Patent ID: 7132229

Claim:
A photothermographic material comprising, on at least one side of a support, an image forming layer comprising at least a photosensitive silver halide, a non-photosensitive organic silver salt, a reducing agent, and a binder, and a non-photosensitive layer, wherein 1) the binder is a hydrophilic binder; 2) the non-photosensitive layer comprises gelatin or a gelatin derivative; 3) the reducing agent is a compound represented by the following formula (R); and 4) the photothermographic material comprises at least one compound represented by the following formula (I) or (II): wherein in formula (R), R 11 and R 11′ each independently represent an alkyl group and at least one of R 11 and R 11′ is a secondary or tertiary alkyl group; R 12 and R 12′ each independently represent a hydrogen atom or a group capable of substituting for a hydrogen atom on a benzene ring; L represents an —S- group or a —CHR 13 - group, wherein R 13 represents a hydrogen atom or an alkyl group; and X 1 and X 1′ each independently represent a hydrogen atom or a group capable of substituting for a hydrogen atom on a benzene ring; wherein in formula (I), Q represents an atomic group necessary for forming a 5- or 6-membered imide ring; and wherein in formula (II), R 5 independently represents one selected from a hydrogen atom, an alkyl group, a cycloalkyl group, an alkoxy group, an alkylthio group, an arylthio group, a hydroxyl group, a halogen atom, or an N(R 8 R 9 ) group, wherein R 8 and R 9 independently represent one selected from a hydrogen atom, an alkyl group, an aryl group, a cycloalkyl group, an alkenyl group, or a heterocyclic group; r represents 0, 1, 2, 3, or 4; R 8 and R 9 may link together to form a substituted or unsubstituted 5 to 7-membered heterocycle; two R 5 's may link together to form an aromatic, heteroaromatic, alicyclic, or heterocyclic condensed ring; and X represents one selected from O, S, Se, or N(R 6 ), wherein R 6 represents one selected from a hydrogen atom, an alkyl group, an aryl group, a cycloalkyl group, an alkenyl group, or a heterocyclic group.