Blends of polyester copolymer and ethylene vinyl acetate...

C - Chemistry – Metallurgy – 08 – L

Patent

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C08L 23/08 (2006.01) C08L 51/06 (2006.01) C08L 67/02 (2006.01)

Patent

CA 2372680

The present invention relates to polymer blends having improved gas barrier properties. The blends are a mixture of polyester copolymers (PETCOPs) and ethylene vinyl acetate (EVA) copolymers that are particularly useful in films requiring gas barrier properties. Bottle liners and closures prepared from the blends described herein have improved gas barrier properties relative to EVA copolymers alone. Films of the present invention may also be useful in a multilayer laminate structure wherein at least one layer comprising a blend of EVA/PETCOP.

L'invention concerne des mélanges de polymères présentant des propriétés d'imperméabilité aux gaz améliorées. Les mélanges sont constitués d'un mélange de copolymères de polyester (PETCOP) et d'éthylène-acétate de vinyle (EVA), qui sont particulièrement utiles dans des films devant présenter des propriétés d'imperméabilité aux gaz. Des joints et des fermetures de bouteilles fabriqués à partir des mélanges de l'invention possèdent des propriétés d'étanchéité aux gaz améliorées par rapport à ceux en copolymères d'EVA. Les films de l'invention peuvent également être utiles dans une structure stratifiée multicouche dans laquelle au moins une couche comprend un mélange d'EVA/PETCOP.

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