| 摘要 |
PROBLEM TO BE SOLVED: To stabilize the viscosity of solder paste without causing an increase in the viscosity of the solder paste by suppressing the growth of metal salt even under the long-term storage of the solder paste, thereby improving the storage stability of the solder paste while maintaining excellent solder melting property.SOLUTION: Solder paste 10 is produced by mixing a first flux 11 containing a solvent, rosin and a thixotropic agent, into solder powder 13 to prepare a mixture 14, and further mixing a second flux 12 into the mixture 14. The second flux 12 contains an activator containing one or more kinds selected out of a group consisting of organic acid-based, amine and organic halogen compounds and ionic halogen compounds; a solvent; and rosin. The first flux 11 does not contain the activator. |
