LATE ADDITION OF SUPPLEMENTAL ETHYLENE GLYCOL IN THE PREPARATION OF COPOLYESTERS

The application is directed to a method for making copolyesters of terephthalic acid and a diol component including ethylene glycol and includes the steps of adding teraphthalic acid and diol to a first esterification reactor and then late addition of supplemental ethylene glycol subsequent to the f...

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Bibliographische Detailangaben
Hauptverfasser:	GREENE, CAROL, JULLIARD, JERNIGAN, MARY, THERESE, WINDES, LARRY, CATES
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	CHEMISTRY COMPOSITIONS BASED THEREON MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-UP
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Beschreibung
Zusammenfassung:	The application is directed to a method for making copolyesters of terephthalic acid and a diol component including ethylene glycol and includes the steps of adding teraphthalic acid and diol to a first esterification reactor and then late addition of supplemental ethylene glycol subsequent to the first esterification reactor but prior to a point where the ethylene glycol partial pressure is reduced below about 300 torr. Cette invention a trait à un procédé de fabrication de copolyesters à partir d'acide téréphtalique et d'un composant diol comportant de l'éthylène glycol. Ce procédé repose sur un apport d'acide téréphtalique et de diol dans un premier réacteur d'estérification puis sur une adjonction tardive d'éthylène glycol supplémentaire dans ce premier réacteur d'estérification, mais avant que la pression partielle de l'éthylène glycol ne soit descendue sous un seuil de 300 torr environ.