Method of making flowable alkaline thiosulfate/alkaline sulfite

Details Method of making flowable alkaline thiosulfate/alkaline sulfite Method of making flowable alkaline thiosulfate/alkaline sulfite

1992-01-31

1993-12-14

Le, Hoa Van

Radiation imagery chemistry: process, composition, or product th

Nonradiation sensitive image processing compositions or...

Fixer

430455, 430459, G03C 538

Patent

active

052701549

ABSTRACT:
A method for making flowable alkaline thiosulfate, flowable alkaline sulfite, or a combination of the two, by blending an alkaline thiosulfate, an alkaline sulfite, or a combination of the two, with an alkali metal arylsulfonate.formaldehyde in an amount effective to render the alkaline thiosulfate, the alkaline sulfite, or the combination freely flowable, and the product of this method. It has been found that the product of this method, such as freely flowable ammonium thiosulfate powder mixture, can be stored in a freely flowable condition for extended periods of time and can be dissolved into solution readily to form a clear non-turbid solution. The freely flowable ammonium thiosulfate powdered mixture of the present invention is particularly useful as a photographic fixative and bleach fixative for processing photographic elements.

REFERENCES:
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patent: 2782121 (1957-02-01), Goldhammer
patent: 2871121 (1959-01-01), Kimura et al.
patent: 2893865 (1959-07-01), Welliver et al.
patent: 3169992 (1965-02-01), Henn
patent: 4923786 (1990-05-01), Kuhnert et al.
patent: 5135840 (1992-08-01), Reuter et al.
Ammonium sulfite, Hackh's Chemical Dictionary, p. 40, McGraw-Hill Book Company, 1969.
Ammonium sulfite, The Condensed Chemical Dictionary, p. 55, Van Nostrand Reinhold Company, 1971.

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