Patent ID: 8648142

Claim:
A poly(arylene sulfide) resin composition, comprising: (A) 100 parts by weight of a straight-chain poly(arylene sulfide) resin having a melt viscosity of 5 to 1,000 Pa·s as measured at a temperature of 310° C. and a shear rate of 1,216 sec −1 , (B) 1 to 50 parts by weight of a branched poly(arylene sulfide) resin having a melt viscosity of 11.0×10 4 to 27.0×10 4 Pa·s as measured at a temperature of 330° C. and a shear rate of 2 sec −1 , an average particle diameter of 50 to 2,000 μm and a melt viscoelasticity tan δ of 0.10 to 0.30 as measured at a temperature of 310° C. and an angular velocity of 1 rad/sec, wherein (B) the branched poly(arylene sulfide) resin has a melt viscosity and an average particle diameter that fall within a region of a pentagon formed by linking 5 points in a graph that a melt viscosity measured at a temperature of 330° C. and a shear rate of 2 sec −1 is plotted on x axis, and an average particle diameter is plotted on y axis, i.e., the point A represented by x=11.0×10 4 Pa·s and y=2,000 μm, the point B represented by x=11.0×10 4 Pa·s and y=50 μm, the point C represented by x=27.0×10 4 Pa·s and y=50 μm, the point D represented by x=27.0×10 4 Pa·s and y=160 μm and the point E represented by x=11.7×10 4 Pa·s and y=2,000 μm, by respective straight lines, and wherein the branched poly(arylene sulfide) resin is a branched poly(arylene sulfide) resin into which a branched structure has been introduced by a process including reacting a sulfur source containing more than 50 mol % of the alkali metal hydrosulfide and a dihalo-aromatic compound in an organic amide solvent and adding a polyhalo-aromatic compound having 3 or more halogen substituents in a predetermined proportion to the polymerization reaction mixture at the point of time the conversion of the dihalo-aromatic compound has reached at least 80%, and (C) 1 to 400 parts by weight of an inorganic filler, wherein the poly(arylene sulfide) resin composition contain (B) the branched poly(arylene sulfide) resin, whereby the occurrence of burr is markedly inhibited, and molded products excellent in surface properties can be provided, and mold-corroding tendency is reduced.