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:
May. 12, 2020
Filed:
Sep. 30, 2016
Kureha Corporation, Tokyo, JP;
Akihiro Konno, Tokyo, JP;
Ken-Ichi Takaki, Tokyo, JP;
Haruki Mokudai, Tokyo, JP;
Hiroyuki Sato, Tokyo, JP;
KUREHA CORPORATION, Tokyo, JP;
Abstract
The present invention is to provide a method that can produce polyarylene sulfide having a high viscosity at a high yield. The method of producing polyarylene sulfide according to an embodiment of the present invention includes: a preparation step of preparing a mixture containing an organic amide solvent, a sulfur source, a dihalo aromatic compound, and an alkali metal hydroxide; a first-stage polymerization step of initiating a polymerization reaction by heating the mixture and producing a prepolymer until a pH of a reaction system reaches a range of 10 to 11; and a second-stage polymerization step of continuing the polymerization reaction.