JPS63133143A - Image forming method - Google Patents

Abstract

PURPOSE:To obtain a positive image of an original picture with high sensitivity by executing image exposure by active rays from a transparent base side. CONSTITUTION:A colored image forming material which is formed by laminating a thermoweldable layer 2 and a colored recording layer 3 successively on a transparent base 1 and the colored recording layer 3 of which contains a quinonediazide compd. is subjected to image exposure by active rays then to a developing process, by which the colored image is formed thereon. The colored image is transferred onto the surface to be transferred of an image receptive material to form the transferred image. The image exposure by the active rays is executed from the base 1 side. The active rays passing the base 1 and the layer 2, therefore, arrive at the layer 3 to generate sufficient photodecomposition. Since a difference in solubility in a developing soln. between the exposed part and the nonexposed part is thereby exhibited, the image is obtd. with the high sensitivity.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an image forming method in color proofing and the like.

[Conventional technology]

In multicolor printing, it is common to perform color proofing by proof printing as a pre-process of main printing.

Conventionally, color proofing sheets made by the overlay method and the subprint method are known, but these have drawbacks such as a slightly darker image, a different texture from the actual printed material, and weak image strength.

Various attempts have been made to improve this. For example, Japanese Patent Application Laid-Open No. 47-41830 discloses a colored image-forming material in which a heat-fusible layer and a colored layer containing a quinonediazide compound are laminated on a transparent support. It is disclosed that a colored image is formed by image exposure and development processing, and this colored image is transferred onto a transfer surface of a separately prepared image receiving material to form a transferred image.

[Problem that the invention seeks to solve]

However, in the conventional method described in the above-mentioned publication, when the colored recording layer is imaged and exposed, the coloring agent contained in the colored recording layer absorbs light during the exposure, so the exposed area and the non-exposed area must be exposed without large actinic ray energy. The area cannot be clearly demarcated from the exposed area.

Therefore, the sensitivity is low, and it is difficult to clearly form images with small halftone dots and thin lines.

On the other hand, when a transferred image is formed, the colored recording layer is exposed and the image is exposed, so that the transferred image becomes a reverse image with respect to the original image.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an image forming method that is highly sensitive and that can obtain a normal image with respect to an original image.

[Means for solving problems]

The above purpose is to image-expose a colored image forming material in which a heat-fusible layer and a colored recording layer are sequentially laminated on a transparent support, and the colored recording layer contains a quinonediazide compound to actinic rays, and then develop the colored image-forming material. In an image forming method in which a colored image is formed by processing, and this colored image is transferred onto a transfer surface of an image-receiving material to form a transferred image; Ru.

[Function] In the present invention, the transparent support is used for image exposure. Therefore, the actinic rays that pass through the transparent support and the transparent heat-adhesive layer reach the colored recording layer. In this case, the colored recording layer will undergo sufficient photodecomposition even if the amount of actinic light reaches only the interface with the heat-adhesive layer, and the exposed and non-exposed areas will show a difference in solubility in the developer. It becomes highly sensitive.

On the other hand, since the transparent support is exposed to light, the transferred image becomes a normal image with respect to the original image, which is convenient.

[Specific structure of the invention]

The present invention will be explained in more detail below.

The colored image forming material according to the present invention, as shown in FIG. 1, has a transparent support 1, a transparent thermal adhesive layer 2, and a colored recording layer 3 having a quinonediazide compound laminated thereon.

In addition, as a colored recording layer, as shown in FIG. 4, an uncolored recording layer 3A having a quinonediazide compound containing no colorant is laminated on the heat-adhesive layer 2, and a colored recording layer 3A containing a colorant is further layered thereon. It may be a two-layer colored recording layer in which the recording layer 3B is laminated.

As the transparent support for the colored image-forming material used in the present invention, polyester films, especially two-wheel stretched polyethylene terephthalate films are preferred from the viewpoint of dimensional stability against water and heat, but acetate films, polyvinyl chloride films, and polystyrene films are preferred. , polypropylene film, polyethylene film may also be used. Furthermore, these supports may be used as they are, but in order to improve the transferability of the image after image formation, they may be subjected to mold release treatment using an appropriate oil-repellent substance such as silicone resin, fluorine resin, or fluorine surfactant. Alternatively, an undercoat layer of about 1 μm thick of alcohol-soluble polyamide, alcohol-based nylon, partially esterified styrene/maleic anhydride copolymer, polyvinyl alcohol, etc. may be provided.

The heat-fusible layer used in the present invention is transparent and non-adhesive at room temperature, but is preferably one that can be heat-fusible in the temperature range of 80°C to 160°C.

