Compositions – Magnetic – Chromium or chromium compound containing
Patent
1993-03-11
1994-08-16
Straub, Gary P.
Compositions
Magnetic
Chromium or chromium compound containing
25218233, 423139, 423265, 556147, 556148, 556149, C09D 523
Patent
active
053384733
ABSTRACT:
Beta cobaltous hydroxide is synthesized by decomposing the complex formed between cobaltous ions and a suitable complexing agent under hydrothermal conditions. Cobaltous ion and complexing agent are combined in an aqueous medium, wherein the molar ratio of the cobaltous ion to the complexing agent is about one or more. Hydroxide ion is added, wherein the molar ratio of hydroxide ion to cobaltous ion is more than about 2. The resulting admixture is heated under hydrothermal conditions for precipitating beta cobaltous hydroxide. The method provides improved control over the size and shape of the beta cobaltous hydroxide reaction product. The beta cobaltous hydroxide can be reduced to form magnetic particles of cobalt metal.
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Griswold Gary L.
Kagan David B.
Kirn Walter N.
Minnesota Mining and Manufacturing Company
Nguyen N. M.
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