Biaxial orientierter Polyesterfilm

摘要

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 DEG C coated with a crosslinked polymer having a glass transition temperature of lower than 100 DEG 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.