Magnetic recording medium comprising plural magnetic layers

Details Magnetic recording medium comprising plural magnetic layers Magnetic recording medium comprising plural magnetic layers

1991-04-02

1992-07-21

Thibodeau, Paul J.

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

Particulate matter

4284259, 428694, 428900, 428407, 427128, G11B 500

Patent

active

051321793

ABSTRACT:
A magnetic recording medium comprising a non-magnetic support having thereon plural magnetic layers comprising a fine ferromagnetic powder and a binder and which are composed of at least two magnetic layers. In preparing the medium, a first magnetic layer-coating composition containing an epoxy compound having at least two epoxy groups is coated on the nonmagnetic support and a second magnetic layer-coating composition containing a polyisocyanate compound is coated over the first magnetic layer with a simultaneous or successive multiple layered coating method. The medium has an excellent electromagnetic characteristic and yields few dropouts, and it is usable as a medium for high density recording.

REFERENCES:
patent: 4963433 (1990-10-01), Ogawa et al.
patent: 5030481 (1991-07-01), Hashimoto et al.
patent: 5045351 (1991-09-01), Okita et al.
patent: 5082733 (1992-01-01), Watanabe et al.

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