C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
C08L 67/04 (2006.01) B29C 35/02 (2006.01) B29C 71/02 (2006.01) C08G 63/88 (2006.01) C08K 5/00 (2006.01)
Patent
CA 2163443
A process for improving mechanical properties of an aged polyester composition comprising at least one polyhydroxyalkanoate (PHA) and at least one plasticiser thereof, which comprises heating at a temperature whereby (i) the polyester is restored to its original non-aged properties, and (ii) subsequent ageing of the polyester is retarded as indicated by substantial improvement of at least one measurement indicative of ageing compared to non heat treated polyester of the same age. The invention includes a polyester composition and shaped articles which have been subjected to the process and in which ageing is retarded.
L'invention concerne un procédé d'amélioration des propriétés mécaniques d'une composition de polyester vieilli comprenant au moins un polyhydroxyalcanoate (PHA) et au moins un plastifiant de celui-ci, ce procédé consistant à chauffer à une température à laquelle (i) on redonne au polyester ses propriétés d'origine non vieillies et (ii) on retarde le vieillissement ultérieur du polyester telle que l'indique une amélioration importante d'au moins une mesure indicatrice du vieillissement comparativement à un polyester du même âge non traité à chaud. L'invention comprend une composition de polyester, et des articles façonnés qui ont été soumis à ce processus, et dont on retarde le vieillissement.
Liggat John Jamieson
O'brien Gregory
Monsanto Company
Smart & Biggar
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