| 摘要 |
PROBLEM TO BE SOLVED: To provide a base resin for solder flux exhibiting an excellent base resin action and also having excellent thermal stability and low crystallinity by a simple process. SOLUTION: The base resin for solder flux is a reaction product obtained by bringing denatured rosins (A) obtained by addingα,β-unsaturated carboxylic acids (a1) to natural rosins (a2) under Diels-Alder reaction at an addition rate of 10 to 80 mol% into disproportionation in the presence of a dehydrogenation catalyst (B), and also comprises dehydroabietic acid of 10 to 60 wt.% andα,β-unsaturated carboxylic acid-denatured pimaric acid of 10 to 70 wt.%. COPYRIGHT: (C)2007,JPO&INPIT
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