JPS6020741B2 - Photosensitive materials for color image formation - Google Patents

Abstract

PURPOSE:To form a color copy on a sheet of plain paper by a one-shot process in spite of a color process photopolymerization, by distributing a specified capsule group of each primary color at random on a support.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a photosensitive material for forming color images using photopolymerization.

Conventional color image forming methods, excluding general printing methods, can be broadly classified into three types: '1) silver salt color method, {2] electrophotographic color method, and color method using light polymerizability.

Among these, methods [11 and 3] have the advantage of being able to easily obtain color copies using one exposure and development process, that is, the one-shot color method, but have the disadvantage that they cannot be copied on plain paper. be. Also, although the method '2'' allows color copying on plain paper, it has the disadvantage of requiring complicated processes such as color printing. That is, the leg method includes, for example, an adhesive layer on a support, an ink layer in which printing ink is dispersed in a water-soluble polymer such as PVA or gelatin, and a photopolymerizable photosensitive agent in which a diazo photosensitive agent is dispersed in the same water-soluble polymer. A color image forming unit in which layers are sequentially layered is prepared for each primary color of cyan, magenta, and yellow. This unit is closely exposed to a silk negative separated into three colors, and then a developing solution corresponding to each primary color is applied onto the unit. After spraying, the process of dissolving and removing the unexposed areas by friction and exposing the ink layer is repeated for each unit, and the resulting ink images of each primary color are transferred to the transfer sheet while being aligned. However, this method requires preparing units and developing solutions for each primary color and then repeating the exposure, development, and transfer steps for each unit, which is extremely complicated and also increases the cost of color copying. Undesirable. The present invention provides a photosensitive material for color image formation that allows color copies to be made on plain paper by a more simplified one-shot method, despite the color method utilizing photopolymerization. Further, the present invention provides a photosensitive material for color image formation, from which inexpensive transferred color copies can be obtained without a developing step.

As shown in FIG. 1, such a photosensitive material has three capsules, blue-sensitive yellow-colored capsules, green-sensitive magenta-colored capsules, and red-sensitive cyan-colored capsules, on a support 1.
Capsule groups 2, 2' and 2'' (2 is a blue-sensitive yellow colored capsule, 2' is a green-sensitive magenta colored capsule, and 2'' is a red-sensitive cyan colored capsule) are randomly distributed, Capsule 2 contains a photopolymerizable monomer, a free radical generator, a blue-sensitive dye as a polymerization initiator, and a yellow colorant, and capsule 2' contains a photopolymerizable monomer, a free radical generator, a green-sensitive dye as a polymerization initiator, and a yellow colorant as a polymerization initiator. The capsule 2'' contains a photopolymerizable monomer, a free radical generator, a red photosensitive dye as a polymerization initiator, and a cyan colorant, respectively.

To make the photosensitive material of the present invention, photopolymerizable monomers, blue color,
A solution or dispersion (hereinafter referred to as oil phase) consisting of a dye sensitive to green or red (polymerization initiator), a yellow, magenta or cyan colorant, and a surfactant if necessary, is combined with a PVA encapsulating agent and a free The capsules may be encapsulated in an aqueous solution containing a radical generating agent by a known method, and the resulting three types of capsule groups may be thoroughly mixed and randomized, and then sprinkled onto a support such as paper or film.

In this case, a small amount of binding resin can be added to the capsule mixture. The materials used in the photosensitive material of the present invention may be any known materials, and photopolymerizable monomers include vinyl compounds such as acrylamide, acrylic acid, acrylonitrile, methacrylate, styrene, and glycerol triacrylate.

As a free radical generator, N-phenylglycine,
Trihexylamine, N,N-diethylxylidene, N
, N'-dimethyl-1,4-pibe-3-lazine, etc. Red, green, or blue sensitive dyes used as polymerization initiators include N,N,N',N'-tetra-n.
-Butylthionine (665nm), N for green ones
, N,N',N'-tetramethyl 3-4-dodecyl safranin (56 m), and for blue color, phenanthrenequinone (41 m) can be used.

Coloring agents for cyan, magenta, and yellow include ultramarine, navy blue, cobalt blue 41, Kurekoro, phthalocyanine blue, indansrenfur, indigo, etc. for cyan, and Pengara and lead tan for magenta. , cadmium red, permanent red, thioindigo red, etc. For yellow, pigments such as yellow lead, barium chromate, cadmium yellow, ocher, and Hanzaiero 1 can be used, but dyes can also be used.

