| 摘要 |
PURPOSE:To obtain shrink film having specified heat shrink characteristics by a method wherein polyester composition prepared by mixing polyester, which is obtained by polycondensing mixed diol constituent having specified composition and dicarboxylic acid constituent mainly made of terephthalic acid, with polyester, which is obtained by polycondensing mixed dicarboxylic constituent having specified composition and diol constituent mainly made of ethylene glycol, in the specified ratio is formed. CONSTITUTION:Film is formed out of the polyester composition consisting of 75-55wt.% of polyester, which is composed of dicarboxylic acid constituent unit mainly made of terephthalic acid and mixed diol constituent unit consisting of 80-60mol.% of ethylene glycol and 20-40mol.% of cyclohexane dimethanol, and 25-45wt.% of polyester, which is composed of mixed dicarboxylic acid constituent unit consisting of 90-75mol.% of terephthalic acid and 10-25mol.% of adipic acid and diol constituent unit mainly made of ethylene glycol and, in addition, the adipic acid constituent unit in the total dicarboxylic acid constituent unit is 4-10mol.%, so as to stretch at least to one direction by the draw ratio of 150-800% in order to obtain the shrink film concerned. |
