Method of producing polyarylene sulfide
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United States of America Patent
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Feb 20, 2018
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app pub date -
Mar 27, 2015
filing date -
Mar 31, 2014
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Abstract
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 μm, a melt viscosity (temperature 310° C., shear rate 1,216 sec−1) of 0.1 to 3,000 Pa·s, and a nitrogen content of 750 ppm or less.
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