Patent ID: 8673414
Filing Date: 2014-03-18
Classification: B29C,B29K,B29L,B65B,C08J,Y10T

Abstract:
1. A heat-shrinkable polyester film made of a polyester resin comprising ethylene terephthalate as a main constituent and containing 15% by mole or more of at least one monomer capable of forming an amorphous component in the whole components of the polyester resin, wherein the film is drawn longitudinally 2.8 times or more and 4.5 times or less in total, and satisfies the following requirements (1) to (4): (1) hot-water heat shrinkage in the width direction is 40% or more and 80% or less when being treated in hot water at 90° C. for 10 seconds; (2) hot-water heat shrinkage in the longitudinal direction is 0% or more and 15% or less when being treated in hot water at 90° C. for 10 seconds; (3) right-angled tearing strength per unit thickness in the longitudinal direction is 90 N/mm or more and 280 N/mm or less after being shrunk by 10% in the width direction in hot water at 80° C.; and (4) tensile breaking strength in the longitudinal direction is 130 MPa or more and 300 MPa or less.