Direct polyoxyalkylation of glycerine with double metal cyanide catalysis
US6077978A · kind A · utility
22Cited by
4References
27Claims
0Family size
Assignee
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Key dates
| Filing date | Sep 17, 1997 |
| Grant date | Jun 20, 2000 |
| Priority date | — |
| Expiry date | Sep 17, 2017 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G65/2696
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Acidification, neutralization, or removal of basic impurities from acid sensitive low molecular weight starter or acidification of a reactor heel prior to addition of acid sensitive low molecular weight starter allows direct oxyalkylation of continuously added acid sensitive low molecular weight starter to produce polyoxyalkylene acid sensitive low molecular weight starter-initiated or co-initiated polyols in the presence of a double metal cyanide catalyst. The preferred acid sensitive low molecular weight starter is glycerine.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.