Photothermographic material and method for forming images

Radiation imagery chemistry: process – composition – or product th – Radiation sensitive product – Silver compound sensitizer containing

Reexamination Certificate

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C430S264000, C430S965000

Reexamination Certificate

active

09809178

ABSTRACT:
A photothermographic material comprising at least (a) a photosensitive silver halide, (b) a reducible silver salt, (c) a reducing compound represented by the following general formula (1), and (d) a binder:in-line-formulae description="In-line Formulae" end="lead"?Q1—NHNH—R1:   Formula (1)in-line-formulae description="In-line Formulae" end="tail"?wherein, in the general formula (1), Q1represents a 5- to 7-membered unsaturated ring bonding to NHNH—R1at a carbon atom, and R1represents a carbamoyl group, an acyl group, an alkoxycarbonyl group, an aryloxycarbonyl group, a sulfonyl group or a sulfamoyl group, provided that when R1is propylcarbamoyl group, Q1is not 2,3,5,6-tetrachloro-4-cyanophenyl group. According to the present invention, there is provided a novel photothermographic materials showing high sensitivity, high development speed and little fluctuation of performance due to heat development temperature variation.

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