| 摘要 |
Provided is a process for producing polyarylene sulfide (PAS) that suppresses secondary reactions and obtains PAS of high purity and high molecular weight at a high yield. A process for producing PAS in which a sulfur source and a dihalo-aromatic compound are polymerized in an organic amide solvent, wherein the process for producing PAS includes steps 1-3: step 1: a preparation step for preparing a mixture containing an organic amide solvent, a sulfur source, water, a dihalo-aromatic compound, and less than an equimolar amount of alkali metal hydroxide relative to the sulfur source; step 2: an early polymerization step for initiating a polymerization reaction by heating the mixture, and producing a prepolymer having a dihalo-aromatic compound conversion rate of 50% or higher; and step 3: a late polymerization step for adding 0.11-0.3 mol of an alkali metal hydroxide per mol of sulfur source, and continuing the polymerization reaction: PAS polymerization reaction solution having a low byproduct content: and PAS having an average particle size of 10-5000 μm, a melt viscosity (temperature 310°C, shear rate 1216 sec-1) of 0.1-3000 Pa・s, and a nitrogen content of 750 ppm or less. |
