A heat-curable, water-dispersible resin composition comprising 50 to 90% by weight of a film-forming polymer (A) obtained by copolymerizing an ethylenic monomer having a saturated C6 to C18 hydrocarbon group, a hydroxy-containing ethylenic monomer, an acidic group-containing ethylenic monomer and another ethylenic monomer, and 50 to 10% by weight of a hydroxy-terminated polyester resin (B), said resin (B) being grafted on said polymer (A) by transesterification, and at least part of the acidic groups in said polymer (A) being neutralized with a base (C); a method of producing said resin composition; a water-based paint composition comprising said resin composition and a curing agent; and a two-coat one-bake coating method which uses said paint composition as a base coat. This invention provides a water-based paint composition which shows good workability in a broad humidity condition range, and excellent in storage stability, paint film appearance and performance characteristics.
一种热固化
水分散性
树脂组合物,包括 50%至 90%(按重量计)的成膜聚合物(A),该聚合物是由具有饱和 C6 至 C18 碳氢基的
乙烯单体、含羟基的
乙烯单体、含酸性基团的
乙烯单体和另一种
乙烯单体共聚而成,以及 50%至 10%(按重量计)的羟基封端聚酯
树脂(B)、含酸性基团的
乙烯基单体和另一种
乙烯基单体,以及 50-10%(按重量计)的羟基封端聚酯
树脂(B),所述
树脂(B)通过酯交换接枝到所述聚合物(A)上,且所述聚合物(A)中的至少部分酸性基团用碱(C)中和;一种生产所述
树脂组合物的方法;一种包含所述
树脂组合物和固化剂的
水性涂料组合物;以及一种使用所述涂料组合物作为底漆的两涂一烤涂装方法。本发明提供了一种
水性涂料组合物,该组合物在广泛的湿度条件范围内显示出良好的可加工性,并且在储存稳定性、漆膜外观和性能特性方面表现优异。