BIAXIALLY ORIENTED POLYPROPYLENE FILM AND METHOD FOR PRODUCING SAME

摘要

A biaxially oriented polypropylene film which has a stress in the longitudinal direction of the film at the elongation of 5% (TD-F5 value) of more than 100 MPa, while having a thermal shrinkage of 2% or less in the longitudinal direction of the film if heated at 120°C for 15 minutes. Provided is a biaxially oriented polypropylene film which is able to exhibit excellent withstand voltage properties and reliability at high temperatures even if used in capacitors for high voltage, while achieving a good balance between rigidity enhancement and dimensional stability suitable for use in capacitors.