JPS61175640A - Formation of picture image separation screen and picture image forming material used for it - Google Patents

Abstract

PURPOSE:To form a picture image separation screen soft in gradation by doubling an image separation element. CONSTITUTION:An upper colored photosensitive layer 1 is brought into intimate contact with an negative mask 4 as an image separation element and exposed to light emitted from an optional kind of light source, so long as it has spectral energy enough to insolubilize modified PVA effectively. Then, the layer 1 is washed and dried, and the lower colored photosensitive layer 3 is again likewise exposed through an interlayer 2 in contact with the mask 4. The image forming material is immersed in a solvent softening the resin of the layer 2, and not dissolving the layers 1, 3, resulting in dissolving off the unexposed nonimage line parts of the layer 3 together with the layer 2 overlying on these parts, thus permitting the image separation element of soft gradation having double kinds of dots to be formed.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides an image separation screen, more specifically, an image separation screen, which is used in contact with an original image when copying or taking a photograph of the original image. The present invention relates to a method for forming an image separation screen that can take into account the picture pattern and at the same time convert the density of the original image as a whole, and an image forming material used therein.

[Conventional technology]

When replicating a photograph, calligraphy, or other printed matter as an original painting, a specific pattern is added to the resulting reproduction.
At the same time, it is often requested that the shading of the original painting be converted as a whole. For example, when a photograph with strong gradation is copied using a copying machine, the resulting copy should have a moderate gradation as a whole. In such a case, an image separation screen formed by printing image separation elements on a transparent support using white ink or two types of ink, white ink and black ink, is placed on the original image,
Methods such as copying are used.

Such an image decomposition screen is disclosed in Japanese Patent Application Laid-Open No. 59-10948.
listed in the number. However, since image separation screens formed by printing methods are subject to limitations on printing technology, it is generally difficult to obtain extremely fine image separation elements with high precision.

Further, the cross section of the obtained image decomposition element does not have a density difference within the image decomposition element, as shown in FIG. 1, and has a high contrast. - As shown in Figure 2, if a soft image separation screen with a density distribution within the separation element is obtained, it is thought that the reproduction obtained by copying the original will have even gentler gradations. There is a demand for such a soft image resolution screen.

[Problem that the invention seeks to solve]

The present invention uses a photosensitive material to create an extremely fine image separation screen that cannot be obtained by printing, and further, as shown in FIG. It is an object to provide a method of forming a decomposition screen and an imaging material for use therein.

[Means and effects for solving the problems] The image forming material of the present invention has a hydrophobic support.

A modified polyvinyl alcohol (hereinafter referred to as modified It is characterized by being provided with a photosensitive layer whose main components are polyvinyl alcohol (abbreviated as polyvinyl alcohol) and a colorant. The image forming material and image separation screen forming method of the present invention will be described with reference to the drawings.

FIG. 4 is a cross-sectional view of the image forming material of the present invention. still,
The drawings are illustrative of typical models in order to make the invention easier to understand, and the invention is not limited to these drawings. An example of the image forming method of the present invention is shown in FIGS. 5(A), 5(B), and 5(C). That is, as shown in FIG. 5A, the upper colored photosensitive layer (1) is exposed in close contact with the image separation element negative mask (4). The light source used for exposure may be one that has spectral energy that effectively renders the modified polyvinyl alcohol insolubilized in water, and various mercury lamps, carbon arc lamps, xenon lamps, metal halide lamps, ultraviolet fluorescent lamps, etc. may be used. I can do it.

Next, the upper colored photosensitive layer (1) is washed with water and dried. Washing can be easily done by using shower water or by rubbing lightly with a sponge. Drying is performed with warm air at a temperature of 80°C or lower. Further, as shown in FIG. 2B, an image separation element negative mask (4) is brought into close contact, and the underlying colored photosensitive layer (3) is exposed in the same manner through the intermediate layer (2). Next, the intermediate layer resin is softened, immersed in a solvent that does not dissolve the photosensitive layer, and developed with shower water, whereby the underlying photosensitive layer in contact with the intermediate layer (2) is removed, except for the image area already formed on the upper layer. The unexposed area (non-image area) of (3) is removed by washing with water together with the upper intermediate layer (2).

