| 摘要 |
<p>Provided is a polyester film which is industrially practicable, while having an excellent balance between the mechanical characteristics in the MD direction and the mechanical characteristics in the TD direction, excellent impact resistance and the like. This polyester film is formed of a polyester resin that contains 60% by mass or more of a polybutylene terephthalate, and has an elongation at break in the MD of 80% or more, an elongation at break in the TD of 80% or more, a plane orientation of 0.12-0.14, an impact strength of 0.05 J/mum or more and a puncture strength of 0.5 N/mum or more.</p> |
