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US 4,814,254 AGranted
Heat developable photographic element with conductive layer
AssigneeFuji Photo Film Co., Ltd.
InventorsHideki Naito, Hiroyuki Ozaki
Life of this patent
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Abstract
In a photographic element amenable to heat development or mobile dye heat transfer, an electroconductive layer is formed from a composition containing an electroconductive substance, typically carbon black and a high molecular weight compound having a glass transition temperature of not higher than 40.degree. C. at a relative humidity of 20% or a melting point of not higher than 180.degree. C., for example, polyethylene glycol, such that the conductive layer undergoes a minimized change in electric resistance when folded.
Claims8
A method for forming an image, comprising the steps of:
- imagewise exposing a photosensitive material comprising a photosensitive silver halide, a binder, and a dye-providing substance capable of forming or releasing a diffusible dye in direct or inverse proportion to reduction of the photosensitive silver halide to silver on a support, and
- heating the photosensitive material in the presence of water and a base and/or a base precursor during or after the imagewise exposure by conducting electricity to an electroconductive layer which is formed on the support of the photosensitive material or on a support of a dye-fixing material combined with the photosensitive material, said electroconductive layer containing at least an electroconductive substance and a polymeric compound having a glass transition temperature of up to 40.degree. C. at a relative humidity of 20% or a melting point of up to 180.degree. C., said electroconductive layer having a volume resistance of from 0.01 to 10 .OMEGA.-cm,
- thereby transferring the diffusible dye thus formed or released to a dye-fixing layer to form an image.
Dependencies are inferred from the claim text.