| abstract |
Provided is a polyester film that can be industrially implemented and has excellent balance of mechanical properties in MD and TD directions, excellent impact resistance, and the like. A polyester resin containing 60% by mass or more of polybutylene terephthalate, having an MD breaking elongation of 80% or more, a TD breaking elongation of 80% or more, a plane orientation of 0.12 to 0.14, and an impact strength. A polyester film having 0.05 J / μm or more and a piercing strength of 0.5 N / μm or more is used. [Selection figure] None |