Abstract: A polyarylene sulfide resin composition which yields a molded article with excellent toughness, as well as a molded article and an optical ferrule, which are produced using the polyarylene sulfide resin composition. In a polyarylene sulfide resin composition containing a polyarylene sulfide resin and silica particles, a specific amount of a polyarylene sulfide resin having a melt viscosity of 35 to 80 Pa·s, and a specific amount of silica particles having a lower content of coarse powders with a particle size of 45 ?m or more are employed.

Abstract: Provided are a polyarylene sulfide resin composition which yields a molded article with excellent toughness, as well as a molded article and an optical ferrule, which are produced using the polyarylene sulfide resin composition. In a polyarylene sulfide resin composition containing a polyarylene sulfide resin (A) and silica particles (B), a specific amount of a polyarylene sulfide resin (A) having a melt viscosity of 35 to 80 Pa·s, and a specific amount of silica particles (B) having a lower content of coarse powders with a particle size of 45 ?m or more are employed.

Abstract: Provided is a method of suppressing burrs that occur during injection-molding of a polyarylene sulfide resin composition, including: adding at least 0.01 to 5 parts by mass of a carbon nanostructure to 100 parts by mass of a polyarylene sulfide resin and melt-kneading at least the carbon nanostructure and the polyarylene sulfide resin.

Abstract: A polyarylene sulfide-based resin composition is disclosed containing a polyarylene sulfide-based resin A, an inorganic filler B, and olefinic copolymers C and D each having predetermined structural units, wherein: the inorganic filler B contains a fibrous inorganic filler B1 having a different diameter ratio of 1.5 or less and a fibrous inorganic filler B2 having a different diameter ratio of 3.0 or more; a mass ratio B1/B2 of the fibrous inorganic filler B1 and the fibrous inorganic filler B2 is 0.2 or more and 5.0 or less; and the contents of the olefinic copolymers C and D are respectively 3 parts by mass or more and less than 19 parts by mass and 3 parts by mass or more and 30 parts by mass or less with respect to 100 parts by mass of the polyarylene sulfide-based resin A.

Abstract: A polyarylene sulfide-based resin composition is disclosed containing a polyarylene sulfide-based resin A, an inorganic filler B, and olefinic copolymers C and D each having predetermined structural units, wherein: the inorganic filler B contains a fibrous inorganic filler B1 having a different diameter ratio of 1.5 or less and a fibrous inorganic filler B2 having a different diameter ratio of 3.0 or more; a mass ratio B1/B2 of the fibrous inorganic filler B1 and the fibrous inorganic filler B2 is 0.2 or more and 5.0 or less; and the contents of the olefinic copolymers C and D are respectively 3 parts by mass or more and less than 19 parts by mass and 3 parts by mass or more and 30 parts by mass or less with respect to 100 parts by mass of the polyarylene sulfide-based resin A.

Abstract: A polyarylene sulfide resin composition characterized by comprising a polyarylene sulfide resin, and an olefinic copolymer comprising an ?-olefin-derived structural unit and an ?,?-unsaturated acid glycidyl ester-derived structural unit, wherein the olefinic copolymer content is at least 1.0 parts by mass and less than 5.0 parts by mass with respect to 100 parts by mass of the polyarylene sulfide resin, a melt viscosity of the polyarylene sulfide resin measured at 310° C. and a shear rate of 1216 sec?1 is at least 70 Pa·s and at most 300 Pa·s, and a flow length for a width of 20 mm and a thickness of 1 mm, at a cylinder temperature of 320° C., an injection pressure of 100 MPa and a mold temperature of 150° C., is at least 80 mm and at most 200 mm.

Abstract: [Problem] To provide: a polyarylene sulfide resin composition having excellent high- and low-temperature impact properties and excellent low warpage; and an insert-molded article using the resin composition. [Solution] A polyarylene sulfide resin composition that contains a polyarylene sulfide resin A, an inorganic filler B, and an olefinic copolymer C containing a structural unit derived from an ?-olefin and a structural unit derived from a glycidyl ester of an a, p-unsaturated acid, the inorganic filler B containing a fibrous inorganic filler B1 having a different diameter ratio, which is a ratio of the major axis to the minor axis of a cross section perpendicular to the longitudinal direction, of 1.5 or less, and a fibrous inorganic filler B2 having a different diameter ratio of 3.0 or more, the mass ratio B1/B2 of the fibrous inorganic filler B1 and the fibrous inorganic filler B2 being 0.2 or more and 5.0 or less.

