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:
Dec. 11, 2012
Filed:
Feb. 27, 2008
Shunsuke Horiuchi, Nagoya, JP;
Kohei Yamashita, Nagoya, JP;
Kayo Tsuchiya, Nagoya, JP;
Koji Yamauchi, Nagoya, JP;
Shunsuke Horiuchi, Nagoya, JP;
Kohei Yamashita, Nagoya, JP;
Kayo Tsuchiya, Nagoya, JP;
Koji Yamauchi, Nagoya, JP;
Toray Industries, Inc., Tokyo, JP;
Abstract
A method for producing a cyclic polyarylene sulfide, wherein a cyclic polyarylene sulfide is produced by heating a reaction mixture which is composed of at least a linear polyarylene sulfide (a), a sulfidizing agent (b), a dihalogenated aromatic compound (c) and an organic polar solvent (d). This method for producing a cyclic polyarylene sulfide is characterized in that not less than 1.25 liters of the organic polar solvent is used per 1 mole of the sulfur content in the reaction mixture. This method enables to efficiently produce a cyclic polyarylene sulfide, more specifically cyclic oligoarylene sulfide by an economical and simple process in short time.