Method for producing a solution consisting of a polymer containing recurrent azole units, solutions produced according to said method and use of the same

US6998464B2 · kind B2 · utility

Assignee

• Pemeas GmbH · DE

Inventors

• Thomas Guth · Endicott, US
• Jürgen Pawlik · Frankfurt, DE
• Reiner Tiefenstädter · Rosbach, DE
• Peter Brendel · Neu-Anspach, DE
• Frauke Jordt · Eppstein, DE

Key dates

• Filing date: Oct 20, 2001
• Grant date: Feb 14, 2006
• Expiry date: Oct 20, 2021

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P70/50
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

The present invention relates to a method of preparing a solution of a polymer comprising recurring azole units, which comprises dissolving a sufficiently dried polymer comprising recurring azole units of the formula where the radicals Ar, Ar1 and Ar2 are tetravalent, divalent or trivalent aromatic or heteroaromatic groups and the radicals X, which are identical within a repeating unit, are each an oxygen atom, a sulfur atom or an amino group bearing a hydrogen atom, a group having 1–20 carbon atoms, preferably a branched or unbranched alkyl or alkoxy group, or an aryl group as further radical, in N,N-dimethylacetamide having a sufficiently low water content at a temperature above room temperature under an inert gas atmosphere, wherein a sufficiently dried polymer comprising recurring azole units of the formula (1) or (2) of which 90% by weight based on the total weight of the polymer comprising recurring azole units has a particle size of less than 1 mm is used.