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:
Nov. 23, 2010
Filed:
May. 24, 2007
Kiyonari Hiramatsu, Yokkaichi, JP;
Yoshio Mukai, Yokkaichi, JP;
Hidemi Hirashima, Yokkaichi, JP;
Yuji Takeda, Yokkaichi, JP;
Kiyonari Hiramatsu, Yokkaichi, JP;
Yoshio Mukai, Yokkaichi, JP;
Hidemi Hirashima, Yokkaichi, JP;
Yuji Takeda, Yokkaichi, JP;
Mitsubishi Gas Chemical Company, Inc., Tokyo, JP;
Abstract
A process for producing a phenylene ether oligomer comprising oxidative polymerization of a specific bivalent phenol compound and a specific monovalent phenol compound in an aromatic hydrocarbon solvent, wherein the aromatic hydrocarbon solvent of a phenylene ether oligomer solution obtained after the termination of the polymerization is replaced with a water-soluble organic solvent having a boiling point higher than that of the aromatic hydrocarbon solvent and the resultant phenylene ether oligomer solution is brought into contact with water, thereby precipitating the phenylene ether oligomer as particles.