Abstract: Provided is a flux which can remove metal oxides to improve solder wettability and can fix the object to be soldered with flux residue. The flux contains thermosetting resin, and long-chain dibasic acid mixture including one or more species of first long-chain dibasic acid having an alkyl group in a side chain, the first long-chain dibasic acid being added as a hardening agent for hardening the thermosetting resin and an activator, and second long-chain dibasic acid having an alkyl group and an alkoxycarbonyl group in a side chain and having carbon number of 8 or more in a main chain between the carboxyl groups at opposite terminals. It is preferable that content of the thermosetting resin is 30% through 70% and content of the long-chain dibasic acid mixture is 20% through 60%.

Abstract: Provided is a flux which can remove metal oxides to improve solder wettability and can fix the object to be soldered with flux residue. The flux contains thermosetting resin, and long-chain dibasic acid mixture including one or more species of first long-chain dibasic acid having an alkyl group in a side chain, the first long-chain dibasic acid being added as a hardening agent for hardening the thermosetting resin and an activator, and second long-chain dibasic acid having an alkyl group and an alkoxycarbonyl group in a side chain and having carbon number of 8 or more in a main chain between the carboxyl groups at opposite terminals. It is preferable that content of the thermosetting resin is 30% through 70% and content of the long-chain dibasic acid mixture is 20% through 60%.

Abstract: An electrolytic solution for operating electrolytic capacitors which deteriorates extremely little in electrical properties even when used in a high-tension capacitor. The electrolytic solution comprises a compound expressed by general formula (1) below and a compound expressed by general formula (2) below or their salts: where each R is a same or different alkyl group, and R? is hydrogen, a methyl group or an ethyl group, and n is an integer of 0 to 14.

Abstract: An electrolytic solution for operating electrolytic capacitors which deteriorates extremely little in electrical properties even when used in a high-tension capacitor. The electrolytic solution comprises a compound expressed by general formula (1) below and a compound expressed by general formula (2) below or their salts: where each R is a same or different alkyl group, and R? is hydrogen, a methyl group or an ethyl group, and n is an integer of 0 to 14.