laminated.

The transfer method is described in JP-A-3-120.
It is also preferable to employ the method described in JP-A-552-552. In this case, substantially only the image layer for forming an image is transferred and laminated, and the image is directly transferred to the paper, so that the number of transfer steps is reduced by one compared with the indirect transfer method.
As a result, the work time is shortened, and since the adhesive image receiving sheet used for indirect transfer is not used, the work at the time of aligning the image receiving sheet with the support on which the image is formed is easy, so that the workability is improved. Is particularly preferred.

It is general to apply heat and / or pressure during transfer. The temperature and pressure at this time greatly vary depending on the layer constitution and the components constituting each layer. Usually, the temperature is from room temperature to 140 ° C. and the pressure is from 0 to 20 kg / cm ^2.
C. and a pressure in the range of 3 to 10 kg / cm ² are preferable. 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 used. Further, the method described in JP-A-3-120552 is also preferably used.

Various methods can be used for the registration (registration). For example, by fixing the image by adhering the support after image formation on the adhesive support, a method for preventing displacement and using the pin holes used to adhere the color separation original at the time of exposure, the register pin This is a method of performing registration using a bar. The former is JP-A-6
As described in JP-A-3-78788 and JP-A-2-19148, the present invention preferably employs the latter method using a register pin bar. As the image receiving material, high-quality paper, art paper, paper such as coated paper, polyester film, plastic film or intermediate layer such as acetate film, plastic film coated with the image receiving layer, aluminum foil, metal foil such as copper foil, or These composite materials are used.

The image forming method of the present invention is carried out as follows using the above-mentioned image forming material. First, on the support of the colored image forming material, on the opposite side of the photosensitive layer, that is, on the back side of the support, a decomposition mask is arranged, and an actinic ray is irradiated thereon, and the image is exposed. There is a method in which an image is exposed by irradiating an actinic ray from above on a decomposition mask. The above exposure method can be appropriately selected. This is performed for the required number of colors (usually for four colors).

Next, each exposed material is liquid-developed with a developer, washed with water, and dried. The first color is superimposed on the transfer surface of the image receiving material, and the image is transferred to the image receiving material side. Release the body to obtain a transfer image of the first color. This is also performed for the remaining number of colors, and the transfer is performed while stacking the layers to obtain a final color proof. At the time of the transfer, heat and pressure are generally applied. A transfer device preferably used is disclosed in
As described in JP-A-5101 and JP-A-3-120551, paper and an image are transferred by being pressed between heating rollers. Examples of the image receiving material include high-quality paper, art paper, coated paper, paper such as newsprint, plastic films such as polyester film, acetate film, and polypropylene fimur, and metals such as aluminum foil and copper foil. A foil or a composite material thereof is used.

[0060]

EXAMPLES The present invention will be described more specifically with reference to the following examples, but the present invention is not limited to the following examples. The present embodiment is a case where the photosensitive composition of the invention described in the claims is applied to an image forming material and used.
In particular, it is embodied as a color proof. Unless otherwise specified, the working environment was performed at a temperature of 23 ° C. ± 2 ° C. and a humidity of 30% ± 10%.

Example 1 (1) Preparation of Support An ethylene-vinyl acetate copolymer resin (EVAFLEX manufactured by Du Pont-Mitsui Polychemicals Co., Ltd.) was placed on a biaxially stretched polyethylene terephthalate film (70 cm in width) having a thickness of 75 μm.
P-1405: vinyl acetate content 14% by weight, VICA
(T softening point: 68 ° C.), and a release layer having a thickness of 30 μm was formed by extrusion lamination to obtain a support. (2) Formation of Back Layer MX-500 (trade name, manufactured by Soken Kagaku Co., Ltd., spherical particles of acrylic resin, average particle size of 5 μm, on the surface opposite to the release layer of the polyethylene terephthalate film with a release layer, ratio surface area 5 m ² / g or less) 0.2 parts by weight, Safutoma ST2
500 (trade name, manufactured by Mitsubishi Chemical Corporation, cationic antistatic agent, water-insoluble, acrylic compound, solid content 34%)
17.3 parts by weight, 12.5 parts by weight of Dianal BR-80 (trade name, manufactured by Mitsubishi Rayon Co., Ltd., binder resin, water-insoluble, acrylic compound), 70.0 parts by weight of 2-butanone (solvent) The back layer coating solution obtained by heating, mixing and dispersing was applied using a bar coater and dried to prepare a support having a back layer with a coating weight of 1.0 g / m ² . The coating thickness t in this case was about 1 μm.

