| abstract |
The wettability of the solder can be ensured, and the amount of residue after soldering can be suppressed to provide a flux capable of realizing low residue. The flux is hydrogen to dimer acid, a reaction product of oleic acid and linoleic acid, trimer acid, which is a reaction product of oleic acid and linoleic acid, hydrogenated dimer acid, which is a reaction product of oleic acid and linoleic acid, and trimer acid, which is a reaction product of oleic acid and linoleic acid. Any of the added hydrogenated trimer acids, or dimer acid as a reaction product of oleic acid and linoleic acid, trimer acid as a reaction product of oleic acid and linoleic acid, hydrogenated dimer acid in which hydrogen is added to dimer acid as a reaction product of oleic acid and linoleic acid, and oleic acid and linoleic acid The total of two or more types of hydrogenated trimer acids obtained by adding hydrogen to the trimer acid, which is a reactant of, is 1 wt% or more and 13 wt% or less, and the solvent is 65 wt% or more and 99 wt% or less. |