Patent ID: 9120894
Filing Date: 2015-09-01
Classification: C08G

Abstract:
1. A process for the preparation of a polyether carbonate 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) introducing the one or more H-functional starter compounds or a mixture of at least two H-functional starter compounds into a reactor, (β) for activation, adding a part amount (based on the total amount of the amount of alkylene oxides employed in steps (β) and (γ)) of one or more alkylene oxides to the mixture resulting from step (α), optionally carrying out step (β) several times for the activation, (γ) metering continuously one or more alkylene oxides and carbon dioxide into the mixture resulting from step (β) (“copolymerization”), the alkylene oxides employed for the copolymerization being identical to or different from the alkylene oxides employed in step (β), wherein in step (γ) the carbon dioxide is passed into the mixture by