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) C08L 67/04 (2006.01)
Patent
CA 2163552
Method of retarding age embrittlement of polyester comprising heat treating the polyester after preparation by cooling below 90 °C and then heating at 90 °C to 160 °C within 24 hours of preparation, and a polyester composition in which ageing is substantially retarded compared to the non-heat treated polyester. The invention encompasses the polyester composition which has been subjectod to the method.
Procédé permettant de retarder la fragilisation par le vieillissement, consistant à soumettre le polyester, dans les 24 heures suivant sa préparation, à un traitement thermique comprenant le refroidissement à une température inférieure à 90 DEG C, suivi du chauffage à une température comprise entre 90 DEG C et 160 DEG C. L'invention se rapporte également à une composition de polyester dans laquelle le vieillissement est sensiblement retardé par rapport au polyester n'ayant pas subi le traitement thermique. L'invention concerne la composition de polyester soumise à ce procédé.
Liggat John Jamieson
O'brien Gregory
Monsanto Company
Smart & Biggar
LandOfFree
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