Patent ID: 9309356
Filing Date: 2016-04-12
CPC Classification: C08G

Claim Text:
1. A process for the preparation of a polyether carbonate polyol from one or more H-functional starter substances, one or more alkylene oxides and carbon dioxide in the presence of a double metal cyanide (DMC) catalyst, comprising (α) mixing, under an inert gas atmosphere, under an atmosphere of an inert gas/carbon dioxide mixture or under a pure carbon dioxide atmosphere, at temperatures of from 90 to 150° C., the DMC catalyst with a heterocumulene and one or more H-functional starter substance, (β) adding alkylene oxide at temperatures of from 100 to 150° C. to the mixture from step (α) under an inert gas atmosphere, under an atmosphere of an inert gas/carbon dioxide mixture or under a pure carbon dioxide atmosphere, and (γ) metering continuously one or more alkylene oxides and carbon dioxide into the mixture resulting from step (β).