Patent · US Active

Process for purifying an aliphatic-aromatic polyester

US12371529B2 · kind B2 · utility

0Cited by

3References

13Claims

0Family size

Assignee

BASF SE

Inventors

Timo Benjamin WITT · Ludwigshafen am Rhein, DE
Norbert Effen · Lambsheim, DE
Jerome Lohmann · Landau, DE
Motonori Yamamoto · Mannheim, DE
Andreas Kuenkel · Neustadt, DE

Key dates

Filing date	May 19, 2020
Grant date	Jul 29, 2025
Priority date	—
Expiry date	Nov 26, 2041

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08G63/80
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

The present invention relates to a continuous process for purifying an aliphatic-aromatic polyester constructed from aliphatic dicarboxylic acids, aromatic 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.