The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 22, 2006
Filed:
Nov. 29, 2002
Michihisa Miyahara, Fukushima-Ken, JP;
Norio Saitou, Fukushima-Ken, JP;
Mitsuhiro Matsuzaki, Fukushima-Ken, JP;
Michihisa Miyahara, Fukushima-Ken, JP;
Norio Saitou, Fukushima-Ken, JP;
Mitsuhiro Matsuzaki, Fukushima-Ken, JP;
Kureha Corporation, Tokyo, JP;
Abstract
A polymerizate slurry obtained through a reaction of an alkali sulfide source and an aromatic dihalide compound in an organic polar solvent and comprising polyarylene sulfide particles, a by-produced alkali metal salt and the polar organic solvent, is continuously contacted countercurrently with a washing liquid, thereby continuously and efficiently recovering washed polyarylene sulfide particles. Furthermore, the by-produced alkali metal salt is removed, and the polar organic solvent is recovered, efficiently.