HEAT-SHRINKABLE POLYSTYRENIC LAMINATED FILM

摘要

PROBLEM TO BE SOLVED: To provide a heat-shrinkable polystyrenic laminated film low in natural shrinkage factor and excellent in all of heat fusion resistance, transparency and shrink finish properties. SOLUTION: An intermediate layer is composed of a rubbery elastomer dispersed polystyrenic resin and upper and rear layers are based on a block copolymer consisting of styrenic hydrocarbon and conjugated diene hydrocarbon or a mixed polymer prepared by compounding a styrenic polymer with this block copolymer or a mixed polymer prepared by compounding two or more kinds of different block copolymers and characterized by that the amt. of the conjugated diene hydrocarbon of the resin constituting the upper and rear layers is 5-below wt.% are laminated on the intermediate layer and these layers are at least uniaxially stretched to form a heat-shrinkable polystyrenic laminated film of which the heat shrinkage factor of 80 deg.C×10 sec is at least 10% or more in one direction.