Patent · US Active

Method for purifying an aliphatic polyester

US11319407B2 · kind B2 · utility

0Cited by

0References

13Claims

0Family size

Assignee

BASF SE

Inventors

Maximilian Lehenmeier · Ludwigshafen, DE
Norbert Effen · Lambsheim, DE
Gabriel Skupin · Speyer, DE
Rainer Naef · Dietikon, CH

Key dates

Filing date	Nov 15, 2018
Grant date	May 3, 2022
Priority date	—
Expiry date	Dec 15, 2038

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08G63/16
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

The present invention relates to a continuous process for purifying a chain-extended aliphatic polyester constructed from aliphatic dicarboxylic acids and aliphatic diols in a degassing apparatus, wherein the crude polyester is degassed for 3 to 30 minutes at a pressure of 0.01 to 5 mbar in the presence of 1% to 7% by weight, based on the total weight of the crude polyester, of an entraining agent.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.