C - Chemistry – Metallurgy – 09 – B
Patent
C - Chemistry, Metallurgy
09
B
96/100, 260/300,
C09B 23/00 (2006.01) G03C 1/12 (2006.01) G03C 1/485 (2006.01) G03C 8/08 (2006.01)
Patent
CA 1078848
Abstract of the Disclosure Heterocyclic N-(acylhydrazinophenyl)thioamide nucleat- ing agents are disclosed as well as radiation-sensitive composi- tions and elements containing such nucleating agents in combina- tion with silver halide grains capable of forming an internal latent image. The elements can be used to form direct-positive photographic images. Dye image transfer photographic elements are specifically contemplated. The N-(acylhydrazinophenyl- thioamide nucleating agents can be of the type having the formula Image wherein R1 is a phenylene group, A is =N-R2, -S- or -O-, Q1 is represented by the formulae Image or Image , L is a methine group, X is =S or =O, T is Image or Image , R3 is an alkyl substituent, R4 is an alkyl, Image or alkoxy group, -1- Z represents the nonmetallic atoms necessary to complete a basic heterocyclic nucleus of the type found in cyanine dyes having ring-forming atoms chosen from the class consisting of carbon, nitrogen, oxygen, sulfur and selenium, n and d are independently chosen from the integers 1 and 2, R2, R5, R6 and R7 are independently chosen from hydrogen, phenyl, alkyl, alkylphenyl and phenylalkyl, and said alkyl moieties in each instance include from 1 to 6 carbon atoms. -1a-
261420
Elwood James K.
Leone Ronald E.
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