Polycarbonate based polyols
US11174348B2 · kind B2 · utility
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7Claims
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Key dates
| Filing date | Nov 9, 2017 |
| Grant date | Nov 16, 2021 |
| Priority date | — |
| Expiry date | Jun 8, 2038 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J2531/0238
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A method of manufacturing a poly(ether-carbonate) polyol comprises a polymerization stage that includes polymerizing carbon dioxide and at least one alkylene oxide, with a starter, in the presence of a double metal cyanide polymerization catalyst and a catalyst promoter that is devoid of halide anions and cyanide. The catalyst promoter is separate from the double metal cyanide polymerization catalyst.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.