Patent ID: 7094524

Claim:
A photothermographic film pack or stack comprising a plurality of photothermographic materials, each photothermographic material comprising a support having on a frontside thereof, one or more thermally-developable imaging layers comprising a binder and in reactive association, a photosensitive silver halide, a non-photosensitive source of reducible silver ions, and a reducing composition for said non-photosensitive source reducible silver ions, and on a non-photosensitive backside of said support, a backside layer comprising a binder and an amine organic base as a backside stabilizer, the conjugate acid of said organic base having a pKa greater than 5 and being present in an amount of at least 0.01 mmol/m 2 , wherein said backside stabilizer is represented by the following Structure I: wherein R 1 , R 2 , and R 3 are independently chosen from hydrogen, —C(R 4 )═NR 5 , —C(NR 6 R 7 )═NR 5 , substituted or unsubstituted alkyl groups having 1 to 18 carbon atoms, substituted or unsubstituted cycloalkyl groups, substituted or unsubstituted alkenyl groups having 2 to 18 carbon atoms, substituted or unsubstituted carbocyclic aryl groups having 6 or 10 carbon atoms in the aromatic rings, substituted or unsubstituted heterocyclic groups having 5 to 10 carbon, nitrogen, sulfur, and oxygen atoms, and R 4 , R 5 , R 6 , and R 7 are independently chosen from the same groups as R 1 , R 2 , and R 3 , or any one or more of R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , and R 7 as defined above may be joined with each other and/or the central nitrogen atom to complete one or more substituted or unsubstituted heterocyclic ring(s).