Process for producing cobalt-containing magnetic iron oxide powd

Details Process for producing cobalt-containing magnetic iron oxide powd Process for producing cobalt-containing magnetic iron oxide powd

1982-12-14

1984-12-04

Cooper, Jack

Coating processes

Magnetic base or coating

Magnetic coating

252 6256, 427127, 427130, C01G 4902

Patent

active

044864671

ABSTRACT:
A phosphorus-containing magnetic iron oxide powder is subjected to the activation with an aqueous alkaline medium under pressure and then coated with a cobalt compound or a cobalt compound and other metallic compound(s) to produce a cobalt-containing magnetic iron oxide powder. The magnetic iron oxide powder obtained according to this process finds its best application to the production of magnetic recording media.

REFERENCES:
patent: 4064292 (1977-12-01), Schoenafinger et al.
patent: 4212903 (1980-07-01), Schnell et al.
patent: 4287233 (1981-09-01), Rudolf et al.
patent: 4379183 (1983-04-01), Araki et al.
patent: 4414245 (1983-11-01), Miyazawa et al.

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