Patent ID: 9382417
Filing Date: 2016-07-05
CPC Classification: C08G,C08K,C08L

Claim Text:
1. A process for the preparing 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 catalyst and in the presence of at least one additive A), the process comprising: (α) initially introducing the H-functional starter substance or a mixture of at least two H-functional starter substances into a reaction vessel, the DMC catalyst being added to the H-functional starter substance or the mixture of at least two H-functional starter substances, (β) for the activation, adding a part amount based on the total amount of alkylene oxides employed in the activation and copolymerization of one or more alkylene oxides to the mixture resulting from step (α), optionally in the presence of CO (γ) adding one or more alkylene oxides and carbon dioxide to the mixture resulting from step (β) in a copolymerization, it being possible for the alkylene oxides employed for the copolymerization to be identical to or different from the alkylene oxides employed in the activation, wherein the additive A) is added in step (α) to the H-functional starter substance or the mixture of at least two H-functional starter substances and/or the additive A) is added in step (β) to the part amount of one or more alkylene oxides to the mixture resulting from step (α), and wherein the additive A) is at least one compound chosen from the group consisting of sterically non-hindered phenols according to formula (II) wherein g =1 or 2, and R i represents an amino, bromo, chloro, cyano, fluoro, iodo, methoxy, methyl or nitro group, catechols according to formula (IIIa) and pyrocatechols according to formula (IIIb) wherein g has the above-mentioned meaning and R