Patent ID: 8366799
Filing Date: 2013-02-05
Classification: B22F,C22C,H01B,Y10T

Abstract:
1. A process for making a silver powder comprising spherically-shaped silver particles, 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 the acidic aqueous silver salt solution and the acidic reducing and surface morphology modifier solution at the same temperature, wherein that temperature is in the range of about 20° C. to about 65° C., while stirring each solution; and d. mixing the acidic aqueous silver salt solution and the acidic reducing and surface morphology modifier solution over a period of less than 10 seconds with no stirring to make a reaction mixture, maintaining the reaction mixture at the temperature of (c) and after 3 to 7 minutes stifling the reaction mixture for 2 to 5 minutes to produce the silver powder particles in a final aqueous solution.