Enhanced oxygen barrier performance from modification of...

C - Chemistry – Metallurgy – 08 – F

Patent

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C08F 8/00 (2006.01) A22C 13/00 (2006.01)

Patent

CA 2408882

Herein is disclosed a modified ethylene vinyl alcohol polymer (EVOH) comprising an oxygen scavenging functional group. Preferably, the modified EVOH comprises structures IV, V, and VI: (see formula IV), (see formula V), (see formula VI), wherein x in an integer greater than or equal to 1, y is an integer greater than or equal to 1, z is an integer greater than or equal to 1, and R comprises a cycloalkenyl group. The modified EVOH is useful in oxygen barrier applications, such as a forming an oxygen barrier layer of a packaging article. Also disclosed are methods of modifying ethylene vinyl alcohol polymers, and using the modified EVOH to make packaging articles with a superior barrier to entry by atmospheric oxygen.

L'invention concerne un polymère d'éthylène vinyle alcool (EVOH) modifié, comprenant un groupe fonctionnel désoxygénant. De préférence, cet EVOH comprend les structures (IV), (V) et (VI), dans lesquelles x représente un entier supérieur ou égal à 1, y représente un entier supérieur ou égal à 1, z représente un entier supérieur ou égal à 1, et R comprend un groupe cycloalcényle. Cet EVOH modifié est utile dans des applications destinées à conférer une barrière à l'oxygène à un article d'emballage. L'invention concerne également des méthodes permettant de modifier ces polymères d'éthylène vinyle alcool et d'utiliser cet EVOH modifié pour produire des articles d'emballage présentant une meilleure barrière contre l'entrée d'oxygène de l'air.

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