Polyester polymer and copolymer compositions containing...

C - Chemistry – Metallurgy – 08 – K

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C08K 3/08 (2006.01)

Patent

CA 2577020

Polyester compositions are disclosed that are suitable for molding, and that include polyester polymers or copolymers having incorporated therein metallic tungsten particles that improve the reheat properties of the compositions. Processes for making such compositions are also disclosed. The tungsten 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 molding, and for use in packaging made from processes in which a reheat step is desirable.

L'invention concerne des compositions de polyester convenant au moulage, lesquelles compositions contiennent des polymères ou copolymères de polyester auxquels sont incorporées des particules métalliques de tungstène améliorant les propriétés de réchauffement desdites compositions. Cette invention concerne également des procédés de production desdites compositions. Les particules de tungstène peuvent être incorporées au polyester par mélangeage à l'état fondu ou peuvent être ajoutées à n'importe quelle étape de la polymérisation, p. ex. pendant la phase de fusion de la polymérisation. Une gamme de tailles de particules peut être utilisée, tout comme une gamme de distributions de tailles de particules. Ces compositions de polyester conviennent au moulage et à une utilisation dans des emballages fabriqués par des procédés dans lesquels une étape de réchauffement est souhaitable.

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