| abstract |
The invention relates to a method for producing polyether polyols comprising terminal primary hydroxyl groups. Said method includes the steps of reacting a starter compound containing active hydrogen atoms with an epoxide using double metal cyanide catalysis, reacting the obtained product with a cyclic carboxylic acid anhydride, and reacting said obtained product with ethylene oxide in the presence of a catalyst containing at least one nitrogen atom per molecule, with the exclusion of non-cyclic, identically substituted tertiary amines. The invention further relates to polyether polyols obtained using said method, compositions containing said polyols, and polyurethane polymers based on said polyols. |