Conductive material formulation and use thereof
The invention pertains to a conductive material formulation comprising: (a) a conductive polymer material; and (b) an insulation material, wherein the conductive polymer material is derived from a conductive polymer and a polyanion and has a weight average molecular weight ranging from 3,000 to 30,000; and wherein the (b) insulation material is present in an amount of 0.01 part to 200 parts by weight based on 100 parts by weight of the (a) conductive polymer material. The conductive material formulation according to the invention is useful for the preparation of solid capacitors.
1. A solid capacitor produced by a process comprising
(a) forming a capacitor assembly comprising an anode, a cathode and a dielectric layer formed on the anode;
(b) providing a conductive material formulation comprising a plurality of separate components including:
(i) a first solution comprising a conductive polymer material, and
(ii) a second solution comprising an insulation material,
wherein the conductive polymer material is derived from a conductive polymer and polyanion, wherein the conductive polymer comprises a polymerization unit derived from a monomer of formula (I):
wherein
A is C 1 to C 4 alkylene substituted with (R) p ,
X is O or S,
R is H, unsubstituted or substituted C 1 to C 20 alkyl or alkoxy, or unsubstituted or substituted C 6 to C 20 aryl, and
p is 0, 1 or 2, and
the conductive polymer has a weight average molecular weight in the range of 3,000 to 30,000,
wherein the (ii) insulation material is selected from the group consisting of an inorganic oxide, a non-conjugated polymer and a combination thereof, the inorganic oxide is selected from the group consisting of titanium dioxide, alumina, zinc oxide, indium tin oxide and silica, and the non-conjugated polymer is selected from the group consisting of epoxy monomer, epoxy oligomer, epoxy resin, polyethylene, polypropylene, polyvinyl alcohol, polyvinyl chloride, polyurethane, polyimide, carboxymethyl cellulose, polyethylene glycol, polyacrylamide and polytetrafluoroethene (Teflon); and
wherein the (ii) insulation material has a content of about 0.01 to about 50 parts by weight, based on 100 parts by weight of the (i) conductive polymer material;
(c) immersing the capacitor assembly in the second solution of the conductive material formulation and heating to drying to form insulation material layers respectively on the cathode and the dielectric layer; and
(d) immersing the capacitor assembly with the insulation material layers in the first solution of the conductive material formulation and heating to drying to form a conductive polymer material layer between the insulation material layers.
2. A solid capacitor produced by a process comprising
(a) forming a capacitor assembly comprising an anode, a cathode and a dielectric layer formed on the anode;
(b) providing a conductive material formulation comprising a plurality of separate components including:
(i) a first solution comprising a conductive polymer material, and
(ii) a second solution comprising an insulation material,
wherein the conductive polymer material is derived from a conductive polymer and polyanion, wherein the conductive polymer comprises a polymerization unit derived from a monomer of formula (I):
wherein
A is C 1 to C 4 alkylene substituted with (R) p ,
X is O or S,
R is H, unsubstituted or substituted C 1 to C 20 alkyl or alkoxy, or unsubstituted or substituted C 6 to C 20 aryl, and
p is 0, 1 or 2, and
the conductive polymer has a weight average molecular weight in the range of 3,000 to 30,000,
wherein the (ii) insulation material is selected from the group consisting of an inorganic oxide, a non-conjugated polymer and a combination thereof, the inorganic oxide is selected from the group consisting of titanium dioxide, alumina, zinc oxide, indium tin oxide and silica, and the non-conjugated polymer is selected from the group consisting of epoxy monomer, epoxy oligomer, epoxy resin, polyethylene, polypropylene, polyvinyl alcohol, polyvinyl chloride, polyurethane, polyimide, carboxymethyl cellulose, polyethylene glycol, polyacrylamide and polytetrafluoroethene (Teflon); and
wherein the (ii) insulation material has a content of about 0.01 to about 50 parts by weight, based on 100 parts by weight of the (i) conductive polymer material;
(c) immersing the capacitor assembly in the first solution of the conductive material formulation and heating to drying to form conductive polymer layers respectively on the cathode and the dielectric layer; and
(d) immersing the capacitor assembly with conductive polymer layers in the second solution of the conductive material formulation and heating to drying to form an insulation material layer between the conductive polymer layers.