Biaxially oriented polyester film for magnetic recording medium
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United States of America Patent
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Sep 23, 1997
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N/A
app pub date -
Jun 7, 1995
filing date -
Sep 29, 1992
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Abstract
A biaxially oriented polyester film for a magnetic recording medium contains: 1) at least two different sizes of synthetic calcium carbonate particles; and 2) aluminum oxide particles to produce a film with excellent surface uniformity, running properties, and slittability wherein the film generates few scratches and low amounts of abrasion dust. The synthetic calcium carbonate particles are surface treated with a polycarboxylic acid, followed by treatment with a phosphorus compound. The biaxially oriented polyester film can comprise a layer in a multilayer film.
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