申请人:KANSAI PAINT CO., LTD.
公开号:EP2835404A1
公开(公告)日:2015-02-11
An object of the present invention is to provide an aqueous coating composition that can form a coating with excellent smoothness, distinctness of image, water resistance, and chipping resistance, and that has excellent wash-off properties, and a method for forming the coating film. As means for achieving this object, the present invention provides an aqueous coating composition for use as an aqueous first colored coating composition in a multilayer coating-forming method, the coating composition containing an aqueous film-forming resin (A), a crosslinking agent (B), and acrylic urethane resin composite particles (C). The acrylic resin of the acrylic urethane resin composite particles (C) is obtained by using, as constituent monomers, 30 to 80 mass% of a polymerizable unsaturated monomer (c-1-1) having one polymerizable unsaturated group per molecule and having a C4-22 alkyl group, 1 to 20 mass% of a polymerizable unsaturated monomer (c-2) having two or more polymerizable unsaturated groups per molecule, and 0 to 69 mass% of a polymerizable unsaturated monomer (c-1-2) having one polymerizable unsaturated group per molecule and being other than the polymerizable unsaturated monomer (c-1-1).
本发明的目的是提供一种水性涂料组合物,该组合物可以形成具有优异平滑度、图像清晰度、耐水性和抗崩角性的涂层,并且具有优异的冲洗性能,以及一种形成涂膜的方法。作为实现这一目标的方法,本发明提供了一种水性涂料组合物,可用作多层涂料形成方法中的水性第一有色涂料组合物,该涂料组合物含有水性成膜树脂(A)、交联剂(B)和丙烯酸聚氨酯树脂复合颗粒(C)。丙烯酸聚氨酯树脂复合颗粒(C)中的丙烯酸树脂是通过使用 30% 至 80% 的可聚合不饱和单体(c-1-1)作为组成单体获得的,该单体每个分子具有一个可聚合不饱和基团,并具有一个 C4-22 烷基、1 至 20 质量百分比的可聚合不饱和单体 (c-2),其每个分子具有两个或两个以上的可聚合不饱和基团;以及 0 至 69 质量百分比的可聚合不饱和单体 (c-1-2),其每个分子具有一个可聚合不饱和基团,且与可聚合不饱和单体 (c-1-1) 不同。