JPH01319742A - Two component type diazo copying material - Google Patents

Abstract

PURPOSE:To obtain an inexpensive copying material by incorporating a polyvinyl chloride/acrylic ester copolymer resin as binder into a precoated layer and making the use of many kinds of diazo compds. and couplers unnecessary. CONSTITUTION:A precoated layer and a photosensitive layer containing primarily a diazo compd. and a coupling component are formed on a supporting body in the title two component type diazo copying material. A polyvinyl chloride/ acrylic ester copolymer resin is contained in the precoated layer as binder. An inexpensive copying material is provided with such material since a semi-dry type diazo copying material causing no whitening is obtd., moreover, many kinds of diazo compds. and couplers are not required in the compsn.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a two-component diazo copying material, and more particularly to a two-component diazo copying material that improves the "whitening" phenomenon that occurs in a semi-dry development process. .

[Prior Art] A semi-dry development process is known as a process for developing two-component diazo copying materials. In this semi-dry development process, the developer components are alkaline components (e.g., organic bases such as monoethanolamine, jetanolamine, and triethanolamine, and inorganic alkalis such as potassium metaborate and potassium carbonate) and organic solvents (e.g., Add a small amount (usually 5 q/metre or less) of an alkaline developer whose main solvent is a polyhydric alcohol (such as ethylene glycol, ethylene glycol monomethyl ether, or its ether) to the copying material.
This method involves coating and developing.

Since this semi-dry development process uses a solvent-based developer, when copying is performed especially when the humidity of the usage environment is low, a phenomenon is observed in which the normally blue color of the image gradually changes to grayish-white. This phenomenon is called "whitening."

If such a whitening phenomenon occurs, it has the disadvantage that it cannot be used as a copy.

Conventionally, a method for improving this problem has been to use multiple types of photosensitizers and coloring agents (diazo couplers), but this has the drawback of high material costs because multiple types are mixed.

[Problems to be Solved by the Invention] The present invention solves the problem of "whitening" in the above-mentioned semi-dry development process.
The object of the present invention is to provide a two-component diazo copying material which prevents this phenomenon.

[Means for Solving the Problems] According to the present invention, in a diazo copying material in which a precoat layer and a photosensitive layer containing a diazo compound and a coupling component as main components are provided on a support, the precoat layer binds A two-component type diazo copying material is provided which is characterized in that it contains a vinyl chloride-acrylic acid ester copolymer resin as an agent.

The binder used in the precoat layer in the present invention has a vinyl chloride-acrylic acid ester copolymer resin as its main component.

The copolymerization ratio of this copolymer is preferably in the range of 30 to 70% by weight of acrylic ester based on monomer units. In addition, the number of carbon atoms in the ester group of acrylic acid ester is 4 to 1.
A range of 6 is preferred. When the range of the copolymerization ratio and the range of the number of carbon atoms in the ester group of the acrylic ester are within the above-mentioned ranges, the effect of preventing the "whitening" phenomenon is excellent and the deterioration of fading property is small as a semi-dry diazo copying material, which is preferable.

In the two-component diazo copying material of the present invention, the precoat layer contains concentration reinforcing agents such as fine silica powder, starch, and organic fillers as components other than the above-mentioned specific binder.
Auxiliary additives such as waxes are used, and these can be the same as those conventionally used in precoat layers. Further, although it is essential to use a vinyl chloride-acrylic acid ester copolymer resin as a binder, other hydrophilic resins such as polyvinyl alcohol, starch, and casein can be used as auxiliary binders.

Adhesion as a precoat layer is 1 to 3 C1 in dry state.
/m is preferable.

As the diazo compound and coupler (coupling component) used in the photosensitive layer of the present invention, those conventionally used can be used as they are.

That is, examples of the diazo compound include 4-diazo-1-dimethylaminebenzene, 4-diazo-1-diethylaminobenzene, 4-diazo-1-dipropylaminobenzene, 4-diazo-1-methylbenzylaminobenzene, 4-diazo-1-dibenzylaminobenzene,
4-Diazo-1-ethylhydroxyethylaminobenzene, 4-diazo-1-diethylamine-3-methoxybenzene, 4-diazo-1-dimethylamino-2-methylbenzene, 4-diazo-1-benzoylamino-2, 5
-Diethoxybenzene, 4-diazo-1-morpholinobenzene, 4-diazo-1-morpholino-2,5-diethoxybenzene, 4-diazo-1-morpholino-2,5-
Dibutoxybenzene, 4-diazo-1-anilinobenzene, 4-diazo-1-dimethylamino-3-carboxybenzene, 4-diazo-1-tolylmercapto, 4-methoxybenzoylamino-2,5-jethoxy double salts of chlorides of diazo compounds such as benzene with metal halides (e.g. zinc chloride, cadmium chloride, tin chloride, etc.);
and salts of the diazo compounds with strong acids such as sulfuric acid, boron tetrafluoride, hexafluorophosphoric acid, etc., but are not limited to these, of course.