For this purpose, the following film-forming thermoplastic resins having a softening point of 70°C to 140°C are used. For example, olefin (co)polymer, vinyl chloride (co)polymer, vinylidene chloride (co)polymer, vinyl acetate (co)polymer, (meth)acrylic acid ester (co)polymer, styrene/(meth)polymer Acrylic ester copolymers, polyesters, vinyl butyral resins, chlorinated rubber, cellulose derivatives, preferably styrene/(meth)acrylic ester copolymers, polyesters, etc., which may be used alone or in combination; may be used in combination with other resins or plasticizers.

The thickness of the heat-fusible layer is suitably in the range of 1 to 20 μm, particularly preferably in the range of 2 to 8 μM. The thickness of the heat-fusible layer formed on the heat-fusible layer should be equal to or greater than the thickness of the colored recording layer or the combined thickness of the colored (recording) layer and the non-colored recording layer, which will be described later. When a colored image is heated, pressed, and transferred onto the surface of an image-receiving material, even the fine non-image areas, that is, the narrow area of the heat-fusible layer surrounded by large image areas, are effectively transferred to the image-receiving material. It is fused to the surface and a uniform and good transferred image can be obtained.

The colored recording agent in the present invention includes a quinonediazide compound.

Specifically, 1,2-benzoquinonediazide-4-sulfonyl chloride, 1,2-naphthoquinonediazide-4
-manifonyl chloride, 1,2-naphthoquinonediazide-5-sulfonyl chloride, 1,2-naphthoquinonediazide-6-sulfonyl chloride and hydroxyl group and1
A compound obtained by condensing an 0r amino group-containing compound is preferably used.

Examples of the hydroxyl group-containing compound include trihydroxybenzophenone, dihydroxyanthraquinone, bisphenol A, phenol novolak resin, resorcin benzaldehyde condensation resin, and pyrogallol acetone condensation resin. In addition, examples of amino group-containing compounds include aniline, p-aminodiphenylamine, p-aminobenzophenone, 4I4'-diaminodiphenylamine, 4
．． Examples include 4-diaminohensiphenone.

Regarding quinonediazide compounds, including what is described here, Shiteha, Sarani J, KO3AR, “LightSe
rSitive System” (Wiley &
5oz, Net II York.

1965) and "Photosensitive Polymer" by Inui Yonematsu (Kodansha, 1977).

The paitander resin to be mixed with the quinonediazide compound is preferably an alkali-soluble polymer compound. For example, phenol novolac resin, cresol novolac resin,
Examples include styrene-maleic anhydride copolymers, polymers with carboxyl groups such as cellulose acetate hydrogen phthalate, polyhydroxybenzoate, polyvinylhydroxypenzole, acrylic resins with carboxyl groups, polyhydroxystyrene resins, shellac, and the like.

A dye or a pigment is added as a coloring agent to the colored recording layer 3 or the colored layer 3B. In particular, when used for color proofing, pigments and dyes with a tone matching the gold, yellow, magenta, cyan, and black required are required, but other materials such as metal powders, white pigments, and fluorescent pigments are also required. used. These can be used alone or in combination of two or more.

The following examples are some of the many pigments and dyes known in the art (C,1, means color index).

Victoria Pure Blue (C,R, 42595) Auramine (C,R, 41000) Cathylone Brilliant Flavin (C,1, Heshisuk 1)
3) Rhodamine 6GCP (C, 1,45160) Rhodamine B (C, T, 45170) Safranin 0K70:10
0(C,1,50240) Erioglaucine X(C,1
, 42080) Fast Black HB (c, ?, 26
150) 1201 Lionor Yellow (C, L 21
090) Lionor Yellow GRO (C, 1, 2109
0) Shimla Fast Yellow 8GF (C, 1, 21
105) Penjijin-i x Low 4T-5640 (C, r
, 21095) Shimla Firth Trend 4015 (
C, 1, 12355) Lionol Resodo 7B4401 (
C, T, 15830) First Gen Blue TGR-
L (C, 1,74160) Lionor Blue SM (C,
1,26150) Mitsubishi Carbon Blank MA-1,00 Mitsubishi Carbon Blank #30. #40. #50 The ratio of the colorant/binder and components other than the colorant in the colored photosensitive layer used in the present invention is determined by those skilled in the art, taking into consideration the target optical density and the removability of the colored photosensitive layer to the developer. It can be determined by a known method. For example, in the case of dye, the content is suitably 5% to 75% by weight, and in the case of pigment, the content is suitably 5% to 90% by weight.

