Laminated polyester film for magnetic tape having specific surface properties
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United States of America Patent
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Nov 22, 1994
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N/A
app pub date -
Mar 5, 1992
filing date -
Mar 8, 1991
priority date (Note) -
Expired
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Abstract
A polyester film prepared through a lamination of at least two layers by coextrusion, wherein one of exposed surfaces (surface A) has a center line average roughness of from 0.002 to 0.015 .mu.m, a polyester layer forming the other of the exposed surfaces (surface B) has a lower melting point than a polyester forming the surface A, and the surface B has a degree of planar orientation of not larger than 0.100, which can be used as a base film for magnetic recording tape having no back coating.
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