JPH0743898A - Image forming material - Google Patents

Abstract

PURPOSE:To form an excellent image very similar to printed matters by forming a vinylacetate based copolymer containing releasing layer and a colored photosensitive layer on a transparent supporting body specified in the maximum coefficient of thermal expansion in a film intra-plane direction to eliminate the positional deviation or color sllipage of the image. CONSTITUTION:The vinyl acetate based copolymer containing releasing layer and the colored photosensitive layer are formed on the transparent supporting body having <=2.5X10<-5>/ deg.C maximum coefficient of thermal expansion alphatmax in film intra-plane direction. In this case, if a higher precision image is desired, the supporting body smaller in both of alphatmax and orientation angle is preferably selected. Where, the maximum coefficient of thermal expansion alphatmax expresses the maximum value among coefficients of thermal expansion in all positions and every direction on the plane of the supporting body. The supporting body is obtained, for instance, by conducting sequential biaxial orientation or simultaneous biaxial orientation with the same magnification in both vertical and horizontal orientation in the same temp. condition and after that, conducting heat treatment.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION This invention relates to imaging materials suitable for making color proofs. More specifically, the present invention relates to an image forming material capable of obtaining an image with a small positional deviation when a plurality of transferred images are laminated to form a single image, and particularly when a multicolor image is created.

[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 a color proof is produced using an image forming material, a method of aligning with a register has been widely used. According to this method, it is difficult to always obtain stable accuracy while requiring skill. Therefore, there is known a method of performing registration with stable accuracy by using a register pin bar. However, even if the register pin bar is used, there is some variation in accuracy, and sometimes a color shift that can be visually detected occurs, which is a problem. It has been found that such a problem particularly occurs when an image forming material having a release layer on a support is used.

Therefore, the present inventors have found that the orientation angle is −20.
We proposed a method to solve this problem by using a transparent support in the range of + 20 ° to + 20 °.
31397).

[0005]

However, as a result of intensive investigations by the present inventors to further advance this image-forming material, the present inventors have found that the maximum thermal expansion coefficient αtma in the in-plane direction of the film.
By selectively using a transparent support having x of 2.5 × 10 ⁻⁵ / ° C. or less, a good image can be obtained without causing a positional shift or a color shift, and only a specific portion such as a polyester sheet is used as a support. The present invention has been accomplished by finding that the image forming material is an industrially advantageous image forming material that is not selectively used.

[0006]

The summary of the present invention is as follows.
The maximum thermal expansion coefficient αtmax in the in-plane direction of the film is 2.5
The image forming material is characterized in that a vinyl acetate copolymer-containing release layer and a colored photosensitive layer are formed on a transparent support having a temperature of x10 ^-5 / ° C or less.

The present invention will be described in detail below. The support of the present invention has a maximum thermal expansion coefficient αtmax of 2.5.
It is necessary to be x10 ^-5 / ° C or less, and if it is more than this, there is a possibility of color shift, which is not preferable. More preferably 2 × 10 ⁻⁵ / ° C. or less, even more preferably 1.5 ×
It is 10 ^-5 / ° C or less.

When αtmax is large, it is preferable to select a support having an orientation angle in the range of -20 ° to + 20 °. Therefore, in the case of aiming at a high-definition image, it is preferable to select one having both small αtmax and orientation angle. Here, the maximum coefficient of thermal expansion αt max refers to the maximum coefficient of thermal expansion αt in any direction at any position on the support surface. The measuring method will be described later, but in the case of an ordinary biaxially stretched film, the maximum value is in the main orientation direction in the film plane or in the direction orthogonal to it. 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.

The support in the present invention is not particularly limited as long as it is made of a transparent material and has resistance to a developer and dimensional stability to heat. For example, polyolefin such as polypropylene, polyethylene terephthalate, poly Examples thereof include polyesters such as butylene terephthalate and polyethylene naphthalate, polyamides such as nylon 6, nylon 6/6, polyester amides, polycarbonates, polyether ketones, and synthetic resin films such as 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,
Examples of the oxycarboxylic acid component include p-oxyethoxybenzoic acid and p-oxybenzoic acid, and examples of the glycol component include diethylene glycol, propylene glycol, butane glycol, cyclohexanedimethanol,
Examples include 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.

