| abstract |
(57) [Summary] [PROBLEMS] To provide a method for producing a polymer polyol having a low viscosity and good dispersion stability, and a polyurethane foam having a low closed cell property, which is obtained by using the method. [Structure] An ethylenically unsaturated monomer is polymerized in a polyol to obtain a polymer polyol having a relatively low polymer concentration, and then the ethylenically unsaturated monomer is polymerized in a mixture of the polymer polyol and the polyol. |