Process for the preparation of polyether polyols

US6776925B2 · kind B2 · utility

Assignees

• BAYER HEALTHCARE LLC · DE
• Bayer Polymers LLC · US

Inventors

• Jörg Hofmann · Krefeld, DE
• Stephan Ehlers · West Chester, US
• Bernd Klinksiek · Bensberg, DE
• Lars Obendorf
• Christian Steinlein · Ratingen, DE
• Bert Klesczewski · Neunburg vorm Wald, DE
• Jose F. Pazos · Havertown, US

Key dates

• Filing date: Feb 19, 2002
• Grant date: Aug 17, 2004
• Expiry date: Sep 13, 2022

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G65/2663
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention relates to a process for the production of polyether polyols by polyaddition of alkylene oxides onto starter compounds containing active hydrogen atoms conducted in the presence of a double-metal cyanide catalyst wherein a reaction mixture is guided at least once through a zone which has an energy density of at least 105 J/m3 and wherein the residence time of the reaction mixture in this zone is at least 10−6 seconds per pass.