Metallized opaque film

B - Operations – Transporting – 32 – B

Patent

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Details

B32B 27/32 (2006.01) B32B 27/20 (2006.01)

Patent

CA 2516584

The invention relates to metallized, biaxially oriented opaque polypropylene multilayer film comprising at least three layers consisting of a base layer, a first metallized covering layer, and of a second sealable covering layer on the opposite side. The first covering layer contains at least 80 % by weight of a propylene/ethylene copolymer, which has an ethylene content of 1.2 to < 2.8 % by weight and a propylene content of 97.2 to 98.8 % by weight, a melting point ranging from 145 to 160 ~C, and a melting enthalpy ranging from 80 to 110 J/g. The first covering layer has a thickness of at least 4 m and the base layer contains vacuoles. The thick covering layer can also be formed from a combination consisting of an intermediate layer with a thin covering layer.

L'invention concerne une feuille multicouche polypropylène opaque, orientée biaxialement, métallisée, comportant une couche de base, une première couche de couverture métallisée et une deuxième couche de couverture scellable sur le côté opposé. La première couche de couverture contient au moins 80 % en poids d'un copolymère propylène-éthylène, présentant une teneur en éthylène de 1,2 à < 2,8 % en poids, une teneur en propylène de 97,2 à 98,8 % en poids, un point de fusion de 145 à 160 ·C, et une enthalpie du point de fusion de 80 à 110 J/g. La première couche de couverture présente une épaisseur d'au moins 4 ?m et la couche de base est vacuolaire. La première couche de couverture peut être composée d'une combinaison d'une couche intermédiaire et d'une couche de couverture mince.

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