Abstract: A polyarylene sulfide resin composition characterized by comprising a polyarylene sulfide resin, and an olefinic copolymer comprising an ?-olefin-derived structural unit and an ?,?-unsaturated acid glycidyl ester-derived structural unit, wherein the olefinic copolymer content is at least 1.0 parts by mass and less than 5.0 parts by mass with respect to 100 parts by mass of the polyarylene sulfide resin, a melt viscosity of the polyarylene sulfide resin measured at 310° C. and a shear rate of 1216 sec?1 is at least 70 Pa·s and at most 300 Pa·s, and a flow length for a width of 20 mm and a thickness of 1 mm, at a cylinder temperature of 320° C., an injection pressure of 100 MPa and a mold temperature of 150° C., is at least 80 mm and at most 200 mm.

Abstract: A polyarylene sulfide-derived resin composition which has flowability optimal for insert molding and which can impart superior high- and low-temperature impact properties to a molded body, and an insert-molded body using the resin composition. The resin composition includes a polyarylene sulfide resin having carboxylic terminal groups, an olefin-derived copolymer, glass fibers and calcium carbonate. The weight-average molecular weight of the polyarylene sulfide resin is 15,000-40,000; as copolymerization components, the olefin-derived copolymer includes ?-olefins, glycidyl esters of ?,?-unsaturated acids, and acrylic esters, and the content of the copolymerization component derived from the glycidyl esters in the resin composition is 0.2-0.6 mass %. Further, the fiber diameter of the glass fibers is 9-13 ?m, the average particle diameter of the calcium carbonate is 10-50 ?m, and the total content of glass fibers and the calcium carbonate is 45-55 mass % of the resin composition.

Abstract: A method is provided for obtaining a polyarylene sulfide resin composition with a low chlorine content, which has high fluidity and high quality and produces less burrs. Specifically, a method is provided wherein a polyarylene sulfide resin composition is produced by melting and mixing (A) a polyarylene sulfide resin, (B) an inorganic filler, and (C) an alkoxysilane compound. In this method, (A) a polyarylene sulfide resin having a melt viscosity of 80-400 Pa·s (at a temperature of 310° C. and a shear rate of 1200/sec) and a chlorine content of 1000-2000 ppm is supplied from a raw material feed port of a specific extruder, and then extruded at two kneading parts within the range of [shear rate (1/sec)×kneading time (sec)=1600-6000], thereby producing a polyarylene sulfide resin composition having a melt viscosity of 150-330 Pa·s (at a temperature of 310° C. and a shear rate of 1200/sec) and a chlorine content of not more than 950 ppm.

Abstract: To provide a polyarylene sulfide resin composition which contains decreased amount of chlorine, which has a high fluidity and generates small flashes at the time of molding, which has an excellent heat resistance, which can resist heat-processing under the condition of a high temperature, which has moldability at a low mold temperature, a molded article of which has an extremely small change in surface hue before and after reflow.

Abstract: A method is provided for obtaining a polyarylene sulfide resin composition with a low chlorine content, which has high fluidity and high quality and produces less burrs. Specifically, a method is provided wherein a polyarylene sulfide resin composition is produced by melting and mixing (A) a polyarylene sulfide resin, (B) an inorganic filler, and (C) an alkoxysilane compound. In this method, (A) a polyarylene sulfide resin having a melt viscosity of 80-400 Pa·s (at a temperature of 310° C. and a shear rate of 1200/sec) and a chlorine content of 1000-2000 ppm is supplied from a raw material feed port of a specific extruder, and then extruded at two kneading parts within the range of [shear rate (1/sec)×kneading time (sec)=1600-6000], thereby producing a polyarylene sulfide resin composition having a melt viscosity of 150-330 Pa·s (at a temperature of 310° C. and a shear rate of 1200/sec) and a chlorine content of not more than 950 ppm.

Abstract: A modified polyacetal is obtainable by heating 0.1 to 30 parts by weight of (B) a polymerizable compound having a modifying group such as an epoxy group, a carboxyl group or an acid anhydride group relative to 100 parts by weight of (A) a base polyacetal and introducing the modifying group of the polymerizable compound to the base polyacetal. The base polyacetal (A) includes (A1) a polyacetal selected from polyoxymethylene homopolymers and copolymers, and (A2) a polymerizable polyacetal having a functional group comprising a polymerizablly unsaturated bond. The introduction efficiency of the modifying group can be enhanced by adding 0.01 to 2.5 parts by weight of (C) a free-radical initiator relative to 100 parts by weight of the total amount of the components (A) and (B), and mixing the resultant mixture under a molten state of the polyacetal. According to such method, the affinity of the polyacetal is improved by introducing the modifying group to the base polyacetal with ease and high efficiency.