Patent ID: 7052828

Claim:
A photothermographic material comprising at least a photosensitive silver halide, a non-photosensitive silver-supplying compound, a reducing agent and a binder on at least one surface of a support, wherein the photothermographic material further comprises at least one kind of halogen releasing compound having a water-solubilizing group represented by the following formula (A) and at least one kind of halogen releasing compound having no water-solubilizing group, and a gradation in a photographic characteristic curve of the photothermographic material is 2.5 to 4.0: R 1 —SO 2 —C(R 2 )R 3 —(CO) m —(L) n —SG Formula (A) wherein, in formula (A), R 1 is an aliphatic group or a cyclic group: R 2 and R 3 are each independently a hydrogen atom or a bromine atom, provided that at least one of them is a bromine atom: L is a divalent aliphatic linking group; m and n are each independently 0 or 1; and SG is a solubilizing group with a pKa value of 8 or less.