The spherical particle MX-500 used had an average particle size of 5 μm, and the particles were observed by a scanning electron microscope (SEM) before use.
%, And 90% or more of the particles were spherical particles. The result of observing the coated surface with a microscope or SEM
The particles were in a monodispersed state, projecting more than half from the coating surface, and the protruding end of the protrusion was rounded. Also, the number of protrusions due to the particles was between 200 and 600 per square millimeter. The surface resistivity of this back layer was 1 × 10 ⁸ Ω / □.

(3) Coating of photosensitive layer A photosensitive solution having the following composition is coated on the above-mentioned support using a bar coater and dried to obtain a negative color image forming material of four colors having a dry film thickness of 1.5 μm. It was created. (Photosensitive solution) Vinyl acetate-vinyl versatate copolymer (80: 20 wt%, weight average molecular weight 150,000, 50% methanol solution) 10 parts by weight Pentaerythritol tetraacrylate 6 parts by weight 2,4-diethylthioxanthone 1.2 Parts by weight 4-dimethylaminobenzoic acid ethyl ester 1.2 parts by weight 2,2'-bis (orthochlorophenyl) -4,5,4 ', 5'-tetraphenyl-1,2'-biimidazole 0.5 part by weight Parts paramethoxyphenol 0.2 parts by weight 2-butanone 64 parts by weight Pigment selected from the following Black: carbon black MA-100 (manufactured by Mitsubishi Chemical Corporation) 1.65 parts by weight cyan: cyanine blue 4920 (manufactured by Dainichi Seika) 1.2 parts by weight Magenta: Seika First Carmine 1483 (manufactured by Dainichi Seika) 2.5 parts by weight Yellow: Seika Fur Door yellow 2400 (Dainichiseika Color & Chemicals Mfg. Co., Ltd.) 1.65 parts by weight

(4) Completion of colored image forming material A biaxially stretched polyethylene terephthalate film (70 cm in width) having a thickness of 25 μm was coated with an overcoat layer solution having the following composition using a bar coater to a dry film thickness of 0.5 μm. It was applied and dried. The film with the protective layer and the above-mentioned film coated with the photosensitive layer were overlapped so that the coated surfaces faced each other, and were laminated under pressure using a laminator to obtain a colored image forming material. (Protective layer) Polyvinyl alcohol (GL-05, manufactured by Nippon Synthetic Chemical Industry Co., Ltd.) 3.5 parts by weight 97 parts by weight of demineralized water 3 parts by weight of methanol

(5) Evaluation of Charging Property and Scratch Property Two pieces of the image forming material prepared in (4) were cut out to an appropriate size, and the back surface and the opposite surface were overlapped. 1 kg / dm ² load
After rubbing 0 times, there was no sticking between the image forming materials and no damage to the surface. (6) Transfer image forming method The colored image forming material of four colors prepared in (4) is 910 mm ×
Cut out to a size of 620 mm, superimpose A1 size color separation net positive films of each color on the polyethylene terephthalate film surface, and use a 4 kW metal halide lamp to
After performing image exposure for 40 seconds from a distance of 00 cm, and further peeling the biaxially stretched polyethylene terephthalate film having a thickness of 25 μm from the colored image forming material, by immersing in a developing solution described below at 32 ° C. for 30 seconds, development was performed. After washing with water, four colored images were formed.

