PROCESS FOR PRODUCING AQUEOUS DISPERSION OF COMPOSITE OF POLY(3,4-DIALKOXYTHIOPHENE) WITH POLYANION

摘要

A process for producing an aqueous dispersion which contains a conductive polymer ingredient and is capable of forming a thin conductive film excellent in transparency and conductivity; and an aqueous dispersion obtained by the process. The process comprises a step in which a 3,4-dialkoxythiophene is polymerized in an aqueous medium in the presence of a polyanion with the aid of an oxidizing agent. In this step, the oxidizing agent is added by dropping a solution or dispersion of the oxidizing agent into the reaction mixture. Alternatively, the concentration of alkali metal ions in the reaction mixture in the polymerization step is kept at 400 ppm or lower.