Magnetic recording medium and method for making

Details Magnetic recording medium and method for making Magnetic recording medium and method for making

1990-12-26

1992-06-16

Thibodeau, Paul J.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Including a second component containing structurally defined...

427 48, 427130, 428329, 428336, 428694, 428900, G11B 2300

Patent

active

051224143

ABSTRACT:
In a magnetic recording medium comprising a magnetic layer containing a magnetic powder, 5 to 20% by weight based on the weight of the magnetic powder of a non-magnetic abrasive having a Mohs hardness of at least 6, and a binder on a non-magnetic substrate, the magnetic layer becomes more durable while maintaining electromagnetic properties by distributing the abrasive in the magnetic layer such that its concentration is highest in a surface-adjoining portion and continuously decreases therefrom toward the substrate side. The medium is prepared by applying a magnetic coating to a substrate and continuously passing the coated substrate through reversing magnetic fields prior to curing of the coating.

REFERENCES:
patent: 4518626 (1985-05-01), Kato et al.
patent: 4678682 (1987-07-01), Asai et al.
patent: 4743500 (1988-05-01), Miyoshi et al.
patent: 4745001 (1988-05-01), Miyoshi et al.
patent: 4861619 (1989-08-01), Satake
patent: 4917947 (1990-04-01), Kosha et al.
patent: 4965125 (1990-10-01), Masaki et al.

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