Multilayer packaging barrier films comprising ethylene vinyl...

B - Operations – Transporting – 32 – B

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B32B 27/00 (2006.01) B32B 27/34 (2006.01)

Patent

CA 2589758

Compositions and packaging films are provided having a multilayer oxygen barrier comprising an EVOH copolymer layer in contact with at least one polyamide layer. The EVOH copolymer compositions preferably comprise about 44mol%, or less, of ethylene. Multilayer packaging films can optionally include an exterior layer comprising heat resistant materials such as polyester or polyamide. The multilayer oxygen barriers described herein can provide high shrink films with desirably high oxygen barrier properties. The oxygen barriers can be used in making heat-shrinkable films and food packages having desirable high levels of free shrink.

L'invention concerne des compositions et des films d'emballage possédant une barrière d'oxygène multicouches qui comprend une couche de copolymère EVOH, en contact avec au moins une couche de polyamide. Les compositions de copolymère EVOH comprennent de préférence environ 44 mol %, ou moins, d'éthylène. Les films d'emballage multicouches peuvent éventuellement comprendre une couche extérieure comprenant des matériaux thermorésistants tels que le polyester ou le polyamide. Les barrières d'oxygène multicouches décrites dans l'invention permettent de former des films à retrait élevé avec des propriétés barrières d'oxygène élevées désirables. Les barrières d'oxygène peuvent s'utiliser dans la fabrication de films à retrait élevé et des emballages alimentaires ayant un degré de retrait élevé par rapport à l'état libre.

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