JPH04170538A - Developer for silver halide photosensitive material - Google Patents

Abstract

PURPOSE:To prevent generation of an inactive substance accompanying a developing process by including 2-mercaptobenzothiazole-5-carboxylic acid or alkali salt thereof in a developer. CONSTITUTION:In a developer, 2-mercaptobenzothiazole-5-carboxylic acid or alkali salt thereof is included. The 2-mercaptobenzothiazole-5-carboxylic acid to be used can be composed by a method described in the Journal of the American Chemical Society, Vol. 49, 1748, (1927). Accordingly, generation of an inactive substance in a developer is prevented, sticking to an automatic developing apparatus is not caused so that contamination of a photosensitive material is prevented, a product value can be maintained, and cleaning of the automatic developing apparatus and the like can be omitted.

Description

Detailed Description of the Invention (a) Industrial Application Field The present invention relates to a developer for silver halide photographic materials;
The present invention relates to improving the performance of a developing solution, and more specifically, it relates to a developing solution that prevents the developing solution from becoming stained and prevents the equipment used in the development process from becoming stained.

(b) Conventional technology Processing of silver halide photographic materials is basically development, fixing, washing, and drying. A treatment step is added to increase physical strength.

In recent years, photographic processing has become faster and at the same time processing using automatic processors has become commonplace, and in order to support rapid processing, the developing solutions used have concentrated chemicals and high alkali concentrations, and processing at high temperatures has become more common. It will be done.

High alkali concentrations and high processing temperatures are very harsh conditions for developers, but there is a need for a developer that can be used stably even under such harsh conditions, and improvements have been made to the developer. ing.

To accommodate rapid processing, developers have become more powerful, and high alkalinity and large amounts of developing agents are used to serve this purpose. In high alkalinity environments, this developing agent is severely oxidized by air.

Developing ability decreases significantly. A preservative is used to prevent this oxidation, and a large amount of preservative is used for a large amount of developing agent.

The most common preservatives used in developer solutions are alkali metal salts of sulfite. However, this alkali metal salt of sulfite is also known as a dissolving agent for silver halide.

(c) Problems to be solved When developing with a developer containing a large amount of silver halide dissolving agent as described above, in addition to the development action, a silver halide dissolving action occurs simultaneously, and the dissolved silver halide is is dissolved in the developer, but as the dissolution progresses, it changes into an inert substance and accumulates in the developer.

On the other hand, in the processing method, development is carried out using an automatic processor to quickly process a large amount of processing, but as the processing amount of silver halide photosensitive materials increases, the amount of inert substances increases in the developer. Accumulation in the automatic developing machine and especially adhesion to the conveyance section causes contamination of the processed photosensitive materials, reducing the commercial value of the finished photographs. To eliminate sources of contamination, automatic processors must be cleaned often, and cleaning at the end of each day's processing is a time-consuming task, so a developer that does not generate inert substances is desired. ing.

(d) Means for Solving the Problems Accordingly, the object of the present invention is to relate to a developing solution that prevents the generation of inert substances generated during development processing. Yet another object relates to a developer that prevents contamination of photosensitive materials by inert substances in the developer; still another object relates to a developer that prevents contamination of automatic processors; This relates to a developer that reduces the effort required to clean the machine.

The present inventors have made various assumptions about a developer that can prevent inert substances generated in the developer and further prevent contamination of automatic processors, and have found that 2-mercaptobenzothiazole-5-carboxylic acid or It has been found that the objective can be achieved by including one portion of the alkali salt in the developer.

2-mercaptobenzothiazole-5 used in the present invention
-The synthesis method of carboxylic acid is described in the Journal of
e American Chemical 5ocie
ty, Vol. 49.1748, (1927).

(E) Examples The present invention will be explained in detail with reference to Examples, but the embodiments of the present invention are not limited thereby.

[Example 1] Commercially available photographic paper for computer typesetting was processed using a small automatic processor. The developer and processing conditions used are as follows.