In addition, the thickness of the colored photosensitive layer can be determined by a method known to those skilled in the art based on the target optical density, the type of colorant (dye, pigment, carbon black) used in the colored photosensitive layer, and its content. However, within the allowable range, the thinner the colored photosensitive layer is, the higher the resolution and the better the image quality. Therefore, the film thickness is 1μ
It is preferably used in the range of 1 to 4 μm, particularly 1 to 4 μm.

Various additives may be added to the above-mentioned colored recording agent according to various purposes.

For example, to improve coating properties, surfactants such as cellulose alkyl ethers, fluorine surfactants, silicone-based compounds, and acid anhydrides such as glutaric anhydride and phthalic anhydride are used as sensitizers. Plasticizers such as phosphate esters and phthalate esters can be added as physical property improvers.

On the other hand, in the present invention, since the transparent support is image-wise exposed, it is preferable to provide a CE (contrast enhancement) layer in order to compensate for the decrease in resolution caused by passing through the transparent support and the heat-adhesive layer. . This CE layer is preferably provided between the heat-fusible layer and the colored recording layer or the uncolored recording layer, rather than between the transparent support and the heat-fusible layer.

In this case, the CE layer is, for example, B or F.

Griffing, p, R, West, Poly
m, Eng, Sci, +23947 (1983)
, Donald C., Hofer et al., 5
PrE, 409°108 (1984), L, F.
Hal'le, J., Vac., Sci., Tec.
hnol,.

83, 322 (1985), nitrones, polysilanes, diazonium salts, and quinonediazide compounds as colored recording agents.

Also, “9586 chemical products” (Kagaku Kogyo Nipposha).

1986), the ultraviolet absorber described on pages 769 to 774,
For example, pt-butylphenyl salicylate, 2-hydroxy-4-methoxybenzophenone, 2'-(2'-
Hydroxy-5-methoxyphenyl)benzotriazole and the like can also be used.

Those with film-forming properties are applied alone, and those without film-forming properties are dissolved in a solvent together with a binder resin with good compatibility and coated on a transparent support.

The thickness of the CE layer is 0.1 to 10 μm, preferably 0.2 to 10 μm.
It is 4 μm.

By the way, when the structure shown in FIG. 4 is used as a colored image forming material, when the uncolored recording layer 3A is exposed to light, the uncolored recording layer 3A does not contain a coloring agent, so the coloring agent is not contained in the uncolored recording layer 3A. There is no difference in absorbance of actinic rays, and sensitization is achieved between four colors. Furthermore, since the colorant does not absorb light, there is no decrease in sensitivity and high sensitivity is achieved. ~ Also, above the uncolored recording layer 3A, a colored recording layer 3B containing a photosensitive material in addition to a coloring agent is provided. Image formation is mainly determined by the difference in the exposure solubility of the uncolored recording layer 3A to the developer, but the colored recording layer 3A
Since B also contains a photosensitive material (Mi composition), there is a clear difference in solubility in the developer between the exposed and non-exposed areas, resulting in side edges and missing images when developed. This does not occur, and a wide development latitude can be obtained.

On the other hand, the colored recording layer 3B may be replaced with a coloring agent that does not contain a photosensitive material and only contains a coloring agent.

The above-mentioned colored image forming material is suitably used, for example, in the following image forming method.

That is, first, a decomposition mask 4 is placed on the surface of the transparent support 1 of the colored image forming material, and actinic rays are irradiated from above to imagewise expose it. Repeat this for the other three colors as well. Next, each exposure method material is liquid-developed with a developer (Fig. 2), washed with water, and dried, and the first color of the material is superimposed on the transfer surface of the image-receiving material 5, and the image is transferred to the image-receiving material. , as shown in FIG. 3, the transparent support 1 is peeled off to obtain a transferred image of the first color. The images of the remaining three colors are matched and stacked, and the remaining three transfers are performed in the same manner to form the final color proof.

As the above image-receiving material, paper such as high-quality paper, art paper, coated paper, plastic film such as polyester film, acetate film, polypropylene film, metal film such as aluminum film or copper film, or composite materials thereof are used. .

〔Example〕

Next, examples will clarify the effects of the present invention.

(Example I) An undercoating liquid of the following composition was coated on a 75 μm thick biaxially stretched polyethylene terephragm film with coach-in-blonde (
Using R, D, 5 specialties (manufactured by U, S, A), the coating was applied to a dry film thickness of 0.3 μm and dried to prepare a support having a releasable surface.

