Process for preparing a poly(aryl ether ketone) using a high purity 4,4′-difluorobenzophenone
US9815937B2 · kind B2 · utility
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4References
14Claims
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Key dates
| Filing date | Sep 22, 2015 |
| Grant date | Nov 14, 2017 |
| Priority date | — |
| Expiry date | Oct 11, 2035 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G2261/3444
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention describes a process for preparing a poly(aryl ether ketone) by reacting a nucleophile with 4,4′-difluorobenzophenone (4,4′-DFBP) that is improved through the use of 4,4′-DFBP that meets one or more particular purity conditions. Also described are improved poly(aryl ether ketone) produced using the invention 4,4′-DFBP. Amounts of 2,4′-difluorobenzophenone (2,4′-DFBP), 4-monofluorobenzophenone (4-FBP), chlorine, and monochloromonofluorobenzophenone in 4,4′-DFBP are discussed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.