| 摘要 |
PROBLEM TO BE SOLVED: To provide a flux that does not generate a phenomenon of chip rising even by soldering using an non-leaded solder, hardly cause thermal deterioration in residual film, and prevents erroneous judgment even in an inspection with an image inspection machine, and to provide a solder paste. SOLUTION: The flux for soldering a circuit board is a flux used for soldering an electronic component onto the circuit board containing a polybutadiene-based high molecular compound. The solder paste for soldering the circuit board uses the flux. The circuit board before or after mounting the electronic part has the residual films. COPYRIGHT: (C)2004,JPO
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