Magnetic recording medium comprising upper and lower magnetic la

Details Magnetic recording medium comprising upper and lower magnetic la Magnetic recording medium comprising upper and lower magnetic la

1989-09-14

1992-01-28

Cashion, Jr., Merrell C.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Including a second component containing structurally defined...

428328, 428329, 428330, 428331, 428332, 428336, 4284233, 4284259, 4284246, 428694, G11B 2300

Patent

active

050843354

ABSTRACT:
A magnetic recording medium improved in the magnetic recording characteristics, running properties and durability is disclosed. The magnetic recording medium comprises a non-magnetic support having on a side of the support an upper magnetic layer positioned farther from the support and a lower magnetic layer positioned closer to the support. The upper magnetic layer comprises a binder, a magnetic powder having an original BET specific surface area of not less than than 30 m.sup.2 /g and at least one abrasive selected from alumina, silicon carbide, Cr.sub.2 O.sub.3, silica, .alpha.-Fe.sub.2 O.sub.3, TiO.sub.2 and zilconia in a portion of 3 to 20 parts per 100 parts by weight of the magnetic powder, and the lower magnetic layer comprises a binder and a magnetic powder having an original BET specific surface area of less than 30 m.sup.2 /g, and kinds of the binders each contained in the upper magnetic layer and the lower magnetic layer are the same.

REFERENCES:
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patent: 4670337 (1987-06-01), Tokuoka et al.
patent: 4847147 (1989-07-01), Aonuma
patent: 4946740 (1990-08-01), Ono et al.
Patent Abstracts of Japan, vol. 9, No. 30 (P-333); 2/8/85, JPA 59-172142; 9/28/84.

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