Process for purifying and end-capping polyols made using double metal cyanide catalysts
US5235114A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 18, 1992 |
| Grant date | Aug 10, 1993 |
| Priority date | — |
| Expiry date | May 18, 2012 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G65/30
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process for producing an ethylene oxide-capped polyol which is essentially free of catalyst residues, wherein the polyol is produced using a double metal cyanide catalyst, which comprises after polyol formation the steps of: (a) contacting a catalyst residue(s)-containing polyol with an effective amount of an oxidant (preferably selected from the group consisting of: oxygen-containing gas(es), peroxide(s), acids, and combinations thereof) to cause said catalyst residue(s) to form insoluble residues that are insoluble in the polyol; (b) separating the insoluble residues from the polyol to provide an essentially double metal cyanide catalyst residue-free polyol; (c) treating said double metal cyanide catalyst residue-free polyol with a base to provided a base-treated polyol; (d) contacting said base-treated polyol with ethylene oxide to produce an ethylene oxide-capped polyol containing base, wherein at least a portion of the secondary hydroxyl groups on said polyol are converted into primary hydroxyl groups, and (e) contacting said ethylene oxide-capped polyol containing base with an ion exchange resin in order to separate said base from said ethylene oxide capped polyol to provid…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.