Magnetic recording medium

Details Magnetic recording medium Magnetic recording medium

1997-02-18

1999-07-13

Kiliman, Leszek

Stock material or miscellaneous articles

Composite

Of inorganic material

428694BU, 428694BB, 428694BA, 428694ST, 428694SL, 428900, G11B 566

Patent

active

059224835

ABSTRACT:
A magnetic recording medium having a total thickness of not more than 11 .mu.m is disclosed, comprising a non-magnetic support having a magnetic layer comprising a ferromagnetic powder dispersed in a binder provided on one surface of the non-magnetic support and a back layer provided on the other surface of the non-magnetic support, wherein the non-magnetic support has a longitudinal Young's modulus (E.sub.MD) and a crosswise Young's modulus (E.sub.TD) such that the sum of E.sub.MD and E.sub.TD is not less than 1,200 kg/mm.sup.2 and the ratio of E.sub.MD to E.sub.TD is from 1/1 to 1/3 and an intrinsic viscosity of from 0.50 to 0.60 and the magnetic layer comprises a polyurethane resin with a weight-average molecular weight of from 30,000 to 60,000 having a component having a molecular weight of not more than 5,000 in an amount of not more than 4.5%.

REFERENCES:
patent: 4316927 (1982-02-01), Kimura
patent: 5055349 (1991-10-01), Yasufuku
patent: 5196265 (1993-03-01), Kyoke
patent: 5419961 (1995-05-01), Kobayashi
patent: 5510168 (1996-04-01), Mori
patent: 5525404 (1996-06-01), Hatanaka

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