A dopant solution for an electroconductive polymer, an oxidant and dopant solution for an electroconductive polymer, an electroconductive composition and a solid electrolytic capacitor

A dopant and oxidant solution for an electroconductive polymer characterized in that it comprises a mixture of at least one selected from the group consisting of an alkylamine salt and an imidazole salt of a benzene skeleton sulfonic acid or a naphthalene skeleton sulfonic acid, having at least one OH group and at least one sulfonate group;

• and a persulfate organic salt is served as an oxidant and dopant, wherein the persulfate organic salt is included at an amount of 0.3 to 2.0 moles, per one mole of the one selected from the group consisting of an alkylamine salt and an imidazole salt of a benzene skeleton sulfonic acid or a naphthalene skeleton sulfonic acid, having at least one OH group and at least one sulfonate group.

An electroconductive composition, wherein a mixture of at least one selected from the group consisting of an alkylamine salt and an imidazole salt of a benzene skeleton sulfonic acid or a naphthalene skeleton sulfonic acid, having at least one OH group and at least one sulfonate group;

• and a persulfate organic salt is served as an oxidant and a dopant;
• and wherein a monomer, selected from the group consisting of thiophene and derivatives thereof, pyrrole and derivatives thereof, and aniline and derivatives thereof, is polymerized.

A method for producing an electroconductive composition, wherein in the presence of an oxidant and dopant of a mixture of at least one selected from the group consisting of an alkylamine salt and an imidazole salt of a benzene skeleton sulfonic acid or a naphthalene skeleton sulfonic acid, having at least one OH group and at least one sulfonate group;

• and a persulfate organic salt, at least one monomer, selected from the group consisting of thiophene and derivatives thereof, pyrrole and derivatives thereof, and aniline and derivatives thereof, is polymerized to prepare an electroconductive composition.

A method for producing an electroconductive composition,

• wherein an oxidant and dopant of a mixture of at least one selected from the group consisting of an alkylamine salt and an imidazole salt of a benzene skeleton sulfonic acid or a naphthalene skeleton sulfonic acid, having at least one OH group and at least one sulfonate group;
• and a persulfate organic salt, is provided in a solution,
• wherein in the presence of the oxidant and the dopant, at least one monomer, selected from the group consisting of thiophene and derivatives thereof, pyrrole and derivatives thereof, and aniline and derivatives thereof, is polymerized to prepare an electroconductive composition.

A solid electrolytic capacitor characterized in using an electroconductive composition as a solid electrolyte,

• wherein the electroconductive composition is obtained by polymerizing a monomer, selected from the group consisting of thiophene and derivatives thereof, pyrrole and derivatives thereof, and aniline and derivatives thereof, in the presence of an oxidant and dopant,
• wherein the oxidant and dopant comprises a mixture of at least one selected from the group consisting of an alkylamine salt and an imidazole salt of a benzene skeleton sulfonic acid or a naphthalene skeleton sulfonic acid, having at least one OH group and at least one sulfonate group;
• and a persulfate organic salt.