| abstract |
(57) [Problem] To provide a heat-shrinkable polystyrene-based laminated film having a low natural shrinkage rate and excellent in any of heat-resistant fusion property, transparency and shrinkage finish property. SOLUTION: A rubber-like elastic material-dispersed polystyrene resin is used as an intermediate layer, and a block copolymer composed of a styrene-based hydrocarbon and a conjugated diene-based hydrocarbon is used as a front and back layer, or a styrene-based polymer is blended with this block copolymer. Or a mixed polymer obtained by blending two or more different types of block copolymers as a main component, and the resin constituting the front and back layers has a conjugated diene-based hydrocarbon content of 5 to 30. A film in which a resin of less than 10% by weight is laminated on the intermediate layer as a front and back layer and stretched at least uniaxially, 0 ° C. × 10 seconds heat shrinkage rate is 1 in at least one direction A heat-shrinkable polystyrene-based laminated film having a content of 0% or more. |