Heat shrinkable polystyrene-based laminated film

摘要

PROBLEM TO BE SOLVED: To provide a heat shrinkable polystyrene laminate film having low natural shrinkage factor, and excellent heat resistant fusion bondability, transparency and shrinkage finishing properties. SOLUTION: The heat shrinkage polystyrene laminate film comprises an intermediate layer of rubber-like elastic material-dispersed polystyrene resin containing 1 to 20 wt.% of rubber-like elastic material as dispersed particles in a continuous phase of copolymer made of styrene monomer and (meth)acrylic ester monomer and having a peak temperature of loss elastic modulus (E") of 50 to 85 deg.C, and front and rear layers made of resin made of block copolymer of styrene hydrocarbon and conjugated diene hydrocarbon or mixed polymer obtained by mixing the block polymer with styrene polymer or mixed polymer resin obtained by mixing two or more types of block copolymers of different types and having storage elastic modulus (E') at 90 deg.C measured at vibration frequency of 10 Hz of 1.0109 dyn/cm2 to 9.0109 dyn/cm2 and laminated and oriented. In this case, the heat shrinkage of 100 deg.C1 min is at least 40% or more at least in one direction.