Improved process for the production of polyester resins

Details Improved process for the production of polyester resins Improved process for the production of polyester resins

C - Chemistry, Metallurgy

08

G

C08G 63/80 (2006.01) C08G 63/127 (2006.01) C08G 63/88 (2006.01)

Patent

CA 2210205

Process for the crystallization of aromatic polyester resins having IV between 0,5 and 0.7 dl/g wherein the resin is extruded in the form of a strand at extruder exit or the chips obtained by cutting the strand are crystallized maintaining them at temperature between 160~C and 220~C for sufficient time to obtain a crystallized product wherein the DSC curves do not show the presence of practically any premelt peaks.

Méthode pour la cristallisation de résines de polyesters aromatiques, avec un IV se situant entre 0,5 and 0,7 dl/g, où la résine est extrudée sous forme de brin à la sortie de l'extrudeur; le brin peut être coupé en pastilles, qui sont cristallisées en les maintenant à une température se situant entre 160 et 220 degrés C pendant assez longtemps pour obtenir un produit dont les courbes DSC ne comportent pratiquement aucun pic de préfusion.

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