Method for producing polyether polyols

US9120894B2 · kind B2 · utility

Assignee

• Bayer Intellectual Property GmbH · DE

Inventors

• Thomas Ernst Müller · Aachen, DE
• Christoph Gürtler · Cologne, DE
• Matthias Wohak · Dormagen, DE
• Jörg Hofmann · Krefeld, DE
• Muhammad Afzal Subhani · Aachen, DE
• Maurice Cosemans · Heinsberg, DE
• Walter Leitner · Aachen, DE

Key dates

• Filing date: Jul 17, 2012
• Grant date: Sep 1, 2015
• Expiry date: Jul 17, 2032

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G65/2603
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention relates to a process for the preparation of polyether carbonate polyols from one or more H-functional starter compounds, one or more alkylene oxides and carbon dioxide in the presence of a double metal cyanide catalyst, wherein (α) the H-functional starter substance or a mixture of at least two H-functional starter substances is initially introduced into the reaction vessel, (β) for the activation, a part amount (based on the total amount of the amount of alkylene oxides employed in steps (β) and (γ)) of one or more alkylene oxides is added to the mixture resulting from step (α), it also being possible for step (β) to be carried out several times for the activation, (γ) one or more alkylene oxides and carbon dioxide are metered continuously into the mixture resulting from step (β) (“copolymerization”), the alkylene oxides employed for the copolymerization being identical to or different from the alkylene oxides employed in step (β), characterized in that in step (γ) the carbon dioxide is passed into the mixture by (i) gassing the reaction mixture in the reactor from the bottom, (ii) using a hollow shaft stirrer, (iii) a combination of the metering operations a…