| 摘要 |
PROBLEM TO BE SOLVED: To provide a heat-shrinkable polystyrene laminated film which shows equally outstanding characteristics such as low spontaneous shrinkage factor, resistance to heat fusion bonding, transparency and shrink finish. SOLUTION: A mixed polymer obtained by blending a block copolymer comprising a vinyl aromatic hydrocarbon and a conjugated diene hydrocarbon and an aliphatic unsaturated carboxylate, is used as an intermediate layer. In addition, a mixed polymer composed mainly of a block copolymer comprising a styrene hydrocarbon and a conjugated diene hydrocarbon is used as a face and a back layer. Further, these face and back layers are laminated on the intermediate layer, and this laminate is at least monoaxially stretched. This heat-shrinkable polystyrene laminated film thus obtained is characterized in that the heat shrinkage factor at 80°C×10 seconds is 10% or higher at least in one direction. COPYRIGHT: (C)2003,JPO
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