Patent ID: 8609790
Filing Date: 2013-12-17
Classification: C08G

Abstract:
1. A production process of a granular poly(arylene sulfide), comprising a step of polymerizing a sulfur source and a dihalo-aromatic compound in an organic amide solvent, said polymerization step comprising a phase-separation polymerization step, wherein the polymerization reaction is continued in the presence of a phase separation agent in a phase-separated state and a concentrated formed polymer phase and a dilute formed polymer phase are present in a mixed state in a liquid phase within the polymerization reaction system, wherein the production process comprises: (1) a step I of adding an aromatic compound in a proportion of 0.01 to 20 mol per 100 mol of the organic amide solvent into the liquid phase containing the organic amide solvent and a formed polymer within the polymerization reaction system, said liquid phase being in the phase-separated state, after the phase-separation polymerization step; (2) a step II of cooling the liquid phase within the polymerization reaction system; and (3) a step III of collecting the formed polymer from the liquid phase, and wherein the step II comprises a stage in which the liquid phase is slowly cooled by controlling a temperature-lowering rate to 2.0 to 0.1° C./min until the temperature of the liquid phase is lowered to 220° C. from the polymerization temperature in the phase-separation polymerization step.