A process for preparing an aqueous or non-aqueous solution or dispersion of a
polythiophene
or thiophene copolymer, containing structural units according to formula (I):
##STR1##
in which R1 and R2 independently of one another represent
hydrogen or a C1-5-alkyl group or together form an optionally substituted
C1-5-alkylene residue, comprising the step of: preparing the polythiophene
or thiophene copolymer with an initiator in a reaction medium in the presence of
polyanions under oxidizing or reducing conditions under an inert atmosphere such
that when said initiator is added less than 3 mg of oxygen per litre of the reaction
medium is present in the reaction medium; an aqueous or non-aqueous solution or
dispersion prepared therewith; the use of an aqueous or non-aqueous dispersion
or solution comprising the aqueous or non-aqueous solution or dispersion of a polythiophene
or thiophene copolymer for coating an object; a printable paste containing the
aqueous or non-aqueous solution or dispersion of a polythiophene or thiophene copolymer;
and an electroconductive or an antistatic layer prepared using an aqueous or non-aqueous
solution or dispersion comprising the aqueous or non-aqueous solution or dispersion
of a polythiophene or thiophene copolymer.