B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
B29C 35/02 (2006.01) B29C 71/02 (2006.01) C08G 63/06 (2006.01) C08G 63/88 (2006.01)
Patent
CA 2163553
Process for improving mechanical properties of an aged polyester composition consisting essentially of copolymer of hydroxybutyrate units and hydroxyvalerate units which comprises heating the polyester 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 the 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 d'une composition de polyester vieilli se composant essentiellement du copolymère des unités d'hydroxybutyrate et des unités d'hydroxyvalérate, et qui consiste à chauffer le polyester à une température à laquelle (i) on redonne au polyester ses propriétés d'origine non vieillies, et (ii) à laquelle on retarde le vieilissement du polyester, tel que l'indique une amélioration importante d'au moins une mesure indicatrice du vieilissement comparativement à un polyester du même age non traité à chaud. L'invention comprend la composition de polyester, et les articles façonnés qui ont été soumis à ce procédé, et dont on retarde le vieillissement.
Liggat John Jamieson
O'brien Gregory
Monsanto Company
Smart & Biggar
LandOfFree
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