Copolyamide active-passive oxygen barrier resins

B - Operations – Transporting – 65 – D

Patent

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B65D 81/26 (2006.01) B32B 27/08 (2006.01) B32B 27/34 (2006.01) B65D 5/70 (2006.01) B65D 30/08 (2006.01) B65D 30/10 (2006.01) B65D 33/02 (2006.01) B65D 65/40 (2006.01) B65D 77/06 (2006.01) B65D 81/02 (2006.01) B65D 81/24 (2006.01) C08F 8/14 (2006.01) C08F 299/00 (2006.01) C08G 63/46 (2006.01) C08G 63/91 (2006.01) C08G 69/02 (2006.01) C08G 81/02 (2006.01) C08J 5/18 (2006.01) C08K 5/098 (2006.01) C08L 77/00 (2006.01) C09D 5/02 (2006.01) C09D 5/08 (2006.01) C09D 163/00 (2006.01)

Patent

CA 2306038

Compositions for scavenging oxygen are disclosed. These compositions comprise copolyamides comprising over 50 weight percent polyamide segments and an active oxygen scavenging amount of polyolefin oligomer segments. The polyamide segments comprise segments derived from typical bottling and packaging polyamides such as polyhexamethyleneadipamide and polyphthalamides. The copolymers are preferably formed by transesterification during reactive extrusion and typically comprise about 0.5 to about 12 wt.% of polyolefin oligomer segments. The copolyamides provide enhanced active and passive oxygen barrier properties over similar polyester constructions and similar polyamide constructions, when used in a laminar construction. In a series of preferred embodiments, multi-layered bottles fabricated with the oxygen scavenging copolyamides of this invention are about 99.8 wt.% polyamide and suitable for recycle with other polyamide bottles.

L'invention porte sur des compositions de piégeage d'oxygène faites de polyamides comprenant plus de 50 % en poids de segments de polyamide et une quantité active de segments d'oligomères de polyoléfines pour piéger l'oxygène. Les segments de polyamide comprennent des segments dérivant des polyamides utilisés couramment pour des bouteilles et des emballages, telles que des polyhéxaméthylèneadipamide et des polyphthalamides. Lesdits copolymères, de préférence produits par transestérification lors d'une extrusion réactive, comportent normalement d'environ 0,5 à 12 % en poids de segments d'oligomères. Les copolyamides constituent des barrières actives et passives améliorées par rapport aux polyamides similaires lorsqu'on les utilise pour fabriquer des produits laminés. Parmi les réalisations préférées, les bouteilles multicouches fabriquées avec les copolyamides de l'invention, qui comportent 99,8 % en poids de polyamides, peuvent être recyclées avec les autres bouteilles de polyamides.

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