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:
Mar. 21, 2017
Filed:
Apr. 22, 2014
Martin Roos, Haltern am See, DE;
Jürgen Herwig, Hünxe, DE;
Kévin Micoine, Herten, DE;
Frank Weinelt, Billerbeck, DE;
Martin Roos, Haltern am See, DE;
Jürgen Herwig, Hünxe, DE;
Kévin Micoine, Herten, DE;
Frank Weinelt, Billerbeck, DE;
Evonik Degussa GmbH, Essen, DE;
Abstract
The invention relates to a method for the purification of poly(arylene ethers) of formula (I) in which m=0 to 1.0, n=1.0-m, and Ar, Ar, Arand Arindependently represent divalent arylene groups. The compound of formula (I) is produced in a first step 1, with a raw product being obtained by bringing a metal or ammonium salt of divalent dihydroxy derivatives of Aror Arinto contact with one or more dihalogenated derivatives of Arand/or Ar, in the presence of a solvent LM1. A precipitate that is present, if appropriate, is separated (step B) so as to obtain a solution L which then undergoes a membrane filtration (step C).