Heat sealable multilayer film containing polyvinyl alcohol...

B - Operations – Transporting – 32 – B

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B32B 27/08 (2006.01) B32B 27/30 (2006.01)

Patent

CA 2203915

A multilayer heat sealable film comprises: (a) a polyolefin film substrate layer; (b) a heat sealable acrylic polymeric coating; and (c) a layer of poly(vinyl alcohol) (PVOH) between (a) and (b). The film exhibits excellent oxygen and aroma barrier, and low minimum seal temperature and can be prepared by i) providing an oriented polypropylene film core layer; ii) coating said oriented polypropylene film core layer with PVOH on at least one side of said core layer to provide a PVOH coated oriented polypropylene film; and iii) coating the product of ii) with acrylic on said side coated with PVOH.

Un film thermosoudable multicouche comprend: (a) une couche de polyoléfine sur substrat; (b) un revêtement polymère acrylique thermosoudable; et (c) une couche d'alcool poly(vinylique) (PVOH) placée entre (a) et (b). Le film forme une excellente barrière à l'oxygène et aux arômes et présente une faible température minimale de scellement, ce film pouvant être obtenu i) par formation d'une couche centrale de polypropylène orientée; ii) par recouvrement de ladite couche centrale de polypropylène orientée avec le PVOH sur au moins un de ses côtés pour produire un film de propylène orienté recouvert de PVOH; et iii) par recouvrement du produit obtenu en ii) avec de l'acrylique sur ledit côté recouvert de PVOH.

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