Patent ID: 9422401
Filing Date: 2016-08-23
CPC Classification: C08G,C08J

Claim Text:
1. A method for preparing polyarylene sulfide, comprising: polymerizing reactants comprising diiodide aromatic compounds, an initial amount of sulfur compound, and, based on 100 parts by weight of the diiodide aromatic compounds, 0.05 to 10 parts by weight of a polymerization terminator; and adding an additional amount of sulfur compound at a point after the addition of the initial amount of a sulfur compound, wherein the additional amount of sulfur compound is 1 to 10 parts by weight based on 100 parts by weight of the initial amount of sulfur compound; wherein the polyarylene sulfide has an initial melt viscosity of 300 to 6000 poise measured at 300° C., and a melt viscosity after heat treated and molten at 300° C. which is equal to or greater than the initial melt viscosity; and wherein the polyarylene sulfide has a melt viscosity change rate of 0 to 20% as defined by Equation 1: wherein: MV the polyarylene sulfide has a melting temperature of 270 to 285° C.; and the diiodide aromatic compounds are included in that reactants in the content of 0.9 moles or more based on the initial amount of sulfur compounds.