| abstract |
The present invention relates to: I) providing a composition Z1 comprising a thiophene monomer and an oxidant; II) reducing the oxidant to a reduction product and oxidatively polymerizing the thiophene monomer by oxidation of the thiophene monomer to form a composition Z2 comprising polythiophene and a reduction product; III) at least partially removing said reduction product from said composition Z2 obtained in process step II) to obtain composition Z3; Wherein the composition Z3 relates to a process for the preparation of a composition comprising polythiophene having a sulfate content in the range of 100 ppm to 1,000 ppm, based on the total weight of the composition Z3. The invention also relates to a composition obtainable as the composition Z3 prepared by the above method, a composition comprising polythiophene, a layer structure, an electronic device, and the use of the composition. |