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1. (WO1998049217) PROCESS FOR THE PREPARATION OF POLYESTERS

Pub. No.:    WO/1998/049217    International Application No.:    PCT/US1998/008948
Publication Date: Fri Nov 06 00:59:59 CET 1998 International Filing Date: Sat May 02 01:59:59 CEST 1998
IPC: C08G 63/80
Applicants: EASTMAN CHEMICAL COMPANY
Inventors: EKART, Michael, Paul
HATAWAY, James, Earl
MURDAUGH, Perry, Michael
POPWELL, Gary, Walton
Title: PROCESS FOR THE PREPARATION OF POLYESTERS
Abstract:
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 an 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.