Photoluminescent heat-shrinkable films

C - Chemistry – Metallurgy – 08 – L

Patent

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Details

C08L 25/08 (2006.01) B32B 27/18 (2006.01) B32B 27/30 (2006.01) B65D 23/08 (2006.01) C08L 53/02 (2006.01)

Patent

CA 2669245

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.

L'invention vise à proposer un film styrénique thermorétractable multicouche qui permet de voir facilement, même lorsque le film est transparent, si le film est adapté avec précision, tel une étiquette, sur une bouteille de boisson ou autre récipient similaire. Le film styrénique thermorétractable possède au moins une couche qui comporte à la fois un composant de résine styrénique contenant un copolymère (b1) comportant 98 à 40 % en poids d'un hydrocarbure vinyl aromatique et 2 à 60 % en poids d'un ester d'acide carboxylique insaturé aliphatique et/ou un copolymère à blocs (b2) comportant 70 à 85% en poids d'un hydrocarbure vinyl aromatique et 15 à 30 % en poids d'un hydrocarbure diène conjugué et 100 à 2 000 ppm en poids d'un brillanteur fluorescent sur la base du poids total du composant de résine styrénique ; et le film thermorétractable est composé d'au moins trois couches, à savoir une couche noyau faite du copolymère (b1) et/ou du copolymère (b2) et des couches de face et arrière.

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