| 摘要 |
PROBLEM TO BE SOLVED: To provide a multi-layered polystyrene heat-shrinkable film, wherein a natural shrinkage factor is reduced, and strength, surface characteristics, nerve, shrink characteristics at low temperatures or the like is improved. SOLUTION: A multi-layered polystyrene heat-shrinkable film has at least a three-layered structure, wherein both outer layers are formed of a mixture composed of 90-100 wt.% SBS block copolymer containing 15 wt.% or higher butadiene and 10-0 wt.% polystyrene, and an interlayer is formed of a mixture composed of 10-55 wt.% SBS block copolymer containing 15 wt.% or higher butadiene and 90-45 wt.% styrene-butyl acrylate copolymer. A proportion of the interlayer to the entire film is 50-90 wt.% and overall butadiene content in the entire film is 5-15 wt.%. |
