Use of 2,6-dihalo-4-substituted sulfonamidophenol reducing agents in thermographic and photothermographic compositions

Abstract From the Canadian patent

In a photothermographic element composition or process, for producing developed images employing processing with heat a combination comprising (a) photographic silver halide in association with (b) an oxidation-reduction image forming combination comprising (1) a silver salt oxidizing agent and (11) a reducing agent which is a 2,6-dichloro or 2,6-dibromo- 4-sulfonamidophenol such as the corresponding benzenesulfonamidophenol, and (c) a four equivalent color-forming coupler and (d) a polymeric binder, provides an image in color. After imagewise exposure of the photothermographic element or composition, a color image can be developed by heating the photothermographic element or composition …