Patent ID: 7557149
Filing Date: 2009-07-07
Classification: B01J,B22F,B82Y,C09D

Abstract:
1. A colloidal metal solution consisting essentially of colloidal metal particles with a sulfur compound of low molecular weight on the particle surfaces as a protective colloid, wherein the sulfur compound is at least one selected from the group consisting of mercaptoacetic acid, mercaptopropionic acid, thiodipropionic acid, mercaptosuccinic acid, mercaptoethanol, thiodiethylene glycol, thiodiglycolic acid, aminoethyl mercaptan, thiodiethylamine, thiourea, thioformamide and the salts thereof, the content of the sulfur compound being 0.05-1.5 parts by weight on the basis of one part by weight of the colloidal metal particles; a water solvent and at least one non-aqueous solvent selected from the group consisting of N-methylformamide, formamide, and N-methylacetamide, the content of the non-aqueous solvent being 15-50 parts by weight on the basis of 100 parts by weight of the water solvent; and wherein the solution contains not less than 1 wt. % of the colloidal metal particles and has a pH of 8-14.