Patent · US Active

Continuous method for producing an aliphatic polyester

US11401373B2 · kind B2 · utility

0Cited by

2References

17Claims

0Family size

Assignee

BASF SE

Inventors

Maximilian Lehenmeier · Ludwigshafen, DE
Norbert Effen · Lambsheim, DE
Gabriel Skupin · Speyer, DE

Key dates

Filing date	Nov 15, 2018
Grant date	Aug 2, 2022
Priority date	—
Expiry date	Nov 15, 2038

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08G63/90
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

The invention relates to a continuous process for producing an aliphatic polyester constructed from aliphatic dicarboxylic acids and aliphatic diols comprising the steps of a) esterification, b) polycondensation and optionally c) chain extension, characterized in that during step b) in which the polycondenser functions as a degassing apparatus (B) and/or b′) after the polycondensation in an additional degassing apparatus (B′) the crude polyester is degassed 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 water, introduced into the gas space of the degassing apparatus B and/or B′ as an entraining agent.

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