JPH0355550A - Production of colored image forming material - Google Patents

Abstract

PURPOSE:To prevent the blocking and staining at the time of un-winding by taking up a colored photosensitive layer while inserting a sheet having a high release property to the colored photosensitive layer on the colored photosensitive layer at the time of taking up the colored photosensitive layer after coating. CONSTITUTION:The sheet having the release property to the colored photosensitive layer is inserted on the colored photosensitive layer at the time of taking up the colored photosensitive layer obtd. after applying the colored photosensitive layer on a thermally softened layer and drying the same. The blocking preventive sheet to be used is at least the sheet, the surface of which has the release property to the colored photosensitive layer. For example, a plastic sheet having the high release property of the surface, etc., are adequate as the sheet consisting of an independent material. The more specific examples thereof include a polypropylene sheet, polyethylene sheet, 'Teflon(R)' sheet, etc. Release treated plastics, paper, etc., are exemplified as the sheet consisting of composite materials. The blocking and staining are prevented in this way.

Description

Detailed Description of the Invention <Industrial Application Field> The present invention relates to a colored image forming material used for color proofing for color proofing in color printing. The present invention relates to a method for producing a colored image forming material that can obtain a transferred image that is more similar in image quality.

<Conventional technology> Color sheets for color proofing (
It is well known in the art that color proofs are used.

Examples of methods for creating multicolor transfer images using color sheets for color proofing include the direct transfer method described in Japanese Patent Laid-Open No. 47-41830, in which a colored image is directly transferred and laminated onto a final image-receiving paper; As described in Japanese Patent Application Laid-Open No. 59-97140,
An indirect transfer method in which a colored image is temporarily transferred onto a temporary image-receiving sheet, and a process of forming an image after transferring a colored photosensitive layer to an image-receiving paper described in Japanese Patent Application Laid-Open No. 56-501217 is repeated. Examples include methods. In both of these methods, the surface of the transfer material on which the image is formed is coated with an organic polymer layer, so the resulting image surface is too glossy, giving an impression that the image quality is different from the actual image quality. Therefore, in order to solve this problem, an image-only transfer method was devised in which only a colored image is transferred and laminated onto a transfer material to form a multicolor image. Since this method does not coat the transferred material with an organic polymer layer, in principle it is possible to obtain an image that is very close to the image quality of actual printing. Problems to be Solved by the Invention> However, in the case of a colored image sheet used in the image-only transfer method, in order to easily transfer only the image from the heat-softening layer to the transfer sheet during the heat lamination process, the colored photosensitive layer is Decrease adhesion between and heat-softened layer (increase releasability)
There is a need. Therefore, after coating and drying the colored photosensitive layer on the heat-softening layer, when the colored photosensitive layer coating sheet is wound up as usual, the colored photosensitive layer is coated on the heat-softening layer with high mold releasability. The back side of the coating sheet <PET side> is piled up and rolled onto the colored photosensitive layer, and if there is even a small amount of solvent remaining, the colored photosensitive layer is easily transferred to the PET side, causing coloring. This results in chipping of the photosensitive layer (prosoking). In addition, if the drying temperature during coating is increased to prevent such prosoking, the heat-softened layer will melt and some of it will mix at the interface with the colored photosensitive layer, which will cause the printing plate to dry after development. There is a problem that stains (background stains) occur in the non-image areas of the image.

<Means for Solving the Problem> The inventors of the present invention have conducted intensive studies to provide a method for producing a colored image forming material that solves the above-mentioned problems. In this case, a sheet with high releasability for the colored photosensitive layer is used as a prosoking prevention sheet and is rolled up while sandwiching it on the colored photosensitive layer, thereby forming a colored image that is less likely to cause pronking or scumming during unwinding. We discovered a method for manufacturing the material and completed the present invention. That is, an object of the present invention is to provide a method for producing a colored image forming sheet that is less likely to cause blocking or scumming.

