Biaxially oriented polyester film containing multilayered cross-linked particles
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United States of America Patent
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Mar 31, 1992
Grant Date -
N/A
app pub date -
Dec 7, 1990
filing date -
Dec 14, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A biaxially oriented polyester film containing 0.01 to 4 wt % of multilayered high-molecular particles having a weight-average particle size of 0.05 to 3 .mu.m which comprise core crosslinked high-molecular particles having a glass transition temperature of not lower than 100.degree. C. coated with a crosslinked polymer having a glass transition temperature of lower than 100.degree. C., the ratio Dw/Dn of the weight-average particle size (Dw) and the number-average particle size (Dn) being not more than 1.3 is disclosed. The film of the present invention has excellent running property and wear resistance and is useful as a base film for various products such as magnetic recording media, capacitors, photomechanical plates, electric insulators, heat-sensitive transfer film, packaging film, transfer marks and gold and silver threads. Thus, the present invention has a high industrial value.
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