| abstract |
Polymer polyols are made in a seeded process, in which styrene and acrylonitrile are polymerized in the presence of a base polyol, a seed dispersion, and a solvent. The seed dispersion contains an unsaturated macromer. The process produces a polymer polyol in which the dispersed phase particles have a particle size of 1 to 3 µm and a particle size range of less than 1.25. Polymer polyols are very useful for making flexible polyurethane foam for damping applications where high airflows and good load support are required. |