JPS592022B2 - Diazo copying developer - Google Patents

Description

[Detailed description of the invention] The present invention relates to a wet or semi-dry diazo copying developer.

The wet method for developing two-component diazo copying materials is generally a method in which two-component diazo photosensitive paper is impregnated or coated with an alkaline aqueous solution containing an inorganic or organic alkaline compound as a main component.

In this method, the water in the developer gradually evaporates and crystals precipitate, resulting in the inability to always obtain stable copies, and the need to change the developer and clean the developing area at regular intervals. , which was extremely troublesome for the user. The semi-dry method for developing two-component diazo copying materials is generally a method in which a small amount of a solution containing an inorganic or organic alkaline compound as a main component in an alcohol-based organic solvent is deposited on the two-component diazo photosensitive paper and developed. be.

In this method, when an inorganic crystalline alkali component such as soda carbonate is used, the frequency of developer exchange and cleaning is reduced compared to the wet method, but evaporation of the solvent causes the same drawbacks as the wet method. Naturally, if a liquid organic alkaline component such as an amine is used, this problem will not occur, but due to the unique odor and remarkable oxidative coloring property of organic amines, the developer and copies may have a slight odor and coloring, making it difficult for users to use. In addition to causing discomfort, there are other drawbacks such as the copies are subject to severe discoloration and fading and stain the background. Unlike the developer used in the above-mentioned wet method, the present invention does not easily precipitate crystals even when the solvent evaporates, so there is almost no need to replace the developer or clean the developing area. The object of the present invention is to provide a diazo copying developer that can be applied to wet and semi-dry methods and does not impart odor or discoloration to copies unlike the developer used in dry methods.

That is, the developer of the present invention is characterized in that it contains one or more alkali metal salts or alkaline earth metal salts of aliphatic aminosulfonic acids as a developer.

Aliphatic aminosulfonic acid refers to an aliphatic compound having an amino group and a sulfonic acid group, and any alkali metal salt or alkaline earth metal salt thereof can be used in the present invention.

Specific examples include alkali metal salts such as aminosulfonic acid, aminomethanesulfonic acid, aminoethanesulfonic acid (taurine), aminopropanesulfonic acid, aminobutanesulfonic acid, aminopentanesulfonic acid, asterpine, cysteic acid, and homocysteic acid. Alternatively, alkaline earth metal salts such as sodium salts, potassium salts, lithium salts, magnesium salts, barium salts, etc. may be used alone or in combination of two or more. These series of compounds are extremely soluble in water and polyhydric alcohol-based organic solvents, and have strong deliquescent properties, so that their solutions can be made into alkaline solutions with high alkaline strength and almost no crystal precipitation.

When this is used as a developer for diazo copying materials, copies with rapid color development and high color density can be obtained. Furthermore, this developer is odorless and
It does not cause oxidative coloring unlike organic amine developers. In the developer of the present invention, water is suitable as a solvent when a wet method is used, and polyhydric alcohol or its ether is suitable when a semi-dry method is used.

Examples of polyhydric alcohols or ethers thereof include ethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, polyethylene glycol, propylene glycol, dipropylene glycol, tripropylene glycol, polypropylene glycol, glycerin, trimethylene glycol, tetramethylene glycol, butanediol. 1,5-pentanediol hexylene glycol, octylene glycol, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether ethylene glycol diethyl ether ethylene glycol isopropyl ether, ethylene glycol monobutyl ether,
Ethylene glycol dibutyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol dimethyl ether, diethylene glycol diethyl ether, triethylene glycol monomethyl ether, triethylene glycol monoethyl ether, tetraethylene glycol monomethyl ether, tetraethylene glycol monoethyl ether, propylene glycol Monobutyl ether, 1-butoxyethoxypropanol, etc. can be used alone or in combination.

Furthermore, in the semi-dry method, water can be mixed with these polyhydric alcohols or ethers in an amount of about 5 to 30% by weight to increase the solubility of the developer and improve color development.

