Process for the preparation of isometric magnetic iron oxide

Details Process for the preparation of isometric magnetic iron oxide Process for the preparation of isometric magnetic iron oxide

1988-11-07

1993-04-13

Cooper, Jack

Compositions

Magnetic

Iron-oxygen compound containing

423632, 423634, C01G 4902

Patent

active

052020436

ABSTRACT:
Isometric iron oxide pigments are prepared by an improved process by precipitation of aqueous solutions containing iron (II) salts with alkaline precipitating agents followed by oxidation of the precipitate at temperatures of from 20.degree. C. to 100.degree. C., wherein the improvement comprises adjusting the iron (III) content to 1 to 25 mol %, based on the total iron, before precipitation.

REFERENCES:
patent: 4052326 (1977-10-01), Schoenafinger et al.
patent: 4371567 (1983-02-01), Chamard et al.
patent: 4650597 (1987-03-01), Hibst et al.

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