| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a solder composition which is good in solderability, excels in color tone of a flux residue, and reduces the flux residue, and a flux which can provide such solder composition. <P>SOLUTION: The flux for solder is characterized in that the maximum absorbance A in a region 254 nm or more measured by an ultraviolet ray absorptiometric method (measuring condition: sample concentration 1 g/dm<SP POS="POST">3</SP>, 1 cm of cell length) is 0.15 or less, and that it contains rosins (A) of which the content of a component with molecular weight of 320 measured by a gas chromatograph mass spectrometry of methylation treatment is 95% or more of the amount of sum total of the component with molecular weight of 314-320. <P>COPYRIGHT: (C)2012,JPO&INPIT |
