Patent ID: 7727620

Claim:
A heat-shrinkable polyolefin series laminated film, comprising at least five layers, including two surface layers (I), plus at least three intermediate layers formed from intermediate layer (II) and intermediate layer (III), wherein said film has a heat shrinking ratio upon immersion in hot water at 80° C. for 10 seconds of 20% or more in the main shrinking direction of the film, and further wherein each said layer (I), (II), and (III) comprises as a main component the following constituents: Surface layer (I): a mixed resin of a cyclic olefin series resin and a polyethylene series resin (A) in a mass ratio of 90/10 to 50/50; Intermediate layer (II): a polyethylene series resin (B) whose crystal melting peak temperature (Tm) is no greater than 125° C., as measured with a differential scanning calorimeter (DSC); and Intermediate layer (III): a cyclic olefin series resin, wherein said film comprises a layer arrangement of (I) layer/(II) layer/(III) layer/(II) layer/(I) layer or (I) layer/(III) layer/(II) layer/(III) layer/(I) layer.