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:
Mar. 06, 2007
Filed:
Oct. 19, 2004
Toshihiro Kato, Ehime, JP;
Shuji Okada, Ehime, JP;
Shoji Futaki, Ehime, JP;
Sunitomo Metal Mining Co., Ltd., Tokyo, JP;
Abstract
There is provided a nickel powder suitable as conductive particles for use in conductive paste and conductive resin, that is inexpensive, has superior weather resistance, low resistivity when kneaded with resin, and is stable when used in the long-term, and a production method therefor. A nickel powder is produced by a two stage reduction and precipitation process from an aqueous solution containing a bivalent nickel salt, wherein an average primary particle diameter is 0.2 μm to 2.0 μm as measured with a scanning electron microscope (SEM), wherein an average secondary particle diameter is 8 μm to 50 μm according to laser particle size distribution measurement, wherein a tap density is 0.5 g/ml to 2.0 g/ml, wherein a cobalt content is 1 to 20 weight %. The cobalt may be contained in only the surface layer of the nickel powder at a content of 1 weight % to 40 weight %.