JPS6270839A - Diazo copying material - Google Patents

Abstract

PURPOSE:To solve problems such as unevenness of coating or repelling of coating liquid, and to obtain a product having superior uniformness in the development of color and superior texture by using a precoated layer contg. polyoxyethylene tribenzyl phenyl ether. CONSTITUTION:In a diazo copying material provided with a precoated layer consisting primarily of fine silica particles and binder between a base material and a diazo photosensitive layer, polyoxyethylene tribenzyl phenyl ether expressed by the formula (I) is incorporated into the precoated layer. Preferred polyoxyethylene tribenzyl phenyl ether is one having ca.10-20 degree of polymn. (n), and suitable proportion by weight thereof is 1-10pts.wt. per 100pts.wt. binder. By this method, generation unevenness of coating or repelling of the coated liquid is retarded effectively even in the coating at high speed. The trouble of foam generation is not caused in the stage of formation of the precoating liquid. Moreover, the texture of the product is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to improvements in diazo copying materials that utilize a coupling reaction (color-forming reaction) between a diazo compound and a coupler.

[Prior art]

Generally, diazo copying materials are formed by providing a photosensitive layer comprising a diazo compound and a coupler on a support directly or via a precoat layer.

Conventionally, in diazo copying materials, auxiliary additives have been used together with diazo compounds and couplers to improve the problems of coating unevenness and repellency of the coating liquid during manufacturing, and to improve product formation and obtain high quality products. It is known that saponin, isopropyl alcohol, etc. are used in combination. However, such conventionally commonly used auxiliary additive components have the disadvantage that their addition effects are small and that they have strong foaming properties. Therefore, various surfactants have been studied as substitutes for such compounds, but most surfactants cause aggregation, precipitation, tar-like substances, etc. when added to photosensitive solutions. It has a fundamental flaw in that it is easy to occur. Also.

It is also possible to add a surfactant to the precoat layer, but in this case, the disadvantage is that the precoat solution foams a lot, which reduces productivity, and the formation improvement effect is also small.6. If a silicone oil or the like is added as an antifoaming agent to the precoat layer in order to improve the foam, the problem of repellency of the photosensitive liquid will occur during application of the photosensitive liquid, which is not preferable.

By the way, in recent years, with the spread of diazo copying materials, there has been an increasing need in the market for higher contrast and improved image reliability in diazo copying materials, and there has also been a growing trend toward high-speed coating in the production of diazo copying materials. ing. However, in conventional diazo copying materials, fine particle silica, starch, clay, etc. are added to the image density improver as a precoat forming liquid, and a polymer compound is added to the binder. When applied under certain coating conditions, there are problems such as poor formation and lack of uniform color development.
The market needs as described above were not fully satisfied.

〔the purpose〕

The present invention solves the problems of coating unevenness and repelling of the coating liquid during manufacturing in diazo copying materials, and provides products with excellent uniform color development and good texture, as well as diazo copying materials with increased productivity. The purpose is to provide

〔composition〕

According to the present invention, in a diazo copying material in which a precoat layer mainly composed of fine silica particles and a binder is provided between a support and a diazo photosensitive layer, the precoat layer is represented by the following general formula (1). A diazo copying material is provided which is characterized in that it contains polyoxyethylene tribenzyl phenyl ether.

General formula (1) (wherein n is an integer of 10 to 20) In the diazo copying material of the present invention, polyoxyethylene tribenzyl phenyl ether represented by the above general formula is used as an auxiliary additive component in the precoat layer. It is characterized by the use of As the polyoxyethylene tribenzyl phenyl ether in this case, it is appropriate to use one having a degree of polymerization n of about 10 to 20. If the weight degree n is less than 10, the penetrating power into the support will be too strong, and the polyoxyethylene tribenzyl phenyl ether itself will penetrate into the back surface of the support, while if the polymerization degree n exceeds 20, it will not penetrate into the support. Penetration power is weak, foaming property increases, and uniform application property decreases. In the present invention, the polyoxyethylene benzyl phenyl ether is used in an amount of 1 to 100 parts by weight per 100 parts by weight of the binder.
Preferably, it is used in a proportion of 10 parts by weight. According to the research conducted by the present inventors, when using a precoat layer containing such polyoxyethylene tribenzyl phenyl ether, it is possible to effectively suppress the occurrence of coating unevenness and repelling of the coating solution even during high-speed coating. In addition, it has been found that it does not cause the problem of foaming during the formation of the precoat liquid, and has various advantages such as improving the formation of the product.