Developer (1) Anhydrous sodium sulfite 50.0 g
-Phenyl-3-pyrazolidone 0.5 g Hydroquinone 20.0 g Benzotriazole 0.1 g Potassium bromide 2.0 g Disodium ethylenediaminetetraacetate 1.0 g Anhydrous potassium carbonate so, o g Add water
1.0 fl processing conditions: development time 20 seconds, development temperature 34°C, as a result of processing the above-mentioned photographic paper for computer typesetting at 5M per 1Ω of developer (1), inert substances were generated in the developer, and 5 bottles were Contamination was observed on the photosensitive material after processing, and in addition to contamination of the automatic processor, inert substances were observed on the conveyance section. Next, this automatic developing machine was thoroughly cleaned, 0.1 g of 2-mercaptobenzothiazole-5-carboxylic acid of the present invention was added per IQ to the developer (1), and the photosensitive material was subjected to 5-step processing. There was no generation of inert substances in the developing solution, no contamination of the processed photosensitive materials, and at the same time, no contamination of the automatic developing machine and no inert substances adhering to the conveyance section.

Example 2 A commercially available microfilm was processed using a small automatic processor. The developer and processing conditions used are as follows.

Developer (2) Anhydrous sodium sulfite 80.0 g
-Phenyl-3-pyrazolidone 2.0g Hydroquinone 40.0g Potassium bromide 5.0g Disodium ethylenediaminetetraacetate 2.0g Anhydrous potassium carbonate 25.0g Add water
1.0Q roasting case: Development time 60
2 seconds, development temperature 30°C, developer (2), 5n of the above microfilm (35m) per IQ (as a result of processing, inert substances were generated in the developer, and after being left in this state overnight, there was no inert material in the conveying section). The film processed the next day was contaminated due to the presence of active substances.The automatic processor was then thoroughly cleaned and the developer (2) was added with 2-mercaptobenzothiazole-5 of the present invention. - When 0.2 g of carboxylic acid was added per IQ and the photosensitive material was processed at 15 rrr, no inert substances were generated in the developer and there was no contamination of the automatic processor.

Example 3 A commercially available bright room type silver halide photosensitive material was processed using a small automatic processor. The developer and processing conditions used are as follows.

Developer (3) Anhydrous sodium sulfite 60.0 g
-Phenyl-3-pyrazolidone 0.5 g Hydroquidone 25.0 g Sodium bromide 360 g Disodium ethylenediaminetetraacetate 3.0 g Benzotriazole 0.5 g Anhydrous potassium carbonate 30.0 g Add water
pH with 1.OQ potassium hydroxide
is 10.9.

Processing conditions: Developing time 20 seconds, developing temperature 38°C, developer (3) As a result of processing the film for bright room processing once per IQ, a large amount of inert substances were generated in the developer, and it was difficult to use an automatic processor. There is inert material adhering to the transport section and processing tank wall.
Staining occurred on the processed film. Next, this automatic developing machine was thoroughly cleaned, and the 2-mercaptobenzothiazole-5-carboxylic acid of the present invention was added to the developer (3) at 0.0% per IQ.
As a result of adding 4 g of the above-mentioned film for bright room processing for 3 m, no inert substances were generated in the developing solution and no contamination of the automatic developing machine occurred.

The 2-mercaptobenzothiazole-5-carboxylic acid of the present invention is 0.01 to 2.0% per developer IQ. It is better to add Og for treatment.

(f) Effects of the Invention As described above, according to the present invention, it is possible to prevent the generation of insoluble substances in the developing solution, and since they do not adhere to the automatic developing machine, the product value can be maintained without contaminating the photosensitive material, and the product value can be maintained in the automatic developing machine. This has great practical effects, such as eliminating the need for cleaning.

Claims (1)

[Claims] 1. A developer for a silver halide photographic material, which is characterized in that the developer for processing the photographic material contains 2-mercaptobenzothiazole-5-carboxylic acid or an alkali salt thereof.