Biaxially oriented polyester film
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United States of America Patent
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Oct 29, 1991
Grant Date -
N/A
app pub date -
Dec 7, 1990
filing date -
Dec 14, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A biaxially oriented polyester film containing 0.01 to 4 wt %, based on the polyester film, of inorganic particles, the volumetric shape parameter being 0.02 to 0.2, the weight-average particle size being 0.05 to 3 .mu.m, and the ratio (Dw/Dn) of the weight-average particle size (Dw) and the number-average particle size (Dn) being not more than 1.1 is disclosed. The film of the present invention has a uniform surface and shows excellent running property and wear resistance so that it is useful as a base film for a magnetic tape, for example. Thus, the film of the present invention has a high industrial value.
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