As a result, as shown in FIG. 3C, a double-dot, soft-tone image separation element similar to that shown in FIG. 3 is formed. By selecting the colorant of the colored photosensitive layer, for example, the upper layer,
If the lower layer is the same color as white colorant or black colorant,
A monochromatic, soft-tone image separation element is obtained, and the upper layer is a black colorant.

If the lower layer is a white colorant, two-color double dots can be obtained. It goes without saying that if colorants of various tones are used, multicolor images of various tones can be formed and can be used for various purposes other than image separation screens.

The image forming material of the present invention will be explained in more detail.

The support used in the present invention is not particularly limited as long as it is a transparent support. Polyethylene terephthalate, polypropylene, polyethylene, polyvinyl chloride as transparent supports.

Examples include plastic films such as polystyrene, polycarbonate, and triacetate, and glass plates.

Although the colored photosensitive layer may be directly coated onto these supports, in order to improve adhesion, it is preferable to perform corona discharge treatment, coating with a brimer treatment agent, or adhesion processing using a combination of these in advance.

As a primer treatment agent, depending on the type of support,
Phenolic resin, polyester resin.

Urethane resin, vinylidene chloride-vinyl acetate copolymer,
Vinylidene chloride-acrylonitrile copolymer, olefin emulsion, vinyl acetate emulsion, etc., alone or in combination, are preferably coated on the support at 0.1 to 2.
It is used with a treated film thickness of 0.09/m.

As a sensitizer in the colored photosensitive layer that is soluble in water and becomes insolubilized by light, it is important that it not be dissolved in the solvent used when coating the intermediate layer or the organic solvent that softens the intermediate layer resin before or after the photocuring reaction. It also has photoreactivity, water developability, and storage stability.

Film strength and safety after photocuring are required. After careful consideration and satisfying the above conditions and considering the wide selection range of organic solvents, we found that among various water-developable, negative-positive type sensitizers, we selected a material made of water-soluble resins and diazo resins. Sensitizers and modified polyvinyl alcohols of the present invention could be used.

However, in the case of a sensitizer made of a water-soluble resin and a diazo resin, the color tone of the colorant is contaminated by the color tone of the diazo resin, making it difficult to obtain a pure color tone of the added colorant. In particular, even if an attempt is made to obtain a white image using a white pigment such as titanium dioxide, a clear white image cannot be obtained besides the color tone contamination caused by the diazo resin. On the other hand, when modified polyvinyl alcohol was used, there was no color contamination as described above, and the pure color tone of the colorant was obtained. Furthermore, it had excellent storage stability and sensitivity to light.

The modified polyvinyl alcohol referred to in the present invention has the following general formulas (I) and (II) [wherein R1 and R2 each independently represent a hydrogen atom or an alkyl group, and Y() is an acid Indicates a conjugated basic ion, the numeric value represents an integer from 1 to 6, and n
represents O or 1] At least one selected from a stilpyridinium group (stilbazolium group) and a stilquinolinium group represented by the following is contained as a photosensitive component addition group. Such photosensitive modified polyvinyl alcohol is
-5761 and 56-5762 and JP-A-56-
It can be produced using the method described in No. 11906.

In the present invention, vinyl acetate-based emulsions such as vinyl acetate-polyvinyl alcohol emulsions and vinyl acetate-acrylic copolymer emulsions are added to the modified polyvinyl alcohol for the purpose of improving the adhesion to the support and the water resistance of the obtained images. A mixture of cellulose derivatives such as carboxymethylcellulose and droxycellulose, polyvinyl alcohol, polyvinylpyrrolidone, casein, gelatin, polyacrylamide, polyethylene oxide, polyacrylic acid and its salts, polymethacrylic acid and its salts, and other water-soluble resins. You can use it as well. The coloring agent can be selected from a wide range of colors, including pigments that can be dispersed in water, water-soluble dyes, and alcohol-soluble dyes.

In addition to the above ingredients, the colored photosensitive layer also contains stabilizers, thermal polymerization inhibitors, preservatives to prevent dark reactions, leveling agents, antifoaming agents, surfactants, etc. to improve coating properties. can be added as necessary. The colored photosensitive layer thus obtained has excellent storage stability and sensitivity to light, and
Due to its high resolution, it is possible to form delicate images that are difficult to form using conventional printing methods.

