JPS6116974B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a developer suitable for semi-dry diazo development. Generally, a wet method, a dry method, or a thermal method is employed as a developing method for diazo photosensitive materials. In the wet method, a one-component photosensitive paper is coated with a photosensitive solution containing a diazo compound on a paper support, and after exposure, a large amount of an alkaline aqueous solution of coupler is applied to develop color, or a photosensitive solution containing a diazo compound and a coupler is coated. This is a method in which a large amount of an alkaline aqueous solution is applied to two-component photosensitive paper to develop color.In the dry method, a two-component photosensitive paper is coated with a photosensitive solution containing a diazo compound and a coupler on a paper support, and after exposure, ammonia gas is applied. In the thermal method, a two-component diazo-sensitive paper is coated with a photosensitive solution containing a diazo compound, a coupler, and an alkali generator on a paper support, and after exposure, alkali is generated by heating. This is a developing method that allows the color to develop. However, the wet method has disadvantages in that the copy is taken out in a wet state, that crystals are deposited in the developer due to water evaporation, and that the developer becomes colored over time, staining the background of the copy. In addition, the dry method uses ammonia as a developer, which causes a strong odor and poses problems in terms of environmental hygiene, and also has disadvantages in that the developing device is large and expensive. Furthermore, in the thermal method, since the photosensitive paper contains a reagent that generates alkali when heated, there is a drawback that the photosensitive paper has poor storage stability. In order to improve these shortcomings, in recent years a development method has been developed in which a small amount of a developer prepared by using an organic amine as an alkaline agent and dissolving it in a diluent such as ethylene glycol is applied to the exposed two-component diazo photosensitive paper. Proposed. Although this method can solve some of the drawbacks of the above-mentioned developing method, since the developer generally contains organic amines that are susceptible to air oxidation, the developed copy and the developer itself can be significantly discolored or colored, which is undesirable. cause a phenomenon. Furthermore, although not as bad as ammonia, organic amines also have a unique odor, which causes deterioration of the working environment. The present invention provides a diazo copying developer that can consistently produce high-quality copies and is free from coloration and odor by using a non-amine based alkali agent and water and polyhydric alcohol as diluents. It is something. That is, the developer of the present invention contains an alkali metal salt and/or alkaline earth metal salt of an amino acid and an alkali metal carbonate, borate, and/or phosphate as an alkaline agent, and a polyhydric alcohol and water as a diluent. It is characterized by including. By the way, the present inventors have previously proposed in Japanese Patent Application No. 82,018/1987 as an improvement to the conventional semi-dry type developer, using 20 to 50% by weight of an alkali metal salt and/or alkaline earth metal salt of an amino acid as an alkali agent. A developing solution consisting of 10 to 60% by weight of polyhydric alcohol as a diluent and the balance of water was proposed. However, this developer has insufficient color development due to the alkaline agent, making it difficult to obtain high-density images, and since a large amount of alkaline agent is used, the viscosity of the liquid becomes extremely high when the water evaporates. However, it is difficult to control the amount of developer applied to the photosensitive paper, the photosensitive paper tends to wrap around the developing roller, and the high alkali concentration causes yellowing of the background. Therefore, the present inventor used an alkali metal carbonate, borate, and/or phosphate in combination with this alkaline agent, and these problems were resolved, and crystallization of the mixed alkaline agent did not occur as originally expected. I discovered that. The alkali metal salts and/or alkaline earth metal salts of amino acids used as alkaline agents in the present invention dissociate in water and exhibit strong alkalinity. It is an odorless substance. In addition, these substances are highly hygroscopic, have high solubility in glycols and water, and therefore do not crystallize even when water evaporates. Examples of such alkali metal salts or alkaline earth metal salts of amino acids include L-α-alanine, DL-α
-alanine, β-alanine, L-alloisoleucine, L-α-aminobutyric acid, D-β-aminobutyric acid,
DL-β-aminobutyric acid, γ-aminobutyric acid, DL-α
-Aminobutyric acid, L-asparagine, D-asparagine, L-aspartic acid, DL-aspartic acid, L-asterbine, L-ganavanine, L
-Citrulline, creatine, creanitine, L
-cysteine, L-cystine, D-cystine, L
-Glutamic acid, D-glutamic acid, DL-
Glutamic acid, L-glutamine, glycine, L
-Histidine, L-α-hydroxyproline, L
-β-hydroxyproline, L-isoleucine,
DL-isoleucine, L-leucine, DL-leucine, L-lysine, L-methionine, DL-methionine, L-norleucine, D-norleucine, L
-Norvaline, D-Norvaline, DL-Norvaline, L-Octopine, DL-Ornithine, L-Ornithine, L-Phenylalanine, β-Phenylalanine, DL-Phenylalanine, D-Phenylalanine, L-Proline , sarcosine, L-serine, DL-serine, taurine, L-threonine, L-tryptophan, L-tyrosine, DL-
Tyrosine, L-α-valine, DL-valine, DL-
Salts of sodium, potassium, lithium, magnesium, calcium, barium, etc., such as α-valine and β-valine, may be used alone or in combination of two or more. The appropriate amount used is 5 to 30% by weight. Similarly, alkali metal borates, carbonates or phosphates used as alkaline agents include, for example, potassium metaborate, potassium tetraborate, sodium borate, lithium borate, sodium carbonate, potassium carbonate, lithium carbonate, Examples include potassium phosphate, sodium phosphate, and the like. The amount used is suitably in the range of 1 to 20% by weight. These may be used alone or in combination of two or more. Polyhydric alcohols used as diluents include ethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, polyethylene glycol, propylene glycol, dipropylene glycol, tripropylene glycol, polypropylene glycol, glycerin, trimethylene glycol, and tetraethylene glycol. Methylene glycol, butanediol, 1.5
- Pentanediol, hexylene glycol, octylene glycol, etc., which may be used alone or in combination of two or more. The appropriate amount used is 10 to 60% by weight. In addition to polyhydric alcohol, water is used as a diluent. Water has the effect of increasing the solubility of the alkaline agent and improving color development. In addition to the above-mentioned components, a surfactant can be added to the developer of the present invention. The developer of the present invention is preferably applied to a semi-dry method. In this case, the appropriate coating amount is about 5 g/m ³ or less. The coating means is preferably a rubber roller such as that used in offset printing. The applicable diazo-sensitive paper may be a commercially available two-component type paper. Examples and comparative examples are shown below. Examples 1-2 Commercially available two-component photosensitive paper (4 as a diazo compound)
- diazo-2,5-dipoxymorpholinobenzene chloride, zinc chloride double salt, and 2-hydroxy-3-naphthoic acid ethanolamide as a coupler) with a suitable original and exposed to a fluorescent lamp. A developing solution having the composition shown in the table below was applied to the surface using a rubber roller and developed to obtain a copy. The image density and the viscosity of the developer after water evaporation (20°C) are indicated. 【table】

Claims (1)

[Claims] 1 5 to 30% by weight of an alkali metal salt and/or alkaline earth metal salt of an amino acid as an alkali agent, 1 to 20% by weight of an alkali metal carbonate, borate and/or phosphate, and a polyhydric acid as a diluent. Diazo copying developer containing alcohol and water.