| 摘要 |
PROBLEM TO BE SOLVED: To provide an easily stretchable polyester film which cannot perform low stress stretching at temperatures around 80°C but can perform low stress stretching at temperatures around 130°C.SOLUTION: A polyester film includes 80-65 mol% of ethylene glycol unit and 20-35 mol% of 1,4-cyclohexane dimethanol as glycol unit structural components, and has stress value at 5% elongation (F5 value) at 130°C in a range of 0.05 to 0.5 MPa and F5 value at 80°C of 10 MPa or more. |
