A polyphenylene sulfide resin composition includes a blend of the following: 100 parts by weight of a polyphenylene sulfide resin (A); 100 to 250 parts by weight of a modified cross-section glass fiber (B); and 25 to 150 parts by weight of a non-fibrous inorganic filler (C) satisfying the following (C-a) and (C-b): (C-a) having a Mohs hardness of more than 2 and less than 4, and (C-b) having a melting point or softening point of 380? C. or more; wherein the ratio X/Y of the mass X of the modified cross-section glass fiber (B) to the mass Y of the non-fibrous inorganic filler (C) is more than 1 and less than 7.

A polyphenylene sulfide resin composition includes a blend of the following: 100 parts by weight of a polyphenylene sulfide resin (A); 100 to 250 parts by weight of a modified cross-section glass fiber (B); and 25 to 150 parts by weight of a non-fibrous inorganic filler (C) satisfying the following (C-a) and (C-b): (C-a) having a Mohs hardness of more than 2 and less than 4, and (C-b) having a melting point or softening point of 380? C. or more; wherein the ratio X/Y of the mass X of the modified cross-section glass fiber (B) to the mass Y of the non-fibrous inorganic filler (C) is more than 1 and less than 7.

Provided is a method of producing polyarylene sulfide (PAS) that suppresses side reactions and produces PAS with a high purity and a high molecular weight at a high yield.

A method of producing PAS in which a sulfur source and a dihalo aromatic compound are polymerized in an organic amide solvent, the method of producing PAS comprising the following steps 1 to 3: step 1: a preparation step of preparing a mixture containing an organic amide solvent, a sulfur source, water, a dihalo aromatic compound, and an alkali metal hydroxide in an amount that is less than an equimolar amount relative to the sulfur source; step 2: a first-stage polymerization step of initiating a polymerization reaction by heating the mixture, and producing a prepolymer having a dihalo aromatic compound conversion rate of 50% or greater; and step 3: a second-stage polymerization step of adding from 0.11 to 0.3 mol of an alkali metal hydroxide per 1 mol of the sulfur source, and continuing the polymerization reaction.

A PAS polymerization reaction solution having a low content of byproduct.

PAS having an average particle diameter of 10 to 5,000 a melt viscosity (temperature 310 C., shear rate 1,216 sec.sup.1) of 0.1 to 3,000 Pa.Math.s, and a nitrogen content of 750 ppm or less.

Provided is a method of producing polyarylene sulfide (PAS) that suppresses side reactions and produces PAS with a high purity and a high molecular weight at a high yield.

A method of producing PAS in which a sulfur source and a dihalo aromatic compound are polymerized in an organic amide solvent, the method of producing PAS comprising the following steps 1 to 3: step 1: a preparation step of preparing a mixture containing an organic amide solvent, a sulfur source, water, a dihalo aromatic compound, and an alkali metal hydroxide in an amount that is less than an equimolar amount relative to the sulfur source; step 2: a first-stage polymerization step of initiating a polymerization reaction by heating the mixture, and producing a prepolymer having a dihalo aromatic compound conversion rate of 50% or greater; and step 3: a second-stage polymerization step of adding from 0.11 to 0.3 mol of an alkali metal hydroxide per 1 mol of the sulfur source, and continuing the polymerization reaction.

A PAS polymerization reaction solution having a low content of byproduct.

PAS having an average particle diameter of 10 to 5,000 a melt viscosity (temperature 310 C., shear rate 1,216 sec.sup.1) of 0.1 to 3,000 Pa.Math.s, and a nitrogen content of 750 ppm or less.

There is provided a polyarylene sulfide configured to satisfy (1) to (4): (1) having a weight-average molecular weight of not less than 10000; (2) having a polydispersity of not greater than 2.5, wherein the polydispersity is expressed by a ratio of the weight-average molecular weight to a number-average molecular weight; (3) having a weight reduction on heating that satisfies an expression of Wr=(W1W2)/W11000.18(%) (where Wr denotes a weight reduction ratio (%) and is a value calculated from a sample weight (W2) at temperature reaching 330 C. relative to a sample weight (W1) at temperature reaching 100 C. in thermogravimetric analysis at a temperature rise rate of 20 C./minute in a non-oxidizing atmosphere at ordinary pressure); and (4) having a nitrogen content of not greater than 200 ppm.

