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:
Oct. 01, 2013
Filed:
Aug. 26, 2010
Takeshi Unohara, Nagoya, JP;
Hiroyuki Isago, Nagoya, JP;
Toru Nishimura, Nagoya, JP;
Masahiro Inohara, Nagoya, JP;
Takeshi Unohara, Nagoya, JP;
Hiroyuki Isago, Nagoya, JP;
Toru Nishimura, Nagoya, JP;
Masahiro Inohara, Nagoya, JP;
Toray Industries, Inc., Tokyo, JP;
Abstract
A method is provided for producing a polyarylene sulfide by reacting a sulfidizing agent with a dihalogenated aromatic compound in an organic polar solvent in the presence of an alkali metal hydroxide, the method includes <Step 1>: carrying out the reaction in such a manner that the polymerization time in a temperature range of 230° C. to less than 245° C. (T1a) is not less than 30 minutes and less than 3.5 hours and that the conversion ratio of the dihalogenated aromatic compound at the end of the step is 70 to 98 mol. % and <Step 2>: carrying out the reaction in such a manner that the polymerization time in a temperature range of 245° C. to less than 280° C. (T2) is not less than 5 minutes and less than 1 hour.