STRETCHED FILM HAVING HIGH HEAT RESISTANCE

摘要

PROBLEM TO BE SOLVED: To provide a stretched film having high heat resistance that is made of a thermoelastic polyester resin composition and is excellent in heat-resistant dimensional stability and mechanical strength at a high temperature.SOLUTION: A stretched film having high heat resistance is made of a thermoelastic polyester resin composition containing glass staple fiber, the glass stable fiber having a diameter of 0.1-7.0μm and a mean fiber length of 1-300μm. The stretched film having high heat resistance has a storage elastic modulus of 200 MPa or higher at 260°C in the longitudinal direction of the film in viscoelasticity measurement, and a thermal shrinkage of 1.0% or less in both the longitudinal and width directions of the film when subjected to heat treatment at 260°C for 10 minutes.