Abstract: There are disclosed an electrolyte solution for an electrolytic capacitor containing an organic polar solvent and an ionic solute, and further comprising fine particles of an aluminosilicate represented by the following formula, or metal oxide fine particles covered with said aluminosilicate:MAlO.sub.2 (Al.sub.2 O.sub.3).sub.x (SiO.sub.2).sub.ywherein M represents a monovalent cation; x represents a real number of 0 to 25; and y represents a real number of 1 to 200,and an electrolytic capacitor using said electrolyte solution.

Abstract: An electrolytic solution for an electrolytic capacitor is disclosed, comprising a basic solution comprising a mixed solvent of .gamma.-butyrolactone and ethylene glycol having dissolved therein a quaternary alkylammonium salt of phthalic acid, maleic acid or benzoic acid as a solute, the basic solution further containing from 0.5 to 10 parts by weight of colloidal silica and from 0.5 to 8 parts by weight of at least one phosphorus compound selected from dialkyl phosphate and phosphorous acid, per 100 parts by weight of the basic solution. The electrolytic solution has an increased dielectric strength while retaining high conductivity.

Abstract: Disclosed is an electrolyte for an electrolytic capacitor which comprises a salt of a tertiary dicarboxylic acid represented by the following formula (I) or (II): ##STR1## wherein n represents an integer of 1 to 5, and R.sup.1 to R.sup.4 each represents an alkyl group having 4 or less carbon atoms, ##STR2## wherein n has the same meaning as defined above, l and m each represents an integer of 4 or 5, and R.sup.5 and R.sup.6 each represents hydrogen atom, methyl group or ethyl group,and an electrolytic capacitor using the same.

Abstract: A process for producing quaternary salts of high purity is disclosed, comprising reacting a tertiary amine or phosphine with a carbonic acid diester to form a corresponding quaternary carbonate and further mixing it with an acid to perform decarboxylation. The quaternary salts thus obtained are useful compounds which can be used in wide fields as various catalysts, electrolytes, additives, medicaments, etc.

Abstract: An electrolyte for aluminum electrolytic capacitor is described, comprising a solution of, as a solute, a quaternary ammonium salt having as an anion component the conjugated base of an inorganic acid compound selected from the group consisting of(1) boric acid,(2) phosphoric acid,(3) phosphorous acid and phosphorous acid monoesters, and phosphonic acids, and phosphonic acid monoesters,(4) hypophosphorous acid and phosphinic acids,(5) alkylboric acids and arylboric acids,(6) silicic acid, and(7) carbonic acid and carbonic acid monoesters, dissolved in an aprotic solvent mainly composed of .gamma.-butyrolactone.This electrolyte can reduce the internal resistance of the electrolytic cpacitor and broaden the temperature range over which the electrolytic capacitor can be used.

Abstract: An electrolyte for use in an aluminum electrolytic capacitor is described. The electrolyte comprises a solution of a quaternary phosphonium salt as a solute dissolved in an aprotic solvent. The electrolyte can reduce internal resistance of the electrolytic capacitor and broaden the temperature range over which the electrolytic capacitor can be used.

Abstract: An electrolyte solution for use in an electrolytic capacitor. The solution comprises as a solute at least one quaternary ammonium salt of a carboxylic acid selected from the group consisting of(a) quaternary ammonium salts of maleic acid and/or citraconic acid,(b) quaternary ammonium salts of aromatic carboxylic acids, and(c) quaternary ammonium salts of branched-chain aliphatic dicarboxylic acids having 11 to 30 carbon atoms in total. This electrolyte solution has high electric conductivity.