EP 3 800 003 A1 ene)bis(2-ethyl-1,3-propanediol), 2,2-bis(hydroxymethyl)-1,3-propanediol, 1,2,6-trihydroxyhexane, bis[2,2,2-tris(hy- droxymethyl)ethyl]ether, 1-ethynyl-1-cyclohexanol,1,4-cyclohexanediol, 1,4-cyclohexanedimethanol,erythritol,threitol, guaiacol glycerol ether, 3,6-dimethyl-4-octyne-3,6-diol, 2,4,7,9-tetramethyl-5-decyne-4,7-diol, and the like. Examples of the glycol ether-based solvent include hexyl diglycol, diethylene glycol mono-2-ethylhexyl ether, ethylene monophenyl ether, 2-methylpentane-2,4-diol, diethylene glycol monohexyl ether, diethylene glycol dibutyl ether, trieth- ylene glycol monobutyl ether, and the like. The mixing amount of the solvent is preferably 10% by weight to 90% by weight based on the total amount of the flux for soldering. [0044] An antioxidantcan be mixed in the flux composition ofthe presentembodimentinorderto suppressthe oxidation of solder alloy powder. As the antioxidant, a hindered phenol-based antioxidant such as 2,2’-methylenebis[6-(1-meth- ylcyclohexyl)-p-cresol] can be used. The mixing amount of the antioxidant is preferably 0% by weight to 5% by weight based on the total amount of the flux for soldering. [0045] A thixotropic agentcan bemixed inthe flux composition ofthe presentembodimentin order to adjust the solder paste to have a viscosity suitable for printing. Examples of the thixotropic agent include a wax-based thixotropic agent and an amide-based thixotropic agent. As the wax-based thixotropic agent, for example, hydrogenated castor oil and the like are mentioned. Examples of the amide-based thixotropic agent include lauric amide, palmitic amide, stearic amide, behenic amide, hydroxystearic amide, saturated fatty acid amide, oleic amide, erucamide, unsaturated fatty acid amide, p-toluenemethanamide, aromatic amide, methylenebis stearic amide, ethylenebis lauric amide, ethylenebis hy- droxystearic amide, saturated fatty acid bisamide, methylenebis oleic amide, unsaturated fatty acid bisamide, m-xy- lylenebis stearic amide, aromatic bisamide, saturated fatty acid polyamide, unsaturated fatty acid polyamide, aromatic polyamide, substituted amide, methylol stearic amide, methylol amide, fatty acid ester amide, and the like. The mixing amount of the thixotropic agent is preferably 3% by weight to 15% by weight based on the total amount of the flux for soldering. [0046] An additive such as halogen, a matting agent, or a defoamer may be further added to the flux composition of the present embodiment. The mixing amount of the additive is preferably 10% by weight or less and more preferably 5% by weight or less based on the total amount of the flux for soldering. [Examples] [0047] Hereinafter,the presentinventionwillbe described indetailbymeans ofExamplesand Comparative Examples. Incidentally, the present invention is not limited to these Examples. Preparation of rosin-modified product [0048] To a 200-ml beaker, KE-604 (acid-modified rosin: manufactured by ARAKAWA CHEMICAL INDUSTRIES, LTD.) or KE-604 and KR-610 (disproportionated rosin: manufactured by ARAKAWA CHEMICAL INDUSTRIES, LTD.) at % by weight shown in the following Table 1, adipic acid, sebacic acid, or phenylsuccinic acid, and diethanolamine, monoisopropanolamine, or monoethanolamine were added and heated to 200°C over about 15 minutes under stirring. Next,afterthe resultantmixture was heldat200°C for15 minutes,theresultantmixture wasreturned to roomtemperature, thereby obtaining rosin-modified products 1 to 6. The structural formula of the obtained rosin-modified product was specified using GC/MS analysisand LC/FTMS (orbitrap),and thusit could bedeterminedthattherosin-modified product was composed of a reactant of a rosin or a rosin derivative and alkanolamine represented by the following Structural Formula (1). [0049] Incidentally, the presence of an organic acid cannot be confirmed in the above-described reactant of a rosin or a rosin derivative and alkanolamine. However, the effect of suppressing the occurrence of migration cannot be sufficiently exhibited in a case where an organic acid is not used when producing the reactant. Further, the organic acid can be confirmed to be decreased when producing the reactant of a rosin or a rosin derivative and alkanolamine. Thus, adding an organic acid when producing the above-described reactant of a rosin or a rosin derivative and alkanolamine is advantageous. [0050] When the structuralformulaoftherosin-modifiedproductisspecified,itcould also bedetermined thata reactant of two molecules of alkanolamine is included in addition to the above-described reactant of a rosin or a rosin derivative and alkanolamine.Therefore,in the aspectinwhich the reactantoftwomolecules ofalkanolamine isincluded in addition to the reactant of a rosin or a rosin derivative and alkanolamine, a flux composition or the like which will be described below may be produced.  Formula (1) NH$_{3-n}$-(R-OH)$_{n}$ (n  ≤  3) 7