Abstract: A method of producing a polyarylene sulfide composed of amino groups, the method including allowing at least a dihalogenated aromatic compound, an inorganic sulfurizing agent and a compound (A) to react in an organic polar solvent and in the presence of an alkali metal hydroxide, wherein: said compound (A) is present in an amount of 0.04 moles or more and 0.5 moles or less with respect to 1 mole of said inorganic sulfurizing agent, in a reaction vessel; and said compound (A) is a compound comprising at least one aromatic ring, and having, on said one aromatic ring, an amino group, and at least one functional group selected from the group consisting of hydroxyl group, a salt of hydroxyl group, thiol group and a salt of thiol group.

Abstract: A polyarylene sulfide in which when the cumulative integral value from the molecular weight of 100 to the molecular weight of 10,000 in a molecular weight distribution curve is 100, the cumulative integrated value at the molecular weight of 4000 is 48 to 53, and when the melt flow rate of the polyarylene sulfide is defined as MFR1, and when the melt flow rate obtained after mixing the polyarylene sulfide with an epoxy silane coupling agent at a weight ratio of 100:1 and heating the resulting mixture at 315.5° C. for 5 minutes is defined as MFR2, the rate of change represented by MFR2/MFR1 is not more than 0.085.

Abstract: A polyarylene sulfide copolymer has a glass transition temperature of 95° C. or higher and 190° C. or lower and has a melting point of 300° C. or lower or does not have a melting point, as measured by differential scanning calorimetry, and the copolymer containing as a structural unit arylene sulfide units having a number average molecular weight (Mn) of 1,000 or more and 10,000 or less. The polyarylene sulfide copolymer can be provided with high physical stability such as in rigidity at high temperature and excellent moldability and chemical resistance.

Abstract: A fiber-reinforced polyarylene sulfide copolymer composite base material includes a continuous reinforcing fiber, or a reinforcing fiber base material with discontinuous reinforcing fibers dispersed therein; and a polyarylene sulfide copolymer impregnated into the continuous reinforcing fiber or the reinforcing fiber base material; in which the glass transition temperature of the polyarylene sulfide copolymer is 95° C. to 190° C. The fiber-reinforced polyarylene sulfide copolymer composite base material has high workability during molding of molded articles from the composite base material and increased rigidity at high temperature, while having chemical resistance of polyarylene sulfide.

Abstract: A polyphenylene sulfide resin composition exhibits excellent initial toughness and toughness after a long-term high temperature treatment typified by a tensile elongation at break after a dry heat treatment without impairing mechanical strength, chemical resistance and electrical insulation properties. The polyphenylene sulfide resin composition includes 0.01 to 10 parts by weight of an organosilane compound and 0.01 to 5 parts by weight of a metal salt of phosphorus oxoacid based on 100 parts by weight of a polyphenylene sulfide resin, and a tensile elongation at break, which is measured in accordance with ASTM-D638 under the conditions of a tensile speed of 10 mm/min and an ambient temperature of 23° C. after treating at 200° C. for 500 hours using an ASTM No. 4 dumbbell test piece obtained by injection molding the composition, is 10% or more.

Abstract: A polyarylene sulfide copolymer has a glass transition temperature of 95° C. or higher and 190° C. or lower and has a melting point of 300° C. or lower or does not have a melting point, as measured by differential scanning calorimetry, and the copolymer containing as a structural unit arylene sulfide units having a number average molecular weight (Mn) of 1,000 or more and 10,000 or less. The polyarylene sulfide copolymer can be provided with high physical stability such as in rigidity at high temperature and excellent moldability and chemical resistance.

Abstract: A polyphenylene sulfide resin composition includes a polyphenylene sulfide resin (A), an amino group-containing compound (B), an epoxy group-containing elastomer (C), wherein the polyphenylene sulfide resin (A) forms a continuous phase and the amino group-containing compound (B) and the epoxy group-containing elastomer (C) form a dispersed phase in the morphology of a forming product composed of the resin composition observed with a transmission electron microscope, and the modulus of elongation (the elastic modulus determined by performing a tensile test on an ASTM type 1 dumbbell test piece obtained by injection molding at a cylinder temperature of 300° C. and at a mold temperature of 150° C., under the conditions in which the distance between chucks is 114 mm, the test piece distance is 100 mm, and the elongation rate is 10 mm/min) of the resin composition is 1.0 MPa or more and 1000 MPa or less.

Abstract: A polyphenylene sulfide resin composition exhibits excellent initial toughness and toughness after a long-term high temperature treatment typified by a tensile elongation at break after a dry heat treatment without impairing mechanical strength, chemical resistance and electrical insulation properties. The polyphenylene sulfide resin composition includes 0.01 to 10 parts by weight of an organosilane compound and 0.01 to 5 parts by weight of a metal salt of phosphorus oxoacid based on 100 parts by weight of a polyphenylene sulfide resin, and a tensile elongation at break, which is measured in accordance with ASTM-D638 under the conditions of a tensile speed of 10 mm/min and an ambient temperature of 23° C. after treating at 200° C. for 500 hours using an ASTM No. 4 dumbbell test piece obtained by injection molding the composition, is 10% or more.

Abstract: A polyphenylene sulfide resin composition includes a polyphenylene sulfide resin (A), an amino group-containing compound (B), an epoxy group-containing elastomer (C), wherein the polyphenylene sulfide resin (A) forms a continuous phase and the amino group-containing compound (B) and the epoxy group-containing elastomer (C) form a dispersed phase in the morphology of a forming product composed of the resin composition observed with a transmission electron microscope, and the modulus of elongation (the elastic modulus determined by performing a tensile test on an ASTM type 1 dumbbell test piece obtained by injection molding at a cylinder temperature of 300° C. and at a mold temperature of 150° C., under the conditions in which the distance between chucks is 114 mm, the test piece distance is 100 mm, and the elongation rate is 10 mm/min) of the resin composition is 1.0 MPa or more and 1000 MPa or less.

