Alkylene oxide polymerization using a double metal cyanide catalyst complex and a magnesium, Group 3-Group 15 metal or lanthanide series metal compound
US9040657B2 · kind B2 · utility
15Cited by
7References
15Claims
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Key dates
| Filing date | Dec 18, 2011 |
| Grant date | May 26, 2015 |
| Priority date | — |
| Expiry date | Dec 26, 2031 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G65/34
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Alkylene oxide polymerizations are performed in the presence of a double metal cyanide polymerization catalyst and certain magnesium, Group 3-Group 15 metal or lanthanide series metal compounds. The presence of the magnesium, Group 3-Group 15 metal or lanthanide series metal compound provides several benefits including more rapid catalyst activation, faster polymerization rates and the reduction in the amount of ultra high molecular weight polymers that are formed. The catalyst mixture is unexpectedly useful in making polyethers having low equivalent weights.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.