That is, while the image resolution of printing methods is usually 65 lines/inch to 100 lines/inch, the present invention has an image resolution of 150 to 200 lines/inch.

The intermediate layer used in the present invention is made of a hydrophobic and organic solvent-softening resin. The resin that forms the intermediate layer is
The solvent for coating it does not dissolve the colored photosensitive layer before photocuring, and it also contains at least one organic solvent that softens the intermediate layer resin without dissolving the colored photosensitive layer after photocuring. It can be used in a wide variety of ways. For example, polyamide resin, polyvinyl acetate, polyvinyl butyral,
Isopropyl alcohol was selected as the organic solvent for softening polyvinyl formal and the like. In addition, polyvinylidene chloride, vinyl chloride-vinyl acetate copolymers, various cellulose derivatives, etc. could be used by selecting butyl acetate as the organic solvent for softening them. In addition, an organic solvent for softening the intermediate layer, a solvent used for coating the intermediate layer resin, and fine particles that do not dissolve in water and do not have reactivity with the colored photosensitive layer and the intermediate layer resin are added to the intermediate layer. Pigments can be added.

For example, inorganic pigments such as silica, titanium dioxide, clay, zinc oxide, barium sulfate, etc. can be used. Furthermore, by using various colored pigments, the color tone can be reproduced by mixing the color with the color tone of the colored photosensitive layer above or below the intermediate layer.
By painting with a white pigment, it is also possible to cancel out the color tone of the underlying colored photosensitive layer.

Although the present invention limits the number of colored photosensitive layers to two, it is also possible to obtain a coloring photosensitive layer consisting of three or more layers by sequentially providing intermediate 9 colored photosensitive layers according to the present invention thereon. sell.

In this case, a more sophisticated image separation screen can be formed by simply increasing the number of pattern exposure and development processing steps according to the present invention.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to obtain soft image resolution elements that are difficult to obtain with conventional printing methods, and since a photosensitive material is used, the resolution is superior to that of conventional printing methods.
Extremely fine image resolving screens can be formed. Furthermore, by changing the color tone of the colored photosensitive layer, a two-color image can be formed.

〔Example〕

Examples of the present invention are shown below, but the present invention is not limited to these Examples. Incidentally, all parts of 9% are based on weight.

Example 1 Solution A (blimmer processing solution) Solution B (white photosensitive layer solution) Solution C (intermediate layer forming solution) After drying Solution A, the film thickness becomes approximately 1μ on a transparent polyethylene terephthalate film with a thickness of 100μ. It was applied using a Mayer bar and dried at 100°C for 1 minute.

Next, Solution B was applied thereon using a Mayer bar to a dry film thickness of 2 μm, and dried at 80° C. for 2 minutes. Further, Solution C was applied thereon using a Mayer bar so that the film thickness after drying was 1 μm, and dried at 80° C. for 1 minute. Furthermore, Liquid B was applied thereon again using a Mayer bar so that the film thickness after drying was 2 μm, and dried at 80° C. for 2 minutes to obtain a white image forming material.

Next, a 100 lines/inch 60% square dot negative mask was brought into close contact with the photosensitive layer coated surface of this white image forming material, and exposure was applied for 5 seconds from a distance of 1 TrL using a 2 KW ultra-high pressure mercury lamp, and then the unexposed areas were exposed. (Non-print area) 1.5K
A dissolution image is formed with room temperature water spouted from a nozzle pressurized to I/ci, and dried at 1 ffl at 70°C, resulting in a white halftone dot area ratio of 4.
An image inverted to 0% was obtained. Furthermore, on the middle layer 100
A negative mask of 40% lines/inch square dots was attached and exposed under the same exposure conditions, then immersed in butyl acetate for 5 seconds, and the non-image areas were immediately dissolved and imaged with water under the above conditions. At this time, the intermediate layer on the upper layer in contact with the non-image area was also removed at the same time, except for the portion where an image had already been formed on the upper layer.

After drying with warm air at 70°C, the density of the overlapping image of the upper and lower layers was measured using a microdensitometer. The results are as shown in Figure 6 (D + white transmission density Q, 60
, 02 black density 1.00>, a soft white screen was obtained.

