An aqueous dispersion of a copolymer of at least one 3,4-alkylenedioxythiophene
compound with a solubility in water at 25 C. of less than 2.2 g/L with at
least one 3,4-alkylenedioxythiophene compound with a solubility in water at 25
C. of at least 2.2 g/L and a polyanion; a preparation process therefor; its use
for coating; a printing ink containing the aqueous dispersion; an electro-conductive
layer containing a copolymer of at least one 3,4-alkylenedioxythiophene compound
with a solubility in water at 25 C. of less than 2.2 g/L with at least one
3,4-alkylenedioxythiophene compound with a solubility in water at 25 C. of
at least 2.2 g/L and a polyanion derived from an aqueous dispersion thereof; and
an antistatic layer containing a copolymer of at least one 3,4-alkylenedioxy-thiophene
compound with a solubility in water at 25 C. of less than 2.2 g/L with at
least one 3,4-alkylenedioxythiophene compound with a solubility in water at 25
C. of at least 2.2 g/L and a polyanion derived from an aqueous dispersion thereof.