Oxygen scavenging structures having organic oxygen...

B - Operations – Transporting – 32 – B

Patent

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B32B 27/18 (2006.01) B65D 81/24 (2006.01)

Patent

CA 2199366

Disclosed is a composition comprising a layer carrying an organic oxygen scavenging material and a polymeric selective barrier layer. The polymeric selective barrier layer permits oxygen to migrate from the packaged volume to the organic oxygen scavenging material, and the polymeric selective barrier layer blocks migration of compounds created during oxidation of the organic oxygen scavenging material from the layer carrying the organic oxygen scavenging material to the interior of the package in which the composition of this invention is incorporated. In one embodiment, the polymeric selective barrier layer has a glass transition temperature greater than about 5 ~C above the use temperature of the package in which the composition of this invention is incorporated. In another embodiment, the polymeric selective barrier layer has a glass transition temperature greater than about 40 ~C. In yet another embodiment, the polymeric selective barrier layer is an oriented polymer. In a further embodiment, the layer carrying the organic oxygen scavenging material is a polymer having oxidizable sites in the polymer and containing a transition metal salt catalyst.

L'invention concerne une composition possédant une couche portant un matériau organique absorbeur d'oxygène, ainsi qu'une couche constituant une barrière polymère sélective. Cette couche barrière permet à l'oxygène de migrer depuis le volume conditionné vers le matériau organique absorbeur d'oxygène et bloque la migration des composés créés pendant l'oxydation dudit matériau depuis la couche portant ledit matériau vers l'intérieur de l'emballage dans lequel est incorporée ladite composition. Dans un mode de réalisation, la couche barrière polymère sélective possède un température de transition vitreuse supérieure de 5 ~C environ à la température d'utilisation de l'emballage contenant ladite composition. Dans un autre mode de réalisation, la couche barrière possède une température de transition vitreuse supérieure à 40 ~C environ. Dans un autre mode de réalisation, la couche barrière polymère sélective est un polymère orienté. Dans encore un autre mode de réalisation, la couche portant le matériau organique absorbeur d'oxygène est un polymère contenant des zones oxydables, ainsi qu'un catalyseur à sel de métal de transition.

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