JPS59107351A - Diazo copying material - Google Patents

Abstract

PURPOSE:To enhance dispersibility of silica and color developing density sufficiently even in the case of using a comparatively small amt. of silica by forming a diazo photosensitive layer on a precoat layer contg. a silane coupling agent formed on a support. CONSTITUTION:In a diazo type copying material using a precoat layer contg. silica between a support and a diazo photosensitive layer, a silane coupling agent is incorporated in this precoat layer. A compd. especially suitable for this silane coupling agent is represented by the formula shown in the figure in which R1-R4 are each H, C, vinyl, methacryloxy, glycidoxy, or the like and contain no unsubstd. silane. It is exemplified by gamma-glycidoxypropyltriepoxysilane, methylchlorosilane, methacryloxysilane, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a diazo type copying material in which a silica-containing precoat layer is provided between a support and a diazo photosensitive layer.

PRIOR ART A diazo type photosensitive layer is well known in which a precoat layer is provided between a support and a diazo photosensitive layer, and silica is contained in this precoat layer for the purpose of improving image density.

However, the silica that can be used is limited by its physical properties. For example, those with a cap ratio of 0.3 or more cannot be used in practice due to large sedimentation. Oil absorption amount is 2s OmA/1
If the value is 001 or less, the color density is low. Regarding the particle size, particles as small as 0.1μ or as large as 10μ or more have poor dispersibility.

On the other hand, although silica is effective in improving the quality of diazo type copying materials, it has been necessary to use an excessive amount of silica in consideration of the selection capacity. If an excessive amount is used, the viscosity increases and uniform dispersion and uniform coating properties become insufficient, making it difficult to achieve the desired purpose.

Therefore, in the silica-containing precoat layer or photosensitive layer,
The inclusion of a surfactant was attempted, but the penetration of the precoat layer or photosensitive layer coating solution was severe and the side effect of backing out of the photographic material occurred, so the amount of surfactant used was limited and silica It was not possible to improve the dispersibility to the optical level. Furthermore, conventional surfactants tend to aggregate depending on the composition of the precoat layer coating solution or the photosensitive Wt coating solution.

Another option is to use a thickener, but 9. Since uniform adhesion in the coating layer is insufficient, no improvement in color development or hairiness can be expected.

Purpose The present invention was made to solve these problems, and its purpose is to improve the dispersibility of the curing force and prevent selective adsorption, thereby achieving sufficient color repulsion even with a relatively small amount of silica. The object of the present invention is to provide a diazo type copying material that can be improved.

(In other words, the present invention is a diazo film in which a silica-containing precoat layer is provided between a support and a diazo photosensitive layer,
The T-type copying feather is characterized in that the precoat layer contains a silane coupling agent.

Particularly preferable silane coupling agents for use in the present invention are those having the following general formula, for example.

R1 (R1y R1!) R3p R4 is hydrogen, R,
-St -R4 represents an alkyl group, chlorine, vinyl group, mekuacrylooxy, cyclic epoxy group, glycidoxy, mercapto, amino, diamino, uride, methoxy, ethoxymethoxy group, R,, R2゜R3+ R4 are the same However, it does not include unsubstituted silane, although it may be different. ) Specific examples of those coated with the above general formula include γ-crisitooxypropyltriepoxysilane, γ-aminopropyltriethoxysilane, r-uridopropyltriethoxysilane, vinyltrimethoxysilane, methylchlorosilane, Aminosilane, epoxylan, methylchlorosilane, mercaptosilane, trichlorosilane,
Examples include methyltrichlorosilane, dimethyldichlorosilane, trimethylchlorosilane, methyldichlorotetrasilane, and methyltrichlorosilane, which are easily dispersed or dissolved in water.

Since the use of this silane coupling agent improves the dispersibility of silica and the adhesion of silica to paper, the limitations imposed by the physical properties of silica as described above are greatly alleviated. Therefore, any silica can be used between the main halls. However, considering the quality of the material to be handled, it is desirable that the particle size of the silica be 10 μm or less.

Further, the amount of the silane coupling agent used is preferably 0.01 to 1 inch. If the amount used is less than the above amount, the effect of dispersion and adhesion of silica to the support will be small, and if the amount used above the above amount is used, the effect will only change and the cost will increase.b Diazo compounds and couplers used in the photosensitive layer are conventionally used. You can use whatever you have.

Examples of the diazo compound include 4-diazo-1-dimethylaminobenzene, 4-diazo-1-diethylaminobenzene, 4-diazo-1-diethylaminobenzene, 4-diazo-1-diethylaminobenzene, and 4-diazo-1-diethylaminobenzene.
-Diazo-1-methylbenzylaminobenzene, 4-diazo-1-dibenzylaminobenzene, 4-thiaso 1
-ethylhydroxyethylaminebenzene 5.4-diazo-1-diethylamino-3-methoxyben7ane, 4-
Diazo-1-dimethylamino-2-methylbenzene, 4
-cyaso-i-cyylamino-2,5-jethoxybenzene.

4-Diazo-1-morpholinobenzene, 4-diazo-1
-morpholino-2,5-jethoxybenzene, 4-diazo-1-morpholino-2,5-dibutoxybenzene, 4
-Sia/”-1-7 dilinobenzene, 4-diazo-1-
Diazo compounds such as 7methylamino-3-carzoxybenzene, 4-diazo-1-tolylmercap)-2,5-jethoxybenzene, and 4-diazo-1,'4-methoxybenzoylamino-2,5-jethoxybenzene. Examples include double salts of chlorides of compounds with metal halides (eg, zinc chloride, cadmium chloride, tin chloride, etc.), and salts of the diazo compounds with strong acids such as sulfuric acid, boron tetrafluoride, and hexafluorophosphoric acid.

