| 摘要 |
PROBLEM TO BE SOLVED: To provide a heat-shrinkable laminated film having characteristics preferable for use application such as shrink packaging, shrink typing packaging, a shrink label, or the like. SOLUTION: Laminated film composed by providing surface and back layers on both sides of an interlayer for orientation, where a main component of the interlayer, and the surface and back layers is a block copolymer composed of a styrene hydrocarbon and a conjugated diene hydrocarbon, or a blended polymer composed by blending a styrene polymer to the said block copolymer, or mixed polymer resin composed of blending two or more different types of block copolymers. A Vicat softening temperature of the resin composing the interlayer is 50-85 deg.C, a Vicat softening temperature of the resin composing the surface and back layers is 55-95 deg.C, which is 5-45 deg.C higher than the Vicat softening temperature of the interlayer resin. A heat-shrinkage factor at 100 deg.C×1 min. of the laminated film is, at least in one direction, 40% or higher. |
