| 摘要 |
<p>A cationic finely divided polymeric microgel dispersed in an aqueous medium for use in cationic electrocoating compositions which is a polyamine reaction product having reactive amine and hydroxyl groups and is the reaction product of a polyepoxy hydroxy polymer and an amine compound from the group of ketimines, primary amines, secondary amines or any mixtures thereof: the polyepoxy amine reaction product is reacted with an oxime blocked polyisocyanate under temperature conditions sufficient to deblock the polyisocyanate thereby providing reactive isocyanate groups which react with the amine groups and hydroxyl groups of the polyamine reaction to form a crosslinked microgel; residual amine groups of the microgel are neutralized with an organic acid to form cationic groups that are water dispersible. A process for forming the microgel and cationic electrocoating compositions containing the microgel are included.</p> |
