Magnetic recording media having a branched thermoplastic polyure

Details Magnetic recording media having a branched thermoplastic polyure Magnetic recording media having a branched thermoplastic polyure

1990-08-23

1992-01-21

Cashion, Jr., Merrell C.

Stock material or miscellaneous articles

Composite

Of polyamidoester

428694, 428695, 428900, G11B 2300

Patent

active

050827375

ABSTRACT:
Magnetic recording media consist of a nonmagnetic substrate and at least one magnetizable layer which is firmly applied thereon and is based on a polyurethane binder which may be crosslinked with polyisocyanate, not less than 50% by weight of the binder consisting of a low molecular weight branched polyureaurethane having OH-containing urea groups at the chain ends, and the sliding properties of the said binder being improved and its coefficient of friction reduced by incorporation of siloxane groups.

REFERENCES:
patent: 2871218 (1959-01-01), Schollenberger
patent: 4005242 (1977-01-01), Kopke et al.
patent: 4775595 (1987-04-01), Hasegawa
patent: 4780365 (1988-10-01), Kakuishi et al.
Japanese Abs. 61/84 717.
Japanese Abs. 61/66 316.
Japanese Abs. 62/62 428.
Japanese Abs. 61/42 745 (corresponds to U.S. 4,780,365).

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