The object of the present invention is to provide a colored image-forming material having, on a support, a heat-softening layer, a colored photosensitive layer containing a photosensitive composite material, and a coloring agent in this order, which can be subjected to imagewise exposure and development. In a method for producing a colored image forming material for forming a colored image by transferring only the colored image area formed by processing to a transfer material, a colored photosensitive layer is coated on the heat-softening layer and dried. Thereafter, when the obtained colored image-forming material is wound up, a sheet having releasability to the colored photosensitive layer is sandwiched over the colored photosensitive layer by ε.

The present invention will be explained in detail below.

The transparent support used in the present invention is not particularly limited, but
A two-wheel stretched polyethylene terephthalate film is preferred in terms of dimensional stability against heat. However, acetate film, polyvinyl chloride film, polystyrene film, polypropylene film, polyethylene film, etc. may also be used.

The thickness of the transparent support is suitably in the range of 10 to 300 μm, particularly preferably in the range of 25 to 200 μm. The heat-softening layer used in the present invention is as follows:
A film-forming thermoplastic resin having a softening point of ~140°C, preferably 70-100°C is used.

For example, the copolymer of ethylene and vinyl acetate, the copolymer of ethylene and acrylic acid ester described in JP-A No. 1-155349, the copolymer of ethylene and acrylic ester described in JP-A-1-102546 and JP-A-64-90437, Examples include the alicyclic saturated hydrocarbons and styrene copolymers described above. In particular, styrene copolymers are preferred, and specific examples thereof include 1Hymer ST-95'''Hymer ST-120''' manufactured by Sanyo Kakai Kogyo Co., Ltd., and ``Bicolastic'' manufactured by PICCO Co., Ltd. “Oligo Z” manufactured by Tomoekawa Paper Mills into which acid groups have been introduced, and “Alcon P series” manufactured by Arakawa Chemical Industry Co., Ltd., M as resins having alicyclic saturated hydrocarbon groups.
Series” etc.

The thickness of the thermally softened layer is suitably in the range of 1 to 100 μm, particularly preferably in the range of 2 to 60 μm. In the present invention, a colored photosensitive layer is provided on the heat-softening layer, but this can be done not only by directly laminating it on the heat-softening layer, but also by laminating it indirectly through an intermediate layer provided for some purpose. This includes cases where The most typical example of such an intermediate layer is a release layer provided for the purpose of improving the transferability of the colored photosensitive layer. As specific examples thereof, silicone resins, fluorosurfactants, polyolefins, polyamides, etc. described in Japanese Patent Application No. 63-328175 can be used.

Furthermore, the release layer can be cured by UV or heat, if necessary.

The thickness of the release layer is preferably 0.05 to 2μ.

In the present invention, various photosensitive compositions can be used as the photosensitive composition contained in the colored photosensitive layer, but when irradiated with actinic rays, the molecular structure undergoes a chemical change within a short period of time, making it difficult to react to the solvent. All compounds such as monomers, brevolimers or polymers whose solubility changes and whose exposed or unexposed portions are dissolved away when certain solvents are applied are included. Examples of photosensitive compositions that can be used include photocrosslinking type photosensitive materials, such as those made by esterifying polyvinyl alcohol with cinnamic acid, which are so-called negative and positive types that reduce the solubility of exposed areas. Resin system: A system in which a diazonium salt or its condensate is mixed with polyvinyl alcohol, polyvinylpyrrolidone, polyacrylamide, etc.: A system in which an aromatic azide compound is used as a photocrosslinking agent and mixed with a binder such as cyclized rubber, etc. In addition, photosensitive resins using photoradical polymerization or photoionic polymerization can also be used. In addition, examples of so-called positive-positive type materials that increase solubility in exposed areas include photosensitive resin compositions containing 0-quinonediazide as a photosensitive substance, specifically 1,2-penzoquinonediazide- 4-sulfonyl chloride, 1.2-naphthoquinonediazide-4-manifonyl chloride, 1.2
-naphthoquinonediazide-5-sulfonyl chloride,
1. A compound obtained by condensing 2-naphthoquinonediazide-6-sulfonyl chloride with a compound containing a hydroxyl group and/or an amino group is preferably used. Examples of the above-mentioned hydroxyl group-containing compounds include trihydroxybenzophenone, dihydroxyanthraquinone, bisphenol A1 phenol novolac resin, resorcin benzaldehyde condensation resin, and birogallol acetone condensation resin. Further, examples of the amino group-containing compound include aniline, p-
aminodiphenylamine, p-aminobenzophenone,
Examples include 4,4'-diaminodiphenylamane, 4,4-diaminobenzophenone, and the like.

