Bioriented polyethylene film with a high water vapor...

B - Operations – Transporting – 29 – C

Patent

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B29C 47/06 (2006.01) B29C 39/20 (2006.01) B29C 55/02 (2006.01) B29C 55/12 (2006.01) B32B 5/18 (2006.01) B32B 27/08 (2006.01) B32B 27/32 (2006.01) C07K 14/26 (2006.01) C08J 5/18 (2006.01)

Patent

CA 2333196

Methods of producing polyethylene films having a desired water vapor transmission rate (WVTR) are provided. The methods include casting a polyethylene sheet which has a base layer of a polyethylene and a cavitating agent, and at least one layer of a WVTR-controlling material, and subsequently biaxially orienting the sheet to yield a film having the desired WVTR. The base layer has a porous microstructure and a WVTR substantially higher than the desired WVTR.

L'invention concerne des procédés permettant de produire des films de polyéthylène présentant une vitesse de transmission de la vapeur d'eau (WVTR) satisfaisante. Ces procédés consistent tout d'abord à couler une feuille de polyéthylène comprenant une couche de base d'un polyéthylène et d'un agent de cavitation, ainsi qu'au moins une couche d'une substance permettant de réguler la WVTR, puis à procéder à une orientation biaxiale de ladite feuille de manière à produire un film présentant une WVTR satisfaisante. La couche de base susmentionnée renferme une microstructure poreuse et présente une WVTR sensiblement supérieure à la WVTR que l'on souhaite obtenir.

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