In addition to the above-mentioned polyoxyethylene tribenzyl phenyl ether, the precoat layer used in the present invention includes silica, alumina, aluminum silicate, barium sulfate, titanium dioxide,
Inorganic and organic fine powder pigments such as starch, polystyrene resin powder, styrene-acrylic acid copolymer powder, etc. can also be added. Furthermore, as the binder for the precoat layer, conventionally known binders described below can be used as appropriate.

The diazo photosensitive layer in the present invention may be a one-component system, that is, one containing only a diazo compound, or a two-component system,
That is, it may contain a diazo compound and a coupler.

As the diazo compound and coupler component used in the present invention, those conventionally used can be used as they are.

That is, as a diazo compound, for example, 4-diazo-1
-dimethylaminobenzene, 4-diazo-1-diethylaminobenzene, 4-diazo-1-dipropylaminobenzene, 4-diazo-1-methylbenzylaminobenzene, 4-diazo-1-dibenzylaminobenzene, 4-
diazo-1-ethylhydroxyethylaminobenzene,
4-Diazo-1-diethylamino-3-methoxybenzene, 4-diazo-1-dimethylamino-2-methylbenzene, 4-diazo-1-benzoylamino-2,5-jethoxybenzene, 4-diazo-1-morpholino Benzene, 4-diazo-1-morpholino-2,5-jethoxybenzene, 4-diazo-1-morpholino-2,5-dibutoxybenzene, 4-diazo-1-anilinobenzene,
4-Diazo-1-dimethylamino-3-carboxybenzene, 4-diazo-1-tolylmercapto-2,5-
Metal halides (e.g. zinc chloride,
Examples include double salts with 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. do not have.

Examples of couplers include resorcinol, phloroglucin, 2,5-dimethyl-4-morpholinomethylphenol, 3-hydroxycyanoacetanilide, parasulfoacetanilide, 1-benzoylamino-8-hydroxynaphthalene-3,6-disulfonamide, 2 ,3-
Dihydroxynaphthalene, sodium 2,7-dihydroquinonaphthalene-3,6-disulfonate, sodium 2,5-dihydroxynaphthalene-6-sulfonate, sodium 1-hydroxynaphthalene-4-sulfonate, 1-amino-3
-hydroxynaphthalene-3,6-disulfonamide,
Naphthol AS, Naphthol AS-D, 2-hydroxynaphthalene-3-biguanide, 2-hydroxy-3-
naphthoic acid morpholinopropylamide, 2-hydroxy-3-naphthoic acid ethanolamide, 2-hydroxy-
3-Naphthoic acid-N-dimethylaminopropylamide hydrochloride, 2,4.2',4'-tetrahydroxydiphenyl,2,4.2',4'-tetrahydroxydiphenyl,2,4.2',4 '-tetrahydroxydiphenyl sulfoxide and the like.

In addition to the one or more materials, various auxiliary additive components commonly used in diazo copying materials can be used in the present invention. Examples of such agents include ethylene glycol, triethylene glycol, etc. as development accelerators; sodium naphthalene monosulfonate, sodium naphthalene disulfonate, etc. as storage improvers;
Sodium naphthalene trisulfonate, sulfosalicylic acid, cadmium sulfate, magnesium sulfate, cadmium chloride, zinc chloride, etc.; As antioxidants, urea-based compounds and thiourea-based compounds; As solubilizing agents, caffeine, thioferrin, etc.; Acid stabilization As agents, citric acid, tartaric acid, sulfuric acid, oxalic acid, boric acid, phosphoric acid, pyrophosphoric acid, etc.; as image density improving agents, talc, kaolin, silica, starch,
Examples include organic and inorganic fine particles such as clay, calcium carbonate, magnesium hydroxide, styrene resin fine particles, and urea-formalin condensate resin fine particles.