Regarding the above 0-quinonediazide compound, J,
“Light Sensitive” by KOSAR
System(Wiley & Sons, New
York+ 1965) and those described in "Photosensitive Polymers" by Inui Nagamatsu (Kodansha, 1977) can also be used. Furthermore, as positive and positive compounds, i) compounds that can generate an acid upon irradiation with actinic rays, ii) compounds that have at least one bond that can be decomposed by an acid, and i
It is also possible to use photosensitive resins containing ii) novolac resins containing two or three different phenols.

The content of the photosensitive composition in the colored photosensitive layer is, for example, 5 to 80% by weight.

Further, as the binder constituting the colored photosensitive layer, a polymer compound is used which is film-forming and solvent-soluble, and preferably dissolves or swells in an alkaline developer.

Specific examples of such polymer compounds include, for example, Japanese Patent Application Laid-Open No.
Polymer compounds having N-(4-hydroxyphenyl)-(meth)acrylates described in Publication No. 99048, specifically N-(4-hydroxyphenyl)-monoacrylamide, acrylonitrile, and methyl acrylate. Copolymer, also JP-A-55-57841, JP-A-55-1
Examples include novolac resins described in Japanese Patent No. 27553.

The content of the polymer compound is suitably 20 to 80% by weight. In the colored photosensitive layer, dyes and pigments are added as colorants. For example, those described in JP-A-1-99048 can be mentioned.

The content of the colorant in the colored photosensitive layer is 5% to 5% by weight.
0% is appropriate.

The colorant/binder ratio of the colored photosensitive layer is determined based on the target optical density and the developer of the colored photosensitive layer. It can be determined by a method known to those skilled in the art in consideration of removability. For example, in the case of dyes, the appropriate value is 5% to 75% by weight, and in the case of pigments, the value is 5% to 90% by weight.

The colored image forming material is imagewise exposed and developed with an alkaline developer to form a colored image in the same manner as in Japanese Patent Application No. 62-261)29. Next, the obtained colored image is transferred to a transfer material such as art paper or coated paper. Specifically, the colored image layer and the surface of the transfer material are overlapped and passed through a laminator under heat and pressure. The laminator conditions are usually a heating temperature of 70 to 150°C.
, it is appropriate for the passing speed to be in the range of 50 to IOOCII/min. By heating and applying pressure when passing through the laminator, the colored image portion is fused to the surface of the transfer material, and transferred and laminated.

As a coating method for coating the heat-softening layer on the support, methods such as blade coating, reverse roll coating, gravure coating, rondo coating, gooey coating, and laminating methods are used. The coating method for coating the colored photosensitive layer on the heat softening layer coated support includes roll coating. Reverse roll coating. Methods such as gravure coating and die coating are used. In addition, when drying the colored photosensitive layer, the heating temperature is preferably 30°C to 100°C, particularly preferably 40°C to 90°C, in order to prevent mixing of the colored photosensitive layer and the heat-softened layer, which may cause scumming. It is. During drying,
The commonly used method is to dry the colored photosensitive layer while keeping the temperature of the heated air constant, but it is also possible to dry the colored photosensitive layer by increasing the temperature of the heated air in stages. can. Further, the drying time is preferably in the range of 30 seconds to 10 minutes.

Furthermore, when winding up the sheet on which the colored photosensitive layer has been coated and dried, a sheet (bronching) having mold release properties for the colored photosensitive layer is placed on the colored photosensitive layer for the purpose of preventing profking of the colored photosensitive layer. The film is wound up with the "preventive sheet" sandwiched in between.

