Manufacture of acicular magnetic iron oxide

Details Manufacture of acicular magnetic iron oxide Manufacture of acicular magnetic iron oxide

1980-04-08

1981-03-31

Cooper, Jack

Coating processes

Magnetic base or coating

Magnetic coating

252 6256, 252 6262, 427127, 427128, C01G 4906, C01G 4908

Patent

active

042593689

ABSTRACT:
A process for the manufacture of acicular magnetic iron oxides which consist of a core of gamma-iron(III) oxide and a shell of a magnetite modified with zinc(II) ions and/or manganese(II) ions and which contain, based on the total modified gamma-iron(III) oxide, from 0.1 to 20 percent by weight of iron(II) ions, from 0.1 to 10 percent by weight of zinc(II) ions and/or from 0.1 to 10 percent by weight of manganese(II) ions.

REFERENCES:
patent: 3903004 (1975-09-01), Matsumoto et al.
patent: 4082905 (1978-04-01), Stephan
patent: 4122216 (1978-10-01), Okazoe
patent: 4188302 (1980-02-01), Becker et al.

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