abstract |
The present invention relates to a process for the preparation of polyether polyols by addition of alkylene oxides onto H-functional starter compounds, characterized in that at least one urethane-alcohol according to formula (II), in which R 1 means linear or branched C 2 to C 24 -alkylene, which may optionally be interrupted by heteroatoms such as O, S or N and may be substituted, R 2 means linear or branched C 2 to C 24 -alkylene, which may optionally be interrupted by heteroatoms such as O, S or N and may be substituted, R 3 is H, linear or branched C 1 to C 24 alkyl, C 3 to C 24 cycloalkyl, C 4 to C 24 aryl, C 5 to C 24 aralkyl, C 2 to C 24 alkenyl, C 2 to C 24 - alkynyl, each of which may optionally be interrupted by heteroatoms such as O, S or N and / or may each be substituted by alkyl, aryl and / or hydroxyl, is used as H-functional starter compound.n n n Further objects of the invention are the polyether polyols containing a urethane group, the polyether polyols obtainable by the process according to the invention, the use of the polyether polyols according to the invention for the preparation of a polyurethane polymer and the resulting polyurethane polymers. |