Process for producing DMC catalysts

US6780813B1 · kind B1 · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Jörg Hofmann · Krefeld, DE
• Bernd Klinksiek · Bensberg, DE
• Stephan Ehlers · West Chester, US
• Thorsten Fechtel · Recklinghausen, DE
• Franz Föhles · Tönisvorst, DE
• Pieter Ooms · Krefeld, DE

Key dates

• Filing date: May 30, 2002
• Grant date: Aug 24, 2004
• Expiry date: May 30, 2022

Classification

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

Abstract

The invention relates to an improved method of producing double-metal cyanide (DMC) catalysts for the production of polyether polyols by polyaddition of alkylene oxides to starter compounds containing active hydrogen atoms, in which the DMC catalyst dispersion is produced using a mixing nozzle, preferably a jet disperser. The DMC catalysts produced in this way have an increased activity in polyether polyol production, reduced particle size and narrower particle size distribution.