Polyester films, magnetic recording media and film capacitors produced therefrom
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United States of America Patent
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Feb 5, 1991
Grant Date -
N/A
app pub date -
Oct 12, 1989
filing date -
Feb 12, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Disclosed herein is a polyester film containing specific fine spherical silica particles. The film of the present invention is especially suitable as a base film for a magnetic recording medium or dielectric for a capacitor. The films of the present invention have the markedly improved properties such as surface properties, electromagnetic properties, electrical properties, etc. due to the excellent dispersibliity of the particles in the film.
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