EP 3 800 003 A1 [Concept 11] [Concept 12] [0024] In the liquid flux according to Concept 11, the amount of current may be 10  m A or less. [0025] The rosin-modified product and the flux composition using the rosin-modified product of the present invention can suppress the occurrence of migration due to the attachment of a water droplet or the like. [0026] A liquid flux of the present embodiment may be configured by dissolving a flux composition using a rosin- modified product of the embodiment described below in a solvent. A flux cored solder of the present embodiment may be configured bysealing a fluxcomposed ofaflux composition using a rosin-modifiedproductofthe presentembodiment described below in a wire solder. A solder paste of the present embodiment may be configured by adding a thixotropic agent, a solvent, and solder powder to a flux composition using a rosin-modified product of the embodiment described below. [0027] The rosin-modified product of the present embodiment may be produced by reaction of a rosin or a rosin derivative, an organic acid, and alkanolamine. The rosin-modified product produced in this way may be composed of a reactantofa rosinora rosin derivative and alkanolamine representedby the following StructuralFormula(1).Thenumber of carbon atoms in R may be 1 to 5. [0028] When a flux or the like is produced, a reactant of two molecules of alkanolamine may be included in addition to the reactant with such alkanolamine. As an example of such a reactant of two molecules of alkanolamine, a reactant of two molecules of diethanolamine can be mentioned. [0029] As an example of the reactant of a rosin or a rosin derivative and alkanolamine, reactants represented by the following structural formulas can be mentioned. Incidentally, the following Structural Formulas (2) and (3) are an aspect of using diethanolamine as alkanolamine, and in the case of using another alkanolamine, a part corresponding to diethanolamine is replaced by the alkanolamine. [0023] A liquid flux may have an amount of current, which is measured by using 289Si manufactured by Fluke Cor- poration under conditions of 25°C and humidity 50% after following process, being 100  m A or less, wherein the process includes 50  m l of a flux is applied to a board being a comb type electrode board type 2 (FR-4), then the flux is dried at 100°C for 10 minutes, then 10  m l of ion-exchange water is added dropwise on the flux, and then a voltage (applied voltage: DC 5 V) is applied to the board for 3 minutes.  Formula (1) NH$_{3-n}$-(R-OH)$_{n}$ (n  ≤  3) DETAILED DESCRIPTION 1. Rosin-modified product 4