PROCESS FOR PREPARING POLYARYLENE SULFIDES

摘要

PROCESS FOR PREPARING POLYARYLENE SULFIDES In a process for preparing a polyarylene sulfide by polycondensation of a dihalogenated aromatic compound with a source of sulfur in an organic polar solvent, the resulting polyarylene sulfide in a powdery form is added to a polycondensation system containing the dihalogenated aromatic compound and the source of sulfur in the organic polar solvent and subjected to polycondensation, thereby producing the polyarylene sulfide in a granular form. The granular polyarylene sulfide is easier in handling and higher in qualtiy than the powdery polyarylene sulfide. The powdery polyarylene sulfide recovered can be reused so that the process is economical. Also the powdery polyarylene sulfide containing low molecular components such as oligomers is separated from the granular polyarylene sulfide so that the granular polyarylene sulfide is more useful than the powdery one .