Polyester polymer and copolymer compositions containing...

C - Chemistry – Metallurgy – 08 – K

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C08K 3/14 (2006.01) C08K 3/28 (2006.01) C08K 3/38 (2006.01) C08L 67/00 (2006.01)

Patent

CA 2600355

Polyester compositions are disclosed that include polyester polymers or copolymers having incorporated therein particles of one or more transition metal compounds that improve the reheat properties of the compositions. The transition metal compounds are binary compounds of a transition metal element selected from titanium, vanadium, zirconium, niobium, hafnium, and tantalum, and a non-metallic element selected from boron, carbon, and nitrogen. Processes for making such polyester compositions are also disclosed. The 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.

La présente invention propose des compositions de polyester qui incluent des polymères ou des copolymères de polyester dans lesquels sont incorporées des particules d'un ou de plusieurs composés de métaux de transition qui améliorent les propriétés de tenue au réchauffage des compositions. Les composés de métaux de transition sont des composés binaires comprenant un métal de transition choisi parmi le titane, le vanadium, le zirconium, le niobium, le hafnium et le tantale et un élément non métallique choisi parmi le bore, le carbone et l'azote. Les procédés de fabrication de telles compositions de polyester sont eux aussi divulgués. Les particules peuvent être incorporées dans le polyester par mélangeage à l'état fondu ou elles peuvent être ajoutées à un stade quelconque de la polymérisation, tel que la phase de fusion de la polymérisation. On peut utiliser un éventail de tailles de particules de même qu'un éventail de distributions des tailles des particules. Les compositions de polyester peuvent être utilisées dans des emballages fabriqués par des procédés dans lesquels une étape de réchauffage est souhaitable.

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