Example 2 Liquid D (black photosensitive layer liquid) Everything was carried out according to Example 1, except that the upper white photosensitive layer in Example 1 was replaced with the black photosensitive layer of Liquid D.

The result was a double-dot decomposed image screen with a black upper layer and a white lower layer.

In addition, as a result of measurement with a microdensitometer, the seventh
The density was as shown in the figure (D + white transmission density 0.60
, Dz black transmission density 1.00>.

Example 3 Solution E (primer treatment solution) Solution F (white photosensitive layer solution) 10% alcohol solution 30 parts (D,
P500. Saponification degree 88%.

SbQ group introduction 3.82 mol%) Titanium dioxide aqueous dispersion 50% liquid 4 parts (Dainichiseika Aqua Fine AF White E-2) Isopropyl alcohol 6 parts water
60 part G
Solution (black photosensitive layer solution) N-methylstilbazolium (Sb Q> group-introduced modified polyvinyl alcohol 10% solution 45 parts (D,
P1400. Saponification degree 88%.

SbQ group introduction 1.48 mol%) Carbon rack aqueous dispersion 25% liquid 2 parts (manufactured by Dainichiseika@I Aqua Fine AF Black E-2B) Water
53 parts Solution H (intermediate layer forming solution) Solution E was applied to a transparent polyethylene terephthalate film with a thickness of 100μ using a Meyer bar so that the film thickness after drying was approximately 2μ, and dried at 100°C for 1 minute. . Liquid F was applied thereon using a Mayer bar so that the thickness after drying was 2 μm, and dried at 80° C. for 2 minutes. Further, Solution H was applied using a Mayer bar so that the thickness after drying was 1 μm, and dried at 80° C. for 1 minute. Then, Liquid G was applied thereon using a Mayer bar so that the thickness after drying was 2 μm, and dried at 80° C. for 2 minutes to obtain an image forming material.

After exposing a 2KW ultra-high-pressure mercury lamp for 25 seconds from a distance of 17 FL with a grid negative pattern mask formed with a spacing layer in close contact with a line width of 100 μ, the unexposed area (non-image area) was
．． An image was eluted with room temperature water jetted from a nozzle pressurized to 5 to 9/ai and dried to obtain a black grid pattern. Next, a negative pattern of the same grid was shifted by half a frame and contact exposure was carried out in the same manner.

The fogging time was 5 seconds. After that, it was immersed in isopropyl alcohol for 5 seconds, and then the non-printed areas were imaged by dissolution with water under the above conditions.

