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:
Sep. 29, 1987
Filed:
Nov. 14, 1985
Hermann Brandt, Schifferstadt, DE;
Hermann Fischer, Limburgerhof, DE;
Hermann Dreher, Seeheim-Jugenheim, DE;
Eduard Heil, Limburgerhof, DE;
Juergen Hambrecht, Heidelberg, DE;
Herbert Naarmann, Wattenheim, DE;
Adolf Echte, Ludwigshafen, DE;
Hermann Gausepohl, Mutterstadt, DE;
Peter Siebel, Limburgerhof, DE;
Johann Swoboda, Ludwigshafen, DE;
Gerd Schwoebel, Wattenheim, DE;
Albert Nikles, Ludwigshafen, DE;
BASF Aktiengesellschaft, Ludwigshafen, DE;
Abstract
Polyphenylene ethers are prepared from monohydric phenols, which possess alkyl substituents in the two ortho-positions and, if desired, in the meta-position, but not in the para-position, by an oxidative coupling reaction with oxygen at from 15.degree. to 50.degree. C. and under from 1 to 10 bar in the presence of a catalyst complex, of a solvent and, if required, of an activator, by a method in which the conversion of the phenols is carried out in two more reaction zones, in which some or all of the solvent, the catalyst complex and the phenols and, where relevant, the activator is initially taken and is circulated by means of a conveying unit, and about 60-100% of the stoichiometric amount of oxygen required for the oxidative coupling is introduced into the first reaction zone and from 0 to about 40% of the said stoichiometric amount is introduced into the second reaction zone.