The object of the present invention is to provide a soldering-flux-oriented novel base resin that enhances the fluidity of a soldering flux and both the visco-stability and adhesion of a solder paste, while improving the color tone and anti-crack property of the flux residue. The present invention is directed to a base resin for a soldering flux, the base resin comprising a rosin (A) containing at least 15 wt% of a pimarane-type resin acid (a-1), at least 1 wt% of a labdane-type resin acid (a-2), and at least 50 wt% of an abietane-type resin acid that has no conjugated double bond (a-3).
本发明的目的是提供一种面向焊接助焊剂的新型基础
树脂,它能提高焊接助焊剂的流动性以及焊膏的粘稳定性和粘附性,同时改善助焊剂残留物的色调和抗裂性能。 本发明涉及一种用于焊接助焊剂的基础
树脂,该基础
树脂包括
松香(A),其中含有至少 15 wt%的皮马兰型
树脂酸(a-1)、至少 1 wt%的拉布丹型
树脂酸(a-2)和至少 50 wt%的无共轭双键的阿比坦型
树脂酸(a-3)。