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AssigneeCovestro Deutschland AG
InventorsThomas E. Müller, Christoph Gürtler, Muhammad A. Subhani, Burkhard Köhler, Walter Leitner
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The present invention relates to a method for producing higher functional polyether carbonate polyols, said method preferably comprising the steps of ([alpha]) providing a DMC catalyst and; ([alpha][alpha]) a suspending agent that does contain any H-functional groups and/or ([alpha][beta]) an H-functional starter compound ([beta]) adding carbon dioxide and at least one alkylene oxide ([gamma]) adding carbon dioxide and at least two alkylene oxides, wherein these alkylene oxides can be the same as or different from the alkylene oxide or alkylene oxides added in step ([beta]), and ([delta]) adding carbon dioxide and at least one alkylene oxide, wherein this alkylene oxide or these alkylene oxides can be the same as or different from the alkylene oxides added in steps ([beta]) and ([gamma]), at least one of the alkylene oxides in step ([gamma]) having an epoxy functionality of >=2 and, in addition, in the case that no H-functional starter compound is provided in ([alpha]), step ([delta]) includes the addition of an H-functional starter compound.
A process for preparing polyethercarbonate polyols of relatively high functionality comprising reacting at least two alkylene oxides and carbon dioxide with H-functional starter compounds in the presence of a double metal cyanide catalyst, comprising the steps of
Dependencies are inferred from the claim text.