| abstract |
FIELD: chemistry. n SUBSTANCE: method for purifying polyarylene ethers of formula (I) is described: n n n n in which m is a number from 0 to 1.0, n means 1.0-m, and Ar 1 , Ar 2 , Ar 3 and Ar 4 independently of one another, are divalent arylene residues. In the first stage 1, as a result of the contact, realized in the presence of a solvent, of metal salt or ammonium of divalent dihydroxy derivatives of Ar 1, or, respectively, Ar 3 with one or more dihalogenated derivatives of Ar 2 and/or Ar 4 a compound of formula (I) is produced as a crude product. In step B, the existing precipitate is separated, if necessary, by filtration with a number average pore size of the filter of 0.1 to 50 mcm, resulting in a solution, which in step C is filtered through a membrane filter. n EFFECT: increasing the purification degree. n 14 cl, 1 ex |