Examples of coupling components include resorcin, phloroglucin, 2-methylresorcin, phenylmethylpyrazolone, 2,5-dimethyl-4-morpholinomethylphenol, 3-hydroxycyanoacetanilide, nozorasulfoacetanilide, 1-benzoylamino- 8-Hydroxynaphthalene-3,6-disulfonamide 2.2
-dihydroxynaphthalene, 2,7-dihydroxynaphthalene-3,6-disulfonic acid 7-1'', 2,3-dihydroxy-6-sulfonic acid sodium, 2,5-dihydroxynaphthalene-6-sulfonic acid, l- Sodium hydroxynaphthalene-4-sulfonate, 1-amino-3
-hydroxynaphthalene-3,6-disulfonamide,
Naphthol AS, naphthol As-D, 2-hydroxynaphthalene-3-biguanide, 2-hydroxynaphthoic morpholinozolopyramide, 2-hydrokinaphthoic ethanolamide, 2-hydroxynaphthoic acid-N
-dimethylaminozorobilamide hydrochloride, 2,4.2'
.

4'-tetrahydroxydiphenyl, 2,4,2'
.

Examples include 4'-te)rahydroxydiphenyl sulfoxide.

Further, the photosensitive layer and the precoat layer may contain a feeding agent, a lubricant, other auxiliary agents, and the like.

To obtain the diazo photographic material of the present invention, silica, a silane coupling agent, etc. are dissolved or dispersed in a solvent to prepare a precoat layer coating solution, and a diazo compound, a coupling component, etc. are dissolved or dispersed in a solvent to form a photosensitive layer. Prepare each coating solution and apply it to the support (
It is sufficient to sequentially apply the coating onto a plastic film, plastic film, etc. and dry it.

Examples are shown below.

Example 1 Precoat liquid formulation silica (particle size approximately 5μ) 40g γ-glycidoxyprobyltrieboxysilane
0.5 & polyvinyl acetate emulsion; y
1oof! .

Water 800
I After stirring the above precoat liquid, water was further added to bring the total amount to 11.

Dipropylene glycol 3 og alcohol Stone acid 25 g thiourine 2 (1 2,3-dihydroxynaphthalene-6-sulfonic acid sodium 30.?
4-(N-ethyl-N-hydroxyethylaminebenzene)diazonium chloride zinc chloride double salt
10I chloride 11L lead
10.9 Saponi 10. iy water 5oo
After mixing and dissolving y or more ingredients, add more water to bring the total amount to 1
It was.

Next, dry the above pre-coat liquid onto the base paper for copy paper. ↓The amount is about 31I/lrt. After coating, apply the photosensitive liquid at 1.51/n? A diazo type photographic material (Example 1) was prepared by coating and drying to a certain extent.

In addition, Examples 2 and 3 and Comparative Examples 2 and 3 were prepared in the same manner as in Example 1 except that the pre-coat liquid was as follows.
I have created a shrine how to handle it.

Example 2 Silica (particle size approximately 5μ) 40gγ-aminopropyltriethoxysilane 5yHo! j Vinyl acetate emulsion 10 (1 water)
8009 (after dispersion,
Water was added to the mixture to make the total amount 1]. ) Example 3 Silica (particle size approx. 5μ) 40g Vinyltrimethoxysilane II Polyacetic acid vinyl emulsion 1001I Water
soo, p (After dispersion, water was further added to bring the total amount to 11.) Comparative Example 1 Silica (particle size approximately 5μ) 40.9 Polyacetic acid emulsion 100g water
5oooy (After dispersion, water was further added to bring the total amount to 11.) Comparative Example 2 Silica (particle size approximately 5μ) 4ogβ-naphthalenesulfonic acid formalin condensate) IJium salt (
anionic surfactant) 0.2. p polyacetic acid emulsion 100I water
800 g (After dispersion, water was further added to make the total amount 11.) Next, a transparent or translucent original having an ultraviolet ray-sharpening image was placed on the above copying material, exposed to a mercury lamp, and then exposed to an ammonia atmosphere. When developed in a medium, the products of the present invention (Examples 1 to 3) produced copies with clear, bluish-purple color and high density.

In addition, the performance of the dispersion time and dispersibility of silica, the adhesion of silica on the support, image concealment, and formation are as shown in the figure below, and the product of the present invention has superior performance compared to the comparative example. Indicated.

(The following is a blank space) Effects As described above, the use of the shishin coupling agent improved the dispersibility of silica and its adhesion to the support, and at the same time, excellent image performance was obtained.

1981 % Permit Application No. 2189872, Name of the invention Diazo copying fee3, Relationship with the case of the person making the amendment Patent applicant: Tokyo Metropolitan University IJ'-ku Nakamagome 1-3-6 (674) Co., Ltd. Ricoh - Representative η 1) Hiro 4, Agent Z, Subject of amendment 7, Amend the name of the invention "Diazo type copying material" in the description of the contents of the amendment to "Diazo copying material".

that's all

Claims (1)

[Claims] 1. A diazo type copying material comprising a silica-containing precoat layer between a support and a diazo photosensitive layer, characterized in that the precoat layer contains a silane coupling agent.