(Developer) Sodium silicate 25 g Sodium hydroxide 5 g Surfactant (Kao Corporation Perex NBL) 250 g Demineralized water 1000 g

(7) Evaluation of Blocking Suitability and Charging Property The above-described color sheet having a colored image formed on a support was subjected to black, cyan, magenta and yellow color printing from the bottom so that the colored photosensitive layer faced upward. Four sheets were stacked in this order and left at room temperature for 1 hour. As a result, in all of black and cyan, cyan and magenta, and magenta and yellow, any sticking, blocking, and missing of an image occur between the formed image (colored photosensitive layer) and the support of the color sheet thereon. I couldn't see it. The surface resistivity of the back layer is 1
× 10 ⁹ Ω / □, slightly poor.

(8) Evaluation of misregistration Thereafter, using the processing apparatus described in US Pat. No. 5,068,689, a four-color image is formed on special diamond art paper (thickness: 127.9 g / cm ² ) having a size of 636 mm × 939 mm. Let
As a result of observing the most shifted position between the four colors using a microscope of 100 times, the position shift was 50 μm.

Example 2 The same test as in Example 1 was conducted except that the amount of MX-500 in the back layer in Example 1 was doubled. The results were the same as in Example 1. The number of protrusions due to the particles was almost twice that of Example 1.

Example 3 The amount of MX-500 in the back layer in Example 1 was reduced by half.
The same test as in Example 1 was performed, except that The results were the same as in Example 1. The number of protrusions due to the particles was almost half that of Example 1.

Embodiment 4 In place of the back layer MX-500 in Embodiment 1, M
X-300 (trade name, manufactured by Soken Chemical Co., Ltd., spherical particles of acrylic resin, average particle diameter of 3 μm, specific surface area of 5 m ² / g or less), and the coating amount of the back layer was set to 0.8 g / m ^2. Was tested in the same manner as in Example 1. The coating thickness t is about 0.8 μm
It is. The results were the same as in Example 1. MX-3
No. 00 has an average particle size of 3 μm, and the particles are SE
As a result of observation with M, the particles were true spherical particles in which 90% or more of the particles existed within ± 10% of the average particle diameter.
Observation of the coated surface with a microscope or SEM showed that the particles were in a monodispersed state and protruded more than half from the coated surface, and the protruding tip of the protrusion was rounded. The number of protrusions by the particles is 500 to 500 square millimeters.
It was between 2000.

[0072]Example 5 Instead of BR-80 of the back layer in the first embodiment, BR
-100 (trade name, Mitsubishi Rayon Co., Ltd., binder
Resin, water-insoluble, acrylic compounds)
The test was performed in the same manner as in Example 1. The results are similar to those of Example 1.
It was similar. Example 6 Instead of BR-80 of the back layer in the first embodiment, BR
-100, MX-500 instead of 0.2 parts by weight
To Micropearl SP207 (trade name, Sekisui Fine Chem
Cal Co., Ltd., divinylbenzene resin spherical particles, flat
Uniform particle size 7μm, specific surface area 5m^Two/ g or less) 0.4 parts by weight
A test was performed in the same manner as in Example 1 except that the test was used. as a result
Was the same as in Example 1.

Micropearl SP207 has an average particle size of 7
As a result of observing the particles by SEM before use, the particles were true spherical particles in which 90% or more of the particles existed within ± 10% of the average particle size. Use a microscope or S
As a result of observation by EM, the particles were in a monodispersed state, projecting more than half from the coating surface, and the shape of the protruding end of the protrusion was rounded. The number of protrusions by the particle is 1
Between 50 and 200 pieces per square millimeter.

