Acicular .alpha.-iron particles and recording media employing sa

Details Acicular .alpha.-iron particles and recording media employing sa Acicular .alpha.-iron particles and recording media employing sa

1979-11-16

1981-06-16

Pianalto, Bernard D.

Coating processes

Magnetic base or coating

Magnetic coating

75 05AA, 427128, B05D 512

Patent

active

042738075

ABSTRACT:
Particulate product containing at least 75 weight % iron (total iron content) and at least 25 weight % acicular .alpha.-iron metal, process for making said product and magnetic recording medium having said product incorporated therein, said product having a length less than 1 micron (.mu.), a length to diameter ratio of at least about 10:1, a coercivity (iH.sub.c), of greater than about 800 oersteds, a saturation magnetization (.sigma..sub.s) of at least 110 electromagnetic units/gram (emu/g), a residual (remanent) magnetization (.sigma..sub.r) of at least 50 emu/g, and a ratio (.sigma..sub.r /.sigma..sub.s) of residual (remanent) magnetization (.sigma..sub.r) to saturation magnetization of at least about 0.45.

REFERENCES:
patent: 2879154 (1959-03-01), Campbell
patent: 3607219 (1971-09-01), Giessen
patent: 3865627 (1975-02-01), Roden et al.
patent: 4017303 (1977-04-01), Koester et al.
patent: 4050962 (1977-09-01), Koester et al.

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