Magnetic recording medium having a calendered polyester layer with a specified deformation ratio
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United States of America Patent
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Jul 2, 1996
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N/A
app pub date -
Oct 25, 1994
filing date -
Nov 1, 1993
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Abstract
The disclosure describes a high-density magnetic recording medium comprising a biaxially oriented, laminated polyester film which is coextruded, so that a polyester A layer subject to plastic deformation by calendering treatment forms one of the surfaces of a base film, and a magnetic layer formed on the surface of the polyester A layer and composed of a magnetic substance dispersed in a resin binder, the thickness (t.sub.A) of the polyester A layer and the thickness (t.sub.M) of the magnetic layer satisfying the following formulae at the same time. 0.01 .mu.m.ltoreq.t.sub.M .ltoreq.2.0 .mu.m (1) 0.05 .mu.m.ltoreq.t.sub.A (2) t.sub.A +t.sub.M .ltoreq.5 .mu.m (3).
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