| abstract |
The present invention relates to a process for the preparation of polyethercarbonate polyols, wherein (I) in a first step from one or more H-functional starter substances, from one or more alkylene oxides and carbon dioxide in the presence of at least one DMC catalyst, a polyethercarbonate polyol is prepared, and (ii) in a second step, the polyethercarbonate polyol is chain extended with a mixture of at least two different alkylene oxides in the presence of at least one DMC catalyst.n n n Articles of the invention are also polyether carbonate polyols containing a terminal mixing block of at least two alkylene oxides, and a process for the production of flexible polyurethane foams, wherein a polyol component is used which contains a polyethercarbonate polyol according to the invention. |