Highly oriented thermotropic magnetic recording medium

Details Highly oriented thermotropic magnetic recording medium Highly oriented thermotropic magnetic recording medium

1989-10-10

1991-01-22

Thibodeau, Paul J.

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

428480, 428694, 428900, 528190, 528191, G11B 2300

Patent

active

049870203

ABSTRACT:
Smooth, thin, dimensionally stable, essentially circular and planar injection-molded disc members, well adapted as substrates for magnetic recording discs, e.g., by providing same with an effective recording amount of a magnetic coating material on at least one of the face surfaces thereof, comprise a radially molecularly oriented thermotropic polymer, desirably having a flow temperature ranging from 200.degree. C. to 350.degree. C. and an inherent viscosity of at least 1 dl g.sup.-1.

REFERENCES:
patent: 4248995 (1981-02-01), Fayolle
patent: 4284757 (1981-08-01), Fayolle
patent: 4311824 (1982-01-01), Fayolle
patent: 4355133 (1982-10-01), East et al.
patent: 4652479 (1987-03-01), Suzuki et al.
patent: 4680211 (1987-07-01), Evans et al.
patent: 4719171 (1988-01-01), Ikenaga et al.

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