Abstract: A method of producing a solid electrolytic capacitor, including a step of forming a dielectric film on the surface of a valve-acting metal having fine pores and a step of forming a solid electrolyte layer containing a conductive polymer on the dielectric film; wherein the solid electrolyte layer containing the conductive polymer is formed without using an oxidizing agent by: (i) a method of polymerizing at least one of the compounds (A1) represented by formula (1) disclosed herein in the presence of a compound (B) having a sulfo group; (ii) a method of copolymerizing at least one compound (A2) represented by formula (2) disclosed herein; and (iii) a method of polymerizing at least one of the compounds (A1) and (A2).

Abstract: A method of producing a solid electrolytic capacitor, including a step of forming a dielectric film on the surface of a valve-acting metal having fine pores and a step of forming a solid electrolyte layer containing a conductive polymer on the dielectric film; wherein the solid electrolyte layer containing the conductive polymer is formed without using an oxidizing agent by: (i) a method of polymerizing at least one of the compounds (A1) represented by formula (1) disclosed herein in the presence of a compound (B) having a sulfo group; (ii) a method of copolymerizing at least one compound (A2) represented by formula (2) disclosed herein; and (iii) a method of polymerizing at least one of the compounds (A1) and (A2).

Abstract: A method of producing a niobium granulated powder, including the steps of: mixing niobium hydride and a metal oxide by a mechanical alloying method to produce a mechanical alloy; pulverizing the mechanical alloy; subjecting the pulverized mechanical alloy to heat treatment to allow the pulverized mechanical alloy to aggregate, to thereby form a granulated product. Also disclosed is a sintered body of the niobium granulated powder, an anode body produced from the sintered body and a capacitor including the sintered body.

Abstract: A chemical conversion body obtained from a niobium granulated product being porous and having high binding strength, an electrolytic capacitor including the chemical conversion body and a production method thereof. The capacitor includes a chemical conversion body which has a dielectric layer on its surface and a metal element other than niobium distributed therein so that the metal element surrounds niobium; and a cathode formed on the dielectric layer on the surface of the chemical conversion body. The chemical conversion body is produced by mixing niobium hydride and a compound containing a metal element other than niobium; and subjecting the mixture to heat treatment at a temperature higher than a diffusion starting temperature of the compound containing a metal element other than niobium to obtain a niobium granulated product; sintering the granulated product; and subjecting the sintered body to electrolytic oxidation to form a dielectric layer on its surface.

Abstract: A chemical conversion body, electrolytic capacitor and production method are disclosed. The capacitor contains a chemical conversion body obtained by sintering a niobium granulated product. The sintered product is obtained by mixing niobium hydride and a niobium-aluminum intermetallic compound, pulverizing the mixture, and allowing the mixture to agglomerate by heat treatment to thereby form a granulated product; sintering the granulated product; and subjecting the sintered body to electrolytic oxidation to form a dielectric layer on the surface of the sintered body; in which chemical conversion body the sites of aluminum localization having a size of 0.1 ?m to 0.5 ?m are scattered in a depth of less than 0.06 ?m from the surface of the dielectric layer. Nb2Al and Nb3Al can be preferably used as a niobium-aluminum intermetallic compound.

Abstract: A capacitor element is obtained by chemically converting an anode body comprising a niobium or niobium alloy in an electrolyte solution, which is obtained by dissolving an oxygen supply agent such as hydrogen peroxide, a freezing point depressant such as ethylene glycol, and an electrolyte such as phosphoric acid in water, at a solution temperature lower than the freezing point of a solution having the composition of the electrolyte solution excluding the freezing point depressant, for forming a dielectric layer in the surface of the anode body or repairing a dielectric layer formed in the surface of the anode body. An electrolytic capacitor is obtained by forming a cathode on the dielectric layer of the capacitor element, electrically connecting the anode body and the cathode respectively to external terminals, and then sealing them.

Abstract: The present invention relates to a method to produce a solid electrolytic capacitor by forming a dielectric layer on an anode body comprising a valve-acting metal sintered body having fine pores and forming on the dielectric layer a conductive compound layer to form a cathode, wherein a cathode is formed by repeating the step of dipping the anode body into an inorganic compound solution, an organic compound solution or a conductive-polymer compound dispersion liquid which turns into a conductive compound layer to thereby laminate a conductive layer on the anode body, and the depth of the anode body to be dipped is increased with each dipping; and an apparatus to be used for the method. According to the present invention, a satisfactory cathode layer can be efficiently formed and a solid electrolytic capacitor having a large capacitance and a low equivalent series resistance can be produced.

Abstract: A surface layer of an anode body containing niobium is converted into a dielectric layer by a method for a chemical formation, which comprises step I of electrolytically forming an anode body comprising niobium in a chemical forming solution containing nitric acid and phosphoric acid at a temperature within a range from 40° C. to a boiling point of the chemical forming solution, step II of heat-treating the electrolytically formed anode body at a temperature within a range from 150° C. to 300° C., and step III of electrolytically forming the heat-treated anode body in a chemical forming solution containing nitric acid and phosphoric acid at a temperature within a range from 40° C. to a boiling point of the chemical forming solution. A cathode is formed on the dielectric layer to obtain a solid electrolytic capacitor element, and the element is sheathed to obtain a solid electrolytic capacitor.

Abstract: The present invention relates to a method for producing a niobium solid electrolytic capacitor using niobium as an anode body, which comprises a step of chemically converting the anode, wherein the chemical conversion step comprises a first chemical conversion step of forming a chemical conversion coating of the anode, a step of heating the anode body having been subjected to the first chemical conversion step, and a second chemical conversion step of once again chemically converting the heated anode body; wherein electrolytic chemical conversion is performed in the first chemical conversion step and the second chemical conversion step using a chemical conversion liquid, which contains a metal nitrate salt as an electrolyte, at a temperature from 40° C. to the boiling point of the solvent; and wherein the heating step is performed at a temperature of 150 to 300° C.

