POLYARYLENE SULFIDE AND PROCESS FOR PRODUCING THE SAME

摘要

A mixture which comprises an organic amide solvent and a sulfur source comprising an alkali metal hydrosulfide and optionally contains part of the whole alkali metal hydroxide to be introduced is heated to conduct a dehydration step. The mixture remaining in the system after the dehydration step is mixed with a dihaloaromatic compound. The resultant mixture is heated to polymerize it and, simultaneously therewith, an alkali metal hydroxide is continuously or portion-wise added to the polymerization reaction mixture to regulate the pH of the polymerization reaction mixture to 7 to 12.5 throughout the period of from the initiation to the termination of the polymerization. The polyarylene sulfide has a nitrogen content of 800 ppm or lower.