C - Chemistry – Metallurgy – 09 – K
Patent
C - Chemistry, Metallurgy
09
K
C09K 15/00 (2006.01) G03C 1/06 (2006.01)
Patent
CA 2065573
IM-0536 TITLE STABILIZED, AQUEOUS HYDRAZIDE SOLUTIONS FOR PHOTOGRAPHIC ELEMENTS ABSTRACT A process for stabilizing aqueous solutions of aryl hydrazides is described. These solutions may be made by the addition of a stabilizing amount of ascorbic acid, isoascorbic acid, erythorbic acid, tartaric acid, citric acid, glucose and a cyclodextrin, etc., or mixtures, for example. When aqueous solutions of aryl hydrazides containing these stabilizers/antioxidants are prepares, the solution will have a shelf life of up to 30 days compared to 1-3 hours of solutions without the stabilizer/antioxidant. The stabilized aryl hydrazide is useful in photographic silver halide emulsions, etc.
E.i. Du Pont de Nemours And Company
Fodor Ludovic
Sim & Mcburney
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