Magnetic recording medium having multiple magnetic layers compri

Details Magnetic recording medium having multiple magnetic layers compri Magnetic recording medium having multiple magnetic layers compri

1993-03-01

1994-06-07

Resan, Stevan A.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

428216, 428328, 428336, 4284246, 4284251, 4284259, 428522, 428694BM, 428694BS, 428694BP, 428900, 427131, 427548, 427599, G11B 500

Patent

active

053188284

ABSTRACT:
A magnetic recording medium is disclosed comprising a non-magnetic support having provided thereon a plurality of magnetic layers containing a ferromagnetic powder dispersed in a binder, wherein the lower magnetic layer closest to the support contains as the binder at least one polyurethane resin having a glass transition temperature (Tg) of from -50.degree. C. to -10.degree. C., and the uppermost magnetic layer contains as the binder at least one polyurethane resin having a glass transition temperature of from more than 40.degree. C. to 100 .degree. C.
The magnetic recording medium of the present invention exhibits excellent running durability as well as electromagnetic conversion characteristics.

REFERENCES:
patent: 4812369 (1989-03-01), Hanai et al.
patent: 4980230 (1990-12-01), Saito et al.
patent: 5084335 (1992-01-01), Nakano et al.
patent: 5094910 (1992-03-01), Kaneno et al.
"Polymer Chemistry" Malcolm P. Stevens, Oxford University Press 1990 p. 81.

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