Patent ID: 6987663

Claim:
An electrolytic capacitor comprising: (a) a porous electrode body comprising an electrode material, said porous electrode body having a surface; (b) a dielectric material covering the surface of the porous electrode body, said dielectric material having a surface; (c) a solid electrolyte comprising a conductive material preferably a conductive polymer that at least partially covers the surface of said dielectric material, said solid electrolyte having a surface; (d) a layer covering the entire external surface or a portion of the external surface of the porous electrode body thereby covering at least a portion of the surface of said solid electrolyte and optionally a portion of the surface of said dielectric material, said layer comprising at least one polymeric anion, and at least one member selected from the group consisting of polyaniline, optionally substituted poylaniline and polythiophene, said polythiophene having recurring units selected from the group consisting of general formula (I), general formula (II) and combinations thereof, wherein A represents a member selected from the group consisting of C 1 to C 5 alkylene radical and C 1 to C 5 alkylene radical substituted with at least one member selected from the group consisting of alkyl, cycloalkyl, aryl, halogen, ether, thioether, disulphide, sulphoxide, sulphone, sulphonate, amino, aldehyde, keto, carboxylic acid ester, carboxylic acid, carbonate, carboxylate, cyano, alkylsilane, alkoxysilane and carboxylamide, R represents a member selected from the group consisting of linear or branched C 1 to C 18 alkyl radical, C 5 to C 12 cycloalkyl radical, C 6 to C 14 aryl radical, C 7 to C 18 aralkyl radical, C 1 to C 4 hydroxyalkyl radical and hydroxyl radical, x represents an integer from 0 to 8, and provided that if x is at least 2, each R may be the same or different, wherein layer (d) further comprises at least one binder.