Formation of polymer polyols with a narrow polydispersity using double metal cyanide (DMC) catalysts

US6713599B1 · kind B1 · utility

Assignee

• BASF SE

Inventors

• Werner Hinz · Bischofswerda, DE
• Jacob Wildeson · Chambersburg, US
• Edward M. Dexheimer · Grosse Ile Township, US
• Raymond A. Neff · Bloomfield Hills, US

Key dates

• Filing date: Mar 31, 2003
• Grant date: Mar 30, 2004
• Expiry date: Mar 31, 2023

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G65/2696
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A method of forming a polyol includes the steps of reacting an initiator with an alkylene oxide, and optionally carbon dioxide, in the presence of a double metal cyanide catalyst and a sterically hindered chain transfer agent capable of protonating the growing polyol polymer. The presence of the chain transfer agent reduces the polydispersity of the resultant polyol.