Process making polymer polyol having monodisperse dispersed polymer particles
US10975215B2 · kind B2 · utility
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Key dates
| Filing date | Mar 21, 2017 |
| Grant date | Apr 13, 2021 |
| Priority date | — |
| Expiry date | Oct 12, 2037 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2375/08
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
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 span of less than 1.25. The polymer polyols are very useful for making flexible polyurethane foam for cushioning applications, in which high airflows and good load bearing are needed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.