Patent ID: 7169544

Claim:
A black-and-white thermally developable material comprising a support and having thereon at least one thermally developable imaging layer comprising a polymer binder and said material further comprising, in reactive association: a. a non-photosensitive source of reducible silver ions, b. a reducing agent for said reducible silver ions, and c. at least 0.0001 mol/m 2 of a thermal solvent having the following Structure I, II, III, or IV: wherein R 1 , R 2 , R 3 , and R 4 are independently hydrogen or an alkyl, cycloalkyl, or alkenyl group, or R 1 and R 2 , or R 3 and R 4 can be joined together to form a 3- to 6-membered ring, or again either R 1 or R 2 can be joined with either R 3 or R 4 to form a 6- to 8-membered ring with the >NC(═O)C(═O)N<group, provided that at least one of R 1 , R 2 , R 3 , and R 4 is not a hydrogen atom, wherein R 5 is hydrogen or an alkyl or alkenyl group, R 6 and R 7 are independently hydrogen or an alkyl or alkenyl group, or R 6 and R 7 can be joined together to form a 3- to 6-membered ring, or again either R 6 or R 7 can be joined with R 5 to form a 6- to 12-membered ring with the >NC(═O)(L 1 )-group, and L 1 is an alkylene group of 2 to 8 carbon atoms that is substituted with 2 to 8 hydroxy groups, and wherein R 8 , R 9 , R 10 , and R 11 are independently hydrogen or an alkyl or alkenyl group, or R 8 and R 9 , or R 10 and R 11 can be joined together to form a 3- to 6-membered ring, L 2 is an alkylene group having 1 to 8 carbon atoms, provided that when L 2 has 1 or less hydroxy groups, at least one of R 8 , R 9 , R 10 , and R 11 is an alkyl that is substituted with at least one hydroxy group or alkenyl group, and wherein R 12 , R 13 , and R 14 are hydroxyalkyl groups having 1 to 8 carbon atoms.