In the present invention, a release layer is provided on the transparent support in order to improve transferability of an image formed on the transparent 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, the softening point is 50-12
An ethylene-vinyl acetate copolymer having a temperature of 0 ° C. is more preferable.

As a method for forming a release layer using a vinyl acetate-based copolymer, there are coating, drying methods, dry laminating methods, hot melt laminating methods, co-coating methods as described in JP-A-3-181947. Extrusion method and the like can be mentioned. Other components of the release layer include, for example, JP-A Nos. 51-5101 and 59-97140.
Substances disclosed in JP 63-2040 A and the like, for example, alcohol-soluble polyamide, alcohol-soluble nylon,
Blend of partially esterified resin of styrene and maleic anhydride copolymer with methoxymethylated nylon, polymer of acrylic acid and its derivative, polyvinyl chloride,
Polyvinyl butyrate, cellulose acetate, etc. 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 colored photosensitive layer of the present invention may be composed of one layer by itself, but the present invention is not limited to this, and a colored layer containing at least a colorant and a binder and a photosensitive layer containing at least a photosensitive composition and a binder. It can also be divided into two layers. In this case, either layer may be present on the release layer side or the transparent support side. In the following description, the colored photosensitive layer will be mainly described. Therefore, unless otherwise specified, the photosensitive layer means a colored photosensitive 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 a water-insoluble and ordinary organic solvent described in JP-B Nos. 47-1167 and 57-43890. Soluble ones are used.

Further, as the azide compound, an aromatic diazide compound having an azido 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-based polymer described in JP-B-45-9613, a polymer having a sulfonyl azide or a carbonyl azide, etc. Kosho 43-21017, 44-
22954 and 45-24915).

Examples of other negative photosensitive compositions include compounds containing derivatives of cinnamic acid, such as polyesters containing -C = C-CO- groups described in US Pat. No. 3,453,237, polyamides, and the like. Examples thereof include polyvinyl alcohol and cinnamic acid esters of hydroxyl group-containing polymers such as cellulose described in JP-A-2732301. Typical examples of the binder resin used in the photosensitive layer include novolac resin, acrylic resin, vinyl acetate resin, polyurethane resin, and epoxy resin.

For example, as a novolac resin, Japanese Patent Application Laid-Open No.
Phenol / cresol / formaldehyde copolycondensation resin as described in JP-A-5-57841, JP-A-55-1
The copolycondensation resin of p-substituted phenol and phenol or cresol and formaldehyde described in JP-A-27553 can be used. As a vinyl acetate resin, Japanese Patent Laid-Open No.
The vinyl acetate-vinyl versatate copolymers described in JP-A-48248 and JP-A-3-181947 are preferably used.

The photosensitive layer may contain an appropriate colorant. Generally, when a colorant is used, a dye or pigment can be used. For example, yellow, magenta, cyan, black pigments, dyes, and other metal powders,
White pigments, fluorescent pigments, etc. can also be used. Specific examples of many pigments and dyes known in the art include, for example, Victoria Pure Blue (42595), Auramine (4
1000), Catillon brilliant flavin (Basic 13), Rhodamine 6GCP (45160), Rhodamine B (45170), Safranin OK 70: 100.
(50240), Erioglaucine X (42080),
First Black HB (26150), No. 120
1 Rionol Yellow (21090), Rionol Yellow GRO (21090), Shimura-First Yellow 8GF (21105), Benzidine Yellow 4T-5
64D (21095), Shimura-First Red 40
15 (12355), Lionol Red 7B4401
(15830), Fastgen Blue TGR-L (7
4160), Rionol Blue SM (26150), Mitsubishi Carbon Black MA-100, Mitsubishi Carbon Black # 30, # 40, # 50, Cyanine Blue 4920.
(Manufactured by Dainichi Seika), Seika Fast Carmine 1483
(Manufactured by Dainichi Seika), Seika Fast Yellow H-700
5,2400 (manufactured by Dainichiseika) and the like. (The number in the above parentheses means a color index (CI).) When a colorant is contained in the photosensitive layer, the content of the colorant is 5 to 50% by weight in the photosensitive layer. Is preferred.

