POLYARYLENE SULFIDE RESIN COMPOSITION

PURPOSE:To obtain the title resin composition markedly improved in an effect of accelerating crystallization during molding and excelling in heat resistance and moldability, by mixing a polyarylene sulfide resin with a specified phosphoric ester. CONSTITUTION:The title resin composition is obtained by mixing 100pts.wt. polyphenylene sulfide resin (A) (e.g., a polyphenylene sulfide of a melt viscosity of 10-20,000P when measured under conditions of 310 deg.C and a shear rate of 1,200/sec) with a phosphoric ester (B) of formula I (wherein R is a bivalent organic group, R is a 1-20C aliphatic group, a 3-13C alicyclic group or a 6-18C aromatic group, and n is 0-3), e.g., a compound of formula II or III, and an inorganic filler (C) (e.g., glass fiber). When compared with a conventional resin composition of the same type, this resin composition is markedly improved in an effect of accelerating crystallization during molding. Namely, it can give a highly crystalline molding even when it is molded at a mold temperature lower than usual by 10-60 deg.C, and it is featured in that the molding is excellent in dimensional stability, the molding cycle is short, the productivity is improved, the operation is easy, and the molding is excellent in heat resistance.