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:
Jul. 31, 1984
Filed:
Feb. 15, 1983
Applicant:
Inventors:
William O Dalton, Parkersburg, WV (US);
Michael K Rinehart, Parkersburg, WV (US);
Akitoshi Sugio, Tokyo, JP;
Assignee:
Borg-Warner Chemicals, Inc., Parkersburg, WV (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08G / ;
U.S. Cl.
CPC ...
528212 ; 526 68 ; 526 69 ; 526 70 ; 528 86 ; 528214 ; 528215 ; 528217 ; 528486 ; 528487 ; 528490 ; 528496 ; 528499 ; 528502 ;
Abstract
An improved method for the production of polyphenylene ethers is disclosed. The method comprises oxidatively coupling monohydric phenols in the presence of a complex catalyst and in a liquid medium which is a solvent for the monomer and catalyst and a non-solvent for the polyphenylene ether. The polyphenylene ether precipitates to form a slurry of particulate solids which is then washed with an aqueous solution of a chelating agent to remove catalyst residue.