Patent ID: 8710171
Filing Date: 2014-04-29
Classification: C01D,C07C,C08G

Abstract:
1. A method for the preparation of a poly(aryletherketone) by aromatic nucleophilic substitution in a solvent comprising a diphenyl sulfone, wherein said diphenyl sulfone meets at least all of the following impurity limitations: a monomethyldiphenylsulfone content (sum of all isomers) of less than 0.2 area %; a monochlorodiphenylsulfone content (sum of all isomers) of less than 0.08 area %; a sodium content of less than 55 ppm; a potassium content of less than 15 ppm; an iron content of less than 5 ppm; a residual acidity content of less than 2.0 μeq/g; a diphenyl sulfide content of less than 2.0 wt. %; an APHA of a 20 wt. % solution in acetone at 25° C. of less than 50; and a total chlorine content of less than 120 ppm; wherein ppm and wt. % are based on the total weight of the diphenyl sulfone and area % represents the ratio of the GC peak area of the impurity of concern over the total area of all GC peaks of the diphenyl sulfone.