Patent ID: 8292986
Filing Date: 2012-10-23
Classification: B22F

Abstract:
1. A method for the formation of dispersed, uniform, smooth surface, spherical silver particles without the use of a protective colloid comprising the sequential steps of : (a) dissolving a silver salt in a solvent and mixing this solution with a polyamine to form a solution of a silver-polyethylene amine complex; (b) preparing a reducing solution comprising iso-ascorbic acid or ascorbic acid dissolved in a solvent; (c) adding the reducing solution to the silver-polyethylene amine complex solution to form finely divided, dispersed, uniform shaped spherical silver particles; (d) separating the silver particles from the solution of step (c); (e) washing the silver particles with a solvent; and (f) drying the finely divided, dispersed, uniform shaped spherical silver particles.