Patent ID: 8216340
Filing Date: 2012-07-10
Classification: B22F

Abstract:
1. A method for the manufacture of easily dispersed, stable to oxidation, crystalline, copper powders in the absence of polymeric dispersants comprising the sequential steps: a. forming a Cu(I) solution by dissolving a Cu(I) salt in deionized water, wherein the Cu(I) salt is selected from the group consisting of cuprous chloride, cuprous acetate and cuprous bromide; b. forming a Fe(II) salt solution by dissolving a Fe(II) salt in deionized water; c. forming a carboxylic acid solution by dissolving a carboxylic acid or a salt of a carboxylic acid in deionized water, d. forming a reducing Fe (II) carboxylic acid complex solution by adding the Fe (II) salt solution to the carboxylic acid solution e. rapidly adding the reducing Fe(II) carboxylic acid complex solution to the Cu(I) solution f. continuing to stir the solution until all of the copper has been precipitated and copper particles have been formed; g. allowing the copper particles to settle followed by removal of a supernatant, washing the copper particles, collecting them, and then drying them.