Magnetic recording medium comprising multiple magnetic layers wi

Details Magnetic recording medium comprising multiple magnetic layers wi Magnetic recording medium comprising multiple magnetic layers wi

1992-06-24

1993-10-12

Resan, Stevan A.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Physical dimension specified

428402, 4284259, 428522, 428694BM, 428900, 428694BA, 428694BN, 428694BR, 428694BG, G11B 500

Patent

active

052523926

ABSTRACT:
A magnetic recording medium is disclosed. The medium comprises a support and provided thereon, a plurality of magnetic layers containing a magnetic powder and a binder, wherein an outermost magnetic layer of said magnetic layers comprises a ferromagnetic metal powder having an average major axis length of not more than 0.25 .mu.m and a crystallite size of not more than 200 .ANG. and carbon black having an average particle diameter of not less than 30 m.mu. in an amount of not more than 1% by weight, said outermost magnetic layer having a thickness of not more than 1 m.mu. and a surface roughness R.sub.10z of not more than 50 nm, and at least one magnetic layer other than said outermost layer comprises a cobalt-containing magnetic iron oxide powder having an average major axis length of not less than 0.25 .mu.m and a crystallite size of not less than 250 .ANG., said magnetic layer having a coercive force of from 500 to 1200 Oe.

REFERENCES:
patent: 4666754 (1987-05-01), Arioka et al.
patent: 4946740 (1990-08-01), Ono et al.
patent: 5026598 (1991-06-01), Koyama et al.

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