Polyolefin/filler films having increased wvtr and method for...

B - Operations – Transporting – 32 – B

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B32B 5/02 (2006.01) A61F 13/15 (2006.01) B29C 55/00 (2006.01) B32B 27/12 (2006.01) B32B 27/20 (2006.01)

Patent

CA 2262364

Films, made of polyethylenes and fillers, and articles made therefrom greater WVTR than previously available films based on conventional Zeigler-Natta based polyethylenes. The polyethylenes are produced in a metallocene-catalyzed production process. The films may be made by a cast film process, and may be made in widely varying filler content, generally polyethylene to filler ratios of 30/70 to 70/30. The metallocene based polyethylenes when combined with filler also permit the extrusion of thinner films leading to lighter weight and softer films. The m-polyethylenes utilized for making such films typically have a Composition Distribution Breadth Index above 50 %, a Mw/Mn below 3, and a Mz/Mw below 2.

Feuils fabriqués en polyéthylènes et en matériaux de charge, et articles fabriqués à partir de ces feuils, présentant une vitesse supérieure de transmission de vapeur d'eau (WVTR) par rapport aux feuils actuels basés sur des polyéthylènes classiques de Zeigler-Natta. On produit ces polyéthylènes dans un processus comportant un catalyseur de métallocène. On peut fabriquer les feuils au moyen d'un procédé de coulage et leur conférer une teneur en charge extrêmement variable, en général, selon des rapports entre polyéthylène et charge de 30/70 à 70/30. Ces polyéthylènes à base de métallocène, quand on les combine à une charge, permettent également l'extrusion de feuils plus minces, ce qui permet d'obtenir des feuils plus légers et plus mous. Les m-polyéthylènes utilisés pour fabriquer ces feuils présentent généralement un indice de largeur de répartition de composition supérieur à 50 %, un M¿w?/M¿n? inférieur à 3 et un M¿z?/M¿w? inférieur à 2.

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