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:
Jan. 23, 1990
Filed:
Jun. 25, 1987
Katsuhiro Abe, Mie, JP;
Kazunori Yano, Mie, JP;
Ryuhei Matsui, Mie, JP;
Shigeki Kiriyama, Mie, JP;
Yoshiharu Tatsukami, Osaka, JP;
Kenji Nagaoka, Osaka, JP;
Mitsubishi Petrochemical Co., Ltd., Tokyo, JP;
Sumitomo Chemical Company, Ltd., Osaka, JP;
Abstract
A process for producing a polyphenylene ether is disclosed, comprising oxidatively polymerizing a phenol in an organic solvent in the presence of a catalyst for oxidative polymerization, finely dispersing the resulting polyphenylene ether containing the organic solvent in an aqueous dispersion medium containing an acid compound, and heating the aqueous dispersion to remove the solvent from the polyphenylene ether. The resulting polyphenylene ether has excellent powder properties and contains a reduced amount of a catalyst residue.