Patent ID: 8231704
Filing Date: 2012-07-31
Classification: B22F,B82Y,Y10S,Y10T

Abstract:
1. A process for making a silver powder comprising silver particles, each said silver particle comprising silver components 100-2000 nm long, 20-100 nm wide and 20-100 nm thick assembled to form a spherically-shaped, open-structured particle substantially as shown in FIG. 1 , wherein the silver particles have a d 50 particle size of from about 2.5 μm to about 6 μm, said process comprising: (a) preparing an acidic aqueous silver salt solution comprising a water soluble silver salt dissolved in deionized water; (b) preparing an acidic reducing and surface morphology modifier solution comprising: (c) maintaining said acidic aqueous silver salt solution and said acidic reducing and surface morphology modifier solution at the same temperature, wherein said temperature is in the range of about 65° C. to about 90° C., while stirring each said solution; and (d) mixing said acidic aqueous silver salt solution and said acidic reducing and surface morphology modifier solution over a period of less than 10 seconds with no stirring to make a reaction mixture, maintaining said reaction mixture at said temperature of (c) and after 3 to 7 minutes stirring said reaction mixture for 2 to 5 minutes to produce said silver powder particles in a final aqueous solution.