EP 3 800 003 A1 kanolamine. [0035] Examplesofthe rosin include rawmaterialrosins such asgumrosin,wood rosin,and talloilrosin,and derivatives obtained from the raw material rosins. Examples of the rosin derivative include purified rosin, hydrogenated rosin, disproportionated rosin, polymerized rosin, acid-modified rosin, phenol-modified rosin, and  α , β  unsaturated carboxylic acid-modified products (such as acrylated rosin, maleated rosin, and fumarated rosin), purified products, hydrides, and disproportionated products of the polymerized rosin, purified products, hydrides, and disproportionated products of the α , β  unsaturated carboxylic acid-modified products, and the like, and one or two or more kinds of these can be used. The acid value ofthe rosin or the rosin derivative is 15mgKOH/g ormore,which is advantageous. The rosinmay include dehydroabietic acid, dihydroabietic acid, tetrahydroabietic acid, and the like. [0036] Examplesof the organic acid include succinic acid, glutaric acid, adipic acid,pimelic acid, suberic acid, sebacic acid,azelaic acid, dimeracid, propionic acid,2,2-bishydroxymethylpropionicacid, tartaric acid, malicacid, glycolic acid, diglycolic acid, thioglycolic acid, dithioglycolic acid, stearic acid, 12-hydroxystearic acid, palmitic acid, oleic acid, and the like. [0037] Examples of the alkanolamine include ethanolamine, 3-amino-1-propanol, 1-amino-2-propanol, dieth- anolamine, diisopropanolamine, triethanolamine, triisopropanolamine, and the like. [0038] The flux composition of the present embodiment is prepared, for example, by mixing a rosin-modified product, an organic acid, amine, and an organic halogen compound. [0039] The mixing amount of the rosin-modified product is preferably 5% by weight to 65% by weight based on the total amount of the flux. In the case of using the rosin-modified product in combination with phosphoric acid ester and/or phosphonic acid ester, a preferred total mixing amount of the phosphoric acid ester and/or the phosphonic acid ester is 1% by weight to 15% by weight based on the total amount of the flux. [0040] Examplesof the organic acid include succinic acid, glutaric acid, adipic acid,pimelic acid, suberic acid, sebacic acid,azelaic acid, dimeracid, propionic acid,2,2-bishydroxymethylpropionicacid, tartaric acid, malicacid, glycolic acid, diglycolic acid, thioglycolic acid, dithioglycolic acid, stearic acid, 12-hydroxystearic acid, palmitic acid, oleic acid, and the like. The mixing amount of the organic acid is preferably 0% by weight to 10% by weight based on the total amount of the flux for soldering. [0041] Examples of the amine include ethylamine, triethylamine, ethylenediamine, triethylenetetramine, 2-methylimi- dazole, 2-undecylimidazole, 2-heptadecylimidazole, 1,2-dimethylimidazole, 2-ethyl-4-methylimidazole, 2-phenylimida- zole, 2-phenyl-4-methylimidazole, 1-benzyl-2-methylimidazole, 1-benzyl-2-phenylimidazole, 1-cyanoethyl-2-methylimi- dazole, 1-cyanoethyl-2-undecylimidazole, 1-cyanoethyl-2-ethyl-4-methylimidazole, 1-cyanoethyl-2-phenylimidazole, 1- cyanoethyl-2-undecylimidazolium trimellitate, 1-cyanoethyl-2-phenylimidazolium trimellitate, 2,4-diamino-6-[2’-methyl- imidazolyl-(1’)]-ethyl-s-triazine,  2,4-diamino-6-[2’-undecylimidazolyl-(1’)]-ethyl-s-triazine,  2,4-diamino-6-[2’-ethyl-4’- methylimidazolyl-(1’)]-ethyl-s-triazine, 2,4-diamino-6-[2’-methylimidazolyl-(1’)]-ethyl-s-triazine isocyanuric acid adduct, 2-phenylimidazole isocyanuricacid adduct,2-phenyl-4,5-dihydroxymethylimidazole,2-phenyl-4-methyl-5-hydroxymeth- ylimidazole, 2,3-dihydro-1H-pyrrolo[1,2-a]benzimidazole, 1-dodecyl-2-methyl-3-benzylimidazolium chloride, 2-methyl- imidazoline, 2-phenylimidazoline, 2,4-diamino-6-vinyl-s-triazine, 2,4-diamino-6-vinyl-s-triazine isocyanuric acid adduct, 2,4-diamino-6-methacryloyloxyethyl-s-triazine, epoxy-imidazole adduct, 2-methylbenzimidazole, 2-octylbenzimidazole, 2-pentylbenzimidazole, 2-(1-ethylpentyl)benzimidazole, 2-nonylbenzimidazole, 2-(4-thiazolyl)benzimidazole, benzimi- dazole, 2-(2’-hydroxy-5’-methylphenyl)benzotriazole, 2-(2’-hydroxy-3’-tert-butyl-5’-methylphenyl)-5-chlorobenzotria- zole, 2-(2’-hydroxy-3’,5’-di-tert-amylphenyl)benzotriazole, 2-(2’-hydroxy-5’-tert-octylphenyl)benzotriazole, 2,2’-methyl- enebis[6-(2H-benzotriazole-2-yl)-4-tert-octylphenol], 6-(2-benzotriazolyl)-4-tert-octyl-6’-tert-butyl-4’-methyl-2,2’-methyl- enebisphenol, 1,2,3-benzotriazole, 1-[N,N-bis(2-ethylhexyl)aminomethyl]benzotriazole, carboxybenzotriazole, 1-[N,N- bis(2-ethylhexyl)aminomethyl]methylbenzotriazole, 2,2’-[[(methyl-1H-benzotriazole-1-yl)methyl]imino]bisethanol, 1-(1’,2’-dicarboxyethyl)benzotriazole, 1-(2,3-dicarboxypropyl)benzotriazole, 1-[(2-ethylhexylamino)methyl]benzotria- zole,2,6-bis[(1H-benzotriazole-1-yl)methyl]-4-methylphenol,5-methylbenzotriazole,5-phenyltetrazole,and thelike.The mixing amountofthe amine ispreferably 0%by weightto 10%by weightbased on thetotalamountofthe flux forsoldering. [0042] Examples of the organic halogen compound include 1-bromo-2-butanol, 1-bromo-2-propanol, 3-bromo-1-pro- panol,3-bromo-1,2-propanediol,1,4-dibromo-2-butanol,1,3-dibromo-2-propanol,2,3-dibromo-1-propanol,2,3-dibromo- 1,4-butanediol, 2,3-dibromo-2-butene-1,4-diol, and the like. The mixing amount of the organic halogen compound is preferably 0% by weight to 5% by weight based on the total amount of the flux for soldering. [0043] A solventcanbemixedin the flux composition ofthe presentembodimentin orderto dissolve a solid substance. Examples of the solvent include water, an alcohol-based solvent, a glycol ether-based solvent, terpineols, and the like. Examples of the alcohol-based solvent include isopropyl alcohol, 1,2-butanediol, Isobornyl cyclohexanol, 2,4-diethyl- 1,5-pentanediol, 2,2-dimethyl-1,3-propanediol, 2,5-dimethyl-2,5-hexanediol, 2,5-dimethyl-3-hexyne-2,5-diol, 2,3-dime- thyl-2,3-butanediol, 1,1,1-tris(hydroxymethyl)ethane, 2-ethyl-2-hydroxymethyl-1,3-propanediol, 2,2’-oxybis(methyl- 2. Flux composition 6