Method for processing a photothermographic element

Details Method for processing a photothermographic element Method for processing a photothermographic element

1992-11-30

1994-01-18

Bowers, Jr., Charles L.

Radiation imagery chemistry: process, composition, or product th

Thermographic process

Heat applied after imaging

430352, 430353, 430619, G03C 1498

Patent

active

052799280

ABSTRACT:
A photothermographic element comprising a photosensitive silver halide, an organic silver salt and a reducing agent in concentrations such that imagewise exposure to actinic radiation generates from the silver halide a catalyst which accelerates an image-forming reaction between the organic silver salt and the reducing agent is processed by a method comprising the steps of (1) imagewise-exposing the element to actinic radiation to form a latent image therein, (2) subjecting the imagewise-exposed element to a first heating step at a temperature and for a time sufficient to intensify the latent image but insufficient to produce a visible image, and thereafter (3) subjecting the element to a second heating step at a temperature and for a time sufficient to produce a visible image. This method of "thermal latensification" serves to greatly reduce the significant speed losses that were heretofore encountered with photothermographic elements when considerable time was allowed to lapse between exposure to actinic radiation and generation of the visible image by heating.

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