| abstract |
The present invention is a process for the purification of poly (arylene ether) of formula (I) (Wherein m = 0 to 1.0, and n = 1.0 - m Ar 1 , Ar 2 , Ar 3 and Ar 4 are each independently a divalent arylene residue) The compounds of the formula (I), by the presence of a solvent LM1, contacting a metal salt or ammonium salt of the divalent dihydroxy derivatives of Ar 1 or Ar 3 and one or more dihalogenated derivatives of Ar 2 and / or Ar 4 Is prepared in the first step 1 to obtain the crude product. The precipitate which may be present is removed (step B) to obtain solution L, which is then subjected to membrane filtration (step C). |