If the proportion of water exceeds this range, drying after copying will be insufficient, resulting in an undried state, requiring an after-heater, which is not preferable as a semi-dry developer. The developer of the present invention can be used at a concentration of 1 to 50% by weight, preferably 5 to 30% by weight, based on the above-mentioned water and/or polyhydric alcohol.

The diazo photosensitive paper used in the present invention can be any commonly used two-component type paper, but in order to obtain particularly good color development and high-density copies, it is necessary to use 4-diazo-2 as a diazo compound.・5-diethoxymorpholinobenzene chloride, 4-diazo-2,5-dibutoxymorpholinobenzene chloride, 4-diazo-dipropylaniline chloride, 4-diazo-2,5-diethoxy-4-(4'-
It is effective to use zinc chloride double salts such as methoxy)penzoylaminobenzene chloride. Coupling components used with these diazo compounds include, for example, 2.
3-dihydroxynaphthalene 2,3-dihydroxy-
3-naphthoic acid β-aminoethylamide, 2-hydroxy 3-naphthoic acid ethanolamide, 2-hydroxy-
3-naphthoic acid β-aminoethylamide, 2-hydroxy-3-naphthoic acid ethanolamide, 2-hydroxy-
Suitable examples include 3-naphthoic acid morpholinoethylamide, 2-hydroxy-3-naphthoic acid morpholinopropylamide, 1-biguanidino J■■noramide, ethylenediamine-N-N-bisacetoacetamide, and diresolmine.

To develop a diazo copying material using the developer of the present invention, in the case of a wet method, a method of applying or impregnating the exposed copying material with a sponge roller or group roller is applied, and a semi-dry method is used to develop a diazo copying material using the developer of the present invention. In this case, a developer sufficient to slightly wet only the surface of the photosensitive paper may be applied to the diazo photosensitive paper by the roller transfer method used in conventional offset printing.

The amount of developer attached depends on the concentration of the alkaline agent, but is generally about 1 to 10 y/M2. The effects of the present invention will be clarified by examples below.

A photosensitive solution having the following components was prepared, and this was applied to a 907/wl base paper for white photosensitive paper and dried to prepare a two-component type diazo photosensitive paper.

Diethylene glycol 3 Oml Isopropyl alcohol 3 Oml Tartaric acid 20y Thiourea 30V 2-Hydroxy-3-naphthoic acid ethanolamide 151 Caffeine 10y 4-Diazo-2-5-dibutoxymorpholinobenzene chloride Zinc chloride double salt 1Oy Saponin ly Water Total amount 11 After overlaying an appropriate original on the photosensitive paper and exposing it to light using a fluorescent lamp, the following Haruka 1 to yl. A developer having composition No. 6 was applied to the surface of the photosensitive paper using a sponge roller and developed.

This example is an example for investigating the effect of a wet method, and the following measurements were performed.

(1) Color density After copying, the image density 10 minutes later was measured using a photoport densitometer.

(2) Copy odor It was measured by the smell after copying.

(3) Condition during long-term use After being left for one month, the state of crystal formation on a portion of the roller and developer pan was visually determined.

Example 2 A pleco solution containing the following ingredients was prepared, and this was heated to 80y/m''
It was applied onto white photosensitive paper base paper and dried.

Silica (particle size l~5μ) 40 y Polyvinyl acetate emulsion (solid content 50%) 10 0 1 Methylene blue 0.5 y Water Total amount: 11 Furthermore, a photosensitive solution consisting of the following components was applied on top of it and dried. A two-component type diazo-sensitive paper was prepared.

The obtained two-component type diazo photosensitive paper was stacked with a suitable original and exposed to a fluorescent lamp, and then a small amount of a developer having the composition of Black 7 to Wash 12 below was applied to the surface of the photosensitive paper using a rubber roller and developed. did. This example examines the effect of semi-dry method.
The following measurements were carried out in the same manner as in Example 1.

Claims (1)

[Claims] 1. A diazo copying developer characterized by containing one or more alkali metal salts or alkaline earth metal salts of aliphatic aminosulfonic acids.