Method for producing a polyolefin and a heat-shrinkable label container with polyolefin heat-shrinkable label

摘要

PROBLEM TO BE SOLVED: To obtain a polyolefin-based heat-shrinkable label which can be prevented from tearing from upper and lower ends during or after heat shrinking even if the label includes a water-based ink print layer.;SOLUTION: The polyolefin-based heat-shrinkable label has a base film comprising a center layer made of a propylene-based random copolymer and a surface layer made of an amorphous cyclic olefin-based polymer, and a print layer containing water-based ink provided on at least one of surfaces of the base film. Average maximum roughness on an end surface at least at an end with a smaller factor of shrinkage when mounted on a container among those ends to be upper and lower ends when the label is formed to be cylindrical and mounted on the container is 100 μm or less. The propylene-based random copolymer of the center layer may be the copolymer obtained by copolymerization using a metallocene catalyst, and the amorphous cyclic olefin- based polymer of the surface layer may be an open circular polymer of a cyclic olefin or its hydrogenated substance.;COPYRIGHT: (C)2003,JPO