Melt dispersion process for making polymer polyols
US8822581B2 · kind B2 · utility
1Cited by
8References
9Claims
0Family size
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Key dates
| Filing date | Jun 18, 2009 |
| Grant date | Sep 2, 2014 |
| Priority date | — |
| Expiry date | Feb 4, 2031 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L25/06
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Polystyrene is dispersed into a polyol via a mechanical dispersion process. A stabilizer is present to stabilize the dispersed polymer particles. The stabilizer includes a copolymer of (1) from 10 to 70% by weight of a branched polyol which has a molecular weight of from 4000 to 20,000, from 0.2 to about 1.2 polymerizable ethylenically unsaturated groups per molecule and from about 3 to about 8 hydroxyl groups per molecule with (2) from 30 to 90% by weight of styrene or a mixture of styrene and one or more other low molecular weight monomers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.