As a result, a double grid consisting of a black grid and a white grid was obtained.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a high-contrast image decomposition element, FIG. 2 is a cross-sectional view of a soft-contrast image decomposition element, FIG. 3 is a cross-sectional view of a soft-contrast image decomposition element according to the present invention, and FIG. 4 is a cross-sectional view of an image decomposition element according to the present invention. 5 (A>(B) and (C) are cross-sectional views showing the image forming method of the present invention; (A) is the image exposure step in FIG. 1; (B) is the cross-sectional view of the forming material; 2, (C) shows the soft-tone image separation screen. FIG. 6 shows the measurement results of the soft-tone white screen obtained in Example 1 of the present invention, and FIG. The measurement results of the double-dot separation image screen obtained in Example 2 are shown below.In the drawings 1... Colored photosensitive layer 2... Intermediate layer 3... Colored photosensitive layer 4... Image separation element negative mask Film basis procedure amendment (voluntary) July 9, 1985 1. Indication of the case 1985 Patent Application No. 15579 2. Name of the invention 3. Person making the amendment Relationship with the case Patent applicant address Whale 1-4-5 Marunouchi, Chiyoda-ku, Tokyo Name (234) Sanyo Kokusaku Pulp Co., Ltd. (1 other company)
4. Agent address: 16 Kanda Kita Jorimono-cho, Chiyoda-ku, Tokyo
101 English pill 3N Specification 1, Title of the invention Image-resolving screen forming method and image-forming material for use therein 2, Claims (1) Hydrophobic, water-resistant, organic solvent softening on a transparent support A colored layer is provided above and below the intermediate layer made of a resin having properties, and is soluble in water and insolubilized by light, and is insoluble in at least one organic solvent that softens the intermediate resin before and after the intermediate layer. A process in which an upper colored layer of a certain photosensitive material is pattern-exposed, and then the unexposed areas (non-image areas) are washed away and dried to form an image. ■ Furthermore, pattern exposure is performed again from above the intermediate layer to soften the intermediate layer resin and immerse the colored layer in an organic solvent that does not dissolve it. A process in which the exposed area (non-image area) is washed with water, removed together with the intermediate layer above it, and then dried. A method for forming an image separation screen, comprising: (2) Through an intermediate layer made of a resin having hydrophobicity, water resistance, and organic solvent softening property on a transparent support, [However, in the formula R
+ and Rz each independently represent a hydrogen atom or an alkyl group, ye represents a conjugated basic ion of an acid, ■ represents an integer from 1 to 6, and n represents 0 or 1] 1. An image forming material comprising a photosensitive layer containing as main components a modified polyvinyl alcohol having at least one selected from stilbazolium groups and stilquinolinium groups as a photosensitive component addition group and a colorant. 3. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to an image decomposition screen, more specifically, to a copy or photograph obtained by contacting an original picture when copying or transporting the picture. The present invention relates to a method for forming an image separation screen capable of adding a desired picture pattern and at the same time converting the density of the original image as a whole, and an image forming material used therein. [Prior Art] When copying a photograph, calligraphy, or other printed matter as an original picture, a specific pattern is added to the resulting copy.
At the same time, it is often requested that the shading of the original painting be converted as a whole. For example, when a photograph with strong gradation is copied using a copying machine, the resulting copy should have a moderate gradation as a whole. In such a case, an image separation screen formed by printing image separation elements on a transparent support using white ink or two types of ink, white ink and black ink, is placed on the original image,
Methods such as copying are used. Such an image decomposition screen is disclosed in Japanese Patent Application Laid-Open No. 59-10948.
listed in the number. However, since image separation screens formed by printing methods are subject to limitations on printing technology, it is generally difficult to obtain extremely fine image separation elements with high precision. Further, the cross section of the obtained image decomposition element does not have a density difference within the image decomposition element, as shown in FIG. 1, and has a high contrast. - As shown in Figure 2, if a soft image separation screen with a density distribution within the separation element is obtained, it is thought that the reproduction obtained by copying the original will have even gentler gradations. There is a demand for such a soft image resolution screen. [Problems to be Solved by the Invention] The present invention uses a photosensitive material to create an extremely fine image resolving screen that cannot be obtained by printing, and furthermore, as shown in FIG. It is an object to provide a method of forming a soft image separation screen by doubling and an imaging material for use therein. (Means and effects for solving the problems) The image forming material of the present invention has a hydrophobic support. A modified polyvinyl alcohol (hereinafter referred to as modified It is characterized by being provided with a photosensitive layer whose main components are polyvinyl alcohol (abbreviated as polyvinyl alcohol) and a colorant. The image forming material and image separation screen forming method of the present invention will be described with reference to the drawings. FIG. 4 is a cross-sectional view of the image forming material of the present invention. still,
The drawings are illustrative of typical models in order to make the invention easier to understand, and the invention is not limited to these drawings. An example of the image forming method of the present invention is shown in FIG. 5 (A>(B) and (C). That is, as shown in FIG. The light source used for exposure may be any light source that has a spectral energy that effectively makes the modified polyvinyl alcohol insolubilized in water, such as various mercury lamps, carbon arc lamps, and xenon lamps. , metal halide lamps, ultraviolet fluorescent lamps, etc. can be used. Next, the upper colored photosensitive layer (1) is washed with water and dried. Washing with water is easily carried out by rubbing lightly with shower water or a sponge. Drying. The process is carried out using hot air at a temperature of 80°C or less.Furthermore, as shown in the same figure (B), the image separation element negative mask (4) is brought into close contact with the lower colored photosensitive layer (3) through the middle till (2) and exposed in the same way. Next, the intermediate layer resin is softened, immersed in a solvent that does not dissolve the photosensitive layer, and developed with shower water. The unexposed area (non-image area) of the photosensitive layer (3) is removed by washing with water together with the upper intermediate layer (2).As a result, as shown in FIG. By selecting the colorant for the colored photosensitive layer, for example, the upper layer,
