Pyridinium aryl hydrazide compounds

Details Pyridinium aryl hydrazide compounds Pyridinium aryl hydrazide compounds

1989-12-15

1991-05-07

Waddell, Frederick E.

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

546347, C07D21320

Patent

active

050138448

ABSTRACT:
Photographic silver halide elements containing aryl hydrazides as defined for the production of images with ultrahigh contrast and a new class of aryl hydrazides with a cationic group in the aryl radical as defined. The photographic silver halide elements can be developed at relatively low pH values and have low fog and low tendency to form black spots in unexposed or slightly exposed areas.

REFERENCES:
patent: 2563785 (1951-08-01), Ives
patent: 3386831 (1968-06-01), Honig et al.
patent: 4224401 (1980-09-01), Takada et al.
Chemical Abstracts, vol. 99, No. 19, Abstract 158195w, p. 596, Nov. 7, 1983 [Katritzky et al.].
Anonymous Research Disclosure, 23510, Nov. 1983.

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