JPS627044A - Two component diazo copying material - Google Patents

Abstract

PURPOSE:To make easy to see, coloring the color tone of an image part to a blue by incorporating 1-oxybenzotriazole to a photosensitive layer. CONSTITUTION:The titled material is comprised a diazonium salt, a coupler, a zinc chloride and the 1-oxybenzotriazole derivative, by constituting mentioned above, the color tone of the image is colored to the blue, and is strengthened a contrast of the picture towards the surface of a ground, thereby obtaining the obvious copy Thus, in the formula, R is 1-3C alkyl group, a halogen atom, a hydrogen atom, a sulfonic acid group or its salt.

Description

[Detailed description of the invention] LLL ship This invention relates to a two-component diazo copying material.

BACKGROUND ART Hitherto, two-component diazo copying materials containing benztriazole in the photosensitive layer have been known to improve the color tone, but the disadvantage is that the effect diminishes over time.

It has also been proposed to add metal salts or thiourea to improve the color tone, but the storage stability of the photosensitive layer is poor.
The problem was that discoloration and fading could not be sufficiently prevented.

Purpose This invention aims to improve the color tone of diazo photosensitive paper.

The structure of the present invention to achieve the above object is a two-component diazo copying material in which the photosensitive layer contains as its components a diazonium salt, a coupler, zinc chloride and a 1-oxybenztriazole derivative. The effect is that a diazo copying material with a bluish tone and good contrast is obtained. Moreover, the amount of thiourea added can be small, and the side effects of thiourea, such as deterioration in storage stability and promotion of discoloration and fading, do not occur.

As the support for this diazo copying material, general base paper for diazo copying, resin film, synthetic paper, etc. are used. Further, a precoat layer containing silica, starch, clay, etc. dispersed in a binder is provided on these supports, if necessary.

The 1-oxybenztriazole derivative used in this invention has the following structure.

However, R is suitably an alkyl group of 01 to C3, halogen, hydrogen, sulfonic acid, or a salt thereof.

As the diazo compound used in this invention, those conventionally used can be used, such as 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-benzoylamino-2,5-jethoxybenzene, 4-diazo-1-morpholino-2,5-jethoxybenzene, 4-diazo-1-anilinobenzene, 4
-Diazo-1-tolylmercapto-2,5-jethoxybenzene, 4-diazo-1,4-methoxybenzoylamino-2,5-jethoxybenzene, 4-diazo-1
- Diethylamine - Double salts of chlorides of diazo compounds such as 3-methoxybenzene and metal halides (zinc chloride, cadmium chloride, tin chloride), and sulfuric acid, boron tetrafluoride, hexafluorophosphoric acid, etc. of the diazo compounds Examples include, but are not limited to, salts of strong acids.

In addition, the coupling component that can form the diazo compound and the azo dye image develops a blue or violet color,
Any material that can be applied to ordinary two-component diazo photosensitive materials can be used. Specific examples include the following.

For example, 2-hydroxy-3-naphthoic acid amide, 2.
3-dihydroxynaphthalene, 2,3-dihydroxynaphthalene-6-sulfonic acid soda, 2-hydroxy-3
-Naphthoic acid ethanolamide, 2,5-dihydroxynaphthalene-6-sulfonic acid sodium, 2-hydroxy-
3-naphthoic acid dimethylaminoethylamide, 2-hydroxy-3-naphthoic acid morpholinopropylamide, 2
-Hydroxy-3-naphthoic acid ethanolamide-5-
Sodium sulfonate, 2-hydroxy-3-naphthoic acid diethylaminoethylamide, 6-bromo-2-hydroxy-3-naphthoic acid diethylaminoethylamide,
2-Hydroxy-3-naphthoic acid dibrobylaminopropylamide, 6-medoxy 2-hydroxy-3-naphthoic acid diethylamitube Oviramide, 6-chlor-2
-Hydroxy-3-naphthoic acid morpholinoethylamide, 2-hydroxy-3-naphthoic acid piberidinopropylamide, sodium 2-hydroxynaphthalene-6-sulfonate, sodium 2-hydroxynaphthalene-7-sulfonate, 1- Biguanidino-7-hydroxynaphthalene, 1-biguayudino-8-hydroxynaphthalene,
4-methoxy-1-naphthol, sodium 1-hydroxynaphthalene-4-sulfonate, α-naphthol, β
- naphthol etc.

