| abstract |
[PROBLEMS] To be excellent in moldability, solvent resistance and heat resistance at low temperature and low pressure, and have less precipitates and lower transparency in high-temperature environment after film processing and molding and after molding. Provided is a polyester film for molding that is small and has a low environmental impact. A polyester film for molding comprising a copolyester as a constituent component and comprising a biaxially oriented polyester film, wherein the stress at 100% elongation in the longitudinal direction and the width direction of the film is 10 to 1000 MPa at 25 ° C., 1 to 100 MPa at 100 ° C., storage viscoelastic modulus (E ′) in the longitudinal direction and width direction of the film is 10 to 1000 MPa at 100 ° C., 5 to 40 MPa at 180 ° C., and heat under micro tension of the film A molding polyester film having a deformation rate (longitudinal direction) of −3% to + 3% at 175 ° C. and an increase in haze after heat treatment at 170 ° C. for 10 minutes is 0.3% or less. |