Method for producing polyether carbonate polyols

摘要

The present invention relates to a method for producing polyether carbonate polyols by way of the catalytic addition of carbon dioxide and alkylene oxides to H-functional starter compounds in the presence of double metal cyanide (DMC) catalyzer that was activated in the presence of cyclic anhydride.

主权项

1. A process for preparing a polyether carbonate polyol by catalytic addition of carbon dioxide and alkylene oxides onto one or more H-functional starter substances in the presence of double metal cyanide (DMC) catalyst, comprising,
initially charging, in a first activation stage, the DMC catalyst and at least one H-functional starter substance and, activating, in a second activation stage, the DMC catalyst by addition of at least one alkylene oxide, CO2 and at least one cyclic anhydride, and, adding, in a third step [polymerization stage], at least one alkylene oxide and CO2.