When the colored photosensitive layer coating sheet is wound up, the amount of residual solvent in the young photosensitive layer to be wound up is preferably 10% or less by weight, more preferably 5% or less. Also,
The winding speed is preferably 1 m/min to 70 m/min, particularly preferably 3 m/min to 50 m/min. Moreover, the winding tension is 0. 0 2 ~ 0. 4
kg/cm is preferred, particularly preferably 0.04
The anti-blocking sheet used in the present invention is in the range of ~0.3 kg/am.
At least the surface of the material has mold releasability with respect to the colored photosensitive layer.For example, as a single material, Plasti Noxy 1, etc., which have a high surface mold releasability, is suitable.Specifically, , polypropylene sheet, polyethylene sheet, Teflon sheet, polyvinyl alcohol sheet, etc. In addition, examples of composite materials include release-treated plastics, paper, etc. Specifically, silicone coated polyethylene terephthalate sheets, polyethylene laminated polyethylene terephthalate sheets,
Examples include silicone coat 1, paper, and polyethylene laminate. These sheets can be embossed, cloaked, porous, nonwoven-like, etc., as desired.

In addition, the thickness of the anti-prosoking sheet is 10um.
A range of 1000 μm is preferable.

〔Example〕

EXAMPLES Hereinafter, the present invention will be explained in more detail with reference to Examples and Comparative Examples, but the present invention is not limited to these Examples.

Example 1 A heat-softening layer solution (U) below was coated onto a polyethylene terephthalate film having a thickness of 75 μm to a thickness of 25 μm using a Goocoater.

Next, a colored photosensitive layer dispersion (A) of the following set was applied onto the heat-softened layer using a reverse roll coater to a dry film thickness of 1.
It was applied to a thickness of 5 μm. Colored photosensitive layer dispersion (A) The alkali-soluble polymer composition was prepared in the following manner. In a four-bottle flask with a capacity of 11, 8.85 g of hydroxyphenyl methacrylamide and 2.65 g of acrylonitrile were added.
, 33.1) g of methyl acrylate, and 1.64 g of abbisisobutyronitrile (polymerization initiator),
g of ethyl alcohol was used as a solvent, and the reaction was carried out at 77°C for 6 hours. Thereafter, 75 g of methyl cellosolve was added to stop the reaction, and ethyl alcohol was distilled off at 60° C. for 3 hours.

Next, after drying at a drying temperature of 70°C for 2 minutes, a thickness of 25 μm was obtained.
0.m of polypropylene is superimposed on the photosensitive layer.
It was wound up with a winding tension of 0.7 kg/cta.

When the colored photosensitive sheet was unwound from the wound coil, no blocking occurred at all.

The color separation mesh film of each color was superimposed on the four colored image forming materials obtained above, imagewise exposed for 40 seconds from a distance of 1 m using a 4kW metal halide lamp, and developed by immersing it in the following developer for 30 seconds. As a result, a clean four-color colored image was formed with no background stains in the non-image areas.

Riei Nao SDR-1 (Developer for Boji PS plate, manufactured by Konica)
20g surfactant (Perex NBL, manufactured by Kao Atlas Co., Ltd.) 50g distilled water 400gNext, the image surface of the yellow colored image sheet and Art Gi were brought into close contact,
5kg/c between a pair of nip rolls heated to 80℃
A yellow colored image was transferred onto art paper by passing at a speed of 50 an/min under a pressure condition of "aa", and the support on the colored image side was peeled off.Subsequently, magenta, cyan, and black were transferred in the order of magenta, cyan, and black. , a colored image was transferred, and a color image very similar to a printed image was formed from four colors on art paper.

Further, when the colored photosensitive sheet coil was left at room temperature for one week and then unwound, no prosoking occurred.

Example 2 Coating and drying were carried out in exactly the same manner as in Example 1, except that the colored photosensitive layer dispersion (A) was changed to the following colored photosensitive layer dispersion (B), and a 40μ blank polyethylene sheet was exposed to light. The layers were superimposed and wound up in the same manner as in Example 1.