Example 7 Tospearl 240 (trade name, manufactured by Toshiba Silicone Co., Ltd., silicone resin, spherical particles having an average particle diameter of 4 μm, specific surface area of 20 to 4) was used instead of MX-500 in Example 2.
0m ² / g), and BR-100 is used instead of BR-80.
The test was performed in the same manner as in Example 1 except that was used. The back layer was slightly more opaque than Example 2, but the test results were the same as Example 2. Tospearl 240 has an average particle size of 4μ.
m, and as a result of observing the particles by SEM before use,
It was a true spherical particle in which 90% or more of the particles existed within ± 10% of the average particle size. Use a microscope or SEM
As a result, the particles were monodispersed and protruded more than half from the coating surface, and the protruding end of the protrusion was rounded. The number of protrusions by the particles was between 500 and 2000 per square millimeter.

Example 8 In place of ST-2500 in Example 1, SAFTMER ST1200 (trade name, manufactured by Mitsubishi Chemical Corporation, zwitterionic antistatic agent, water-soluble, acrylic compound, solid content 40%) was used. A test was performed in the same manner as in Example 1 except that BR-100 was used instead of BR-80. As a result, the specific resistance of the surface was 1 × 10 ⁸ Ω / □. In addition, the results of the evaluation of the charging property and the scratching property of (5) were also good. However, in the evaluation of (7) blocking suitability and chargeability, film sticking was observed. The surface resistivity of the back layer was increased to 1 × 10 ¹⁰ Ω / m ² . Also,
The back layer became slightly opaque. This is probably because ST1200 was partially dissolved in the developer. In the color shift evaluation of (8), a color shift of about 100 μm was observed. Therefore, it can be said that the formulation of this back layer should be used in an image forming method that does not use a liquid developer.

Example 9 A test was conducted in the same manner as in Example 1 except that BR-80 in Example 1 was not used. As a result, the specific resistance of the surface was 1 × 10 ⁷ Ω / □. (5) The evaluation of chargeability and damageability was good. In the evaluation of blocking suitability and chargeability of (7), good results were also shown, and the surface specific resistance of the back layer was 1 × 10 ⁹ Ω / □. The rise in the surface resistivity was thought to be due to a decrease in mechanical strength due to the removal of the binder resin, and some of the back layer had fallen off.
It is enough as an absolute value. The color misregistration evaluation of (8) was equivalent to that of Example 1.

Example 10 A test was conducted in the same manner as in Example 1 except that the back layer ST2500 in Example 1 was not used. As a result, the specific resistance of the surface was 1 × 10 ¹³ Ω / □ or more,
The generation of static electricity was very small, and as a result of the evaluation of the charging property and the scratching property in (5), sticking was slightly observed. Other test items showed results close to those of Example 1. The results show that the spherical particles have a large effect of reducing the contact area and the friction coefficient, but some static electricity generation was observed because the surface resistivity was not reduced.

Example 11 A test was conducted in the same manner as in Example 1 except that the following photosensitive solution was used instead of the photosensitive solution in Example 1. The test results were the same as in Example 2. (Photosensitive solution) 1,2-naphthoquinonediazide-4-sulfone-p-cresol-formalin ester polymer 2.4 parts by weight Vinyl acetate-vinyl versatate copolymer (80: 20 wt%, weight average molecular weight 150,000, 50% methanol solution) 16 parts by weight Cyclohexanone 72 parts by weight Pigment selected from the following Black: carbon black MA-100 (manufactured by Mitsubishi Chemical Corporation) 1.8 parts by weight Cyan: cyanine blue 4920 (manufactured by Dainichi Seika) 1.1 Parts by weight Magenta: Seika First Carmine 1483 (manufactured by Dainichi Seika) 1.1 parts by weight Yellow: Seika First Yellow 2400 (manufactured by Dainichi Seika) 1.1 parts by weight

Comparative Example 1 A colored image forming material was prepared and evaluated in the same manner as in Example 1 except that the back coat liquid was not applied at all in the preparation of the support of Example 1. As a result of the evaluation of the charging property and the scratching property of (5), sticking was observed. In the evaluation of blocking suitability and chargeability of (7), image sticking was observed between the formed image and the support of another color sheet, and when the color sheet was separated into the original four sheets, the colored image was partially spotted. Was transferred to another support. In the evaluation of the positional deviation in (8), static electricity was generated during the image transfer step and the image was stuck to the transfer device, and the magnitude of the positional deviation was 190 μm. In addition, in each of the steps of exposure, development, and transfer, an electric shock due to static electricity was generated, and the operation was difficult.
In addition, the surface specific resistance value of the back surface was 1 × 10 ¹⁴ Ω / □ or more.

