Acicular cobalt-modified iron oxides and their preparation

Details Acicular cobalt-modified iron oxides and their preparation Acicular cobalt-modified iron oxides and their preparation

1990-05-21

1993-02-02

Thibodeau, Paul J.

Stock material or miscellaneous articles

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

Particulate matter

428403, 252 6256, B32B 516

Patent

active

051837099

ABSTRACT:
Acicular, cobalt-modified iron oxides consisting of a core of an iron oxide of the formula FeO.sub.x where x is from 1.33 to 1.5 and a ferrite shell which contains a total amount of from 0.4 to 12% by weight of cobalt ions and not more than 5% by weight of iron(II) ions, the percentages being based on the total amount of the material, which iron oxides have improved aging resistance, particularly with regard to the coercive forces, and a process for their preparation.

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patent: 4686142 (1987-08-01), Kiemie et al.
patent: 4713261 (1987-12-01), Masaki et al.
patent: 4770903 (1988-09-01), Schwab et al.
J6 0196-905-A, Fuji Photo Film KK, Japanese Abstract.

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