| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain the subject resin capable of satisfying flexibility, shrinkage at the hardening time, adhesion or the like by carrying out the reaction of a dihydric hydroxyl-terminal polybutadiene, a tetrabasic acid dianhydride and a diisocyanate compound. SOLUTION: This resin is obtained by reacting (A) a dihydric hydroxyl- terminated polybutadiene with 800-5000 number average molecular weight with (B) a tetrabasic acid dianhydride of formula I (R1 is a residue obtained by removing carboxyl groups from an organic compound containing four carboxyl groups) and (C) a diisocyanate compound, and is a modified polyimide resin of formula II [R2 is a residue obtained by removing isocyanate groups from an organic compound containing two isocyanate groups; R3 is a residue obtained by removing hydroxyl from a hydroxyl-terminated polybutadiene; L1 and M1 are composition ratios of polybutadiene units and polyimide units respectively, n1 is a degree of polymerization, and L1, M1 and n1 satisfy the formulas L1+M1=1, 0<L1<1, 0<M1<1, and 1<=n1<=10,000]. The resin is useful for an overcoating agent of a wiring circuit.</p> |
