Radiation imagery chemistry: process – composition – or product th – Thermographic process – Heat applied after imaging
Patent
1978-05-30
1980-01-29
Louie, Jr., Won H.
Radiation imagery chemistry: process, composition, or product th
Thermographic process
Heat applied after imaging
430598, 430596, 430617, G03C 524, G03C 102
Patent
active
041860098
ABSTRACT:
A covering power, heat developable photographic material comprising, in binder, and in reactive association (a) negative-working photosensitive silver halide, (b) an image-forming combination comprising (i) an organic silver salt oxidizing agent containing a heterocyclic thione ligand or 1,2,4-mercaptotriazole ligand with (ii) an organic reducing agent and (c) a nucleating concentration of a hydrazino thiourea nucleating agent, enables a positive image to be developed and, in most cases, stabilized even though the photothermographic material contains no separate post-processing image stabilizer. The heat developable silver halide photographic material also enables development efficiency that is better than in those photothermographic silver halide materials not based on covering power imaging. A positive image can be developed in the heat developable photographic material after imagewise exposure by merely heating the material to moderately elevated temperatures. Other addenda employed in heat developable materials can be useful in the described heat developable photographic materials.
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Eastman Kodak Company
Knapp Richard E.
Louie, Jr. Won H.
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