HEAT-SHRINKABLE POLYESTER FILM

摘要

PURPOSE:To prepare a heat-shrinkable polyester film having a high shrinkage factor at relatively low temperatures, excellent in shrink-adherence to a container such as a bottle and ink-adhesive properties and having no shrink- unevenness. CONSTITUTION:This heat-shrinkable polyester film is made of a polyester resin which comprises an acid component mainly comprising an aromatic dicarboxylic acid or its ester forming derivative and an alcohol component mainly comprising ethylene glycol. The sum of a ratio of acid components except terephthalic acid to the total acid components and a ratio of alcohol components except ethylene glycol to the total alcohol components is in the range of 5-40mol%. The polyester resin contains 1-30mol% naphthalenedicarboxylic acid component and 0.3-3mol% alkali salt of a sulfobenzenedicarboxylic acid based on the total acid components.