Abstract: A capacitor element is obtained by chemically converting an anode body comprising a niobium or niobium alloy in an electrolyte solution, which is obtained by dissolving an oxygen supply agent such as hydrogen peroxide, a freezing point depressant such as ethylene glycol, and an electrolyte such as phosphoric acid in water, at a solution temperature lower than the freezing point of a solution having the composition of the electrolyte solution excluding the freezing point depressant, for forming a dielectric layer in the surface of the anode body or repairing a dielectric layer formed in the surface of the anode body. An electrolytic capacitor is obtained by forming a cathode on the dielectric layer of the capacitor element, electrically connecting the anode body and the cathode respectively to external terminals, and then sealing them.

Abstract: The present invention relates to a method for producing a niobium solid electrolytic capacitor using niobium as an anode body, which comprises a step of chemically converting the anode, wherein the chemical conversion step comprises a first chemical conversion step of forming a chemical conversion coating of the anode, a step of heating the anode body having been subjected to the first chemical conversion step, and a second chemical conversion step of once again chemically converting the heated anode body; wherein electrolytic chemical conversion is performed in the first chemical conversion step and the second chemical conversion step using a chemical conversion liquid, which contains a metal nitrate salt as an electrolyte, at a temperature from 40° C. to the boiling point of the solvent; and wherein the heating step is performed at a temperature of 150 to 300° C.

Abstract: The present invention relates to a method to produce a solid electrolytic capacitor by forming a dielectric layer on an anode body comprising a valve-acting metal sintered body having fine pores and forming on the dielectric layer a conductive compound layer to form a cathode, wherein a cathode is formed by repeating the step of dipping the anode body into an inorganic compound solution, an organic compound solution or a conductive-polymer compound dispersion liquid which turns into a conductive compound layer to thereby laminate a conductive layer on the anode body, and the depth of the anode body to be dipped is increased with each dipping; and an apparatus to be used for the method. According to the present invention, a satisfactory cathode layer can be efficiently formed and a solid electrolytic capacitor having a large capacitance and a low equivalent series resistance can be produced.

Abstract: The invention provides a valve-acting metal sintered body for anode of a solid electrolytic capacitor, having a high capacitance, well impregnated with cathode material, and exhibiting excellent properties particularly when having a large volume, a capacitor having a low ESR, an excellent tan ? value and good long-term reliability such as moisture resistance and heat resistance by using the sintered body, and a production method therefor comprising the following steps: coating/printing/shaping a granulated product of a mixed dispersion containing a pore-forming agent, an organic binder and a primary powder or secondary aggregated powder of at least one member selected from valve-acting metal, a valve-acting metal compound and a valve-acting metal alloy or a granulated powder thereof, and a solvent, or compressing and shaping the granulated product of a mixture obtained by removing the solvent from the dispersion; sintering the shaped article containing a pore-forming agent; and removing the pore-forming agent

Abstract: Solder metal consists essentially of 8.8 to 5.0 mass % of Zn, 0.05 to 0 mass % of Bi and the balance of Sn and unavoidable impurities.

Abstract: The invention provides a valve-acting metal sintered body for anode of a solid electrolytic capacitor, having a high capacitance, well impregnated with cathode material, and exhibiting excellent properties particularly when having a large volume, a capacitor having a low ESR, an excellent tan ? value and good long-term reliability such as moisture resistance and heat resistance by using the sintered body, and a production method therefor comprising the following steps: coating/printing/shaping a granulated product of a mixed dispersion containing a pore-forming agent, an organic binder and a primary powder or secondary aggregated powder of at least one member selected from valve-acting metal, a valve-acting metal compound and a valve-acting metal alloy or a granulated powder thereof, and a solvent, or compressing and shaping the granulated product of a mixture obtained by removing the solvent from the dispersion; sintering the shaped article containing a pore-forming agent; and removing the pore-forming agent

Abstract: Solder metal consists essentially of 8.8 to 5.0 mass % of Zn, 0.05 to 0 mass % of Bi and the balance of Sn and unavoidable impurities.

Abstract: A solder powder comprises solder particles having a distribution such that the number of particles having a particle diameter of 20 ?m or less is 30% or less, wherein the oxygen content is 500 ppm or less. A flux for solder paste comprises an organic acid component consisting of an organic acid ester and an ester decomposer catalyst, an organic halogen compound, a reducing agent and a resin component. A solder paste mainly comprises a flux and a solder powder, wherein the water content of the solder paste is 0.5% by weight or less.

Abstract: A solder powder comprises solder particles having a distribution such that the number of particles having a particle diameter of 20 &mgr;m or less is 30% or less, wherein the oxygen content is 500 ppm or less. A flux for solder paste comprises an organic acid component consisting of an organic acid ester and an ester decomposer catalyst, an organic halogen compound, a reducing agent and a resin component. A solder paste mainly comprises a flux and a solder powder, wherein the water content of the solder paste is 0.5% by weight or less.

Abstract: A solder powder comprises solder particles having a distribution such that the number of particles having a particle diameter of 20 &mgr;m or less is 30% or less, wherein the oxygen content is 500 ppm or less. A flux for solder paste comprises an organic acid component consisting of an organic acid ester and an ester decomposer catalyst, an organic halogen compound, a reducing agent and a resin component. A solder paste mainly comprises a flux and a solder powder, wherein the water content of the solder paste is 0.5% by weight or less.