Abstract: A poly(phenylene sulfide) resin composition having high loss factors at 50° C. or higher and 100° C. or lower is provided. The poly(phenylene sulfide) resin composition contains poly(p-phenylene sulfide) and poly(m-phenylene sulfide).

Abstract: Provided are: a halogenated polyphenylene sulfide resin that can make a resin vibration-damping without use of a filler when added to the resin; a resin composition containing the halogenated polyphenylene sulfide resin and another resin; a molded article formed of the resin composition; and a vibration-damping agent for a resin, the vibration-damping agent containing the halogenated polyphenylene sulfide resin. A halogenated polyphenylene sulfide resin is used as a component to make a resin vibration-damping in a resin composition. The halogenated polyphenylene sulfide resin is produced by polycondensation reaction of a halogenated benzene and an alkali metal sulfide. The halogenated benzene is a dihalobenzene and/or a trihalobenzene. A ratio of a mass of the trihalobenzene to a mass of the halogenated benzene being 50 mass % or greater.

Abstract: A decrease in molecular weight in molding of a polyamide is suppressed. A polyamide resin composition of the present invention includes: a polyamide having a structural unit containing an alkylene group having 1 to 3 carbon atoms and an amide bond; and a compound having a cyclic structure in which first nitrogen and second nitrogen of a carbodiimide group are bonded by a bonding group. A molded polyamide resin article is produced by molding of the polyamide resin composition through heat pressurization.

Abstract: The present invention is to provide a method that can produce polyarylene sulfide having a high viscosity at a high yield. The method of producing polyarylene sulfide according to an embodiment of the present invention includes: a preparation step of preparing a mixture containing an organic amide solvent, a sulfur source, a dihalo aromatic compound, and an alkali metal hydroxide; a first-stage polymerization step of initiating a polymerization reaction by heating the mixture and producing a prepolymer until a pH of a reaction system reaches a range of 10 to 11; and a second-stage polymerization step of continuing the polymerization reaction.

Abstract: Provided is a method of producing polyarylene sulfide at low cost while productivity enhancement and resource saving are attempted by avoiding the use of a complicated step and special apparatus (facility). The method of producing polyarylene sulfide according to an embodiment of the present invention includes: a preparation step of preparing a mixture containing an organic amide solvent, a sulfur source, a dihalo aromatic compound, and an alkali metal hydroxide in an amount less than an equimolar amount relative to an amount of the sulfur source; a first-stage polymerization step of initiating a polymerization reaction by heating the mixture, and producing a prepolymer having a dihalo aromatic compound conversion ratio of 50% or greater; and a second-stage polymerization step of adding an alkali metal hydroxide such that the alkali metal hydroxide is in an amount of 1.00 to 1.10 mol per 1 mol of the sulfur source, and continuing the polymerization reaction in a homogeneous liquid phase condition.

Abstract: The present invention is to provide a method that can produce polyarylene sulfide having a high viscosity at a high yield. The method of producing polyarylene sulfide according to an embodiment of the present invention includes: a preparation step of preparing a mixture containing an organic amide solvent, a sulfur source, a dihalo aromatic compound, and an alkali metal hydroxide; a first-stage polymerization step of initiating a polymerization reaction by heating the mixture and producing a prepolymer until a pH of a reaction system reaches a range of 10 to 11; and a second-stage polymerization step of continuing the polymerization reaction.

Abstract: Provided is a method of producing polyarylene sulfide at low cost while productivity enhancement and resource saving are attempted by avoiding the use of a complicated step and special apparatus (facility). The method of producing polyarylene sulfide according to an embodiment of the present invention includes: a preparation step of preparing a mixture containing an organic amide solvent, a sulfur source, a dihalo aromatic compound, and an alkali metal hydroxide in an amount less than an equimolar amount relative to an amount of the sulfur source; a first-stage polymerization step of initiating a polymerization reaction by heating the mixture, and producing a prepolymer having a dihalo aromatic compound conversion ratio of 50% or greater; and a second-stage polymerization step of adding an alkali metal hydroxide such that the alkali metal hydroxide is in an amount of 1.00 to 1.10 mol per 1 mol of the sulfur source, and continuing the polymerization reaction in a homogeneous liquid phase condition.