Magnetic recording medium having multiple magnetic layers with s

Details Magnetic recording medium having multiple magnetic layers with s Magnetic recording medium having multiple magnetic layers with s

1991-03-26

1993-09-14

Resan, Stevan A.

Stock material or miscellaneous articles

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

Particulate matter

4284259, 428413, 428480, 428522, 428523, 428524, 428532, 428694ST, 428900, 428694B, 427128, 427131, 252 6254, G11B 500

Patent

active

052447367

ABSTRACT:
A magnetic recording medium comprising a non-magnetic support having thereon a multi-layer magnetic layer structure comprising ferromagnetic fine powder and a binder, wherein said multi-layer magnetic layer structure is formed by coating a first composition containing the ferromagnetic fine powder and a polyisocyanate compound on the non-magnetic support to form a first magnetic layer and coating a second composition containing ferromagnetic fine powder and an epoxy compound having at least one epoxy group or a coupling agent on said first magnetic layer to form a second magnetic layer, wherein coating of said second magnetic layer is conducted simultaneously with or after coating said first magnetic layer while said first magnetic layer is still in a wet state, by a simultaneous or successive multiple layered coating method.

REFERENCES:
patent: 4851289 (1989-07-01), Ogawa et al.
patent: 5030481 (1991-07-01), Hashimoto et al.
patent: 5032428 (1991-07-01), Ogawa et al.

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