In order to actually produce the diazo copying material of the present invention, a two-component type photosensitive layer (with a solid content of 0.5 to 2.0
q, /+') may be provided.

In addition, if necessary, a pre-coat layer (with solid strength @90.3
~2.0 g/I') can also be provided.

In the process of manufacturing this two-component type diazo copying material, the amount of the 1-oxybenztriazole derivative added to the photosensitive layer is suitably in the range of o,oos to 0.150Q/l<2>. 0.005 (less than J/l112,
The initial purpose of this invention was not fully realized, and on the contrary, 0.15
When the amount is more than 0 g/s', the solubility in the photosensitive solution decreases, and furthermore, the long-term storage stability becomes poor.

Moreover, the above-mentioned 1-oxybenztriazole derivative is
A single species may be used, or two or more species may be used in combination.

On the other hand, the appropriate amount of zinc chloride used in combination with the 1-oxybenztriazole derivative is 0.1 to 3 g/I12.

If it is less than 0.19/m 2 , the effect of the present invention will not be fully exhibited, and if it is more than 3Q/12, zinc chloride will become supersaturated, the liquid stability will deteriorate, and the solid content will tend to precipitate.

Addition of the 1-oxybenztriazole derivative to the photosensitive layer has a great effect in the presence of zinc chloride even in a small amount.

Therefore, without reducing the storage stability of diazo photosensitive materials,
Furthermore, the color tone of the image area can be made bluish without causing discoloration or fading. By making this color tone bluish, the contrast with the background color increases, making the copy easy to read.

Hereinafter, the present invention will be specifically explained with reference to Examples.

Example 1 The following components were mixed with water to prepare a photosensitive layer forming solution (11).

Citric acid 30g 2.3-dihydroxynaphthalene-6-sulfonic acid Thorium 30g 4-diazo-N
, N-dimethylaniline chloride・1/2 Zn
Cl2 12G diethylene glycol 5
0 (7thiourea 40g saponin 0.5g methylene blue
0.1g isopropyl alcohol 5g 1-oxybenztriazole 2g zinc chloride eog silica
1 og of this photosensitive layer forming liquid was applied onto white base paper (support) for photosensitive paper and dried to give a solid content of about 2 g/
A photosensitive layer of I2 was provided to obtain a two-component diazo copying material.

This diazo copying material was superimposed on an original having a suitable image, exposed to light and developed with ammonia gas using a commercially available dry type copying machine. The color tone of the dye image was a clear blue.

When measured with a color difference meter manufactured by Nippon Denshoku Kogyo A, the b value (-
The larger the value, the stronger the blue tint) was -55.5.

Further, after being left at room temperature for three months, this sample was developed and the color difference was measured, and the b value was -55.0.

Comparative Example 1 A copying material was prepared in the same manner as in Example 1 except for the 1-oxybenztriazole used in Example 1, and the color tone and density were determined. The bl was 1.45.6. The b value after a month was -45.0.

Comparative Example 2 A diazo copying material was obtained in the same manner as in Example 1 except that 1-oxybenztriazole in Example 1 was removed and benztriazole was added instead.

The b value was -53.7. Also, the b value after 3 months is -
It was 48.1.

Effects As explained above, according to this invention, the image has a bluish tone and has a strong contrast with the background, making it possible to make copies that are easy to read.The effect does not disappear even after storage. It has the remarkable effect of not reducing color quality or promoting discoloration or fading.

Claims (1)

Claims: A two-component diazo copying material, characterized in that the photosensitive layer contains as its components a diazonium salt, a coupler, zinc chloride and a 1-oxybenztriazole derivative.