| 摘要 |
<p>A process for preparing a polymer polyol comprising the steps of (a) forming in a first step a dispersant by homopolymerizing a vinyl-terminated adduct, or copolymerizing said adduct with an ethylenically unsaturated monomer or mixture thereof which is not a vinyl-terminated adduct, in the presence of an active hydrogen-containing compound as a solvent under conditions such that the resulting dispersant is soluble in a base polyol, and has a Brookfield viscosity of less than 25,000 centipoises as a 20-35 wt.-% solution in an active hydrogen-containing compound, and (b) polymerizing an ethylenically unsaturated monomer or mixture thereof in the presence of said dispersant and a base polyol under conditions such that the polymerized monomer forms a plurality of particles which are stabilized against agglomeration by the dispersant. The process of this invention provides for improved stability of the dispersed polymer particles in the base polyol, and provides a polymer polyol of surprisingly low viscosity.</p> |
