| 摘要 |
PROBLEM TO BE SOLVED: To provide a heat-shrinkable film in which natural shrinkability and defective break resistance are excellent. SOLUTION: The heat-shrinkable film consists of composition of polystyrene resin and an epoxidized diene-based block copolymer. Or, the heat-shrinkable film consists of composition of 70-95 wt.% polystyrene and 30-5 wt.% epoxidized diene-based block copolymer or consists of composition in which the epoxidized diene-based block copolymer is blended with polystyrene resin. Coefficient of heat shrinkage in the lateral direction for 80 deg.C×10 seconds is 30-40% and coefficient of heat shrinkage in the lateral direction for 30 deg.C×30 days is <=2.5% and coefficient of heat shrinkage in the longitudinal direction for 100 deg.C×5 minutes is <=30%. |
