AQUEOUS RESIN COMPOSITION FOR COATING MATERIAL

To provide an aqueous resin composition for coating material which gives a coating material that sufficiently achieves both stain resistance and prevention of cracks of a coated film.SOLUTION: An aqueous resin composition for coating material contains emulsion particles having an urethane-based polymer component and an acrylic polymer component, and a water-soluble polymer having a weight average molecular weight of 10,000-200,000. In the composition, the emulsion particles and the water-soluble polymer can form a crosslinked structure, the emulsion particles have a functional group (α), the water-soluble polymer has a functional group (β), and the composition contains a crosslinking agent (C) that can cause a reaction to occur between the functional group (α) and the functional group (β) to form a crosslinked structure.SELECTED DRAWING: Figure 1 【課題】耐汚染性と塗膜のクラック防止とを充分に両立する塗料を与える、塗料用水性樹脂組成物の提供。【解決手段】ウレタン系ポリマー成分及びアクリル系ポリマー成分を有するエマルション粒子、及び、重量平均分子量が１万〜２０万の水溶性ポリマーを含む塗料用水性樹脂組成物である。組成物は、エマルション粒子と水溶性ポリマーとが架橋構造を形成し得るものであり、エマルション粒子は、官能基（α）を有し、水溶性ポリマーは、官能基（β）を有し、組成物は、官能基（α）と官能基（β）との間で反応して架橋構造を形成し得る架橋剤（Ｃ）を含む。【選択図】図１