Ethylenic oxygen scavenging compositions and process for...

C - Chemistry – Metallurgy – 08 – F

Patent

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C08F 8/00 (2006.01) B32B 33/00 (2006.01) C08F 8/14 (2006.01) C08K 5/098 (2006.01)

Patent

CA 2144309

Disclosed is a process for transesterifying a polymer having a polyethylenic backbone and pendant ester moieties comprising contacting a melt of the polymer in a reactive extruder with a transesterifying compound so that the polymer undergoes transesterification but not alcoholysis. The transesterified polymer also has pendant ester moieties which differ in kind and/or number from the unreacted polymer. In one embodiment, the process also comprises adding an amount of a transition metal salt that is effective to promote oxygen scavenging. Also in a further embodiment, the process comprises irradiating the transesterified polymer with actinic radiation to reduce the induction period before oxygen scavenging commences. Also disclosed are compositions comprising a component which comprises an ethylenic backbone and a pendant or terminal moiety comprising a benzyl radical are disclosed. The invention also embodies new polyethylenic oxygen scavenging compositions comprising a transition-metal salt and a component which comprises a polyethylenic backbone and a pendant or terminal moiety comprising a benzyl radical. Methods of making the compositions, and methods and compositions using the ethylenic compositions, are disclosed.

L'invention concerne un procédé de transestérification d'un polymère ayant un squelette polyéthylénique et des fractions d'ester pendantes; ce procédé consiste à mettre en contact une fusion du polymère dans une extrudeuse à réaction en utilisant un composé transestérifiant de telle sorte que le polymère subisse une transestérification mais pas une alcoolyse. Le polymère tansestérifié possède aussi des fractions d'ester pendantes mais différentes en nature et/ou en nombre de celles du polymère qui n'a pas subi de réaction. Dans une réalisation, le procédé consiste à ajouter une certaine quantité de sel de métal de transition, efficace pour stimuler l'absorption d'oxygène. Dans une autre réalisation, le procédé consiste à soumettre le polymère transestérifié à une radiation actinique pour réduire la période d'induction avant que ne commence l'absorption de l'oxygène. L'invention porte aussi sur les compositions dont un composant a un squelette polyéthylénique et une fraction d'ester pendante ou terminale à radical benzyle. Elle porte enfin sur les procédés de fabrication de ces compositions, ainsi que sur les méthodes et les compositions faisant intervenir les compositions éthyléniques.

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