Magnetic recording medium having multiple magnetic layers comprising magnetic particles and polyurethane resins having glass transition temperatures within specified ranges
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United States of America Patent
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Jun 7, 1994
Issued Date -
N/A
app pub date -
Mar 1, 1993
filing date -
Jan 23, 1990
priority date (Note) -
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Abstract
A magnetic recording medium is disclosed comprising a non-magnetic support having provided thereon a plurality of magnetic layers containing a ferromagnetic powder dispersed in a binder, wherein the lower magnetic layer closest to the support contains as the binder at least one polyurethane resin having a glass transition temperature (Tg) of from -50.degree. C. to -10.degree. C., and the uppermost magnetic layer contains as the binder at least one polyurethane resin having a glass transition temperature of from more than 40.degree. C. to 100 .degree. C. The magnetic recording medium of the present invention exhibits excellent running durability as well as electromagnetic conversion characteristics.
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