abstract |
(57) [Summary] [PROBLEMS] To provide a non-cleaning type flux excellent in moisture resistance, cold / hot crack resistance and the like. SOLUTION: (Meth) acrylic acid ester having an alkyl group having 8 to 15 carbon atoms (a) 35 to 80% by weight, carboxyl group-containing vinyl monomer (b) 3 to 60% by weight, (a) And a flux composition containing an acrylic copolymer comprising 0 to 62% by weight of another vinyl monomer (c) copolymerizable with the component (b). |