Semi-batch process for making polycarbonate polyols via copolymerization of carbon dioxide and an oxirane
US11566105B2 · kind B2 · utility
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Key dates
| Filing date | Nov 9, 2017 |
| Grant date | Jan 31, 2023 |
| Priority date | — |
| Expiry date | Dec 5, 2039 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J2531/0238
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Polycarbonate polyols are made by copolymerizing carbon dioxide and an alkylene oxide in the presence of a starter compound and a carbonate catalyst. The process is operated in semi-batch mode by combining starter, catalyst and a small amount of alkylene oxide in a reaction vessel, pressurizing the vessel with carbon dioxide, initiating polymerization, and then feeding both carbon dioxide and alkylene oxide to the vessel under polymerization conditions without removal of product until the feeds are completed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.