Comparative Example 2 A test was performed in the same manner as in Example 1 except that the back layer MX-500 in Example 1 was not used. As a result, although the surface specific resistance was 1 × 10 ⁸ Ω / □, the coefficient of friction was large, and adhesion occurred in the rubbing in the evaluation of the charging property and the scratching property in (5). This is presumably because the effect of preventing static electricity due to the particles is more effective than the effect of the antistatic agent that rapidly attenuates the generated static electricity. Further, in the evaluation of blocking suitability and charging property of (7), sticking between the supports and blocking were observed.

Comparative Example 3 A test was conducted in the same manner as in Example 1 except that the amount of MX-500 used in Example 1 was reduced to one-fifth and the coating amount of the back layer was increased five times. The test results were equivalent to Comparative Example 2. Observation of the coated surface with a microscope or SEM showed that the particles were in a monodispersed state, but hardly protruded from the coated surface. This is because the diameter t of the particles is not larger than the thickness t of the back layer. As a result, the surface resistivity is
Although it was 1 × 10 ⁷ Ω / □, the coefficient of friction was large, and adhesion occurred in the rubbing in the evaluation of the charging property and the scratching property in (5).

[0082]

When the colored image forming material and the transferred image forming method of the present invention are applied to, for example, a color proof, the blocking is prevented and the displacement at the time of transfer is suppressed, so that good transferability is provided. .

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification number Agency reference number FI Technical display location G03F 7/30 G03F 7/30 7/34 7/34

Claims (14)

[Claims] 1. A colored image forming material comprising a support provided with a colored photosensitive layer containing a photosensitive composition and a colorant on one surface and a back layer on the other surface. A colored image-forming material comprising substantially spherical particles having an average diameter of t or more, where t is the thickness of the layer. 2. The colored image forming material according to claim 1, wherein the diameter of the substantially spherical particles is 2t or more. 3. The colored image forming apparatus according to claim 1, wherein the thickness of the back layer is 0.1 to 2 μm, and the average particle size of the substantially spherical particles is 3 to 10 μm. material. 4. The colored image forming material according to claim 1, wherein the specific surface area of the substantially spherical particles is 200 m ² / g or less. 5. The colored image forming material according to claim 1, wherein the back layer contains an antistatic agent. 6. The colored image forming material according to claim 5, wherein the antistatic agent is a cationic or amphoteric antistatic agent. 7. The colored image forming material according to claim 5, wherein the antistatic agent is water-insoluble or becomes water-insoluble after the back layer is formed. 8. The colored image forming material according to claim 1, wherein the back layer contains a binder resin. 9. The colored image forming material according to claim 8, wherein the binder resin is water-insoluble or becomes water-insoluble after the back layer is formed. 10. The colored image forming material according to claim 5, wherein the antistatic agent and the binder resin are compounds of the same system. 11. The method according to claim 5, wherein the antistatic agent, the binder resin and the substantially spherical particles are compounds of the same system.
10. The colored image forming material according to any one of items 1 to 9. 12. The colored image forming material according to claim 10, wherein the antistatic agent and the binder resin of the back layer are both acrylic compounds. 13. The method according to claim 1, wherein the back layer is formed by adding an antistatic agent or a solvent to the solvent.
13. A solution obtained by dissolving an antistatic agent and a binder resin and monodispersing roughly spherical particles in the solution, and applying and drying the solution on a support.
The colored image forming material as described above. 14. A colored image forming material according to claim 1, wherein the colored image forming material is exposed to an image, and a colored image is formed on a support by a developing process using an aqueous developing solution. A transfer image forming method, wherein a transfer image is obtained by transferring the image to a substrate.