Biaxially oriented multilayer heat sealable packaging film

B - Operations – Transporting – 32 – B

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B32B 27/08 (2006.01) B32B 15/08 (2006.01) B32B 27/32 (2006.01)

Patent

CA 2206570

A biaxially oriented heat sealable multilayer film structure, suited for use in high altitude applications, which comprises: (a) a core substrate having two surfaces, comprising i) a layer of homopolymer polyolefin and ii) a layer of block copolymer of ethylene and propylene having a MFR of 1 to 10, adjacent to at least one side of i); (b) a polymeric heat sealable layer on one surface of said core substrate, said heat sealable layer comprising a polymeric material selected from the group consisting of a terpolymer of ethylene, propylene and butene-1, a random copolymer of ethylene and propylene, a random copolymer of propylene and butene-1, and blends thereof; and optionally, (c) a high density polyethylene (HDPE) layer adjacent to the other surface of said core substrate (a).

Structure de pellicule d'emballage multicouche thermoscellable orientée bi-axialement, adaptée à un usage en haute altitude, qui comprend les éléments suivants: (a) un substrat de base à deux surfaces constitué d'une couche de polyoléfine homopolymère et d'une couche de copolymère séquencé d'éthylène et de propylène ayant un taux de fluage de 1 à 10 et contiguë à au moins un côté de la couche précédente; (b) une couche thermoscellable en polymère sur une des surfaces dudit substrat de base, la couche thermoscellable étant constituée d'une matière polymère sélectionnée à partir du groupe comprenant un copolymère triple d'éthylène, de propylène et de butène-1, un copolymère statistique d'éthylène et de propylène, un copolymère statistique de propylène et de butène-1, ainsi que leurs mélanges; et éventuellement, (c) une couche en polyéthylène haute densité (PEHD) contiguë à l'autre surface dudit substrat de base (a).

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