Magnetic recording medium having a specified thickness relations

Details Magnetic recording medium having a specified thickness relations Magnetic recording medium having a specified thickness relations

1993-10-29

1995-09-05

Resan, Stevan A.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

428213, 428215, 428328, 428329, 428694BS, 428694BM, 428694BH, 428900, G11B 0500

Patent

active

054477824

ABSTRACT:
Disclosed is a magnetic recording medium, comprising (a) a nonmagnetic flexible support, (b) a lower nonmagnetic layer provided on the support and comprising a nonmagnetic particle and a binder, and (c) a magnetic layer provided on the nonmagnetic layer and comprising a ferromagnetic particle and a binder, wherein (i) the magnetic layer comprises at least two layers comprising a lower magnetic layer provided on the lower nonmagnetic layer and an upper magnetic layer provided on the lower magnetic layer, (ii) a ratio of the lower nonmagnetic layer thickness to the total magnetic layer thickness of the lower magnetic layer and the upper magnetic layer is from 1 to 50, (iii) the upper magnetic layer and the lower magnetic layer have a difference in coercive force of at least 80 Oe, and (iv) the lower nonmagnetic layer and at least the lower magnetic layer are formed by a wet-on-wet coating method.

REFERENCES:
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patent: 4963433 (1990-10-01), Ogawa et al.
patent: 5035948 (1991-06-01), Saito et al.
patent: 5156908 (1992-10-01), Araki et al.
patent: 5268206 (1993-12-01), Komatsu et al.
patent: 5304416 (1994-04-01), Goto et al.

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