The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 25, 1995
Filed:
Nov. 19, 1993
Seiji Mori, Takehara, JP;
Kanetaro Sannohe, Takehara, JP;
Mitsui Kinzoku Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
This invention is to offer a copper powder for solderable and conductive paints which have an improved solderability, excellent adhesion and conductivity. A copper powder for solderable and conductive paints comprising particles of green caterpillar shape is obtained by crushing particulate dendritic copper powder, and has an oil absorption value (JIS K5101) of up to 20 ml/100 g, a maximum particle diameter of up to 44 .mu.m, an average particle diameter of up to 10 .mu.m, and a hydrogen-reduction loss of up to 0.5%. A process for producing this copper powder for solderable and conductive paints comprises: preparing a copper powder comprising particles of a green caterpillar shape having an average particle diameter of up to 10 .mu.m by crushing dendritic copper powder having a maximum diameter of up to 44 .mu.m by means of a crushing apparatus; treating the copper powders thus obtained with a pickling solution consisting of inorganic acids or organic acids to dissolve and remove any oxidation film on the copper powder surface; washing the copper powder with water; spraying a quick drying organic solvent on the copper powders; and hot-air drying the copper powder, thereby obtaining a copper powder having an oil absorption value of up to 20 ml/100 g and a hydrogen-reduction loss of up to 0.5%.