| 摘要 |
PROBLEM TO BE SOLVED: To prepare a heat-shrinakble polyester film, showing little shrinkage- induced spots when treated under severe shrinkage conditions for a short time, excellent in resistance to heat when exposed to high temperature e.g. when boiling-treated after being shrinkage-attached to bottles or the like or filled with a content of high temperature, and stably keeping outer appearance given by fine finishing. SOLUTION: This heat-shrinkable polyester film contains a copolymer component, decreases in density when heat-shrunk, and has a tensile storage elasticity modulus E' of 1.00×10<8> dynes/cm<2> or more or shear storage elastic modulus G' of 3.00×10<7> dynes/cm<2> or more, determined by the dynamic viscoelastic measurement for the sample ideally completing the secondary transition. |
