Polyester film for magnetic recording media
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United States of America Patent
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Apr 9, 1991
Grant Date -
N/A
app pub date -
Jun 2, 1989
filing date -
Jun 4, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Disclosed in this invention is a polyester film for magnetic recording media, containing 0.05 to 5% by weight of inactive inorganic particles (A) having a Mohs hardness of 6 or above and an average particle size of 0.005 to 1.0 .mu.m and 0.01 to 2.0% by weight of inactive particles (B) having an average particle size which is greater than that of the particles (A) and in the range of 0.1 to 3.0 .mu.m, the polyester film having an intrinsic viscosity in the range of 0.52 to 0.65. The polyester film of this invention is excellent in abrasion resistance, scuff resistance and slitting qualities and useful as a base film for magnetic recording media.
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