Manufacture of gamma-iron(III) oxide

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

1976-04-19

1978-01-31

Vertiz, O. R.

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

252 6256, C01G 4902

Patent

active

040716104

ABSTRACT:
A process for the manufacture of acicular gamma-iron(III) oxide, in which the non-magnetic, acicular iron(III) oxide is treated with a solution of a compound of the formula I ##STR1## where R.sup.1 and R.sup.2 are ##STR2## or O--R.sup.5, R.sup.3 is H, OH, ##STR3## or O--R.sup.5, R.sup.4 is alkyl or cycloalkyl of 1 to 16 carbon atoms and the R.sup.4 's may be identical or different, and R.sup.5 is alkyl, cycloalkyl or aralkyl of 3 to 18 carbon atoms, and is then converted to gamma-iron(III) oxide by reduction to magnetite, followed by oxidation.
The gamma-iron(III) oxide obtained is distinguished by a high coercive force and improved magnetic orientation when used as a magnetic pigment for the manufacture of magnetic recording media.

REFERENCES:
patent: 3015627 (1962-01-01), Ayers et al.
patent: 3382174 (1968-05-01), Hund
patent: 3652334 (1972-03-01), Abeck et al.
patent: 3894970 (1975-07-01), Adams et al.
patent: 3897354 (1975-07-01), Woditsch et al.
patent: 3931025 (1976-01-01), Woditsch et al.
patent: 3947502 (1976-03-01), Leitner et al.
patent: 3974079 (1976-08-01), Woditsch et al.

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