Purification of polyols prepared using double metal cyanide complex catalysts
US4721818A · kind A · utility
64Cited by
1References
12Claims
0Family size
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Key dates
| Filing date | Mar 20, 1987 |
| Grant date | Jan 26, 1988 |
| Priority date | — |
| Expiry date | Mar 20, 2007 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G65/30
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A method for removing double metal cyanide complex catalyst residue from polyols using alkali metal hydrides is disclosed. In one embodiment, the catalyst residue is converted into an insoluble ionic metal species and separated by filtration using magnesium or aluminum silicate to facilitate separation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.