| 摘要 |
Heat shrinkable polystyrene films are provided which are excellent in shrinkage finish properties, low-temperature shrinkability, and resistance to solvents, and have low shrinkage stress, and in which natural shrinkage, a reduction in elongation by printing, and shrinkage due to solvents are suppressed. The films are laminated films which have at least three layers, and outer layers of the laminated films are made of a predetermined styrene-butadiene block copolymer and an intermediate layer of the laminated films is made of a mixture of a predetermined styrene-butadiene block copolymer and another styrene-butadiene block copolymer and/or a styrene-butadiene-isoprene copolymer. As the laminated films, multilayer heat shrinkable polystyrene films are used which are at least monoaxially stretched. The ratio of thickness of their intermediate layer to the total thickness of the laminated films is from 60% to 85%, and the maximum value of the shrinkage stress at 90
C in the main shrinkage direction is at most 2.5 MPa. |
