LOW-VISCOSITY POLYMER POLYOLS, A PROCESS FOR THEIR PRODUCTION, AND THEIR USE FOR THE PRODUCTION OF POLYURETHANE PLASTIC FOAMS

摘要

A process is described for the production of stable agglomeratefree low-viscosity polymer polyols by free-radical polymerization of ethylenically unsaturated monomers, such as styrene and/or acrylonitrile, with polyol compounds. This process requires that prior to the start of the free-radical polymerization, an olefinically unsaturated compound which is capable of reacting with primary hydroxyl groups is added to a base polyol which contains at least 2 wt-% of a polyol containing primary hydroxyl end groups, and then, the free-radical polymerization is carried out. Suitable olefinically unsaturated compounds include unsaturated cyclic or acyclic anhydrides, unsaturated acid chlorides and/or unsaturated epoxides. Also, a process for the production of polyurethane plastics from the polyisocyanate polyaddition process is described wherein the isocyanate-reactive component comprises the polymer polyols produced from the above described process.