Rosin-based base resin for lead-free solder flux, lead-free solder flux, lead-free solder paste

摘要

PROBLEM TO BE SOLVED: To provide a rosin-based base resin for a lead-free solder flux in which cracking of a flux residue and generation of voids are suppressed and the solder paste exhibits excellent storage stability; a lead-free solder flux containing the rosin-based base resin; Providing a lead-free solder paste containing the flux. SOLUTION: This is a rosin-based base resin for lead-free solder flux containing a rosin ester (A) of rosins and a monovalent alcohol, and tetrahydroabietic acid ester (A1) and dihydroabietic acid are contained in the component (A). A rosin-based base resin for lead-free solder flux containing a total of 95% by weight or more of an ester (A2) and a dehydroabietic acid ester (A3). [Selection diagram] None