BIAXIALLY ORIENTED POLYPROPYLENE FILM

摘要

[Problem] To provide a biaxially oriented polypropylene film exhibiting superior voltage resistance and reliability at high temperatures when used in a high voltage capacitor, and having a storage elastic modulus that is optimal for use in said capacitor and has low temperature dependence. [Solution] A biaxially oriented polypropylene film in which, in a solid viscoelasticity measurement, the relationship of the storage elastic modulus (E'23) at 23˚C in the film width direction and the storage elastic modulus (E'125) at 125˚C satisfies (E'125)/(E'23)>0.2.