| abstract |
(57) [Abstract] [PROBLEMS] To provide a (ultra) high molecular weight polyarylene sulfide having excellent handleability. SOLUTION: The pre-polymerization is performed until the melt viscosity of the produced prepolymer becomes 5 to 300 poise, the prepolymer is separated from the reaction system, and then the prepolymer is redispersed in a water-containing aprotic polar organic solvent, A method for producing a (ultra) high molecular weight polyarylene sulfide, which comprises performing the following post-polymerization in a strongly alkaline state. (A) Stirring the reaction system at 257 to 290 [deg.] C. for at least 10 minutes (b) Next, stirring and holding the reaction system at 220 to 250 [deg.] C. for at least 2.0 hours (c) Then, if necessary, the reaction system 250 to 29 Keep stirring at 0 ℃ |