Examples of couplers include resorcinol, phloroglucin, 2,5-dimethyl-4-morpholinomethylphenol, 3-hydroxycyanoacetanilide, parasulfoacetanilide, 1-benzoylamino-8-hydroxynaphthalene-3,6-disulfonamide, 2 ,3-
Dihydroxynaphthalene, 2,7-dihydroxynaphthalene-3,6-sodium disulfonate, 2.

Sodium 3-dihydroxy-6-sulfonate, Sodium 1-hydroxynaphthalene-4-sulfonate, 1-Amino-
3-hydroxynaphthalene-3,6-disulfonamide, naphthol AS1 naphthol AS-D, 2-hydroxynaphthalene-3-biguanide, 2-hydroxy-3
-Naphthoic acid morpholinopropylamide, 2-1 nitroxy-3-naphthoic acid ethanolamide, 2-hydroxy-3-naphthoic acid-N-dimethylaminoprogolamide hydrochloride, 2,4,2°, 4°-tetrahydroxy Diphenyl, 2,4,2°, 4°-tetrahydroxydiphenyl sulfoxide, and the like.

In addition to the above-mentioned materials, various additives commonly used in diazo copying materials can be used in the present invention. For example, development accelerators such as ethylene glycol and triethylene glycol; storage improvers such as sodium naphthalene monosulfonate, sodium naphthalene disulfonate, sodium naphthalene trisulfonate, sulfosalicylic acid, cadmium sulfate, magnesium sulfate,
Cadmium chloride, zinc chloride, etc.; thiourea, urea, etc. as antioxidants; caffeine, thiopherin, etc. as solubilizers; citric acid, tartaric acid, oxalic acid, boric acid, phosphoric acid, pyrophosphoric acid, etc. as acid stabilizers may be added as appropriate. can.

[Function] In the two-component diazo copying material of the present invention, since the precoat layer contains vinyl chloride-acrylic acid ester copolymer resin as a binder, the whitening phenomenon is prevented in the semi-dry development process. .

[Example] Next, the present invention will be explained in more detail with reference to examples.

Example 1 The following precoat liquid was coated on a diazo base paper using a wire bar so that the coating amount was 2 CI/m after drying, and then dried to obtain a precoat layer.

Silica fine powder (particle size 3 μm > 3 parts by weight Vinyl chloride-2-ethylhexyl acrylate copolymer (solid content 50 wt%, monomer ratio (weight) vinyl chloride acrylate ester = 50:50) 5 parts by weight water, total amount 700 Part by weight.

Comparative Example 1 A precoat layer was formed in the same manner as in Example 1, but the resin was polyvinyl acetate (solid content: 50 wt%).

Comparative Example 2 Example 1 except that styrene-butyl acrylate copolymer (solid content 50 wt%, monomer ratio (weight) styrene:butyl acrylate = 50:50) was used as the binder resin.
A precoat layer was formed in the same manner as above.

Comparative Example 3 Same as Example 1 except that vinyl chloride-ethyl acrylate copolymer (solid content 50 wt%, monomer ratio (weight) vinyl chloride ethyl acrylate = 20:80) was used as the binder resin. A precoat layer was formed.

A photosensitive liquid having the composition shown below was coated on the precoat layer and dried to obtain a diazo copying material.

Tartaric acid 1 part by weight Caffeine 2 parts by weight Thiourea
1 part by weight Sodium naphthalene-2,7-disulfonate 1 part by weight 2-hydroxy-3-naphthoic acid morpholinopropylamide 2 parts by weight 4-morpholino-2
,5-dibutoxybenzenediazonium chloride・1
/2ZnCI22 Part by weight Isopropyl alcohol
1 part by weight saponin 0
．． Add water to 1 part by weight or more to make 700ml.

When this diazo copying material was copied using Ricoh's 5D-270 under environmental conditions of 20 DEG C. and 30% RH, the following results were obtained.

[Effects of the Invention] As is clear from the above description, the present invention not only provides a diazo copying material for semi-dry printing without whitening phenomenon, but also has advantages in that it does not require the use of many types of diazo compounds and couplers. A low-cost copying material can be obtained, and the present invention also has the advantage that it can be used in common with a precoat layer for other visual imaging processes (wet type, dry type).

Claims (1)

[Scope of Claims] (1) A diazo copying material in which a precoat layer and a photosensitive layer containing a diazo compound and a coupling component as main components are provided on a support, wherein the precoat layer uses vinyl chloride-acrylic as a binder. A two-component diazo copying material containing an acid ester copolymer resin. (2) A patent claim in which the vinyl chloride-acrylic ester copolymer resin contains an acrylic ester in a monomer unit in a range of 30 to 70% by weight, and the ester group of the acrylic ester has 4 to 16 carbon atoms. A two-component diazo copying material according to item 1. (3) A developing method according to claim 1 or 2, characterized in that an organic solvent is used as a developer.