| 摘要 |
PURPOSE:To obtain a cathodic electrodeposition coating composition which causes little loss in weight of the coating film on baking and has excellent corrosion resistance, etc., by mixing an epoxidized polybutadiene/amine/ unsaturated carboxylic acid adduct having a specified composition with specified tow kinds of modified epoxy resins. CONSTITUTION:100pts.wt. epoxidized polybutadiene/amine/unsaturated carboxylic acid adduct (A) which has a number-average molecular weight of 500-10,00 and contains 70-200mM of tertiary amino groups, 20-200mM of alpha,beta-unsaturated monocarboxylic acid ester groups, and 200-2,000mM of C-C double bonds, based on 100g of resin, is mixed with 20-200pts.wt. addition product (B) of 1mol of an epoxy resin with 1.5-2mol of an alpha,beta-unsaturated monocarboxylic acid, 5-50pts.wt. addition product (C) of 1mol of an epoxy resin with a mixture of 0.5-1.5mol of an alpha,beta-unsaturated monocarboxylic acid and 0.5-1.5mol of a secondary amine, and 0-100pts.wt. water-based resin (D).
|
