Improved wvtr film using wax in combination with a cavitated...

B - Operations – Transporting – 32 – B

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B32B 3/26 (2006.01) B29C 55/02 (2006.01) B32B 27/32 (2006.01) B29C 47/00 (2006.01)

Patent

CA 2294512

A multilayer film having enhanced barrier properties with respect to oxygen and water vapor transmission is provided. The multilayer film includes a polyolefin core layer, a copolymer or terpolymer intermediate layer on at least one surface of the polyolefin core layer, with the intermediate layer having voids therein and including a wax trapped within the voids, and a surface layer on the intermediate layer. Multilayer films according to the present invention are particularly useful as packaging films for food products, and are successful in laminating, printing or coating operations.

L'invention concerne un film multicouches présentant des propriétés de protection améliorées, notamment contre la pénétration de vapeur d'oxygène et d'eau. Ce film multicouches est constitué: d'une couche centrale de polyoléfine; d'une couche intermédiaire de copolymère ou de terpolymère, placée sur au moins l'une des surfaces de ladite couche centrale de polyoléfine, cette couche intermédiaire présentant des vides dans lesquels une cire a été insérée; et d'une couche superficielle, placée sur ladite couche intermédiaire. Les films multicouches fabriqués selon la présente invention sont particulièrement utiles en tant que films d'emballage pour des produits alimentaires, et dans des opérations de stratification, d'impression, ou d'enduisage.

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