Alcohol-soluble polyamide 8.5 g (Toshisha CM8000) Nitrocellulose R31/2 0.05 g (
30% IPA (mixed cotton) Methanol 400g Methyl Cellosolve 100g Next, a heat-fusible layer coating solution having the following composition was applied so that the dry film thickness was 5.0 μm.

Styrene/n-butyl acrylate copolymer 20 g Methyl ethyl ketone 100 g Further, four colored photosensitive outer layer dispersions having the following compositions were prepared and coated so that the dry film thickness was 1.5 μm mark.

Esterified product of pyrogallol/acetone condensation resin and 1,2-naphthoquinonediazide-5-sulfonyl chloride [Photoreceptor I) 2g phenol and m-, p
- Copolycondensation resin of mixed cresol and formaldehyde [binder resin 1] 8 g
Pigment 3g Seiriki First Yellow H-7055 (manufactured by Dainichiseika) Seiriki First Carmine 1483 (manufactured by Dainichiseika) Cyanine Blue 4920 (manufactured by Dainichiseika) Mitsubishi Carbon Black MA-100 (manufactured by Mitsubishi Kasei Chemical) ) Methyl cellosolve 100 g or more of the colored image forming material was obtained by overlaying each color separation mesh positive film on the polyethylene terephthalate film surface using a resistor pin at an accurate position, and then using a control wedge for sensitivity measurement and resolution evaluation. (UGRA
PCW 82. Continuous tone wedge...density difference 0.15
13 levels of gray scale, micro line,
・・Put a 4-70μ line circular punch) in close contact with 2k
Perform image exposure from a distance of 50 cm using a W supersonic pressure mercury lamp Jet, Light 2000 (oak fabrication fracture) to completely remove the three stages of the continuous tone wafer after development.
It was developed with a 2% potassium metasilicate aqueous solution at 25° C. for 30 seconds. In this way, a four-color image-forming colored material that faithfully reproduced the color separation mask was obtained.

Next, the obtained yellow color image is accurately brought into contact with the coated paper of the image receiving sheet using register pins, and passed between a pair of nip rolls heated at 100°C to transfer the color image to the coated paper. The polyethylene terephthalate film on the side was peeled off.

Color images were simultaneously transferred in the order of magenta, cyan, and plaque to obtain a multicolor proofing sheet on coated paper. The obtained color proof was very good and very close to a printed matter that reproduced the 12μ lines in the original image.

The evaluation results of sensitivity (exposure time at which three stages of the continuous tone wafer are completely removed by development) are shown in Table 1.

(Comparative Example 1) The same procedure as in Example 1 was carried out except that the colored image forming material of Example 1 was used and a color separation positive film and a control wedge were brought into close contact with the surface of the colored photosensitive layer. A multicolored color proofing sheet with reverse image was obtained. The sensitivity evaluation results are shown in Table 1.

From the results of the Examples and Comparative Examples shown in Table 1 and above, it can be seen that the image forming method of the present invention is an excellent method in which a color proofing sheet with a high sensitivity and a normal image relative to the original image can be obtained.

(Example 2) A 08-layer coating solution having the following composition was coated onto a biaxially stretched polyethylene terephthalate film having a thickness of 75 μm using a coach-in-blonde coating, and dried to a dry film thickness of 0.5 μm.

Hereinafter, a release surface, a heat-adhesive layer, and a colored photosensitive layer were coated on the CE layer in the same manner as in Example 1, and exposure, development, and transfer were performed in the same steps as in Example 1. A color proofing sheet was obtained which was extremely close to a printed matter and reproduced the 10μ line in the original image.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to obtain a transferred image with high sensitivity and which is a normal image with respect to the original image.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an example of the layer structure of a colored image forming material according to the present invention, FIGS. 2 and 3 are explanatory diagrams of an image forming method, and FIG. 4 is an example of a layer structure of another colored image forming material. FIG. DESCRIPTION OF SYMBOLS 1... Transparent support, 2... Heat-fusible layer, 3... Colored recording layer, 3A... Uncolored recording layer, 3B... Colored recording layer Patent applicant: Konishiroku Photo Industry Co., Ltd. Company Mitsubishi Chemical Industries, Ltd.

Claims (1)

[Claims] (1) A colored image-forming material in which a heat-fusible layer and a colored recording layer are sequentially laminated on a transparent support, and the colored recording layer contains a quinonediazide compound is imagewise exposed to actinic light, and then developed. An image forming method in which a colored image is formed by performing the above steps, and the colored image is transferred onto a transfer surface of an image-receiving material to form a transferred image; characterized in that the imagewise exposure with the actinic rays is carried out from the side of the transparent support. Image forming method.