| 摘要 |
A shrinkable copolyester film having shrinkage of not less than 30% in the direction (main shrink direction) of either the machine direction or the transverse direction after 5 min treatment in an air oven at 100 DEG C, a shrinkage of not more than 20% in the other direction perpendicular to the main shrink direction after 5 min treatment in an air oven at 100 DEG C, an initial shrinkage stress (F0) of not more than 2000 g/mm<2> in the main shrink direction during the course of 5 sec after dipped in a silicone oil of 75 DEG C, a shrinkage stress (F20) of not less than (F0 - 100) g/mm<2>, after 20 sec dipping in a silicone oil at 75 DEG C, and a glass transition temperature of 35 to 65 DEG C, is disclosed. The shrinkable copolyester film of the present invention is excellent in shrinkage properties, i.e., substantially free from wrinkles, distortion of film and uneven shrinkage, and is suitable for shrinkable label for a PET bottle, etc. |
