Method of preventing oxidation of copper powder

Abstract

A method of preventing oxidation of copper powder which comprises the steps of: mixing copper powder, boric acid, and a solvent to form a mixture; and drying the mixture to evaporate the solvent, the boric acid being used in such an amount that the amount of boron atoms present in the copper powder after the drying step is from 0.01 to 0.1% by weight based on the weight of the copper powder, the solvent being selected from the group consisting of ketone solvents, hydrocarbon solvents and aromatic solvents, and being used in such an amount that the boric acid concentration of the mixture is not higher than the saturated concentration of boric acid.

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