Manufacture of gamma-iron(III) oxide

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

1975-06-12

1977-11-22

Pianalto, Bernard D.

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

Particulate matter

427130, H01F 111, H01F 1002

Patent

active

040597164

ABSTRACT:
A process for the manufacture of acicular gamma-iron(III) oxide which, because of its improved dispersibility in organic binders, is suitable for the manufacture of magnetic recording media exhibiting a particularly high orientation ratio. For this purpose, the non-magnetic acicular .alpha.-iron(III) oxide or goethite pigment is treated with from 0.5 to 10% by weight, based on the pigment, of a compound of the formula I: ##STR1## where R.sup.1, R.sup.2 and R.sup.3 are hydrogen, alkyl of 1 to 24 carbon atoms or alkenyl of 1 to 24 carbon atoms and (RX).sup.- is selected from the group consisting of an aliphatic carboxylic acid of 1 to 18 carbon atoms, an aromatic carboxylic acid of 1 to 18 carbon atoms, a sulfonic acid and an ester of phosphoric acid and is then further processed by conventional methods to give gamma-iron(III) oxide.

REFERENCES:
patent: 3574683 (1971-04-01), Johnston
patent: 3652334 (1972-03-01), Abeck et al.
patent: 3794519 (1974-02-01), Akashi et al.
patent: 3892888 (1975-07-01), Halaby et al.

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