Polyester films suitable for use in magnetic tapes
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United States of America Patent
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Aug 30, 1988
Issued Date -
N/A
app pub date -
Jul 7, 1986
filing date -
Sep 11, 1979
priority date (Note) -
Expired
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Abstract
There is disclosed a polyester film suitable for use in magnetic tapes having the characteristics represented by the following equations: ##EQU1## wherein N.sub.1 is the number of peaks of surface projections per millimeter; h is the average height in .mu.m of the surface projections; .theta. is the average steepness in degree of the surface projections; H.sup.2 is the mean square height in .mu.m.sup.2 of the surface projections; and n is the average refractive index.
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