Patent ID: 7655748
Filing Date: 2010-02-02
Classification: C08G

Abstract:
1. A process for producing a poly(arylene sulfide) by polymerizing a sulfur source and a dihalo-aromatic compound in an organic amide solvent, which comprises: (I) in a charging step, controlling charged amounts of the respective components in such a manner that the alkali metal hydroxide is present in a proportion of 1.00 to 1.09 mol per mol of the sulfur source, (II) in a polymerization step, polymerizing the sulfur source and the dihalo-aromatic compound in the presence of the alkali metal hydroxide in the organic amide solvent, (III) in a washing step, washing a polymer formed in the polymerization step repeatedly at least twice with a washing liquid composed of water, a hydrophilic organic solvent or a mixed liquid thereof, and at this time, washing the polymer with water or the mixed liquid at a final washing stage, and controlling washing conditions in such a manner that the pH of the washing liquid after the washing falls within a range of 8.0 to 11.0, and (IV) in a collecting step after the washing step, collecting a polymer having the following properties (a) to (d):