Manufacture of gamma-iron (III) oxide

Details Manufacture of gamma-iron (III) oxide Manufacture of gamma-iron (III) oxide

1975-09-25

1977-04-19

Vertiz, Oscar R.

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

C01G 4902

Patent

active

040188825

ABSTRACT:
A process for the manufacture of acicular magnetic gamma-iron(III) oxide by reducing acicular alpha-iron(III) oxide to magnetite and then oxidizing it to gamma-iron(III) oxide, wherein the alpha-iron(III) oxide is treated with a water-soluble alkaline earth metal compound and an alkylphenol with one to three alkyl radicals, each of 4 to 24 carbon atoms, on the benzene nucleus. Gamma-iron(III) oxides manufactured in this way show better magnetic orientability in the binder-containing dispersion, and a higher coercive force than prior art magnetic pigments.

REFERENCES:
patent: 2558303 (1951-06-01), Marcot et al.
patent: 2558304 (1951-06-01), Marcot et al.
patent: 3399142 (1968-08-01), Conley
patent: 3498748 (1970-03-01), Greiner
patent: 3700595 (1972-10-01), Kaiser
Def. Pub. of Oct. 21, 1969, No. 819,977; 867O.G.749.

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