When the colored photosensitive sheet was unwound from the coil that had been wound up, no blocking occurred at all. Further, when exposed and developed in the same manner as in Example 1, a good four-color colored image sheet with no background smear was obtained, and when laminated and transferred to art paper, a color image similar to that of a printed matter was formed.

Colored photosensitive layer dispersion (B) Alkali-soluble polymer & Ilrfc material of the following composition (weight average molecular weight 17,000,50%)
Methyl cellosolve solution) 12g0H (l:m:n=1(1)0:80) Pentaerythritol tetraacrylate 4.3g Michler's ketone 0.04g Penzophenone 0.25g Paramethoxyfuunol 0.01g Methyl cellosolve 94g Fluorine surfactant <Manufactured by 3M Company, FC-430) 0.01g The following pigments (black pigment) Black: Carbon black MA-100 (manufactured by Mitsubishi Kawei) 1. 9 8 g Cyanide: Cyanine Blue-4920 (manufactured by Dainichiseika) 1. 10 g Magenta: Seiroku First Carmine 1483 (manufactured by Dainichiseika) 1.36 g Yellow: Seika First Yellow 2400 (manufactured by Dainichiseika) 1.36 g Example 3 In Example 1, colored photosensitive layer dispersion? Fl. Coating and drying were carried out in exactly the same manner except that (A) was changed to the following colored photosensitive layer dispersion (C), and 20 μm silicone coated paper was placed on the photosensitive layer so that the silicone surface was in close contact with the photosensitive layer. Overlapping winding was performed. When the colored photosensitive sheet was unwound from the wound coil, no prosoking occurred. Further, when exposure and development were performed in the same manner as in Example 1, a good four-color colored image sheet with no background stains was obtained, and when layered and transferred onto art paper, a beautiful color image similar to that of printed matter was formed. .

Colored photosensitive layer dispersion (C) A certain alkali-soluble polymer U compound of the following composition (weight average molecular weight 17,000.50% methyl cellosolve solution) 12g0H (J':m:n=10:10:80) N! CP The following pigments (pigments) Black Carbon Black MA (manufactured by Mitsubishi Kakai) Cyan: Cyanine Blue-4920 (manufactured by Dainichiseika) Magenta: Seiriki First Carmine 1483 (manufactured by Dainichiseika) Yellow: Seiriki First Yellow 2400 (manufactured by Dainichiseika) (manufactured by Nisseika) 1.9 0g 1. 3 1. 3 6 g Comparative Example 1 A winding coil of a photosensitive layer coated sheet was obtained in the same manner as in Example 1 except that the anti-prosoking sheet was not inserted when winding up the photosensitive layer coated sheet. . When the colored photosensitive sheet was unwound from the coil, the photosensitive layer suffered from prossoking and was partially chipped.

Comparative Example 2 A winding coil of a photosensitive layer coated sheet was obtained in exactly the same manner as in Example 1 except that the drying conditions were changed from 70°C to 1) 0°C.

When the colored photosensitive sheet was unwound from the coil, no prosoking of the photosensitive layer occurred. When this sheet was exposed and developed in the same manner as in Example 1, scumming occurred in the non-image areas.

Furthermore, when the colored photosensitive sheet was unwound after the coil was left at room temperature for one week, blocking occurred and the photosensitive layer was partially missing.

<Effects of the Invention> As explained in detail above, by the method for producing a colored image forming material of the present invention, it was possible to obtain a colored image forming material free from prosoking and scumming.

Out wish Man Mitsubishi Kaoru Co., Ltd. teenager Reason Man

Claims (1)

[Claims] (1) A colored image-forming material having a heat-softening layer and a colored photosensitive layer containing a photosensitive composition and a colorant in this order on a transparent support, the colored image forming material being formed by imagewise exposure and development treatment. In a method for producing a colored image forming material for forming a colored image by transferring only the image area to a transfer material,
After coating the colored photosensitive layer on the heat-softening layer and drying it, when winding up the obtained colored image forming material, a sheet having mold release properties for the colored photosensitive layer is coated on the colored photosensitive layer. A method for producing a colored image forming material, characterized by sandwiching the material.