Emulsion for a photothermographic material, a production process for the thermographic material and a recording process therefor

A photothermographic recording material, capable of image formation without preliminary heating prior to exposure, comprising:

• a photo-addressable thermally developable element comprising a substantially light-insensitive organic silver salt, an organic reducing agent in thermal working relationship therewith, a photosensitive silver halide in catalytic association with said substantially light-insensitive organic silver salt, a binder, and a polyhalide compound selected from the group consisting of tetramethylammonium chloride perbromide, trimethylphenylammonium bromide perbromide and tetramethylammonium bromide perbromide.

A photothermographic recording process comprising:

• (a) image-wise exposing a photothermographic recording material to a source of actinic radiation, the photothermographic recording material comprising a photo-addressable thermally developable element comprising a substantially light-insensitive organic silver salt, an organic reducing agent in thermal working relationship therewith, a photosensitive silver halide in catalytic association with said substantially light-insensitive organic silver salt, a binder, and a polyhalide compound selected from the group consisting of tetramethylammonium chloride perbromide, trimethylphenylammonium bromide perbromide and tetramethylammonium bromide perbromide;
• and
• (b) thermally developing the image-wise exposed photothermographic recording material.