Polyester films suitable for use in magnetic recording media
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United States of America Patent
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Nov 24, 1987
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N/A
app pub date -
Feb 10, 1987
filing date -
Jun 8, 1982
priority date (Note) -
Expired
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Abstract
A polyester film suitable for use as a substrate for magnetic recording media, characterized in that said polyester film is a biaxially oriented polyester film having an average refractive index n and a planar orientation .DELTA.P, which respectively satisfy the following equations [I] and [II]: n.gtoreq.1.600 [I] .DELTA.P.ltoreq.(1.43.multidot.n)- 2.128 [II] and the surface roughness of the film is 0.015 .mu.m or lower.
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