Patent ID: 7259228

Claim:
A method for the preparation of a precursor polymer having the general formula: wherein Ar is an aromatic divalent group or a heteroaromatic divalent group, wherein R 0 is selected from the group consisting of an amino group —NR 1 R 2 , an aryloxy group, an alkyl group, an aryl group, an alkylaryl group, an arylalkyl group, a thioether group, an ester group and an acid carboxylic group, and wherein R 3 and R 4 are independently from each other hydrogen or an organic group selected from the group consisting of a C 1 -C 20 -alkyl group, a cyclic C 3 -C 20 -alkyl group, aryl groups, alkylaryl groups, arylalkyl groups aid heterocyclic groups, said method comprising the steps of: providing a monomer having the general formula: wherein Ar is an aromatic divalent group or an heteroaromatic divalent group, wherein R 0 is selected from the group consisting of an amino group —NR 1 R 2 , an aryloxy group, an alkyl group, an aryl group, an alkylaryl group, an arylalkyl group, a thioether group, an ester group, and an acid carboxylic group, wherein R 1 and R 2 are independently from each other an organic group selected from the group consisting of a C 1 -C 20 -alkyl group, a cyclic C 3 -C 20 -alkyl group, an aryl group, an alkylaryl group, an arylalkyl group and a heterocyclic group, and wherein R 1 and R 2 may be linked together to form a cycle; and reacting said monomer with a basic compound in the presence of an organic solvent to obtain said precursor polymer, wherein an amount of said basic compound is from 1 to 2 equivalents with respect to the monomer.