Patent ID: 7008748

Claim:
A co-precipitate particle comprising first and second organic silver salts, said first organic silver salt comprising a silver salt of a nitrogen-containing heterocyclic compound containing an imino group, and said second organic silver salt being uniformly distributed throughout the volume of said particle and comprising a silver salt of a mercaptotriazole, wherein said second organic silver salt comprises a silver salt of a mercaptotriazole having the following Structure (I): wherein R 1 and R 2 independently represent hydrogen, an alkyl group, an alkenyl group, a cycloalkyl group, an aromatic or non-aromatic heterocyclyl group, an amino or amide group, an aryl group, or a Y 1 —(CH 2 ) k — group wherein Y 1 is an aryl group or an aromatic or non-aromatic heterocyclyl group, and k is 1–3, or R 1 and R 2 taken together can form a 5- to 7-membered aromatic or non-aromatic nitrogen-containing heterocyclic ring, or still again, R 1 or R 2 can represent a divalent linking group linking two mercaptotriazole groups, and R 2 may further represent carboxy or its salts, provided that R 1 and R 2 are not simultaneously hydrogen, and when R 1 is an unsubstituted phenyl group, R 2 is not hydrogen.