Double metal cyanide complex catalysts
US5470813A · kind A · utility
276Cited by
26References
36Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 23, 1993 |
| Grant date | Nov 28, 1995 |
| Priority date | — |
| Expiry date | Nov 23, 2013 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G65/30
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Improved double metal cyanide catalysts are disclosed. The substantially amorphous catalysts of the invention are more active for polymerizing epoxides than conventional DMC catalysts, which have a substantial crystalline component. Polyol products made with the catalysts are unusually clear, have exceptionally low unsaturations, and contain no detectable amount of low molecular weight polyol impurities. A method of making the improved DMC catalysts, which involves intimately combining the reactants, is also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.