Patent ID: 9249259
Filing Date: 2016-02-02
CPC Classification: C08G

Claim Text:
1. A process for the preparation of a polyethercarbonate polyol from one or more H-functional starter compounds, one or more alkylene oxides and carbon dioxide in the presence of a double metal cyanide (DMC) catalyst, comprising (α) (α1) placing the DMC catalyst and one or more H-functional starter compounds in a reactor, (β) adding, under an atmosphere of inert gas/carbon dioxide mixture or under a carbon dioxide atmosphere, a fraction based on the total amount of alkylene oxides used in steps (β) and (γ), one or more alkylene oxides to the mixture from step (α) at temperatures of 50 to 200° C., and (γ) metering one or more alkylene oxides and carbon dioxide into a mixture resulting from step (β).