Magnetic recording medium comprising magnetic particles and a sp

Details Magnetic recording medium comprising magnetic particles and a sp Magnetic recording medium comprising magnetic particles and a sp

1991-12-19

1995-05-16

Resan, Stevan A.

Stock material or miscellaneous articles

Composite

Of polyamidoester

428694BU, 428694BL, 428900, 252 6254, G11B 500

Patent

active

054159415

ABSTRACT:
A magnetic recording medium comprise a non-magnetic support and a magnetic layer formed thereon which is made of a composition comprising ferromagnetic particles and a resinous binder. The resinous binder comprises a polyurethane resin containing at least a high molecular polyol (A) and a diisocyanate (B) as its constituents. The high molecular polyol (A) comprises a polyol (a.sub.1) having a glass-transition temperature of 20.degree. C. or more and having a number average molecular weight in the range of 500 to 10,000, and the polyurethane resin has at least one hydroxyl group at its molecular terminals and the urethane bond concentration of the polyurethane resin is in the range of 500 to 1,500 equivalents/10.sup.6 g.

REFERENCES:
patent: 4855377 (1989-08-01), Yokota et al.
patent: 5045622 (1991-09-01), Kohno et al.
patent: 5124424 (1992-06-01), Endo et al.
patent: 5178952 (1993-01-01), Yamamoto

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