Acid-catalyzed fabrication of precursors for use in making polyols using double metal cyanide catalysts
US5391722A · kind A · utility
24Cited by
9References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 30, 1990 |
| Grant date | Feb 21, 1995 |
| Priority date | — |
| Expiry date | Mar 30, 2010 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G65/30
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention relates to a process for making a polyol which comprises the steps of: (a) fabricating a propoxylated polyhydric initiator by reacting propylene oxide with a polyhydric initiator in the presence of an acid catalyst, said reaction being conducted in the absence of a KOH catalyst, to produce a propoxylated polyhydric initiator containing acid catalyst residue(s) and free of KOH catalyst residue, and (b) reacting said propoxylated polyhydric initiator containing acid catalyst residue(s) with an alkylene oxide in the presence of a double metal cyanide complex catalyst to produce a polyol.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.