Polyester polymer and copolymer compositions containing...

C - Chemistry – Metallurgy – 08 – K

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C08K 3/00 (2006.01) B29C 49/02 (2006.01)

Patent

CA 2576285

Polyester compositions are disclosed that include polyester polymers or copolymers having incorporated therein metallic nickel particles that improve the reheat properties of the compositions. Processes for making such compositions are also disclosed. The nickel particles may be incorporated in the polyester by melt compounding, or may be added at any stage of the polymerization, such as during the melt-phase of the polymerization. A range of particle sizes may be used, as well as a range of particle size distributions. The polyester compositions are suitable for use in packaging made from processes in which a reheat step is desirable.

L'invention concerne des compositions polyesters comprenant des copolymère ou des polymères polyesters contenant des particules de nickel métallique qui améliorent les propriétés au réchauffage desdites compositions. Des procédés de fabrication de ces compositions sont également décrits. Les particules de nickel peuvent être incorporées dans le polyester par compoundage par fusion ou peuvent être ajoutées à n'importe quel stade de la polymérisation, par exemple pendant la phase de fusion de la polymérisation. Une gamme de tailles de particules peut être utilisée ainsi qu'une gamme de répartitions granulométriques. Les compositions polyesters de l'invention sont appropriées dans les emballages fabriqués par des procédés dans lesquels une étape de réchauffage est nécessaire.

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