Polyester film for high density magnetic recording medium
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United States of America Patent
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Sep 3, 1991
Grant Date -
N/A
app pub date -
Jun 2, 1989
filing date -
Jun 3, 1988
priority date (Note) -
Expired
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Abstract
A polyester film suitable for a base of high density magnetic recording medium containing barium ferrite as a magnetic material characterized in that the centerline average roughness (Ra) is not more than 0.025 .mu.m and the F.sub.5 value in the longitudinal direction is not less than 14 kg/mm.sup.2 is disclosed wherein the polyester film exhibit excellent better durability when used with barium ferrite as a magnetic material.
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