| 摘要 |
<p>The invention relates to crystallising polyether polyols which can be produced by first reacting propylene oxide and polyhydroxy compounds in the presence of an alkoxy compound containing zinc and/or aluminium atoms, in order to obtain a crystallising polyether polyol with an average molecular weight Mn of 500 to 5000, and then reacting the crystallising polyether polyol thus obtained with 10 to 90 wt. % of an epoxide in relation to the quantity of the crystallising polyol, in the presence of a catalyst that does not polymerise propylene oxide stereospecifically, in order to obtain a crystallising polyether polyol with an average molecular weight Mn of 1000 to 20 000. The invention also relates to a method for producing the crystallising polyether polyols and to their use for producing polyurethane materials, especially polyurethane foams, elastomers and coatings.</p> |
