| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide flux that increases wettability of lead-free solder metal on a clearance resist in the atmosphere.SOLUTION: Flux for lead-free solder paste for a clearance resist comprises a rosin-based base resin (A), a solvent (B) and an activator (C). The (A) component comprisesα,βunsaturated carboxylic acid-modified rosin (a1). The (B) component is a propylene glycol-based ether (b1) with a boiling point of 275°C or less. The (C) component is a dibasic acid (c1) represented by the general formula (1) defined by HOOC-R-COOH, where R is a C2-C4 hydrocarbon group.</p> |
