Patent ID: 7138223

Claim:
A photothermographic material comprising, on one side of a support, an image forming layer containing at least a photosensitive silver halide, a non-photosensitive organic silver salt, a reducing agent and a binder, and, on the other side of the support, non-photosensitive back layers, wherein: a gelatin is coated on the side having the image forming layer; a total quantity of gelatin coated on a non-photosensitive back side having the non-photosensitive back layers is 0.5 times to 1.5 times a total quantity of gelatin coated on the side having the image forming layer; the non-photosensitive back layers comprise two layers, and a content ratio of polymer latex to gelatin is greater in a non-photosensitive back layer closer to the support than in a non-photosensitive back layer further from the support; at least one of the non-photosensitive back layers contains at least one polymer latex having a glass transition temperature of −10° C. to 120° C.; a total quantity of polymer latex coated on the non-photosensitive back side is 20 to 40% by mass in relation to the total quantity of gelatin coated on the non-photosensitive back side; wherein at least one dye that can be discolored by thermal development processing is contained in at least one of the non-photosensitive back layers or a prime coat or under coat layer provided between either of the non-photosensitive back layers and the support.