Patent ID: 9163119
Filing Date: 2015-10-20
Classification: C08G

Abstract:
1. A method for preparing a heat-set polyarylene sulfide having a melting temperature of 265 to 320° C. and a free iodine content of at most 20 ppm, comprising: (a) polymerizing reactants including a diiodo aromatic compound, a polymerization inhibitor, and a sulfur compound at an initial temperature of 180° C. to 250° C. and at a final temperature of 270° C. to 350° C. to form a polyarylene sulfide product; and (b) maintaining the polyarylene sulfide product at 150° C. to 230° C. for heat-setting for 0.5 to 100 hours to give a heat-set polyarylene sulfide; wherein: the heat-set polyarylene sulfide has a melting temperature of 265° C. to 320° C. and a free iodine content of at most 20 ppm; the heat-set polyarylene sulfide has a melting temperature variation of less than 5% before and after the heat-setting step (b); and the polymerization inhibitor is at least one of N-cyclohexylbenzothiazole-2-sulfenamide, N,N-dicyclohexyl-2-benzothiazole sulfenamide, tetramethylthiuram monosulfide, tetramethylthiuram disulfide, zinc dimethyldithiocarbamate, zinc diethyldithiocarbamate, and diphenyl disulfide.