If the lower layer is the same color as white colorant or black colorant,
A monochromatic, soft-tone image separation element is obtained, and the upper layer is a black colorant. If the lower layer is a white colorant, two-color double dots can be obtained. It goes without saying that if colorants of various tones are used, multicolor images of various tones can be formed and can be used for various purposes other than image separation screens. The image forming material of the present invention will be explained in more detail. The support used in the present invention is not particularly limited as long as it is a transparent support. Polyethylene terephthalate, polypropylene, polyethylene, polyvinyl chloride as transparent supports. Examples include plastic films such as polystyrene, polycarbonate, and triacetate, and glass plates. Although the colored photosensitive layer may be directly coated onto these supports, in order to improve adhesion, it is preferable to perform corona discharge treatment, coating with a brimer treatment agent, or adhesion processing using a combination of these in advance. As a primer treatment agent, depending on the type of support,
Phenolic resin, polyester resin. Urethane resin, vinylidene chloride-vinyl acetate copolymer,
Vinylidene chloride-acrylonitrile copolymer, olefin emulsion, vinyl acetate emulsion, etc., alone or in combination, are preferably coated on a support in a range of 0.1 to 2.
It is used with a treated film thickness of 0g/TIL. The sensitizer that is soluble in water and becomes insolubilized by light in the colored photosensitive layer must not be mixed with the solvent used when coating the intermediate layer or the organic solvent that softens the intermediate layer resin before or after the photocuring reaction. Also important are photoreactivity, water developability, and storage stability. Film strength and safety after photocuring are required. As a result of intensive study, taking into account the above conditions and the wide selection range of organic solvents, we found that among various water-developable negative-positive type sensitive materials, water-soluble resins and diazo resins are the most popular. The sensitizers and the modified polyvinyl alcohol of the present invention could be used. However, in the case of a sensitizer made of a water-soluble resin and a diazo resin, the color tone of the colorant is contaminated by the color tone of the diazo resin, making it difficult to obtain a pure color tone of the added colorant. In particular, even if an attempt is made to obtain a white image using a white pigment such as titanium dioxide, a clear white image cannot be obtained due to the color tone contamination caused by the diazo resin. On the other hand, when modified polyvinyl alcohol was used, there was no color contamination as described above, and the pure color tone of the colorant was obtained. Furthermore, it had excellent storage stability and sensitivity to light. The modified polyvinyl alcohol referred to in the present invention has the following general formulas (1) and (II) [wherein R+ and R2 each independently represent a hydrogen atom or an alkyl group, and Yθ is the conjugate base of an acid. - represents an integer from 1 to 6, and n represents 0 or 1. It is contained as a base. Such photosensitive modified polyvinyl alcohol is
-5761 and 56-5762 and JP-A-56-
It can be manufactured using the method described in 11906@. In the present invention, vinyl acetate-based emulsions such as vinyl acetate-polyvinyl alcohol emulsions and vinyl acetate-acrylic copolymer emulsions are added to the modified polyvinyl alcohol for the purpose of improving the adhesion to the support and the water resistance of the obtained images. and cellulose derivatives such as carboxymethylcellulose and human oxyethylcellulose, polyvinyl alcohol, polyvinylpyrrolidone, casein, gelatin, polyacrylamide, and polyethylene oxide. Water-soluble resins such as polyacrylic acid and its salts, polymethacrylic acid and its salts, etc. may be used in combination. The coloring agent can be selected from a wide range of colors, including pigments that can be dispersed in water, water-soluble dyes, and alcohol-soluble dyes. In addition to the above ingredients, the colored photosensitive layer also contains stabilizers, thermal polymerization inhibitors, preservatives to prevent dark reactions, leveling agents, antifoaming agents, surfactants, etc. to improve coating properties. can be added as necessary. The colored photosensitive layer thus obtained has excellent storage stability and sensitivity to light, and
Due to its high resolution, it is possible to form fine images that are difficult to form using conventional printing methods. That is, while the image resolution of printing methods is usually 65 lines/inch to 100 lines/inch, the present invention has an image resolution of 150 to 200 lines/inch. The intermediate layer used in the present invention is made of a hydrophobic and organic solvent-softening resin. The resin that forms the intermediate layer is
The solvent for coating it does not dissolve the colored photosensitive layer before photocuring, and it also contains at least one organic solvent that softens the intermediate layer resin without dissolving the colored photosensitive layer after photocuring. It can be used in a wide variety of ways. For example, polyamide resin, polyvinyl acetate, polyvinyl butyral,
Polyvinyl formal etc. could be used by selecting isobrobyl alcohol as the organic solvent for softening. In addition, polyvinylidene chloride, vinyl chloride-vinyl acetate copolymers, various cellulose derivatives, etc. could be used by selecting butyl acetate as the organic solvent for softening them. In addition, an organic solvent for softening the intermediate layer, a solvent used for coating the intermediate layer resin, and fine particles that do not dissolve in water and do not have reactivity with the colored photosensitive layer and the intermediate layer resin are added to the intermediate layer. Pigments can be added. For example, inorganic pigments such as silica, titanium dioxide, clay, zinc oxide, barium sulfate, etc. can be used. Furthermore, by using various colored pigments, six colors can be reproduced to match the color tones of the colored photosensitive layer above or below the intermediate layer;
