Magnetic recording medium

Details Magnetic recording medium Magnetic recording medium

1980-04-25

1981-11-24

Pianalto, Bernard D.

Stock material or miscellaneous articles

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

Particulate matter

252 6254, 428329, 428694, 428702, 428900, B32B 516

Patent

active

043025102

ABSTRACT:
A magnetic recording medium having more than 550 Oersted of a coercive force, less than 1.8 of a ratio of a coercive force at -196.degree. C. to a coercive force at 25.degree. C., less than 1.0 wt. % of a content of Fe.sup.2+ is prepared by incorporating a magnetic powder obtained by dispersing acicular .gamma.-Fe.sub.2 O.sub.3 in an aqueous solution of a cobalt salt and reducing it with a reducing agent to deposit a cobalt compound on the acicular .gamma.-Fe.sub.2 O.sub.3.

REFERENCES:
patent: 3958068 (1976-05-01), Umeki et al.
patent: 4069367 (1978-01-01), Umeki et al.
patent: 4112184 (1978-09-01), Umeki et al.

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