IMPROVED METHOD FOR PRODUCING POLY(ARYL ETHER KETONE) USING HIGH PURITY 4,4'-DIFLUOROBENZOPHENONE

摘要

PROBLEM TO BE SOLVED: To provide a method for preparing a semicrystalline poly(aryl ether ketone) (PAEK) having improved crystallinity and/or melt stability.SOLUTION: There is provided a method for producing a semicrystalline PAEK by reacting a nucleophilic agent and 4,4'-difluorobenzophenone, wherein the 4,4'-difluorobenzophenone satisfies the following impurity limits and the method is carried out in the presence of diphenyl sulfone under certain conditions. The amount of 2,4'-difluorobenzophenone and 4-monofluorobenzophenone in [2,4'-difluorobenzophenone] + [4-monofluorobenzophenone]1250 ppm is determined by liquid chromatography analysis.