By painting with a white pigment, it is also possible to cancel out the color tone of the underlying colored photosensitive layer. Note that although the number of colored photosensitive layers is limited to two in the present invention, by further sequentially providing the intermediate layer 1 colored photosensitive layer according to the present invention on top of the colored photosensitive layer, a layer having three or more colored photosensitive layers can be obtained. sell. In this case, a more sophisticated image separation screen can be formed by simply increasing the number of pattern exposure and development processing steps according to the present invention. [Effects of the Invention] As described above, according to the present invention, it is possible to obtain soft image resolution elements that are difficult to achieve with conventional printing methods, and since a photosensitive material is used, the resolution is higher than that of conventional printing methods. Excellent in
Extremely fine image resolving screens can be formed. Furthermore, by changing the color tone of the colored photosensitive layer, a two-color image can be formed. [Example] Examples of the present invention are shown below, but the present invention is not limited to these Examples. Incidentally, all parts of 9% are based on weight. Example 1 Solution A (blimmer processing solution) Solution B (white photosensitive layer solution) Solution C (intermediate layer forming solution) After drying Solution A, the film thickness becomes approximately 1μ on a transparent polyethylene terephthalate film with a thickness of 100μ. It was applied using a Mayer bar and dried at 100°C for 1 minute. Next, Solution B was applied thereon using a Mayer bar to a dry film thickness of 2 μm, and dried at 80° C. for 2 minutes. Further, Liquid C was applied thereon using a Mayer bar so that the film thickness after drying was 1 μm, and dried at 80° C. for 1 minute. Furthermore, liquid B was again applied on top of it using a Mayer bar so that the film thickness after drying was 2μ, and dried at 80°C for 2 minutes.
A white imaging material was obtained. Next, a negative mask with a square dot area ratio of 100 lines/inch and 60% was brought into close contact with the photosensitive layer coated surface of this white image forming material, and exposed for 5 seconds from a distance of 1 m using a 2 KW ultra-high pressure mercury lamp. After that, the unexposed area (non-image area) is imaged by elution with room temperature water jetted from a nozzle pressurized to 1.5 Kt/d, and dried with warm air at 70°C to obtain a white dot area ratio of 40%. An inverted image was obtained. Furthermore, 100 on the middle layer
A negative mask with a square dot area ratio of 40% lines/inch was placed in close contact with the mask, exposed under the same exposure conditions, then immersed in butyl acetate for 5 seconds, and immediately covered with water under the above conditions. A dissolution image appeared. At this time, the intermediate layer on the upper layer in contact with the non-image area was also removed at the same time, except for the portion where an image had already been formed on the upper layer. The density of the overlapping image of the upper layer and lower layer of the sample dried with warm air at 70°C was measured using a microdensitometer, and the results are as shown in Figure 6 (D + white transmission density 0.60. D2 A soft white screen with a white transmission density of 1.15) was obtained. Example 2 Liquid D (black photosensitive layer liquid) Everything was carried out according to Example 1, except that the upper white photosensitive layer in Example 1 was replaced with the black photosensitive layer of Liquid D. The result was a double-dot decomposed image screen with a black upper layer and a white lower layer. In addition, as a result of measurement with a microdensitometer, the seventh
The density was as shown in the figure (D + white transmission density 0.60
, Dz black transmission density 1.00). Example 3 Solution E (blimmer processing solution) Solution F (white photosensitive layer solution) Solution G (black photosensitive layer solution) Solution H (intermediate layer forming solution) After drying Solution E on a transparent polyethylene terephthalate film with a thickness of 100μ It was coated with a Meyer bar to a film thickness of about 2 μm and dried at 100° C. for 1 minute. Liquid F was applied thereon using a Mayer bar so that the thickness after drying was 2 μm, and dried at 80° C. for 2 minutes. Furthermore, Solution H was applied using a Mayer bar to a dry thickness of 1 μm, and dried at 80° C. for 1 minute. Then, Liquid G was applied thereon using a Mayer bar so that the thickness after drying was 2 μm, and dried at 80° C. for 2 minutes to obtain an image forming material. After exposing a 2KW ultra-high-pressure mercury lamp for 25 seconds from a distance of 1m with a grid negative pattern mask formed by a spacer layer in close contact with a line width of 100μ, the unexposed area (non-image area) was
An image was eluted with room temperature water jetted from a nozzle pressurized to 9/6d, and dried to obtain a black grid pattern. Next, a negative pattern of the same grid was shifted by half a frame and contact exposure was carried out in the same manner. Exposure time was 5 seconds. After that, it was immersed in isopropyl alcohol for 5 seconds, and then the non-printed areas were imaged by dissolution with water under the above conditions. As a result, a double grid consisting of a black grid and a white grid was obtained. 4. Brief description of the drawings FIG. 1 is a cross-sectional view of a high-contrast image decomposition element, FIG. 2 is a cross-sectional view of a soft-contrast image decomposition element, and FIG. 3 is a cross-sectional view of a soft-contrast image decomposition element according to the present invention. Figure 4 is a cross-sectional view of the image forming material of the present invention, Figures 5 (A), (B), and (C) are cross-sectional views showing the image forming method of the present invention; (B) shows the second image exposure step, and (C) shows the soft image separation screen. FIG. 6 shows the measurement results of the soft white screen obtained in Example 1 of the present invention, and FIG. 7 shows the measurement results of the double-dot separated image screen obtained in Example 2 of the invention. In the drawings 1... Colored photosensitive layer 2... Intermediate layer 3... Colored photosensitive layer 4... Image separation element Negative mask film agent
Patent attorney Kiyoshi Minoura,) Ichiwara

