DIVISION OF A POLYARYLENE ETHER SOLUTION

摘要

Process for producing polyarylene ether beads from a polyarylene ether solution, comprising the steps of
i) dividing the polyarylene ether solution into droplets,ii) transferring the droplets into a precipitation bath to form polyarylene ether beads in the precipitation bath which(A) comprises at least one aprotic solvent (component (1)) and at least one protic solvent (component (2)),(B) has a temperature of 0° C. to Tc, where the critical temperature Tc in [° C.] can be determined by the numerical equation Tc=(77−c)/0.58 in which c is the concentration of component (1) in the precipitation bath in [% by weight] and(C) has component (1) in concentrations of 5% by weight to cc, where the critical concentration cc in [% by weight] can be determined by the numerical equation cc=77−0.58*T in which T is the temperature in the precipitation bath in [° C.], where

the percentages by weight are each based on the sum of the percentages by weight of component (1) and of component (2) in the precipitation bath.

主权项

1. A process for producing polyarylene ether beads from a polyarylene ether solution, the process comprising:
i) dividing the polyarylene ether solution into droplets; and ii) transferring the droplets into a precipitation bath to form polyarylene ether beads in the precipitation bath, wherein the precipitation bath (A) comprises at least one aprotic solvent (component (1)) and at least one protic solvent (component (2)); (B) has a temperature of 0° C. to Tc, where the critical temperature Tc in [° C.] can be determined by the numerical equation Tc=(77−c)/0.58 in which c is the concentration of component (1) in the precipitation bath in [% by weight] and (C) has component (1) in a concentration of 12 to 70% by weight, where the percentage by weight is based on the sum of the percentages by weight of component (1) and of component (2) in the precipitation bath, wherein the precipitation bath comprises water or alcohol as component (2), wherein the polyarylene ether solution has a concentration of 5 to 50% by weight of polyarylene ether in the aprotic solvent, where the percentage by weight are based on the sum of the percentages by weight of the polyarylene ether and the aprotic solvent, wherein the polyarylene ether solution in the dividing has a temperature of 15 to 250° C., and wherein the aprotic solvent is at least one selected from the group consisting of N-methyl-2-pyrrolidone and N-ethyl-2-pyrrolidone.