Biaxial orientierte Polyesterfolie.

摘要

A biaxially oriented polyester film containing 0.05 to 3 wt% of agglomerates of primary particles of aluminuin oxide having an average particle size of 5 to 40 nm, the agglomerates having an average particle size of 50 to 400 nm. The film of the present invention is excellent in the wear resistance against various members sub as a metal pin, and suitable for various industrial purposes including a base film of a magnetic recording medium.