Conductive polymer and solid electrolytic capacitor using same

Abstract

The conductive polymer of the present invention is prepared by means of oxidation polymerization. On the matrix of the conductive polymer, at least one organic sulfonate formed by an anion of an organic sulfonic acid and a cation of other than transition metals is coated. Alternatively, in the matrix of the conductive polymer, at least one organic sulfonate formed by an anion of an organic sulfonic acid and a cation of other than transition metals is included. The conductive polymer of the present invention is excellent in the conductivity, heat resistance and moisture resistance. By using it as a solid electrolyte, a reliable solid electrolytic capacitor can be prepared which is unlikely to decrease the properties when being kept in a hot and humid condition.

1 . (canceled)  
     
     
         2 . A conductive polymer according to  claim 12 , wherein a monomer for the conductive polymer is at least one selected from the group consisting of thiophene, pyrrole and the derivatives thereof.  
     
     
         3 . A conductive polymer according to  claim 12 , wherein the conductive polymer obtained by the oxidation polymerization uses an organic sulfonic acid as a dopant.  
     
     
         4 . A conductive polymer according to  claim 12 , wherein the cation of the organic sulfonate is a metal cation other than a transition metal.  
     
     
         5 . A conductive polymer according to  claim 12 , wherein the cation of the organic sulfonate has a backbone having at least one selected from the group consisting of five-membered heterocyclic ring, benzene ring, naphthalene ring, tetralin ring and anthracene ring, and at least one selected from the group consisting of NH group and NH 2 .  
     
     
         6 . A conductive polymer according to  claim 12 , wherein the anion of the organic sulfonate has a backbone having at least one selected from the group consisting of benzene ring, naphthalene ring, tetralin ring and anthracene ring.  
     
     
         7 . A conductive polymer according to  claim 12 , wherein the anion of the organic sulfonate has a backbone having at least one selected from the group consisting of benzene ring, naphthalene ring, tetralin ring and anthracene ring, wherein the backbone is connected to at least one functional group selected from the group consisting of alkyl group having a carbon number of 1 to 12, hydroxyl group, alkoxy carbonyl group having a carbon number of 2 to 10, alkoxyl group and aldehyde group having a carbon number of 1 to 10, and at least one sulfonic acid group.  
     
     
         8 . A conductive polymer according to  claim 12 , wherein the anion of the organic sulfonate has a backbone having at least one selected from the group consisting of benzene ring, naphthalene ring, tetralin ring and anthracene ring, wherein the backbone is connected to at least one functional group selected from the group consisting of alkyl group having a carbon number of 1 to 12, hydroxyl group, alkoxy carbonyl group having a carbon number of 2 to 10, alkoxyl group and aldehyde group having a carbon number of 1 to 10, and at least one sulfonic acid group, wherein protons of the sulfonic acid are partially replaced with fluorine.  
     
     
         9 . A conductive polymer according to  claim 12 , wherein the organic sulfonate is a mixture of a first organic sulfonate comprising an anion having a backbone having at least one selected from the group consisting of benzene ring, naphthalene ring, tetralin ring and anthracene ring, and hydroxyl group and at least one sulfonic acid; and a second organic sulfonate comprising an anion having a backbone having at least one selected from the group consisting of benzene ring, naphthalene ring, tetralin ring and anthracene ring, an aldehyde group having a carbon number of 1 to 10, and at least one sulfonic acid group.  
     
     
         10 . A conductive polymer according to  claim 12 , wherein the oxidation polymerization is chemical oxidation polymerization, wherein the conductive polymer obtained by the chemical oxidation polymerization comprises a transition metal salt of the organic sulfonic acid serving as a dopant as well as serving as an oxidant.  
     
     
         11 . A solid electrolytic capacitor, wherein the conductive polymer according to  claim 1  is used as a solid electrolyte.  
     
     
         12 . A conductive polymer, comprising a matrix of the conductive polymer and an organic sulfonate coated on or included in the conductive polymer, wherein the conductive polymer is obtained by oxidation polymerization, wherein the organic sulfonate is formed by an anion of an organic sulfonic acid and a cation other than a transition metal.