Blends of oxygen scavenging polyamides with polyesters which...

C - Chemistry – Metallurgy – 08 – L

Patent

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Details

C08L 67/02 (2006.01) B29C 45/00 (2006.01) B29D 22/00 (2006.01) C08K 3/08 (2006.01) C08L 77/06 (2006.01)

Patent

CA 2589915

The present invention concerns a method for forming an article by combining a polyester polymer and an oxygen scavenging composition comprising a polyamide in the presence of zinc and a cobalt in a melt processing zone to form a melt; and forming an article such as a sheet or preform from the melt. Also provided are molten formulated polyester polymer compositions containing a blend of a polyethylene terephthalate polymer and a polyamide polymer along with zinc and cobalt. Articles made from the composition are resistant to the transmission of oxygen, possess short induction periods, and have high capacity for sustaining lengthy periods of low oxygen transmission through the wall of the article.

L'invention concerne un procédé de formage d'un article, consistant à combiner un polymère de polyester et une composition désoxygénante comprenant un polyamide, en présence de zinc et de cobalt dans une zone de traitement par fusion, de manière à former une masse fondue, et à former un article, tel qu'une feuille ou une pré-forme à partir de cette masse fondue. L'invention concerne en outre des compositions polymères de polyester formulées fondues contenant un mélange d'un polymère de polyéthylène téréphtalate et d'un polymère polyamide, en même temps que de zinc et de cobalt. Des articles fabriqués à partir de cette composition sont résistants à la transmission d'oxygène, possèdent de brèves périodes d'induction et présentent une capacité élevée pour supporter de longues périodes à faible transmission d'oxygène à travers la paroi de l'article.

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