Highly oriented fluoropolymer films

B - Operations – Transporting – 32 – B

Patent

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Details

B32B 27/08 (2006.01) B29C 47/06 (2006.01) B29C 55/02 (2006.01) B29C 55/04 (2006.01) B32B 27/32 (2006.01) B32B 37/00 (2006.01) B29C 47/00 (2006.01)

Patent

CA 2259004

The present invention provides highly oriented multilayer films. They are produced by coextruding or laminating films having at least one layer of a fluoropolymer, at least one layer of a polyolefin homopolymer or copolymer and an intermediate adhesive layer of a polyolefin having at least one functional moiety of an unsaturated carboxylic acid or anhydride thereof. With this structure the polyolefin layer allows the fluoropolymer layer to be stretched up to ten times its original length. Such a high orientation ratio for the fluoropolymer film increases the mechanical strength, toughness, and water vapor barrier properties of the film while using a thinner gauge fluoropolymer film. Coextrusion processing can be done at higher temperatures, i.e. in the range of from at about 280 °C to about 400 °C. These temperatures allow films to be produced in the absence of polymer degradation and film melt fracture.

L'invention concerne des films multicouches à fort étirage. On les fabrique par coextrusion ou laminage de films à au moins une couche en fluoropolymère, au moins une couche en copolymère ou en homopolymère de polyoléfine et une couche adhésive intermédiaire en polyoléfine ayant une fraction fonctionnelle d'acide carboxylique insaturé ou d'un anhydride de celui-ci. Dans une telle structure, la couche de polyoléfine rend la couche en fluoropolymère étirable jusqu'à dix fois sa longueur initiale, d'où un fort étirage qui permet d'améliorer les caractéristiques (résistance mécanique, ténacité et écran antivapeur) du film de fluoropolymère même à épaisseur réduite. La coextrusion est possible à plus haute température, c'est-à-dire entre 280 DEG C et 400 DEG C environ, oú l'on peut fabriquer des films sans dégradation du polymère et sans fracture de fusion du produit.

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