Use of alcohols containing at least two urethane groups for preparation of polyether polyols

Abstract

The present invention relates to a process for preparing polyether polyols by adding alkylene oxides onto H-functional starter compounds, characterized in that at least one alcohol containing at least two urethane groups is used as H-functional starter compound. The invention further provides the polyether polyols containing a structural unit of the formula (IV) where Ris linear or branched Cto C-alkylene which may optionally be interrupted by heteroatoms such as O, S or N and may be substituted, preferably CH—CHor CH—CH(CH), Ris linear or branched Cto C-alkylene, Cto C-cycloalkylene, Cto C-arylene, Cto C-aralkylene, Cto C-alkenylene, Cto C-alkynylene, each of which may optionally by interrupted by heteroatoms such as O, S or N and/or may each be substituted by alkyl, aryl and/or hydroxyl, preferably Cto CM alkylene, Ris H, linear or branched Cto C-alkyl, Cto C-cycloalkyl, Cto C-aryl, Cto C-aralkyl, Cto C-alkenyl, Cto C-alkynyl, each of which may optionally be interrupted by heteroatoms such as O, S or N and/or each of which may be substituted by alkyl, aryl and/or hydroxyl, preferably H, R, is H, linear or branched O to C-alkyl, C-cycloalkyl, Cto C-aryl, Cto C-aralkyl, Cto C-alkenyl, Cto C-alkynyl, each of which may be interrupted by heteroatoms such as O, S or N and/or each of which may be substituted by alkyl, aryl and/or hydroxyl, preferably H, IV is linear or branched Cto C-alkylene which may optionally be interrupted by heteroatoms such as O, S or N and may be substituted, preferably CH—CHor CH—CH(CH), and where Rto Rmay be identical or different from one another, and the polyether polyols obtainable by the process according to the invention.