HEAT-SHRINKABLE POLYESTER FILM

摘要

PROBLEM TO BE SOLVED: To provide a heat-shrinkable polyester film with an improved breakage resistance without degrading other properties such as finish properties of shrinking. SOLUTION: This heat-shrinkable polyester film comprising 10-30 mol% of isophthalic acid as a dicarboxylic acid component has cyclohexanedimethanol (CHDM) as a diol component that has a higher ability to lower crystallinity than isophthalic acid so that the elongation in an unstretched direction is made to be >=10%. The content of CHDM is 8-35 mol%, preferably 10-35 mol% and more preferably 13-23 mol%, based on 100 mol% of the total diol components. By virtue of the existence of the diol component, the crystallinity of the heat- shrinlkable film is lowered and the elongation in an unstretched direction is improved. As a result, breakage resistance is improved while properties necessary for a heat-shrinkable film such as finished properties of shrinking are not degraded.