The present disclosure relates to a polysulfide copolymer particle and a method of preparing the polysulfide copolymer particle.

A method for forming a polyarylene sulfide resin is provided. The method comprises reacting an arylene sulfide polymer containing halogen end groups with an end group-modifying compound to form the polyarylene sulfide resin, wherein the end group-modifying compound includes an organic salt of an aminoalkyl carboxylic acid.

A method for forming a polyarylene sulfide resin is provided. The method comprises reacting an arylene sulfide polymer containing halogen end groups with an end group-modifying compound to form the polyarylene sulfide resin, wherein the end group-modifying compound includes an organic salt of an aminoalkyl carboxylic acid.

A poly(phenylene sulfide) fiber contains 1-10% by weight of a poly(phenylene sulfide) oligomer having a weight-average molecular weight of 5,000 or less, has a difference between a cold crystallization heat quantity (Hc) and a crystal melting heat quantity (Hm) during temperature rising in DSC, HmHc, of 25 J/g or larger, and has an elongation of less than 40% and a strength of 3.0 cN/dtex or higher. The poly(phenylene sulfide) fiber has high heat resistance and chemical resistance and high strength and, despite this, has excellent suitability for high-order processing, e.g., thermal shapability, because the amorphous parts thereof have high molecular movability.

A poly(phenylene sulfide) fiber contains 1-10% by weight of a poly(phenylene sulfide) oligomer having a weight-average molecular weight of 5,000 or less, has a difference between a cold crystallization heat quantity (Hc) and a crystal melting heat quantity (Hm) during temperature rising in DSC, HmHc, of 25 J/g or larger, and has an elongation of less than 40% and a strength of 3.0 cN/dtex or higher. The poly(phenylene sulfide) fiber has high heat resistance and chemical resistance and high strength and, despite this, has excellent suitability for high-order processing, e.g., thermal shapability, because the amorphous parts thereof have high molecular movability.

The present invention is a production method for producing polyarylene sulfide, wherein an unreacted dihalo aromatic compound is recovered and reused.

The present invention is a production method for producing polyarylene sulfide, the method include: (a) a polymerization step; (b) a separation step; and (c) a recovery step of recovering an unreacted dihalo aromatic compound from a water-containing mixture in the form of a water-containing liquid mixture containing the separated liquid by steam distillation entailing adjusting the reflux ratio of water in the steam distillation column without adding water other than the refluxed water. Alternatively, the present invention is a production method for producing polyarylene sulfide, the method include: (a) a polymerization step; (d) a dehydration step; and (c) a recovery step of recovering an unreacted dihalo aromatic compound from a water-containing mixture in the form of a water-containing liquid mixture and/or a water-containing steam mixture containing a raw material mixture and/or a polymerization reaction solution by steam distillation entailing adjusting the reflux ratio of water in the steam distillation column without adding water other than the refluxed water in the dehydration step.

The present invention is a production method for producing polyarylene sulfide, wherein an unreacted dihalo aromatic compound is recovered and reused.

The present invention is a production method for producing polyarylene sulfide, the method include: (a) a polymerization step; (b) a separation step; and (c) a recovery step of recovering an unreacted dihalo aromatic compound from a water-containing mixture in the form of a water-containing liquid mixture containing the separated liquid by steam distillation entailing adjusting the reflux ratio of water in the steam distillation column without adding water other than the refluxed water. Alternatively, the present invention is a production method for producing polyarylene sulfide, the method include: (a) a polymerization step; (d) a dehydration step; and (c) a recovery step of recovering an unreacted dihalo aromatic compound from a water-containing mixture in the form of a water-containing liquid mixture and/or a water-containing steam mixture containing a raw material mixture and/or a polymerization reaction solution by steam distillation entailing adjusting the reflux ratio of water in the steam distillation column without adding water other than the refluxed water in the dehydration step.

The present invention relates to certain amine-functionalized polyarylsulfide polymers possessing an advantageous compromise of properties, i.e. a molecular weight such to ensure adequate mechanical properties, a sufficient amine functionalization for appropriate reactivity towards epoxies, and a melting point not exceeding about 260 C., for enabling reaction in the molten state in liquid epoxies during curing thereof; to a method for the manufacture thereof, and to the use thereof for coating applications.

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.