Magnetic recording medium having two magnetic layers each contai

Details Magnetic recording medium having two magnetic layers each contai Magnetic recording medium having two magnetic layers each contai

1989-02-13

1992-08-25

Thibodeau, Paul J.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Physical dimension specified

428694, 4284233, 4284259, 4284246, 428900, G11B 500

Patent

active

051418088

ABSTRACT:
A magnetic recording medium comprising a nonmagnetic support having thereon a lower magnetic layer and a upper magnetic layer, in this order, wherein the lower magnetic layer contains as a binder a polyurethane reisn having a number average molecular weight of less than 25,000, and the upper magnetic layer contains as a binder (a) a polyurethane resin having (i) at least three organic groups having an active hydrogen per polyurethane molecule and (ii) a number average molecular weight of 25,000 or more, and (b) a polyisocyanate.

REFERENCES:
patent: 4699969 (1987-10-01), Re et al.
patent: 4795672 (1989-01-01), Takeda et al.
patent: 4857388 (1989-08-01), Ogawa et al.
patent: 4980230 (1990-12-01), Saito et al.

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