When a colorant is used, the colorant / binder ratio in the photosensitive layer can be determined in consideration of the target optical density and the removability of the photosensitive layer from a developing solution. For example, in the case of dyes, a value of 5% to 75% by weight is generally preferred, and in the case of pigments, a value of 5% to 90% by weight is generally preferred. The film thickness of the photosensitive layer can be selected depending on the target optical density, the type of colorant (dye, pigment, carbon black) used in the photosensitive layer and the content thereof, but the thinner the film, the better the resolution. Higher and better image quality. Therefore,
The film thickness is preferably used in the range of 0.1 μm to 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 phthalates, triphenyl phosphates, and maleates, and examples of the coating property improver include nonion typified by ethyl cellulose, polyalkylene ether and the like. Examples thereof include surfactants such as activators, and fluorine-based surfactants.

The photosensitive layer is generally formed by dissolving a photosensitive composition, an optional colorant, and an appropriate binder in an appropriate solvent to prepare a coating solution, which is applied on the release layer. can do. In the present invention, the photosensitive layer is formed by applying a coating solution containing a solvent such as methyl lactate or methyl ethyl ketone.

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.

When a colored photosensitive layer is divided into a colored layer and a photosensitive layer, and when a plurality of layers are provided such as when a protective layer is further coated on the colored photosensitive layer, coating by each layer,
After drying, a sequential multi-layer coating method in which the material is wound up and a large number of coaters and dryers are arranged side by side on one line to provide a plurality of layers by one time conveyance of the support (for example, JP-A-63-695).
No. 74) 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.

When the colored photosensitive layer contains a photopolymerizable substance, in order to prevent the influence of oxygen, a protective layer (overcoat) which can be dissolved or swelled in a developing solution is provided on the colored photosensitive layer. Layers) can also be provided. As the resin and the like used for the overcoat layer, polyvinyl alcohol, polyethylene oxide, polyacrylic acid, polyacrylamide, polyvinyl methyl ether, polyvinyl pyrrolidone, polyamide, gum arabic, glue, gelatin, casein, celluloses (for example, viscose,
Methyl cellulose, ethyl cellulose, hydroxyethyl cellulose, hydroxypropyl methyl cellulose,
Carboxymethyl cellulose, etc.), starches (eg,
Soluble starch, modified starch, etc.) and the like.

Further, in the present invention, it is preferable that a cover sheet is provided to protect the surface of the colored photosensitive layer. In this case, the cover sheet may be used as a substitute for the protective layer. As the material of the cover sheet, known materials can be used, and specifically, those exemplified as the support or those exemplified as the above-mentioned protective layer can be used.

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 of yellow, magenta, cyan, and black are brought into close contact with each other, and image exposure is performed by irradiating light such as ultraviolet rays. As the light source, a mercury lamp, an ultra-high pressure mercury lamp, a metal halide lamp, a tungsten lamp, a xenon lamp, a fluorescent lamp or the like is used. Similarly, the other three colors are performed.

Next, for each exposed image forming material,
Liquid development is performed with a developing solution, followed by washing with water and drying to form an image area. In this case, as another developing method, for example, Japanese Unexamined Patent Application Publication No.
As described in JP-A-269349, the image portion can be formed by a method of performing peeling development by peeling the cover sheet instead of liquid development using a developing solution.

Next, after exposing and developing as described above to form an image portion, the formed image portion is transferred to a transfer material to obtain a transfer 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. A method of this kind is disclosed in JP-A-47-41830.
No. 59-97140, No. 60-23649 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, only the image layer that substantially forms the image is transferred,
It is preferably 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. Are 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 ° C.
The pressure is 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 above-mentioned Japanese Patent Laid-Open
The method disclosed in Japanese Patent No. 120552 is also preferably used.

Various methods can be used as the method of registration (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 method of using the latter 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.