There is provided a polyarylene sulfide configured to satisfy (1) to (4): (1) having a weight-average molecular weight of not less than 10000; (2) having a polydispersity of not greater than 2.5, wherein the polydispersity is expressed by a ratio of the weight-average molecular weight to a number-average molecular weight; (3) having a weight reduction on heating that satisfies an expression of Wr=(W1W2)/W11000.18(%) (where Wr denotes a weight reduction ratio (%) and is a value calculated from a sample weight (W2) at temperature reaching 330 C. relative to a sample weight (W1) at temperature reaching 100 C. in thermogravimetric analysis at a temperature rise rate of 20 C./minute in a non-oxidizing atmosphere at ordinary pressure); and (4) having a nitrogen content of not greater than 200 ppm.

A heat treated fine polyarylene sulfide powder. (i) The heat treated fine polyarylene sulfide powder is manufactured from separation liquid. (ii) The heat treated fine polyarylene sulfide powder is obtained by subjecting the separation liquid to solid-liquid separation to obtain a raw material fine powder polyarylene sulfide. Thereafter the raw material fine powder polyarylene sulfide is subjected to pre-heat treatment and heat treatment. (iii) The heat treated fine polyarylene sulfide powder has an average particle size of from 1 to 80 m. (iv) The heat treated fine polyarylene sulfide powder has a melt viscosity of 1 Pa.Math.s or greater. (v) A generated gas amount of the heat treated fine polyarylene sulfide is 10 ppm or less.

The present invention provides a production method and a production apparatus for a polyarylene sulfide (PAS), thus the formation of a floating polymer and the leakage of the floating polymer to the outside of the vessel in a washing step are prevented, to achieve steady production of the polymer with high quality, to improve the yield of the polymer and to reduce environmental load, wherein the floating polymer refers to a particles of the polymer which are floating on the surface of a washing solution, in the upper part of the inside of a washing vessel, as a result of the adhesion of a gas onto the surface of the particles of the polymer.

The present invention provides a production method for a PAS comprising step (I), performing polymerization, step (II), separating and collecting a polymer, step (III), washing a slurry, and step (IV), collecting the polymer after washing, wherein an aqueous medium is sprayed onto a PAS floating on the surface of the aqueous washing solution in the upper part of the inside of the washing vessel in step (III) (step (IIIa), washing a slurry using a counter current, and/or step (IIIb), treating a slurry with acid using a counter current, or the like); and a production apparatus for a PAS comprising a washing device (counter current washing device and/or a counter current contact/acid treatment device or the like) having an aqueous medium spray means.

The present invention provides a production method and a production apparatus for a polyarylene sulfide (PAS), thus the formation of a floating polymer and the leakage of the floating polymer to the outside of the vessel in a washing step are prevented, to achieve steady production of the polymer with high quality, to improve the yield of the polymer and to reduce environmental load, wherein the floating polymer refers to a particles of the polymer which are floating on the surface of a washing solution, in the upper part of the inside of a washing vessel, as a result of the adhesion of a gas onto the surface of the particles of the polymer.

The present invention provides a production method for a PAS comprising step (I), performing polymerization, step (II), separating and collecting a polymer, step (III), washing a slurry, and step (IV), collecting the polymer after washing, wherein an aqueous medium is sprayed onto a PAS floating on the surface of the aqueous washing solution in the upper part of the inside of the washing vessel in step (III) (step (IIIa), washing a slurry using a counter current, and/or step (IIIb), treating a slurry with acid using a counter current, or the like); and a production apparatus for a PAS comprising a washing device (counter current washing device and/or a counter current contact/acid treatment device or the like) having an aqueous medium spray means.

The invention is directed to a composite structure in which a metal member having a roughened surface and a resin member are joined in a state in which at least a portion of the roughened surface is included. The resin member is made of a molded article obtained by melt-molding a polyarylene sulfide resin composition containing a polyarylene sulfide resin. In the roughened surface, a cumulative pore volume of a pore diameter in a range of 0.1 m to 20 m is in a range of 0.5 nL/mm.sup.2 or more and 5 nL/mm.sup.2 or less measured by mercury porosimetry. According to the invention, it is possible to provide a composite structure that is obtained by joining a metal member and a molded article made of polyarylene sulfide resin composition and is more excellent in joining strength, heat cycle resistance, and sealing properties, and a method for producing the composite structure.