Polyether carbonate polyol production method

US9676905B2 · kind B2 · utility

Assignee

• Covestro Deutschland AG · DE

Inventors

• Thomas Ernst Müller · Aachen, DE
• Christoph Gürtler · Cologne, DE
• Jörg Hofmann · Krefeld, DE
• Matthias Wohak · Dormagen, DE
• Stefanie Braun · Cologne, DE
• Aurel Wolf · Wülfrath, DE
• Ilja Peckermann

Key dates

• Filing date: Aug 23, 2013
• Grant date: Jun 13, 2017
• Expiry date: Jan 25, 2034

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G65/2696
• 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 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.