Patent ID: 7938986

Claim:
A dispersion comprising at least one polymeric anion, at least one solvent and at least one polythiophene having repeating units corresponding to the general formula (I): wherein A in each repeating unit independently represents a substituted or unsubstituted C 1 to C 5 alkylene radical, each R independently represents a linear or branched, substituted or unsubstituted C 1 to C 18 alkyl radical, a substituted or unsubstituted C 5 to C 12 cycloalkyl radical, a substituted or unsubstituted C 6 to C 14 aryl radical, a substituted or unsubstituted C 7 to C 18 aralkyl radical, a substituted or unsubstituted C 1 to C 4 hydroxyalkyl radical or a hydroxyl radical, x in each repeating unit independently represents a whole number from 0 to 8, wherein the at least one polymeric anion and the at least one polythiophene are present in a weight ratio of 1:1 to 5:1, wherein the dispersion has a viscosity of 5 to 300 mPas, and wherein 50 wt. % of particles in the dispersion are smaller than 50 nm, such that a film produced from the dispersion has an electrical conductivity of at least 300 S/cm and a surface roughness Ra of less than 2.5 nm.