Process for preparation of a polyetherketone
US5258491A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 4, 1992 |
| Grant date | Nov 2, 1993 |
| Priority date | — |
| Expiry date | Sep 4, 2012 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G61/12
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Disclosed is a process for removing the Lewis acid catalyst, polymerization solvent and byproducts, such as ketals, from a polyetherketone comprising PA0 (A) introducing into an extraction zone a Lewis acid polymerization catalyst, a polymerization solvent and a polyetherketone, PA0 (B) passing an alcohol through the extraction zone to remove a majority of the Lewis acid catalyst and the polymerization solvent, PA0 (C) passing water through the extraction zone to remove a majority of the alcohol, PA0 (D) contacting the polyetherketone with an aqueous acid solution, PA0 (E) passing water through the extraction zone to remove a majority of the acid, PA0 (F) passing steam through the extraction zone, and PA0 (G) subjecting the polyetherketone to a reduced pressure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.