| abstract |
(57) [Summary] [Structure] Polyhalogen diphenyl sulfone and dihydric phenol compound are produced in the presence of anhydrous alkali metal carbonate and / or anhydrous alkali metal hydrogen carbonate in an organic polar solvent to produce polyether sulfone. In this case, a method for producing a polyether sulfone, which comprises reacting by adding a monohydric phenol compound. [Effect] The reactive end of polyether sulfone is terminated with a monohydric phenol compound, the molecular weight can be easily adjusted, and the increase in melt viscosity due to heating can be prevented, which improves molding stability and facilitates processing. It can be carried out. |