Magnetic recording medium

Details Magnetic recording medium Magnetic recording medium

1984-10-22

1987-01-20

Robinson, Ellis P.

Stock material or miscellaneous articles

Composite

Of polyamidoester

360134, 360135, 360136, 427128, 427131, 428694, 428900, G11B 572

Patent

active

046379592

ABSTRACT:
A magnetic recording medium comprised of a non-magnetic substrate and a magnetic layer formed on one surface of the substrate and consisting essentially of a binder and magnetic powders. As the binder, a thermoplastic polyurethane-urea resin is employed, in which hydrophilic polar groups are introduced. The thermoplastic polyurethane-urea resin contains urethane and urea bonds in the molecule thereof and may be synthesized from a long-chain diol with a molecular weight of about 500 to 5000, a short-chain diol with a molecular weight of about 50 to 500, an organic diisocyanate and an organic diamine. Examples of the thus introduced hydrophilic polar groups are: ##STR1##

REFERENCES:
patent: 3650828 (1972-03-01), Higashi
patent: 4152485 (1979-05-01), Mizomura
patent: 4328282 (1982-05-01), Lehner
patent: 4328935 (1982-05-01), Steel
patent: 4404253 (1983-09-01), Kohler
patent: 4419406 (1983-12-01), Isobe
patent: 4529661 (1985-07-01), Ninomiya
patent: 4567108 (1986-01-01), Lehner
patent: 4567109 (1986-01-01), Lehner
patent: 4568610 (1986-02-01), Lehner
patent: 4568612 (1986-02-01), Lehner

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