| 摘要 |
PROBLEM TO BE SOLVED: To provide a heat shrinkable polyester based film excellent in shrinking properties at a low temperature, low in shrinking irregularity, longitudinal sink mark and excellent in resistance to breakage. SOLUTION: This oriented film is formed from a polyester composed of a dicarboxylic acid component, a polyvalent alcohol component containing at least one dimer-diol as a component. In this case, the oriented film has the shrinkage in a hot air at 90 deg.C at least in one direction of 30 to 70%, shrinkage stress of 0.2 to 0.6kg/mm<2> , initial breaking rate of 0%. |
