| 摘要 |
PROBLEM TO BE SOLVED: To provide a film having excellent characteristics (light-weight, cushioning property, etc.), and good handleability (transportability) derived from its void-containing structure. SOLUTION: The void-containing polyester film contains a number of voids derived from a thermoplastic resin incompatible with a polyester resin. The curling value of the film is <=2 mm after the storage in rolled form and 0-5 mm or below after the heat-treatment at Tg+30 deg.C for 30 min without applying a load. |
