Patent · US Active

Method for producing polyether carbonate polyols

US10040901B2 · kind B2 · utility

1Cited by

6References

18Claims

0Family size

Assignee

Covestro Deutschland AG · DE

Inventors

Jörg Hofmann · Krefeld, DE
Stefanie Braun · Cologne, DE
Kai Laemmerhold · Aachen, DE
Aurel Wolf · Wülfrath, DE
Michael Traving · Burscheid, DE

Key dates

Filing date	Jun 30, 2015
Grant date	Aug 7, 2018
Priority date	—
Expiry date	Aug 20, 2035

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08G65/2663
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

The invention relates to a method for producing polyether carbonate polyols by binding alkylene oxides and carbon dioxide to one or more H-functional starter substance/s in the presence of a double metal cyanide (DMC) catalyst, characterized in that (y) one or more H-functional starter substance/s and DMC catalyst are continuously metered into the reactor during the binding process, and the free alkylene oxide concentration in the reaction mixture amounts to 1.5 to 5.0 wt %, and the obtained reaction mixture is continuously discharged from the reactor.

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