Polyester film for magnetic recording media
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United States of America Patent
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Nov 17, 1992
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N/A
app pub date -
Jun 5, 1991
filing date -
Jun 7, 1990
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Abstract
A biaxially oriented polyester film containing a specific calcium carbonate is described. The calcium carbonate contained in the film is specified by its vaterite form, its average particles size of 0.07 to 1.5 .mu.m, and its particle size distribution ratio of not more than 2.00. The biaxially oriented polyester film containing such specific calcium carbonate is excellent in both the running property and wear resistance, and suitable for the use as a base of magnetic recording media.
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