Conductive polymer composition, method of producing the same, and solid electrolytic capacitor

1. A conductive polymer composition comprising:

a conductive polymer; and

a polyanion that includes a hydrophilic group, the polyanion functioning as a dopant of the conductive polymer, wherein

the conductive polymer composition does not comprise a silane coupling agent, and

at least a part of the hydrophilic group of the polyanion is condensed with an epoxy group in a compound with one epoxy group.

2. The conductive polymer composition according to claim 1 , wherein at least a part of the hydrophilic group of the polyanion is converted to a group with a weaker hydrophile property than the hydrophilic group by condensing with the epoxy group.

3. The conductive polymer composition according to claim 1 , wherein

the epoxy group and the hydrophilic group of the polyanion are condensed in a conductive polymer suspension solution that includes the conductive polymer with the polyanion as a dopant and the compound with one epoxy group, and

after the condensation or in a same process as the condensation, a solvent in the conductive polymer suspension solution is evaporated.

4. The conductive polymer composition according to claim 3 , wherein the conductive polymer is thiophene or a thiophene derivative.

5. The conductive polymer composition according to claim 3 , wherein the polyanion is polystyrene sulfonic acid origin.

6. The conductive polymer composition according to claim 3 , wherein the polyanion and the compound with one epoxy group are reacted by heat from 100.degree. C. to 250.degree. C.

7. The conductive polymer composition according to claim 1 , wherein the conductive polymer is thiophene or a thiophene derivative.

8. The conductive polymer composition according to claim 1 , wherein the polyanion is polystyrene sulfonic acid origin.

9. The conductive polymer composition according to claim 1 , wherein the compound with one epoxy group is selected from the group consisting of allyl glycidyl ether, 2-ethylhexyl glycidyl ether, phenyl glycidyl ether, p-tert-buthylphenyl glycidyl ether, N-glycidyl phthalimide, dibromophenyl glycidyl ether, poly(1-5)oxyalkylene(C2-4)phenyl glycidyl ether, poly(1-5)oxyalkylene(C2-4)methylphenyl glycidyl ether, and alkyl(C8-18)polyoxyalkylene glycidyl ether.

10. A method of producing a conductive polymer composition comprising:

preparing a suspension solution, the suspension solution being made by dispersing a conductive polymer with a polyanion as a dopant in water, a polar organic solvent, or a mixture of water and the polar organic solvent;

adding a compound with one epoxy to the suspension solution;

reacting the polyanion with the epoxy group; and

evaporating the solvent in the suspension solution.

11. The method according to claim 10 , wherein the polyanion and the compound with one epoxy are reacted by heat from 100.degree.C to 250.degree. C.

12. A solid electrolytic capacitor that uses a conductive polymer composition to a solid electrolyte layer, the conductive polymer composition comprising:

a conductive polymer; and

a polyanion that includes a hydrophilic group, the polyanion functioning as a dopant of the conductive polymer, wherein

the conductive polymer composition does not comprise a silane coupling agent, and

at least a part of the hydrophilic group of the polyanion is condensed with a epoxy group in a compound with one epoxy group.

13. The solid electrolytic capacitor according to claim 12 , wherein at least a part of the hydrophilic group of the polyanion is converted to a group with a weaker hydrophile property than the hydrophilic group by condensing with the epoxy group.

14. The solid electrolytic capacitor according to claim 12 , wherein

the epoxy group and the hydrophilic group of the polyanion are condensed in a conductive polymer suspension solution that includes the conductive polymer with the polyanion as a dopant and the compound with one epoxy group, and

after the condensation or in a same process as the condensation, a solvent in the conductive polymer suspension solution is evaporated.

15. The solid electrolytic capacitor according to claim 14 , wherein the conductive polymer is thiophene or a thiophene derivative.

16. The solid electrolytic capacitor according to claim 14 , wherein the polyanion is polystyrene sulfonic acid origin.

17. The solid electrolytic capacitor according to claim 12 , wherein the conductive polymer is thiophene or a thiophene derivative.

18. The solid electrolytic capacitor according to claim 12 , wherein the polyanion is polystyrene sulfonic acid origin.