Stabilizers for photothermography with nitrile blocking groups

Details Stabilizers for photothermography with nitrile blocking groups Stabilizers for photothermography with nitrile blocking groups

G - Physics

03

C

G03C 1/498 (2006.01)

Patent

CA 2119601

STABILIZERS FOR PHOTOTHERMOGRAPHY WITH NITRILE BLOCKING GROUPS ABSTRACT OF DISCLOSURE Photothermographic compositions comprising a photographic silver halide, an organic silver salt, and a reducing agent for the organic silver salt, display improved stability in the presence of a compound having a nucleus of the formula: Image wherein: A represents any monovalent group for which the corresponding compound AH functions as a post-processing stabilizer, R1, R2, and R3, are independently hydrogen or methyl and with the proviso that R1 can represent an aryl group when R2 and R3 are hydrogen; R4 is hydrogen or lower alkyl of from 1 to 4 carbon atoms; R5 and R6 independently represent hydrogen, an alkyl group, a cyclo- alkyl group, an aryl group or R5 and R6 taken together with the carbon atom to which they are joined form a ring of 4 to 12 atoms; R7 and R8 are independently hydrogen or lower alkyl of 1 to 4 carbon atoms; and n is 0 or 1.

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