Patent ID: 9255350
Filing Date: 2016-02-09
CPC Classification: C08G,D01F,Y10T

Claim Text:
1. A method for producing a branched poly(arylene sulfide) resin having characteristics (a) to (e) described below, wherein the method comprises causing a sulfur source and a dihaloaromatic compound to undergo a polymerization reaction, and wherein the polymerization reaction is one in which the sulfur source and the dihaloaromatic compound are caused to undergo a polymerization reaction at a temperature of 170 to 270° C. in an organic amide solvent, then at a time when the conversion of the dihaloaromatic compound has become 30% or more, a polyhaloaromatic compound in an amount of 0.0001 to 0.008 mol per mol of the fed sulfur source is added to a polymerization reaction mixture, at the same time or thereafter a phase separating agent is added, subsequently the temperature of the polymerization reaction mixture is raised, and then the polymerization reaction is continued at a temperature of 240 to 290° C.: (a) the melt viscosity measured at a temperature of 310° C. and a shear rate of 1200 sec (b) the measured maximum draft ratio, VS (c) the degree of whiteness is 65 or more; (d) the dependence of melt viscosity on shear rate, which is the ratio of a melt viscosity measured at a temperature of 310° C. and a shear rate of 200 sec (e) the melt stability, which is the ratio of a melt viscosity after retention at a temperature of 310° C. and a shear rate of 1200 sec