A separator for aluminum electrolytic capacitors, the separator being interposed between a pair of electrodes in an aluminum electrolytic capacitor that includes a conductive polymer as a cathode material, where: the separator is composed of fibrillated cellulose fibers and fibrillated synthetic fibers; and a tensile strength decrease rate as expressed by formula (1) with use of a tensile strength after 30-minute humidity control at 20° C. at 65% RH and a tensile strength after 20-minute heat treatment at 270° C. is from 10% to 90%:

(X1−X2)/X1×100  Formula (1): X1: Tensile strength after 30-minute humidity control at 20° C. at 65% RH X2: Tensile strength after 20-minute heat treatment at 270° C.

A separator for aluminum electrolytic capacitors, the separator being interposed between a pair of electrodes in an aluminum electrolytic capacitor that includes a conductive polymer as a cathode material, where: the separator is composed of fibrillated cellulose fibers and fibrillated synthetic fibers; and a tensile strength decrease rate as expressed by formula (1) with use of a tensile strength after 30-minute humidity control at 20° C. at 65% RH and a tensile strength after 20-minute heat treatment at 270° C. is from 10% to 90%:

(X1−X2)/X1×100  Formula (1): X1: Tensile strength after 30-minute humidity control at 20° C. at 65% RH X2: Tensile strength after 20-minute heat treatment at 270° C.

Provided is an electrolytic capacitor with a resin layer, in which an increase in ESR over time is suppressed. A electrolytic capacitor includes a capacitor element including an anode foil, a cathode foil, and electrolytic solution, a case housing the capacitor element, a sealing member sealing the case, and a resin layer arranged in the vicinity of the sealing member. The resin layer arranged in the vicinity of the sealing member includes epoxy resin composition without ester bond.

Provided is an electrolytic capacitor with a resin layer, in which an increase in ESR over time is suppressed. A electrolytic capacitor includes a capacitor element including an anode foil, a cathode foil, and electrolytic solution, a case housing the capacitor element, a sealing member sealing the case, and a resin layer arranged in the vicinity of the sealing member. The resin layer arranged in the vicinity of the sealing member includes epoxy resin composition without ester bond.

An electrolytic capacitor includes a capacitor element and a liquid component. The capacitor element includes an anode body that includes a dielectric layer on a surface of the anode body and a conductive polymer that covers a part of the dielectric layer. The liquid component includes a first solvent and a polyalkylene glycol component. The first solvent contains at least a glycerin component.

An electrolytic capacitor includes a capacitor element and a liquid component. The capacitor element includes an anode body that includes a dielectric layer on a surface of the anode body and a conductive polymer that covers a part of the dielectric layer. The liquid component includes a first solvent and a polyalkylene glycol component. The first solvent contains at least a glycerin component.

To provide an electrolytic capacitor having a configuration that achieves a low impedance by increasing the content of water, satisfies a withstand voltage of 400 V or more, and is capable of enhancing the long-term reliability. Provided as a solution is an electrolytic capacitor (1) including an electrolytic solution (2e) containing ethylene glycol, 10 to 30% by mass of water, and 1 to 12% by mass of an amine salt of a carboxylic acid, having added thereto 0.01 to 2% by mass of one or more kind of ammonium hypophosphite, an amine salt of hypophosphorous acid, and hypophosphorous acid, the carboxylic acid being a polycarboxylic acid having a chain hydrocarbon skeleton and a molecular weight of 140 to 500.

To provide an electrolytic capacitor having a configuration that achieves a low impedance by increasing the content of water, satisfies a withstand voltage of 400 V or more, and is capable of enhancing the long-term reliability. Provided as a solution is an electrolytic capacitor (1) including an electrolytic solution (2e) containing ethylene glycol, 10 to 30% by mass of water, and 1 to 12% by mass of an amine salt of a carboxylic acid, having added thereto 0.01 to 2% by mass of one or more kind of ammonium hypophosphite, an amine salt of hypophosphorous acid, and hypophosphorous acid, the carboxylic acid being a polycarboxylic acid having a chain hydrocarbon skeleton and a molecular weight of 140 to 500.

A composition for an electrolytic capacitor and an electrolytic capacitor including the composition is provided. The composition includes an intrinsically conductive polymer and an electrolyte solution. The electrolyte solution includes an organic solvent, an ionic salt compound and a succinimide-based compound.

A composition for an electrolytic capacitor and an electrolytic capacitor including the composition is provided. The composition includes an intrinsically conductive polymer and an electrolyte solution. The electrolyte solution includes an organic solvent, an ionic salt compound and a succinimide-based compound.