Polyether carbonate polyol production method

US9273183B2 · kind B2 · utility

Assignee

• Covestro Deutschland AG · DE

Inventors

• Thomas Ernst Müller · Aachen, DE
• Christoph Gürtler · Cologne, DE
• Matthias Wohak · Dormagen, DE
• Jörg Hofmann · Krefeld, DE
• Muhammad Afzal Subhani · Aachen, DE
• Walter Leitner · Aachen, DE
• Ilja Peckermann
• Aurel Wolf · Wülfrath, DE

Key dates

• Filing date: Aug 23, 2013
• Grant date: Mar 1, 2016
• Expiry date: Aug 23, 2033

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G18/4833
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The invention relates to a method for producing polyether carbonate polyols by attaching alkylene oxides and carbon dioxide to one or more H-functional starters in the presence of a double-metal cyanide catalyst, characterized in that (alpha) a suspending agent which contains no H-functional groups and is selected from among one or more compounds from the group consisting of aliphatic lactones, aromatic lactones, lactides, cyclic carbonates comprising at least three optionally substituted methylene groups between the oxygen atoms of the carbonate group, aliphatic cyclic anhydrides, and aromatic cyclic anhydrides, is provided in a reactor; (ss) optionally, a moiety of alkylene oxide is added to the mixture from step (alpha) at temperatures of 90 to 150 DEG C., and the addition of the alkylene oxide compound is then interrupted; and (gamma) one or more H-functional starters are continuously metered into the reactor during the reaction.