[0043]

EXAMPLES The present invention will be described in more detail below with reference to examples and comparative examples, but the present invention is not limited to these examples as long as the gist thereof is not exceeded. (1) Measurement of maximum thermal expansion coefficient αtmax in the in-plane direction of the film As a measuring device, TMA manufactured by Vacuum Riko Co., Ltd. was used, and it was 5 mm.
2 for width and 25mm length (measurement direction) sample film
From the temperature / elongation diagram when a tension of 00 g / mm ² was applied and the temperature was raised at 5 ° C./min, two points at 30 to 50 ° C. were connected by a straight line to determine the gradient αt. Of these, the maximum one was defined as the maximum thermal expansion coefficient αtmax. In addition, over 180 degrees,
As a result of measuring every 10 degrees, the direction in which the maximum value and the minimum value of αt were obtained coincided with the main orientation direction in the film plane and the direction orthogonal thereto in all the samples.

Examples 1 to 4 and Comparative Examples 1 to 2 (Preparation of Support) Maximum thermal expansion coefficient αt shown in Table-1.
On a biaxially stretched polyethylene terephthalate film (width 65 cm) having a thickness of 75 μm and having a max and an orientation angle (the values will be described later), ethylene-vinyl acetate copolymer resin (EVAFL manufactured by Mitsui-DuPont Polychemical Co., Ltd.) was used.
EXP P-1405: vinyl acetate content 14% by weight, V
A release layer having a thickness of 25 μm was formed by extrusion laminating with ICAT softening point 68 ° C.). (Photosensitive layer 1: positive type photosensitive layer) A photosensitive solution having the following composition is applied onto the above-mentioned support using a bar coater and dried,
Four types of positive colored image forming materials having a dry film thickness of 1.5 μm were prepared.

[0045]

Table 1 [Photosensitive solution composition] 2,3,4-trihydroxybenzophenone-0.616 parts by weight Naphthoquinone-1,2-diazide-4-sulfonic acid ester vinyl acetate-vinyl versatic acid copolymer 8.768 parts by weight Parts (80:20 wt%, weight average molecular weight 50,000, 50% methanol solution) cyclohexanone 35.2 parts by weight Fluorosurfactant (3M, FC-430) 0.01 parts by weight Pigment [Pigment] Black : Carbon black MA-100 0.99 parts by weight (manufactured by Mitsubishi Kasei Co., Ltd.) Cyan: Cyanine blue 4920 (manufactured by Dainichiseika Co., Ltd.) 0.55 parts by weight Magenta: Seika Fast Carmine 1483 0.68 parts by weight ( Dainichi Seika Co., Ltd. Yellow: Seika First Yellow 2400 0.68 parts by weight (Dainichi Seika Co., Ltd.) ) (Transfer image forming method) The color-separating net positive film of each color is overlaid on the polyethylene terephthalate film surface of the four-color positive type colored image forming material obtained as described above, and a 4 kW metal halide lamp is used to move from a distance of 50 cm to 2
Imagewise exposure for 0 seconds, and then the following developer at 30 ℃ for 30
It was immersed for 2 seconds for development to form a 4-color colored image.

[0046]

[Developer composition] Konica PS plate developer SDP-1 (manufactured by Konica Corp.) 20 ml Perex NBL (manufactured by Kao Atlas Corp.) 50 ml Water 400 ml The size of the obtained image is A1 size (594). × 841m
m) but in the long-side direction outside this image, the register
There is a pin hole for the pin bar, the four vertices of the image and the image
The size of the misalignment at the center position (outside the image) of each side of
The size of the sheet is large because it has registration marks for confirmation.
The size is 650 x 900 mm, which is larger than the image. This sea
Example 1 of Japanese Patent Laid-Open No. 3-120552
Yellow and magenta on art paper by the method described.
Transfer images of four colors, i.e., cyan, cyan, and black were formed. Do
Ram and press roll temperature 80 ℃, roll pressure 4kg
/cm ²Is.

The obtained image had good transferability and was very similar to the image of a printed matter prepared by ordinary offset printing. This printed matter approximation was evaluated as follows. That is, ten test subjects visually compared a printed matter obtained by offset printing the same original as the obtained image by a usual method, and evaluated the printed matter approximation of the transferred image. When 6 or more out of 10 persons judged that the approximation was good, the transferred image was evaluated as having good approximation to the printed matter. As a result, in the case of Example 1 in Table-1, in this image, 8 out of 10 persons judged that the printed matter approximation was good.

