Compositions – Magnetic – Iron-oxygen compound containing
Patent
1983-06-27
1985-02-05
Cooper, Jack
Compositions
Magnetic
Iron-oxygen compound containing
423632, 423634, C01G 4906, C01G 4908
Patent
active
044977239
ABSTRACT:
A process for the preparation of acicular ferrimagnetic iron oxides by reducing gamma-iron(III) oxide hydroxide to magnetite, at from 280.degree. to 620.degree. C., by means of an organic compound which is decomposable at this temperature in the presence of iron oxide, and, optionally, a stream of reducing gas, and, if desired, then oxidizing the magnetite with oxygen-containing gases, at from 150.degree. to 450.degree. C., to acicular ferrimagnetic iron oxide of the formula FeO.sub.x, where x is from above 1.33 to 1.50, wherein the organic compound used for the reduction is a non-polar glycerol ester of a fatty acid which is introduced into the aqueous reaction suspension during the preparation of the gamma-iron(III) oxide hydroxide.
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Jakusch Helmut
Koester Eberhard
Melzer Milena
Ohlinger Manfred
Rudolf Peter
BASF - Aktiengesellschaft
Cooper Jack
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