Patent ID: 7241561

Claim:
A photothermographic material comprising a support and having on at least one side thereof a photothermographic layer and comprising, in reactive association: a. a photosensitive silver halide b. a non-photosensitive source of reducible silver ions, c. a polymeric binder, and d. one or more ortho-substituted bis-phenol reducing agents for the reducible silver ions, each of said reducing agents having a bicyclic or tricyclic substituent ortho to one or both hydroxyl groups on the aromatic rings, wherein said one or more of said reducing agents are represented by the following Structure (I) wherein R 1 and R 1 ′ each represent the same or different isobornyl, norbornyl, benzonorbornyl, adamantyl, bicyclo[3.2.1]octyl, benzobicyclo[3.2.1]octyl, benzo[3,4]bicyclo[3.2.1]oct-3-enyl, bicyclo[2.2.2]octyl, bicyclo[3.2.2]nonyl, benzobicyclo[2.2.2]octyl, bicyclo[3.3.1]nonyl, bicyclo[3.3.2]decyl, bicyclo[4.3.1]decyl, bicyclo[4.4.1]undecyl, bicyclo[5.4.1]dodecyl, tricyclo [5.3.1.0(1.5)]undecyl, tricyclo[5.2.1.0(2,6)]decyl, tricyclo[5.4.0.0(2,9)]undecyl groups, R 2 and R 2 ′ independently represent a hydrogen atom or a group that can be a substituent on a benzene ring, Z represents —S— or a —CHR 3 — group wherein R 3 represents hydrogen, a substituted or unsubstituted linear, branched, or cyclic, bicyclic, or tricyclic alkyl, cycloalkyl, alkenyl, aralkyl, heterocyclic, aryl, or heteroaryl group, and X 1 and X 1 ′ independently represent a hydrogen atom or a group that can be a substituent on a benzene ring.