Patent ID: 10059802

Abstract:
Provided is a method for producing polyphenylene ether (PPE) having excellent mechanical properties, heat aging resistance, and color, and in which the content of impurities such as low molecular weight components and catalyst metal is low. The method for producing PPE includes: performing oxidative polymerization of a phenolic compound in a polymerization solution containing the phenolic compound, a catalyst, and an aromatic solvent to obtain a PPE mixed liquid; precipitating PPE to obtain a slurry containing particulate PPE through addition of a polar solvent to the PPE mixed liquid; solid-liquid separating the slurry to obtain wet PPE particles; washing the wet PPE particles to obtain PPE particles through at least one cycle of a washing and solid-liquid separation process in which washing is performed with a washing liquid containing an aromatic solvent and a polar solvent, and in which solid-liquid separation is performed; and drying the PPE particles.