PHOTOLUMINESCENT HEAT-SHRINKABLE FILMS.

摘要

The invention aims at providing a multi-layer heat-shrinkable styrenic film which makes it possible, even when the film is transparent, to see easily whether the film is accurately fitted on a beverage bottle or the like as a label. A heat-shrinkable styrenic film having at least one layer which comprises both a styrenic resin component containing a copolymer (b1) comprising 98 to 40wt% of a vinyl aromatic hydrocarbon and 2 to 60wt% of an aliphatic unsaturated carboxylic acid ester and/or a block copolymer (b2) comprising 70 to 85wt% of a vinyl aromatic hydrocarbon and 15 to 30wt% of a conjugated diene hydrocarbon and 100 to 2000ppm by weight of a fluorescent brightening agent based on the whole weight of the styrenic resin component; and a heat-shrinkable film composed of at least three layers, namely, a core layer made of the copolymer (b1) and/or the copolymer (b2) and face and back layers.