Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Reexamination Certificate
2006-02-14
2006-02-14
Seidleck, James J. (Department: 1711)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
C528S125000, C528S128000, C528S171000, C528S183000, C528S185000, C528S186000, C528S188000, C528S219000, C528S220000, C528S331000, C528S339300, C528S492000, C528S341000
Reexamination Certificate
active
06998464
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 formulawhere the radicals Ar, Ar1and Ar2are 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.
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Brendel Peter
Guth Thomas
Jordt Frauke
Pawlik Jürgen
Tiefenstädter Reiner
Connolly Bove Lodge & Hutz
PEMEAS GmbH
Seidleck James J.
Zemel Irina S.
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