Further, in the present invention, a small amount of saponin may also be added.

In addition, a binder is usually applied to the precoat layer and the diazo photosensitive layer, and examples of the binder include high polymers such as polyvinyl alcohol, methylcellulose, polymethacrylate, polyacrylate, polyvinyl acetate, polystyrene, and polyurethane. Conventional methods such as solution type and emulsion type containing molecules can be applied.

To produce the diazo copying material of the present invention, a precoat layer coating solution containing silica, a binder, and polyoxyethylene tribenzyl phenyl ether is coated onto a support such as paper, synthetic paper, or plastic film by a conventional coating method. After coating and drying, a photosensitive layer coating solution containing a diazo compound may be coated and dried.

Furthermore, in the case of a two-component system, the diazo compound and the coupler can be supported on a support as separate layers. Furthermore, the diazo compound and coupler used in the present invention can also be applied after being microencapsulated by a conventionally known method, if necessary. The ratio of the diazo compound to the coupler used is usually 1:0.1 to 10 by weight.
is within the range of

〔effect〕

By using the precoat layer containing polyoxyethylene tribenzyl phenyl ether, the diazo copying material of the present invention solves various problems such as uneven coating, repelling of the coating liquid, and foaming during its production, and also improves the quality of the product. Since the formation improvement effect is also achieved, the product quality is significantly improved.

In addition, since the formation of the precoat layer coating solution does not cause the problem of foaming, the product can be manufactured efficiently.

〔Example〕

Next, the present invention will be explained in more detail with reference to Examples.

Example 1 [Pre-coat layer coating solution] Polyvinyl acetate emulsion (solid content 50%) 10 g Silica fine particles (Fuji Davison Co., Ltd.; Cyroid 244) 5 g Polyoxyethylene tribenzyl phenyl ether (n = 15)
A precoat layer coating solution was prepared by adding 0.3 g of water to the above composition to make a total volume of 100 ml.

[Diazo photosensitive layer coating liquid]

Tartaric acid 2g Caffeine 2g Thiourea
1g naphthalene 2,7-
Sodium disulfonate 1g 2-hydroxy-3-naphthoic acid morpholinopropylamide 2g 4-morpholino-2,5-dibutoxybenzenediazonium chloride 1/2ZnCQ2 2g isopropyl alcohol 1g saponin
0.Lump Water was added to the above composition to make the total amount 100 mff to prepare a photosensitive layer coating solution.

Next, on high-quality paper (58 g/rn"), first, the pre-coat layer coating solution was dried with a wire bar, and the adhesion amount was 2 g.
/ m, dried to form a precoat layer, and applied the photosensitive layer coating solution thereon with a wire bar so that the coating amount after drying was 0.8 g/rn'.
It was dried to form a photosensitive layer.

Comparative Example 1 A diazo photosensitive paper was prepared in the same manner as in Example 1 except that polyoxyethylene tribenzyl phenyl ether was omitted from the precoat layer forming liquid.

The precoat layer forming liquid of each sample obtained as described above was tested for high-speed coating properties (viscosity) and uniform color development.

The viscosity was determined using Toshiba System ■ Vismetron, and the liquid temperature was 30'.
The measurement was carried out under the conditions of C. In addition, the uniform color development test is
The color was completely developed using ammonia gas using a Ricoh SM-1500 copying machine and visually confirmed. The results are shown in Table-■.

Table -■

Claims (1)

[Claims] (1) A diazo copying material in which a precoat layer mainly composed of fine-particle silica and a binder is provided between the support and the diazo photosensitive layer, in which the precoat layer is formed of a polyoxygenate compound represented by the following general formula (I). A diazo copying material containing ethylene tribenzyl phenyl ether. General formula (I) ▲There are mathematical formulas, chemical formulas, tables, etc.▼ (In the formula, n is an integer from 10 to 20.