Solid electrolytic capacitor and method for producing the same

A solid electrolytic capacitor, comprising a dielectric film on the surface of a valve-acting metal having fine pores, a solid electrolyte layer, an electrically conducting carbon paste layer and an electrically conducting metal powder paste layer in order, wherein the binder of said electrically conducting carbon paste is allowed to infiltrate into the solid electrolyte layer,

• wherein the solid electrolyte layer comprises an electrically conducting polymer and a monomer for forming said electrically conducting polymer is a compound containing a 5-membered heterocyclic ring,
• wherein the compound containing a 5-membered heterocyclic ring is a compound selected from the group consisting of pyrrole, thiophene, furan, polycyclic sulfide and substitution derivatives thereof, and
• wherein the compound containing a 5-membered heterocyclic ring is a compound represented by the following formula (I):
• wherein the substituents R1 and R2 each independently represents a monovalent group selected from the group consisting of hydrogen, a linear or branched, saturated or unsaturated hydrocarbon group having from 1 to 10 carbon atoms, an alkoxy group, an alkyl ester group, a halogen, a nitro group, a cyano group, a primary, secondary or tertiary amino group, CF3, a phenyl group and a substituted phenyl group;
• the hydrocarbon chains of R1 and R2 may combine with each other at an arbitrary position to form a divalent chain for forming at least one 3-, 4-, 5-, 6- or 7-membered saturated or unsaturated hydrocarbon ring structure together with the carbon atoms to which those hydrocarbon groups are substituted, and said ring connecting chain may arbitrarily contain a bond of carbonyl, ether, ester, amide, sulfido, sulfinyl, sulfonyl or imino.

A solid electrolytic capacitor comprising a dielectric film on the surface of a valve-acting metal having fine pores, a solid electrolyte layer, an electrically conducting carbon paste layer and an electrically conducting metal powder paste layer in order, wherein the binder of said electrically conducting carbon paste is allowed to infiltrate into the solid electrolyte layer and into the inside of the fine pores of the valve-acting metal,

• wherein the solid electrolyte layer comprises an electrically conducting polymer and a monomer for forming said electrically conducting polymer is a compound containing a 5-membered heterocyclic ring,
• wherein the compound containing a 5-membered heterocyclic ring is a compound selected from the group consisting of pyrrole, thiophene, furan, polycyclic sulfide and substitution derivatives thereof, and
• wherein the compound containing a 5-membered heterocyclic ring is a compound represented by the following formula (I):
• wherein the substituents R1 and R2 each independently represents a monovalent group selected from the group consisting of hydrogen, a linear or branched, saturated or unsaturated hydrocarbon group having from 1 to 10 carbon atoms, an alkoxy group, an alkyl ester group, a halogen, a nitro group, a cyano group, a primary, secondary or tertiary amino group, CF3, a phenyl group and a substituted phenyl group;
• the hydrocarbon chains of R1 and R2 may combine with each other at an arbitrary position to form a divalent chain for forming at least one 3-, 4-, 5-, 6 - or 7-membered saturated or unsaturated hydrocarbon ring structure together with the carbon atoms to which those hydrocarbon groups are substituted, and said ring connecting chain may arbitrarily contain a bond of carbonyl, ether, ester, amide, sulfido, sulfinyl, sulfonyl or imino.