| abstract |
By controlling skewness (Rsk) within a specific range, it is possible to achieve appropriate adhesion and releasability, and to achieve both in-process adhesion and releasability after the process. Providing a biaxially oriented polyester film suitable for heat-resistant release films, protective film applications where adhesion and peelability are important. A biaxially oriented polyester film for mold release satisfying the formula (I) having a skewness (Rsk) of at least one surface. −10 ≰ Rsk ・ 3 .. (I). A biaxially oriented polyester film for mold release in which the kurtosis (Rku) of the surface where the skewness (Rsk) satisfies the formula (I) satisfies the formula (II). 3≰Rku≰30 ・ ・ (II). [Selection figure] None |