Table 1 shows the data of the orientation angle magnitude and the positional deviation of the sample. However, the side where the pin hole of the register pin bar exists is the upward direction (in order to pass through the transfer machine from this direction), the vertical and horizontal directions are displayed. At this time, since the left-right direction of the sheet corresponds to the width direction at the time of manufacturing the support, the values of the orientation angle are displayed at the left end and the right end. Furthermore, the value of the positional deviation is 4 in the upper left, upper right, lower left, and lower right of the image.
This is the data of the points, which shows the deviation value of the two-color registration mark having the largest deviation among the four-color registration marks.

In Table 1, the numerical values of the orientation angle of the support are shown in the upper part of the leftmost orientation angle value and the rightmost orientation angle value in the leftmost / rightmost format. The lower part shows the arithmetic mean value between the leftmost value and the rightmost value, and the difference between the average values shows the difference between the maximum and the minimum of the arithmetic average value. The visual evaluation was performed based on the following criteria.

[0050]

[Table 3] (Visual Evaluation Criteria) A: No misalignment: 8 or more out of 10 people do not recognize misalignment. B: Almost no misalignment: 6 or more out of 10 people do not recognize misalignment. C: Misalignment: 4 or more out of 10 people do not recognize misalignment. D: Remarkable misalignment: 3 or less out of 10 people do not recognize misalignment. In the same manner, the above operations were repeated using colored image-forming materials having different supports only.

[0051]

[Table 4]

Examples 5 to 8 and Comparative Examples 3 to 4 (Photosensitive layer 2: Negative type photosensitive layer) The support used in Example 1 was coated with a photosensitive solution having the following composition using a bar coater, After drying, a colored photosensitive layer of four colors having a dry film thickness of 1.5 μm was obtained.

[0053]

[Table 5] [Photosensitive solution composition] Vinyl acetate-vinyl versatate copolymer 12 parts by weight (80:20 wt%, weight average molecular weight 50,000, 50% methanol solution) 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 Fluorosurfactant (3M, FC-430) 0.01 parts by weight The following pigments [pigments] Black: carbon Black MA-100 1.98 parts by weight (manufactured by Mitsubishi Kasei Co., Ltd.) Cyan: Cyanine Blue 4920 (manufactured by Dainichiseika Co., Ltd.) 1.10 parts by weight Magenta: Seika First Carmine 1483 1.36 parts by weight (Dainichi Seisei) Chemical Co., Ltd.) Yellow: Seika First Yellow 2400 1.3 Parts (Dainichi manufactured Seika Co.) Next, the respective colors of the colored photosensitive layer, using a bar coater overcoat layer solution having the following composition with a dry thickness 0.3μm
And dried to prepare a four-color negative type colored image forming material.

[0054]

[Table 6] [Overcoat layer solution composition] Polyvinyl alcohol (GL-05, manufactured by Nippon Synthetic Chemical Industry) 6 parts by weight Water 97 parts by weight Methanol 3 parts by weight Next, color-separated negative halftone images are used as corresponding negative type colored images. After contact exposure on the forming material (colored sheet), development was performed to obtain a transfer sheet of four colors.

The image and the sheet are the same as those in the first embodiment. Using this, transfer images of four colors were formed on art paper under the same apparatus and conditions as in Example 1. The obtained results are shown in Table 2.

[0056]

[Table 7]

[0057]

INDUSTRIAL APPLICABILITY The image-forming material of the present invention does not cause positional deviation or color misregistration in an image even when it is transferred multiple times onto an image-receiving material to form a multicolor image, and is a good image similar to a printed matter. It is possible to form.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yutaka Adachi, 1 Hino-shi, Sakura-cho, Tokyo Konica stock company (72) Inventor Kunio Shimizu 1, Tokyo-shi, Hino-shi Konica stock company

Claims (3)

[Claims] 1. A maximum thermal expansion coefficient αt in the in-plane direction of the film.
max is 2.5x10 ^-FiveVinegar on a transparent support that is below
A release layer and a colored photosensitive layer containing a vinyl acetate copolymer are formed.
An image forming material characterized in that 2. The transparent support has a maximum coefficient of thermal expansion .alpha.tmax in the in-plane direction of the film of 2.5.times.10.sup.- ⁵ / .degree. C. or less and all orientation angles are in the range of -20 to +20 degrees. The image forming material according to claim 1. 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.