TECHNOLOGY FOCUS - POLYMERS - Preferred Method: Stage (b) involves removing water by distillation, after which the dispersion or solution may be diluted with organic solvent(s). The aqueous dispersions or solutions used as starting material may be completely or partly freed from inorganic salts, preferably resulting in final dispersions or solutions with a water content of 0-5 wt% and an inorganic salt content which is less than 40% of the amount originally used for oxidative polymerisation of the monomer(s).    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Solvents: Amide solvents (e.g. dimethylacetamide, N-methylpyrrolidone), alcohols (e.g. ethylene glycol, glycerol), ethers (e.g. dioxan). Preferred Definitions:    Y = -(CH2)mCR1R2(CH2)n- or 1,2-cyclohexylene, with R1, R2 = H, hydroxymethyl, 1-8C alkyl or phenyl, m and n = 0 or 1 and An = anions of polyacrylic, polyvinylsulfonic, polystyrenesulfonic acids (or copolymers of the corresponding monomers or copolymers with non-acid monomers); or    Y = 1,2-ethylene with An = anions of polystyrenesulfonic acids.    Z = -(CH2)m-CR1R2-(CH2)n-; R3 = H;    R4 = -(CH2)sO(CH2)pSO3- M+; m = 0-3, preferably 1;    n = 0-3, preferably 0 or 1;    s = 0, 1 or 2, preferably 0 or 1;    p = 4 or 5, preferably 4.    EXAMPLE - A mixture of 20 g polystyrenesulfonic acid (mol. wt. 40000), 21.4 g potassium perdisulfate, 50 mg iron(III) sulfate and 2 l water was treated with 8 g 3,4-ethylenedioxy-thiophene, stirred for 24 hours at room temperature (RT), mixed with 100 g Lewatit MP 62 (RTM: anion exchange resin) and 100 g Lewatit S 100 (RTM: cation exchange resin), stirred for 8 hours and worked up by filtration to give a solution (A) of ionic polythiophene complex with a solid content of 1.2 wt%. 100 g solution (A) was treated over 15 minutes with 200 g dimethylacetamide (DMA) and then distilled at 40degreesC and 18 mbar to give 122 g DMA/water mixture and a residual solution (B) with a water content of 3.9% and a solid content of 0.8%. A mixture of 10 g solution (B) and 5 g ethanol was coated onto polyester film in a wet film thickness of 24 microns and then dried for 15 min at 60degreesC. This gave a clear, transparent coating with a surface resistance of 4200 ohms/cm2; dilutions containing 10 g (B) with 10, 50 or 100 g ethanol gave coatings with resistance values of 68 x 103, 895 x 103 and 3.6 x 107 ohms/cm2 respectively.