Cobalt-containing black pigment particulates

Details Cobalt-containing black pigment particulates Cobalt-containing black pigment particulates

2005-09-16

2008-10-21

Green, Anthony J (Department: 1793)

Compositions: coating or plastic

Materials or ingredients

Pigment, filler, or aggregate compositions, e.g., stone,...

C423S594190

Reexamination Certificate

active

07438754

ABSTRACT:
Disclosed is a black pigment having adequate degree of blackness and high electrical resistance at the same time. Specifically disclosed is a granular black pigment containing cobalt which is characterized in that it is composed of an oxide containing at least cobalt and the divalent cobalt content accounts for 40-70% of the total cobalt content. It is preferable that the total cobalt content in a whole particle is 60-80% by mass, and the divalent cobalt content in a whole particle is 20-50% by mass. It is also preferable that the primary particle diameter is 0.02-0.6 μm.

REFERENCES:
patent: 5968248 (1999-10-01), Shibasaki et al.
patent: 7014701 (2006-03-01), Stewart et al.
patent: 2007/0103075 (2007-05-01), Kim et al.
patent: 8-208238 (1996-08-01), None
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patent: 10-324523 (1998-12-01), None
patent: 2000-162643 (2000-06-01), None
patent: 2002-68750 (2002-03-01), None
patent: 2002-114521 (2002-04-01), None
patent: 2003-138160 (2003-05-01), None
Machine Translation of Japanese Patent Specification No. JP08-208238A (Aug. 1996).
Machine Translation of Japanese Patent Specification No. JP2002-68750A (Mar. 2002).
Machine Translation of Japanese Patent Specification No. JP2003-138160A (May 2003).

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