Patent ID: 7241561
Filing Date: 2007-07-10
Classification: C09B,G03C

Abstract:
1. 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 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.