| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a heat-shrinkable laminated film excelling in heat shrinking performance, transparency and interlayer adhesion at an ordinary temperature, hardly peeled off even if treated at a high temperature and restrained from whitening that occurs when bending the film during processing or the like. <P>SOLUTION: In the heat-shrinkable film having adhesive layers between front-and-back layers and an intermediate layer where the front-and-back layers are composed of polyester-based resins, the intermediate layer is composed of a polystyrene-based resin and the adhesive layer is composed or a mixed resin composition of a polyester-based resin and apolystyrene-based resin; a shrinkage rate is 20% or higher in the main shrinkage direction when the heat-shrinkable film is submerged in the hot water of 80°C for 10 seconds, a content of the polyester-based resin is 40-80 mass% based on 100 mass% of the mixed resin composition in the adhesive layer and the size of a void generated in the adhesive layer within 5 mm perimeter centering on a bent part when shrunk by 10% in the main shrinkage direction in the hot water of 90°C after bending is 10μm or smaller. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
