Oxygen absorbent films and structures comprising same

Details Oxygen absorbent films and structures comprising same Oxygen absorbent films and structures comprising same

C - Chemistry, Metallurgy

08

J

C08J 5/18 (2006.01) C08L 23/08 (2006.01) C09K 15/08 (2006.01)

Patent

CA 2408873

The invention concerns a film comprising ethylene copolymers and an unsaturated epoxy and comprising quinones and carboxylic acids grafted on said polymers. The grafted acids supply hydroxyl functions, proton donors, enabling transformation of the quinones into hydroquinones The quinones are reduced (activation) into hydroquinones to become oxygen absorbents The invention also concerns structures comprising at least an oxygen-barrier film and at least said film. The invention further concerns a package comprising said structure and wherein, starting from inside the package outwards, there are first the oxygen absorbent film and then the oxygen barrier film.

La présente invention concerne un film comprenant des copolymères de l'éthylène et d'un époxyde insaturé et comprenant des quinones et des acides carboxyliques greffés sur ces copolymères. Les acides greffés fournissent des fonctions hydroxyles, donneurs de protons, permettant la transformation des quinones en hydroquinones. Les quinones sont réduites (activation) en hydroquinones pour devenir des absorbeurs d'oxygène. La présente invention concerne aussi des structures comprenant au moins un film barrière à l'oxygène et au moins le film précédent. La présente invention concerne aussi un emballage comprenant la structure précédente et dans lequel, en partant de l'intérieur de l'emballage et en allant vers l'extérieur, on trouve d'abord le film absorbeur d'oxygène puis le film barrière à l'oxygène.

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