JPS6256960A - Developer for silver halide photographic sensitive material - Google Patents

Abstract

PURPOSE:To prevent the contamination of an automatic developing machine by adding a specified compound to a developer so as to prevent the formation of insoluble matter in the developer. CONSTITUTION:A compound represented by the formula (where R is H or alkyl) is added to a developer for processing a silver halide photographic sensitive material. When the sensitive material is processed with the developer in a small-sized automatic developing machine, the formation of isoluble matter in the developer can be prevented, so the contamination of the developing machine can be prevented and the film can be processed without staining.

Description

DETAILED DESCRIPTION OF THE INVENTION A) Industrial Application Field The present invention relates to a developer for silver halide photographic light-sensitive materials, and relates to improving the performance of the developer. , relates to a developer that prevents staining of equipment used in development processing.

Conventional technology Processing of silver halide photographic light-sensitive materials is basically development, fixing, washing, and drying. A processing step is added to increase the strength of the target.

In recent years, photographic processing has become faster and at the same time processing using automatic processors has become commonplace.To support rapid processing, the developing solutions used have strong chemical and alkaline concentrations, and processing is carried out at high temperatures. be exposed.

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.

A preservative is used to prevent this oxidation, which significantly reduces the developing ability, 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, silver halide dissolving action occurs simultaneously in addition to the developing action, and the dissolved silver halide is It dissolves in the developer, but as the dissolution progresses further, it changes into an insoluble substance and accumulates in the developer.

On the other hand, the processing method uses an automatic developing machine to quickly process a large amount of processing, but as the processing amount of silver halide photosensitive materials increases, the amount of insoluble substances in the developing solution increases and Accumulation in the developing machine, especially adhering to the conveyance section, causes contamination of processed photosensitive materials, reducing the commercial value of the finished photographs. In order to remove 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 insoluble substances is desired. There is.

Therefore, an object of the present invention is to provide a developer that prevents the generation of insoluble substances that occur during development processing. Still another object relates to a developer that prevents contamination of photosensitive materials by insoluble 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.

2) Means for Solving the Problems The present inventors have conducted various studies on a developing image solution that can prevent insoluble substances from being generated in the developer and also prevent contamination of automatic processors. It has been found that the object can be achieved by incorporating a compound represented by the following general formula into a developer.

General formula (R is a hydrogen atom or an alkyl group) Examples of the compound used in the present invention include tetramethylthiuram disulfide, tetraethylthiuram disulfide, tetrabutylthiuram disulfide, etc. The substances used are not limited to those listed above.

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

Example 1 A commercially available computer phototypesetting paper was processed using a small automatic processor. The developer and processing conditions used are as follows.

Developer (1) Anhydrous sodium sulfite 50.0g1-
Phenyl-3-pyrazolidone 0.5g Hydroquinone 20.0g Benzotriazole 0.1g Potassium Bromide
2.0g disodium ethylenediaminetetraacetate 1.0g anhydrous potassium carbonate
Add 50.0g water
1. (Ml processing conditions: Developing time 20 seconds, developing temperature 34°C Developer solution Contamination was observed on the photosensitive material, contamination of the automatic processor, and adhesion of insoluble substances to the transport section. Next, thoroughly clean the automatic processor and remove the developer (1).
0.2 g of tetraethylthiuram disulfide of the present invention was added per 11 to
There was no generation of insoluble substances in the developer, there was no contamination of the processed photosensitive material, and at the same time, there was no contamination of the automatic developing machine or adhesion of insoluble substances 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 80.0g1-
Phenyl-3-pyrazolidone 2.0g Hydroquinone 40.0g Potassium Bromide
5.0g ethylenediaminetetraacetic acid disodium 2.0g anhydrous potassium carbonate
Add 25.0g water
1.09゜Processing conditions: Developing time: 60 seconds, developing temperature: 30°C As a result of processing 5 m of the above microfilm (35 am) per 11 of developer (2), insoluble substances were generated in the developer, and in this state, When left overnight, insoluble substances adhered to the conveying section, and the film processed the next day was contaminated. Add 0.4g of tetraethylthiuram disulfide of the invention per sentence and add 1g of the above photosensitive material.
As a result of the 5rn'' processing, no insoluble substances were generated in the developing solution, and there was no contamination of the automatic developing machine.

Example 3 In the same manner as in Example 1, 0.2 g of teloramethylthiuram disulfide of the present invention per 11 was added to the developer (1) and a photosensitive material was processed. The results showed that no insoluble substances were generated in the developer. There wasn't. Similar results were obtained when 0.4 g of tetrabutylthiuram disulfide was added per IJI.

Example 4 In the same manner as in Example 2, 0.2 g of tetramethylthiuram disulfide of the present invention per 11 was added to the developer (2) and a photosensitive material was processed. As a result, no insoluble substances were generated in the developer. Similarly, the results obtained by adding 0.4 g of tetrabutylthiuram disulfide of the present invention per 11 samples were also similar.

f) Effects of the Invention According to the present invention as described above, 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 causing film contamination, and it is also possible to clean the automatic developing machine, etc. This has great practical effects, such as saving time.

Patent applicant: Chugai Photo Pharmaceutical Co., Ltd. Agent: Patent Attorney Mitsuo Takahashi Procedural amendment July 7th, 1985 (.

Special 8:1 Director General
鵞＝、-1・19 Displays 1985 Patent Application No. 197094 2 Name of the invention Developer for silver halide photographic light-sensitive materials 3 Relationship with the person making the amendment case Patent applicant address (residence) Chuo, Tokyo 4-5-15 Nihonbashi Honcho
Name Chugai Photo Yakuhin Co., Ltd. 4 Agent 〒160 廿 03-368-2
994 Address (Residence) 7-3-10 Nishi-Shinjuku, Shinjuku-ku, Tokyo
No. 21 Sankyo Building No. 702 +-”77’5 Date of amendment order Voluntary issue 7 Contents of amendment (1) Specification page 7 line 19 [tetramethylthiuram disulfide] rtetramethylthiuram disulfide J
I am corrected.

(2) "Tetramethylthiuram disulfide" on page 8, line 6 of the specification is replaced with "tetramethylthiuram disulfide"
I am corrected.

that's all

Claims (1)

[Scope of Claims] A developer for silver halide photographic materials, characterized by containing a compound represented by the following general formula. General formula▲There are mathematical formulas, chemical formulas, tables, etc.▼ (R is a hydrogen atom or an alkyl group)