Highly oriented thermotropic magnetic recording medium
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United States of America Patent
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-
Jan 22, 1991
Issued Date -
N/A
app pub date -
Oct 10, 1989
filing date -
Sep 29, 1986
priority date (Note) -
Expired
status (Latency Note)
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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.
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