Process for preparing a poly(aryl ether ketone) using a high purity 4,4'-difluorobenzophenone
AssigneeSolvay Advanced Polymers, L.L.C.
InventorChantal Louis
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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.
Claims15
A process for preparing a semi-crystalline poly(aryl ether ketone), said process comprising reacting a nucleophile with a 4,4′-difluorobenzophenone, wherein the 4,4′-difluorobenzophenone meets the following impurity limitation:
- [2,4′-difluorobenzophenone]+[4-monofluorobenzophenone]≦1250 ppm
- wherein the amounts of 2,4′-difluorobenzophenone and 4-monofluorobenzophenone in 4,4′-difluorobenzophenone are determined by liquid chromatography analysis.
Dependencies are inferred from the claim text.