Claims (2)

[Claims] (1) An intermediate layer made of a resin having hydrophobicity, water resistance, and organic solvent softening properties is placed on a transparent support, and above and below the intermediate layer is soluble in water and becomes insolubilized by light, and an intermediate resin is placed before and after the intermediate layer. For a photosensitive material provided with a colored layer that is insoluble in at least one type of organic solvent to be softened, [1] After exposing the upper colored layer in a pattern, the unexposed area (
The process of forming an image by washing away the non-image areas) and drying them. [2] Furthermore, pattern exposure is performed again from above the intermediate layer, and after softening the intermediate layer resin and immersing it in an organic solvent that does not dissolve the colored layer, the colored layer of the lower layer is removed, except for the portion where the image is formed on the upper layer. The process of washing away the unexposed areas (non-image areas) with water and drying them together with the upper intermediate layer. A method for forming an image separation screen, comprising: (2) The following general formulas (I) and (II) ▲ mathematical formulas, chemical formulas, tables, etc. are applied on the transparent support via an intermediate layer made of a resin having hydrophobicity, water resistance, and organic solvent softening properties. There are▼...(I) ▲There are mathematical formulas, chemical formulas, tables, etc.▼...(II) [However, in the formula, R_1 and R_2 each independently represent a hydrogen atom or an alkyl group, and Y^■ , represents a conjugated basic ion of an acid, m represents an integer of 1 to 6, and n represents 0 or 1. An image forming material comprising a photosensitive layer containing modified polyvinyl alcohol as a base and a colorant as main components.