Process for polyesters with improved properties

Process for polyesters with improved properties

The present invention relates to a process for producing polyesters displaying exceptionally low acetaldehyde concentrations and good clarity comprising the steps of: polycondensing in the melt phase, a polyester monomer/oligomer mixture under conditions sufficient to form a precursor having in intr...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Hauptverfasser: EKART, MICHAEL PAUL, HATAWAY, JAMES EARL, MURDAUGH, PERRY MICHAEL, POPWELL, GARY WALTON
Format: Patent
Sprache:eng
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
Online-Zugang:Volltext bestellen
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
Beschreibung
Zusammenfassung:The present invention relates to a process for producing polyesters displaying exceptionally low acetaldehyde concentrations and good clarity comprising the steps of: polycondensing in the melt phase, a polyester monomer/oligomer mixture under conditions sufficient to form a precursor having in intrinsic viscosity less than 75% of a possible maximum intrinsic viscosity; and solid stating said precursor under conditions sufficient to increase said intrinsic viscosity at least about 0.05 dl/g.