Process for producing solution having electrically conductive polymer dispersed therein, and electrolytic capacitor
View Patent ↗A method for producing a conductive polymer dispersion liquid includes preparing an emulsion of a polyanion adsorbed on a conductive polymer precursor monomer by emulsifying a blended liquid obtained by blending the conductive polymer precursor monomer, the polyanion, and an aqueous solvent; and forming a dispersoid of a conductive polymer by chemical oxidative polymerization with addition of an oxidant to the emulsion. Furthermore, by using this conductive polymer dispersion liquid to provide an electrolytic capacitor, the ESR of the capacitor can be reduced.
1. A method for producing a conductive polymer dispersion liquid, the method comprising:
preparing an emulsion of a polyanion adsorbed on a conductive polymer precursor monomer by emulsifying a blended liquid obtained by blending the conductive polymer precursor monomer, the polyanion, and an aqueous solvent; and
forming a dispersoid of a conductive polymer by chemical oxidative polymerization with addition of an oxidant to the emulsion.
2. The method for producing a conductive polymer dispersion liquid according to claim 1 , wherein a peak value of a particle size distribution of micelles in the emulsion is adjusted to less than 1000 nm while preparing the emulsion.
3. The method for producing a conductive polymer dispersion liquid according to claim 1 , the method further comprising adding a polyhydric alcohol to a dispersion of the conductive polymer.
4. An electrolytic capacitor comprising:
an anode foil;
a cathode foil; and
an electrolyte disposed between the anode foil and the cathode foil,
wherein the electrolyte is formed from the conductive polymer dispersion liquid obtained by the production method according to claim 1 .
5. The electrolytic capacitor according to claim 4 further comprising an electrolytic solution.
6. The method for producing a conductive polymer dispersion liquid according to claim 1 ,
wherein the conductive polymer precursor monomer is at least one selected from the group consisting of thiophene and derivatives thereof.
7. A method for producing a conductive polymer dispersion liquid, the method comprising:
preparing an emulsion of a polyanion adsorbed on a conductive polymer precursor monomer by emulsifying a blended liquid obtained by blending the conductive polymer precursor monomer, the polyanion, and an aqueous solvent; and
forming a dispersoid of a conductive polymer by chemical oxidative polymerization with addition of an oxidant to the emulsion,
wherein a peak value of a particle size distribution of micelles in the emulsion is adjusted to less than 1000 nm while preparing the emulsion, and
the emulsion is prepared by a thin-film spinning method.
8. The method for producing a conductive polymer dispersion liquid according to claim 7 , wherein the particle size distribution of the micelles has a peak value of 50 nm or more.