Patent ID: 6713240
Filing Date: 2004-03-30
Classification: G03C,Y10S

Abstract:
A black-and-white aqueous-based photothermographic material that comprises a support having thereon one or more thermally-developable imaging layers comprising a hydrophilic binder and in reactive association, a preformed photosensitive silver halide, a non-photosensitive source of reducible silver ions that is an organic silver salt other than a silver carboxylate, and a reducing agent composition for said non-photosensitive source reducible silver ions, andin one or more of said thermally developable imaging layers, one or more mercaptotriazoles represented by the following Structure I as toner(s): wherein R1 and R2 independently represent hydrogen, a substituted or unsubstituted alkyl group of from 1 to 7 carbon atom, a substituted or unsubstituted alkenyl group having 2 to 5 carbon atoms in the chain, a substituted or unsubstituted cycloalkyl group having 5 to 7 carbon atoms forming the ring, a substituted or unsubstituted aromatic or non-aromatic heterocyclyl group having 5 to 6 carbon, nitrogen, oxygen, or sulfur atoms forming the aromatic or non-aromatic ring, an amino or amide group, a substituted or unsubstituted aryl group having 6 to 10 carbon atoms forming the aromatic ring, or a substituted or unsubstituted Y1â€”(CH2)kâ€” group wherein Y1 is a substituted or unsubstituted aryl group having 6 to 10 carbon atoms in the aromatic ring, or a substituted or unsubstituted aromatic or non-aromatic heterocyclyl group as defined above for R1, and k is 1-3,or R1 and R2 taken together can form a substituted or unsubstituted, saturated or unsaturated 5- to 7-membered aromatic or non-aromatic nitrogen-containing heterocyclic ring comprising carbon, nitrogen, oxygen, or sulfur atoms in the ring, or still again, R1 or R2 can represent a divalent linking group linking two mercaptotriazole groups, and R2 may further represent carboxy or its salts, and M is hydrogen or a monovalent cation, provided that:1) R1 and R2 are not simultaneously hydrogen, 2) when R1 is substituted or unsubstituted phenyl or benzyl, R2 is not substituted or unsubstituted phenyl or benzyl, 3) when R2 is hydrogen, R1 is not an allenyl, 2,2-diphenylethyl, &agr;-methylbenzyl, or a phenyl group having a cyano or a sulfonic acid substituent, 4) when R1 is an unsubstituted benzyl or phenyl group, R2 is not substituted 1,2-dihydroxyethyl, or 2-hydroxy-2-propyl, 5) when R1 is hydrogen, R2 is not 3-phenylthiopropyl, and 6) said one or more thermally developable imaging layers has a pH less than 7.