| abstract |
For achieving both advantages of high activity in heat development and superior image storability, the present invention provides a photothermographic material comprising a support having provided on one surface side thereof an image-forming layer comprising at least one kind of photosensitive silver halide, a photo-insensitive organic silver salt, a reducing agent for a silver ion and a binder having a glass transition temperature of 20° C. or higher, wherein the image-forming layer comprises a compound represented by Q 1 —NHNH—Q 2 , wherein Q 1 represents an aromatic group or a heterocyclic group bonding to—NHNH—Q 2 with a carbon atom, and Q 2 represents a carbamoyl group, an acyl group, an alkoxycarbonyl group, an aryloxycarbonyl group, a sulfonyl group or a sulfamoyl group, and a hydrogen bonding type compound, and a heat development process comprising plate heaters and pressing rollers between which the photothermographic material is carried through and developed to form an image superior in image storability without unevenness of photographic density. |