Substituted polyalkylene dioxythiophene as solid state electrolyte in electrolyte capacitors

Use is claimed of substituted poly(alkylenedioxythiophenes) as solid electrolytes in electrolytic capacitors. Use is claimed of substituted poly(alkylenedioxythiophenes) with repeating units of formula (I) as solid electrolytes in electrolytic condensers. [Image] A : 1-5C alkylene optionally linked via linker L to -OR and optionally further substituted; L : methylene; x : 0 or an integer 1 or greater; and R : H, optionally SO 3H-, SO 3-, COOH- or COO ->-substituted 1-18C alkyl, 7-18C aralkyl, 5-14C aryl or 5-12C cycloalkyl Independent claims are also included for the following: (1) an electrolytic condenser containing a layer of oxidizable metal, an oxide layer of the metal, contacts and also a solid electrolyte containing a substituted poly(alkylenedioxythiophene) with repeating units of formula (I); (2) production of the condenser by (i) applying a thiophene of formula (II), an oxidant and optionally a counterion together or sequentially and optionally in solution form onto an oxidic layer of a metal and chemically polymerizing at -10 to 250[deg]C or (ii) applying a thiophene of formula (II) and counterions (optionally from solution) onto an oxidic layer of a metal and electrochemically polymerizing at -78 to 250[deg]C; and (3) an electroconductive layer with a specific conductivity >=150 S/cm obtained by the above methods. [Image].