A curable composition is obtained by mixing a polymerization initiator (B) or further a thermosetting component with an unsaturated group-containing multi-branched compound (A-1)-(A-4) obtained by the reaction of (a) a compound containing at least two epoxy groups in its molecule with (b) a compound containing at least two (but at least three when the component (a) mentioned above is a polyfunctional epoxy compound containing two epoxy groups) carboxyl groups and/or phenolic hydroxyl groups in its molecule and (c) an unsaturated monocarboxylic acid or a compound containing at least one unsaturated double bond-containing group, or an unsaturated group-containing multi-branched compound (A-5)-(A-8) having a carboxyl group and obtained by further causing (d) a polybasic acid anhydride to react with a hydroxyl group of the unsaturated group-containing multi-branched compound mentioned above.
将聚合
引发剂(B)或热固性成分与含不饱和基团的多支链化合物(A-1)-(A- 4)混合,可得到固化组合物。4)与(b)分子中含有至少两个(但当上述成分(a)为含有两个环氧基团的多官能团环氧化合物时,至少三个)羧基和/或
酚羟基的化合物和(c)不饱和单
羧酸或含有至少一个不饱和双键基团的化合物反应而得、或通过进一步使(d)聚碱性酸酐与上述含不饱和基团的多支链化合物的羟基反应而得到的具有羧基的含不饱和基团的多支链化合物(A-5)-(A-8)。