Magnetic recording medium

Details Magnetic recording medium Magnetic recording medium

1984-05-23

1985-02-19

Robinson, Ellis P.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Physical dimension specified

252 6254, 252 6256, 360134, 360135, 360136, 427128, 428694, 428900, G11B 570, B32B 516

Patent

active

045005990

ABSTRACT:
A magnetic recording medium comprising a nonmagnetic base having formed thereon a magnetic layer containing a fine particulate ferromagnetic material dispersed in a binder is disclosed. The ferromagnetic material is a mixture of two fine ferromagnetic powders (a) and (b) in a weight ratio of from 90/10 to 30/70. The powder (a) comprises .gamma.-Fe.sub.2 O.sub.3 particles having a coercivity (Hc) of 330 to 390 Oe and a saturation magnetization (.sigma.s) of 68 to 80 emu/g at a maximum magnetizing force (Hm) of 5 KOe, and a specific surface area of 18 to 25 m.sup.2 /g, and powder (b) comprises .gamma.-Fe.sub.2 O.sub.3 particles having a coercivity (Hc) of 400 to 450 Oe and a saturation magnetization (.sigma.s) of 65 to 78 emu/g at a maximum magnetizing force (Hm) of 5 KOe, and a specific surface area of 22 to 30 m.sup.2 /g. The tape has the ability to clearly and faithfully reproduce high fidelity sound.

REFERENCES:
patent: 3740266 (1973-06-01), Ahoshi et al.
patent: 4259392 (1981-03-01), Suzuki
patent: 4281043 (1981-07-01), Deffeyes
patent: 4364988 (1982-12-01), Andoh

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