| 摘要 |
PROBLEM TO BE SOLVED: To provide a flux for soldering that exhibits excellent advantages of a solder paste in all of printing properties, wettability and crack resistance of flux residue.SOLUTION: A flux for soldering contains an acrylic resin (A) and an acrylic resin (B) as base resins. The acrylic resin (A) has an acid value of 0 to 70 and formed by polymerizing a monomer mixture containing an alkyl(meth)acrylate of which alkyl group has 12 to 23 carbon atoms, and the acrylic resin (B) has an acid value of 30 to 230 and formed by polymerizing a monomer mixture containing an alkyl(meth)acrylate of which alkyl group has 6 to 10 carbon atoms. The acid value of the acrylic resin (B) is higher than that of the acrylic resin (A) by a difference of 15 or more. Further, a solder paste composition contains the flux and solder alloy powder. |
