Magnetic recording media

Details Magnetic recording media Magnetic recording media

1991-12-11

1993-11-30

Thibodeau, Paul J.

Stock material or miscellaneous articles

Composite

Of polyamidoester

252 6254, 428694, 428900, B32B 2740, G11B 570

Patent

active

052664074

ABSTRACT:
In magnetic recording media consisting of a nonmagnetic substrate and one or more magnetizable layers bonded thereon and based on a polyurethane binder, the binder consists of not less than 50% by weight of an isocyanate-free, branched polyurethane which is soluble in tetrahydrofuran and has sulfonate groups along the polyurethane branches and OH-containing urea groups at the chain ends and a molecular weight of from 4,000 to 30,000.

REFERENCES:
patent: 2871218 (1959-01-01), Schollenberger
patent: 2899411 (1959-08-01), Schollenberger
patent: 4152485 (1979-05-01), Mizumura et al.
patent: 4420531 (1983-12-01), Tokuda
patent: 4423115 (1983-12-01), Tokuda
patent: 4477531 (1984-10-01), Kohler et al.
patent: 5082737 (1992-01-01), Bobrich et al.

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