Abstract: A heat-resistant, chemical-resistant polyphenylene sulfide block copolymer containing polyphenylene sulfide units and aromatic polyester units, wherein the polyphenylene sulfide units have a number average molecular weight in the range of 6,000 to 100,000. Provided is a polyphenylene sulfide block copolymer that overcomes the disadvantages of block copolymers including a low-molecular-weight polyphenylene sulfide segment and having poor heat resistance and chemical resistance.

Abstract: A polyarylene sulfide resin composition includes: (A) a polyarylene sulfide resin having a carboxyl group content of more than 100 ?mol/g and less than 400 ?mol/g, and also having a weight average molecular weight of 10,000 or more and less than 100,000; and (B) a filler. The polyarylene sulfide resin composition has improved mechanical properties and chemical resistance while maintaining intrinsic high melting point of a polyarylene sulfide.

Abstract: A heat-resistant, chemical-resistant polyphenylene sulfide block copolymer containing polyphenylene sulfide units and aromatic polyester units, wherein the polyphenylene sulfide units have a number average molecular weight in the range of 6,000 to 100,000. Provided is a polyphenylene sulfide block copolymer that overcomes the disadvantages of block copolymers including a low-molecular-weight polyphenylene sulfide segment and having poor heat resistance and chemical resistance.

Abstract: A polyarylene sulfide resin composition includes: (A) a polyarylene sulfide resin having a carboxyl group content of more than 100 ?mol/g and less than 400 ?mol/g, and also having a weight average molecular weight of 10,000 or more and less than 100,000; and (B) a filler. The polyarylene sulfide resin composition has improved mechanical properties and chemical resistance while maintaining intrinsic high melting point of a polyarylene sulfide.

Abstract: A method is provided for producing a polyarylene sulfide by reacting a sulfidizing agent with a dihalogenated aromatic compound in an organic polar solvent in the presence of an alkali metal hydroxide, the method includes <Step 1>: carrying out the reaction in such a manner that the polymerization time in a temperature range of 230° C. to less than 245° C. (T1a) is not less than 30 minutes and less than 3.5 hours and that the conversion ratio of the dihalogenated aromatic compound at the end of the step is 70 to 98 mol. % and <Step 2>: carrying out the reaction in such a manner that the polymerization time in a temperature range of 245° C. to less than 280° C. (T2) is not less than 5 minutes and less than 1 hour.

Abstract: A method is provided for producing a polyarylene sulfide by reacting a sulfidizing agent with a dihalogenated aromatic compound in an organic polar solvent in the presence of an alkali metal hydroxide, the method includes <Step 1>: carrying out the reaction in such a manner that the polymerization time in a temperature range of 230° C. to less than 245° C. (T1a) is not less than 30 minutes and less than 3.5 hours and that the conversion ratio of the dihalogenated aromatic compound at the end of the step is 70 to 98 mol. % and <Step 2>: carrying out the reaction in such a manner that the polymerization time in a temperature range of 245° C. to less than 280° C. (T2) is not less than 5 minutes and less than 1 hour.

Abstract: A polyphenylene sulfide resin treated by thermal oxidation has a generated gas amount of 0.23 wt % or less when the resin is heated and melted in vacuum at 320° C. for 2 hours; a residual amount of 3.0 wt % or less as a residue when the resin is dissolved in an amount corresponding to 20 times the weight of the resin, of 1-chloronaphthalene at 250° C. for 5 minutes and, as the 1-chloronaphthalene solution, pressure-filtered in a still hot state by a PTFE membrane filter with a pore size of 1 ?m or less; and a melt flow rate (measured at a temperature of 315.5° C. and at a load of 5000 g according to ASTM D-1238-70) of more than 100 g/10 min to 500 g/10 min.

Abstract: A process for producing a polyphenylene sulfide resin with properties of (1) 0.3 wt % or less in the amount of the volatile gas generated when heated and melted at 320° C. in vacuum for 2 hours, (2) 0.3 wt % or less in the ash content achieved when incinerated at 550° C., (3) 4.0 wt % or less in the residue amount achieved when a solution with 1 part by weight of the polyphenylene sulfide resin dissolved in 20 parts by weight of 1-chloronaphthalene is pressure-filtered by a PTFE membrane filter with a pore size of 1 ?m at 250° C. for 5 minutes, and (4) higher than 500 g/10 min in melt flow rate (according to ASTM D-1238-70: measured at a temperature of 315.5° C. and at a load of 5000 g), by acid-treating a polyphenylene sulfide resin in an acid treatment step and subsequently treating it for thermal oxidation in a thermal oxidation step.

Abstract: A polyphenylene sulfide resin treated by thermal oxidation has a generated gas amount of 0.23 wt % or less when the resin is heated and melted in vacuum at 320° C. for 2 hours; a residual amount of 3.0 wt % or less as a residue when the resin is dissolved in an amount corresponding to 20 times the weight of the resin, of 1-chloronaphthalene at 250° C. for 5 minutes and, as the 1-chloronaphthalene solution, pressure-filtered in a still hot state by a PTFE membrane filter with a pore size of 1 ?m or less; and a melt flow rate (measured at a temperature of 315.5° C. and at a load of 5000 g according to ASTM D-1238-70) of more than 100 g/10 min to 500 g/10 min.