Polythiophene/polyanion compositions

Abstract

A conductive polymer dispersion comprising a polythiophene and a polyanion, characterized in that the polyanion is a homo- or copolymer of a monomer unit according to Formula (I), wherein any of Rto Ris selected from the group consisting of hydrogen, a halogen, an ether and a substituted or unsubstituted alkyl group with the proviso that at least one of Rto Ris a substituent according to Formula (II), wherein L represents a divalent linking group having less than (20) carbon atoms; n represents 0 or 1; Rand Rare independently selected from the group consisting of hydrogen, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted alkynyl group, a substituted or unsubstituted aralkyl group, a substituted or unsubstituted alkaryl group and a substituted or unsubstituted aryl or heteroaryl group; any of L, Rand Rmay represent the necessary atoms to form a 5 to 8 membered ring; M represents hydrogen or a counterion to compensate the negative charge of the sulfonate group; the dashed line represents a covalent bond to the phenyl ring of Formula (I).