| 摘要 |
PURPOSE:To provide the title composition giving an electrodeposition coating film having improved corrosion resistance, containing a blocked-polyisocyanate-modified basic amino-group-containing conjugated diene polymer derived from a maleinized conjugated diene polymer, as main film-forming component. CONSTITUTION:A conposition containing a conjugated diene polymer modified with blocked polyisocyanate and containing basic amino groups. The modified diene polymer is prepared as follows: (1) a conjugated diene polymer is reacted with maleic anhydride to obtain a maleinized conjugated diene polymer having a number average molecular weight of 200-100,000, (2) the maleinized polymer is half- esterified with an alcohol containing a tertiary amino group of formula (R1 is 1- 20C bivalent hydrocarbon; R2,3 are 1-20C univalent hydrocarbon, etc.) and/or a 1-18C alcohol, (3) it is converted to an epoxy-containing conjugated diene polymer by reacting with an epoxy resin, (4) the epoxy-containing resin is reacted with a primary or secondary amine, and (5) the reaction product is further reacted with a partially blocked polyisocyanate compound to afford the objective modified diene polymer.
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