Magnetic recording medium

Details Magnetic recording medium Magnetic recording medium

1989-10-10

1993-01-12

Thibodeau, Paul J.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

428336, 4284259, 428694, 428900, G11B 2300

Patent

active

051789353

ABSTRACT:
A magnetic recording comprising a non-magnetic support having thereon first and second magnetic layers containing a binder and a ferromagnetic powder. In a first embodiment, the content of the binder in each magnetic layer containing a vinyl chloride resin or a cellulose resin is characterized in relation to the quantity of the ferromagnetic powder contained therein. In a second embodiment, each of the magnetic layers is characterized in terms of a difference in glass transition point of a polyurethane resin contained therein. In a third embodiment, each of the magnetic layers is characterized in terms of thickness and polyisocyanate content, wherein the content of the polyisocyanate in the first magnetic layer is at least one part by weight larger than the amount of the polyisocyanate in the second magnetic layer.

REFERENCES:
patent: 4741953 (1988-05-01), Katsuta et al.
patent: 4844946 (1989-07-01), Komatsu et al.
patent: 4980230 (1990-12-01), Saito et al.

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