Polymer polyol compositions containing a grafted polyacrylate polyol dispersant

摘要

A polymer polyol composition useful for the preparation of polyurethanes, particularly polyurethane foams and comprising a continuous phase, a disperse phase within the continuous phase and, as a dispersant to enhance the stability of the polymer polyol, a grafted polyol-polyacrylate dispersant comprising an isocyanate vinyl monomer/ethylenically unsaturated monomer random copolymer and a polyoxyalkylene polyether which are connected through at least one urethane graft site. Methods of preparing the polymer polyol composition and the grafted polyololyacraylate are also provided having a low viscosity as well as high stability and may be prepared with high levels of dispersed vinyl ploymer and high styrene;acrylonitrile ratios in the dispersed vinyl polymer.