Biaxially oriented polyester film
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United States of America Patent
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Mar 17, 1992
Grant Date -
N/A
app pub date -
Jun 1, 1990
filing date -
Jun 2, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A biaxially oriented polyester film containing 0.05 to 3 wt % of agglomerates of primary particles of aluminum oxide having an average particle size of 5 to 40 nm, the agglomerates having an average particle size of 50 to 400 nm. The film of the present invention is excellent in the wear resistance against various members such as a metal pin, and suitable for various industrial purposes including a base film of a magnetic recording medium.
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