Magnetic disc assembly comprising a disc having a magnetic layer

Details Magnetic disc assembly comprising a disc having a magnetic layer Magnetic disc assembly comprising a disc having a magnetic layer

1990-11-13

1992-11-17

Thiodbeau, Paul J.

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

428694, 428900, 4284259, 428 65, 360133, 206444, 252 6254, G11B 500

Patent

active

051642395

ABSTRACT:
A magnetic disc is disclosed, which comprises a disc-shaped magnetic recording medium having a magnetic layer comprising a ferromagnetic powder and a binder and a case having a liner of a nonwoven fabric comprising a polyester fiber or a polyacrylonitrile fiber in a ratio of not less than 30% by weight. The binder of the magnetic recording medium comprises a modified polyurethane resin containing a a polar group selected from the group consisting of a -SO.sub.3 M group, a --OSO.sub.3 M group, a --COOM group, a --PO(OM).sub.2 group and a --OPO(OM).sub.2 group, in which M is a hydrogen atom or a alkali metal atom, or a hydroxyl group provided that the polar group may form an intramolecular salt.

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patent: 4998176 (1991-03-01), Takemae et al.
patent: 5051287 (1991-09-01), Yamada et al.

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