Patent ID: 9080010
Filing Date: 2015-07-14
Classification: C08G

Abstract:
1. A process for 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 metal salt, comprising (α) placing the double metal cyanide catalyst, the metal salt and the H-functional starter substance, or a mixture of at least two H-functional starter substances, in a reaction vessel, (β) for activation (β1) in a first activation step, adding a first partial amount (based on the total amount of the amount of alkylene oxides used in the activation and copolymerisation) of one or more alkylene oxides to the mixture resulting from step (a), wherein this addition of the partial amount of alkylene oxide can optionally take place in the presence of CO (β2) in a second activation step, after the temperature peak reached in the preceding activation step, adding a second partial amount (based on the total amount of the amount of alkylene oxides used in the activation and copolymerisation) of one or more alkylene oxides to the mixture resulting from the preceding activation step, wherein this addition of the partial amount of alkylene oxide can optionally take place in the presence of CO (γ) adding one or more alkylene oxides and carbon dioxide to the mixture resulting from step (β) (“copolymerisation”), wherein the metal salt comprises at least one compound selected from the group consisting of alkaline earth halides, alkaline earth carboxylates and aluminium carboxylates, and wherein the amount of the metal salt is from 0.2 to 10.0 [mmol metal salt]/[mmol Co] or wherein the metal salt comprises magnesium halide in an amount of from 0.8 to 4.0 [mmol metal salt]/[mmol Co], alkaline earth carboxylate and/or aluminium carboxylate.