Next, a method for forming a color image using the photosensitive material obtained as described above will be explained with reference to FIG.

First, when the photosensitive material 3 is exposed under a color original (not shown), for example, in the case of a green light component, only the monomer in the capsule 2' containing the green photosensitive dye on the photosensitive material undergoes dye-sensitized photopolymerization. Wake up and harden. This photopolymerization mechanism is shown by the following formula. At this time, the PVA forming the outer shell of the capsule 2' also hardens at the same time, and the support 11 adheres more strongly than the unhardened capsules 2 and 2''. D
hre D*AH2 (D10AH+) DH, 10AH, Kusaku2 polymer (D: dye, D*: excited triplet state of dye, AH2
: free radical generating agent) Next, a transfer sheet 4 such as paper or film is placed on the exposed photosensitive material 3, and pressure or heat is applied from above, so that the non-exposed area on the surface of the photosensitive material 3, that is, the uncured area. Capsules 2 and 2
'' is transferred onto the transfer sheet 4 as it is.

Since the transferred capsules 2 and 2'' are colored yellow and cyan, respectively, an apparently green image is formed on the transfer sheet 4. In addition, other primary color lights, such as blue light and red light In this case, images of the primary colors, ie, blue and red, are formed using the same principle as in the case of green light, and thus a transferred color image can be obtained with only one exposure and transfer step each, and without a development step. The transfer sheet may be provided with an adhesive layer in order to increase the transfer efficiency.In order to make the colors of the color image even clearer and to improve the fixing effect, after the transfer process, the transfer sheet is pressurized to remove the capsules on the surface. It may be destroyed. Examples are shown below.

EXAMPLE Three types of microcapsules of cyan color, magenta evening color and yellow color were prepared as follows according to a known method.

That is, 50q of PVA6 Boto as an encapsulating agent and 1.8 parts of N-phenylglycine as a free radical generator.
O's hot water 30th floor B! This was dissolved, and an oil phase of the following formulation was added to this solution and emulsified and dispersed. Glycerol triacrylate 8 parts N,N,N',N'-tetra-
n-butylthionine 0.
1 part phthalocyanine blue 2 parts surfactant
0.2 parts Penzyl alcohol 0.5 parts Next, this emulsion was diluted with 10 parts of warm water, and acetic acid was gradually added dropwise to adjust the pH to 4 to 4.3. The encapsulating agent containing the free radical generating agent was surrounded by a pillow, producing a sol-like capsule.

This capsule is a red photosensitive cyan capsule. In addition, in the above formulation, N,N,N',N'-tetof-n-
Green-sensitive magenta capsules were prepared in the same manner using N,N,N',N'-tetramethyl-4-dodecylsafranine instead of butylthionine, and pengara instead of phthalocyanine flue.

Furthermore, in the above formulation, N,N,N',N'-tetof-n
Blue-sensitive yellow capsules were prepared in the same manner using phenanthrenequinone instead of butylthionine and cadmium yellow instead of phthalocyanine.

Next, the capsules of the above three colors were thoroughly mixed and randomized, and the mixture was sprinkled onto a film to obtain a photosensitive material for color post-formation. After exposing this photosensitive material under a color original,
When plain paper was stacked and pressure was applied, the capsules in the non-exposed areas were transferred and a clear color image was formed.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an example of the photosensitive material of the present invention, and FIG. 2 is a process diagram showing a method for obtaining a color image using this photosensitive material. 1...Support, 2...Blue-sensitive yellow capsule, 2'...Green-sensitive magente evening capsule, 2''...Red-sensitive cyan capsule, 3... photosensitive material, 4... transfer sheet.

Claims (1)

[Claims] 1 (a) Photopolymerizable monomer, free radical generator,
A blue-sensitive yellow colored capsule containing a colored photosensitive dye and a yellow colorant as a polymerization initiator and using PVA as an encapsulating agent, (b) a photopolymerizable monomer, a free radical generator, and a green photosensitive dye as a polymerization initiator. and magenta colorant, and PVA as an encapsulating agent.
and (c) a green photosensitive magenta colored capsule using
Three types of capsules, including a photopolymerizable monomer, a free radical generating agent, a red photosensitive dye and a cyan coloring agent as a polymerization initiator, and a red photosensitive cyan colored capsule using PVA as an encapsulating agent, were randomly placed on a support. A photosensitive material for forming a color image, characterized in that the material is distributed in a color image.