Magnetic recording medium

Details Magnetic recording medium Magnetic recording medium

1992-12-21

1996-04-23

Kiliman, Leszek

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Including a second component containing structurally defined...

428328, 428329, 428331, 4284231, 428447, 4284735, 4284744, 428480, 428500, 428515, 428522, 428532, 428694B, 428694BP, 428694BN, 428684BA, 428694BM, 428694BG, 428694BR, 428694BC, 428694BU, 428900, B32B 516, G11B 566

Patent

active

055101771

ABSTRACT:
A magnetic recording medium having two or more magnetic layers is disclosed, comprising a first magnetic layer and a second magnetic layer which-have been provided in this order on a surface of a nonmagnetic support, and which contain ferromagnetic particles and a binder, wherein said second magnetic layer (outermost layer) contains nonmagnetic particles having a pH of less than 7, and a Mohs' hardness of 6 or more, in an amount of from 1 to 20 parts by weight, per 100 parts by weight of the ferromagnetic particles in the second magnetic layer, and said first magnetic layer contains nonmagnetic particles having a pH of 7 or more, and a Mohs' hardness of 6 or more, in an amount of from 5 to 50 parts by weight, per 100 parts by weight of the ferromagnetic particles in the first magnetic layer.

REFERENCES:
patent: 5001006 (1991-03-01), Saito et al.
patent: 5080967 (1992-01-01), Noguchi
patent: 5326618 (1994-07-01), Ryoke
Corresponds to U.S. Pat. No. 5,080,967.

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