C - Chemistry – Metallurgy – 08 – K
Patent
C - Chemistry, Metallurgy
08
K
C08K 9/02 (2006.01) B29C 49/00 (2006.01) B65D 1/02 (2006.01)
Patent
CA 2621976
Polyester compositions are disclosed that include polyester polymers or copolymers having incorporated therein carbon-coated iron particles that improve the reheat properties of the compositions. Processes for making such compositions are also disclosed. The carbon-coated iron 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 de polyester comprenant des polymères ou des copolymères de polyester renfermant des particules de fer revêtu de carbone qui améliorent les propriétés de réchauffage de ces compositions. L'invention concerne également des processus de fabrication de ces compositions. Lesdites particules de fer revêtu de carbone peuvent être incorporées dans le polyester par mélange par fusion, ou ajoutées à n'importe quel stade de la polymérisation, par exemple, lors de la phase de fusion de la polymérisation. On peut utiliser une gamme de dimensions granulométriques, ainsi que des distributions granulométriques. L'utilisation de ces compositions est appropriée dans les emballages obtenus par des procédés dans lesquels l'étape de réchauffage est recommandée.
Weinhold Stephen
White Alan Wayne
Xia Zhiyong
Eastman Chemical Company
Gowling Lafleur Henderson Llp
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