申请人:NIPPON PAINT CO., LTD.
公开号:EP0448341A1
公开(公告)日:1991-09-25
Disclosed is a coating composition for precoated metal material excellent in electrodeposition coating performance, possessing high corrosion-resistance and high processing adhesion, and capable of forming a coat film applicable to spot welding.
The coating composition for precoated metal material in the present invention comprises, as essential ingredients, a binder resin possessing film-forming capability, a hydrophilic resin for performing electrodeposition coating uniformly, and fine granular silica for enhancing corrosion-resistance, being dissolved or dispersed in organic solvent, is characterized in that the binder resin has a number-average molecular weight of 600 to 100,000 and contains 25 or more mol% of an aromatic hydroxy compound in its constituent monomer, and the hydrophilic resin is a polyamine resin and/or polyimine resin having a number-average molecular weight of 600 to 100,000 and contains 25 or more mol% of an amine compound in its constituent monomer.
本发明公开了一种用于预涂覆金属材料的涂料组合物,它具有优异的电沉积涂覆性能、高耐腐蚀性和高加工附着力,并能形成适用于点焊的涂膜。
本发明中用于预涂金属材料的涂料组合物包括作为基本成分的具有成膜能力的粘结剂树脂、用于均匀进行电沉积涂覆的亲水性树脂和用于提高耐腐蚀性的细颗粒状二氧化硅,它们溶解或分散在有机溶剂中、其特征在于,粘合剂树脂的数均分子量为 600 至 100 000,在其组成单体中含有 25 或 25 mol%以上的芳香族羟基化合物,亲水性树脂是数均分子量为 600 至 100 000,在其组成单体中含有 25 或 25 mol%以上的胺化合物的聚胺树脂和/或聚亚胺树脂。