Patent ID: 7482113

Claim:
A photothermographic material comprising a support having on at least one side thereof, one or more photothermographic imaging layers comprising in reactive association: a. a photosensitive silver halide, b. a non-photosensitive source of reducible silver ions, c. a reducing agent composition for said reducible silver ions comprising a trisphenol reducing agent represented by the following Structure (I), d. a polymeric binder, and e. a substituted olefinic co-developer that is represented by the following Structure (IV): wherein L 1 and L 2 are independently sulfur or a mono-substituted or unsubstituted methylene group, R 1 and R 2 are independently primary or secondary substituted or unsubstituted alkyl groups having 1 to 12 carbon atoms, R 3 , R 4 , and R 5 are independently substituted or unsubstituted alkyl groups having 1 to 12 carbon atoms, substituted or unsubstituted alkoxy groups having 1 to 12 carbon atoms, or halo groups, and R 6 , R 7 , R 8 , R 9 , R 10 , and R 11 are independently hydrogen or any substituent that is substitutable on a benzene ring, wherein V and W are independently aromatic or electron withdrawing groups, provided that at least one of V and W is an electron withdrawing group, or V and W can represent the atoms necessary to form a ring containing an electron withdrawing group, R is an —O − A + or —S − A + group, and A + is a quaternary phosphonium cation.