| 摘要 |
<p>A binder for a heat-curable aqueous coating composition for metallic surfaces comprises: (A) 60-95% by weight of a water-soluble and/or water-dispersible addition compound of 10-35% by weight of one or more alpha , beta -unsaturated dicarboxylic acids and 65-90% by weight of a butadiene polymer which is liquid at 20 DEG C., contains at least 50 mole % of butadiene units and has a molecular weight of 500 to 6,000, the addition compound being at least partially neutralized with a basic compound and partially esterified, and (B) 5-40% by weight of a water-soluble and/or water-dispersible crosslinking resin having, on the average, at least 2 chemically different reactive groups per mole, wherein the addition compound (A) is esterified to 10-70 equivalent percent, based on its acid number, with one or more unsaturated alcohols of the formula <IMAGE> and wherein at least one of the reactive groups of the crosslinking resin (B) is of formula II <IMAGE> II wherein, for both formulae I and II, R1, R2 and R3 can be identical or different and each independently is hydrogen or methyl, R4 is hydrogen or C1-5-alkyl, and n is 0 or 1.</p> |
