Branched poly(arylene sulfide) resin and method for producing same

摘要

Disclosed are a branched poly(arylene sulfide) resin having a melt viscosity measured at a temperature of 310° C. and a shear rate of 1200 sec−1 of 65 to 450 Pa·s, a maximum draft ratio of 6500 or more, and a degree of whiteness of 65 or more; moreover, a branched poly(arylene sulfide) resin preferably having a dependence of melt viscosity on shear rate of 1.4 to 2.6 or a melt stability of 0.85 to 1.30; and a method for producing a branched poly(arylene sulfide) resin, wherein a sulfur source and a dihaloaromatic compound are caused to undergo a polymerization reaction at a temperature of 170 to 290° C. in the organic amide solvent in the presence of a polyhaloaromatic compound in an amount of 0.0001 to 0.01 mol per mol of the fed sulfur source.

主权项

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−1 is 65 to 450 Pa·s; (b) the measured maximum draft ratio, VSD/V0, is 6500 or more, wherein the maximum draft ratio is measured by melting a dry polymer at 310° C., discharging the melted polymer at a discharging rate (V0) of 0.05 mm/min, and varying a take-up speed from 5 m/min to 500 m/min over 1 minute, and VSD is a rate at the time when the discharged material is broken; (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−1 to a melt viscosity measured at a temperature of 310° C. and a shear rate of 1200 sec−1 is from 1.4 to 2.6; and (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−1 for 30 minutes to a melt viscosity after retention at a temperature of 310° C. and a shear rate of 1200 sec−1 for 5 minutes, is from 0.85 to 1.30.