PROBLEM TO BE SOLVED: To provide an aqueous coating agent, a mildew-proofing agent and an antibacterial agent, which are excellent in safety and weather resistance in addition to mildewproof and antibacterial properties, and can sustain high mildewproof and antibacterial properties without discoloration even when used under a high-humidity condition or in a place around plumbing or exposed to rain.SOLUTION: The aqueous coating agent contains (A) a resin emulsion having film-forming ability, which is obtained by emulsion polymerization using a surfactant (B) a boron-based compound and (C) a zinc compound. The use rate of (B) the boron-based compound to (C) the zinc compound is 10:1 to 0.1:1 in terms of mass ratio. This aqueous coating agent is excellent in safety and weather resistance in addition to mildewproof and antibacterial properties and can sustain such effects for a long period even under a condition exposed to high humidity or weather. Thus, the aqueous coating agent can be applied to indoor and outdoor plastic material, paper material, wood, fibrous material, an inorganic material such as metal material or concrete material.COPYRIGHT: (C)2013,JPO&INPIT【解決手段】(A)界面活性剤を使用して乳化重合された皮膜形成能を有する樹脂エマルジョン、(B)ホウ素系化合物、(C)亜鉛化合物を含有し、(B)ホウ素系化合物と(C)亜鉛化合物の使用比率が質量比で10:1~0.1:1であることを特徴とする水系コーティング剤。【効果】本発明は、防カビ、抗菌性能に優れるばかりか、安全性、耐候性にも優れ、高湿度や風雨にさらされる条件下でも長期間効果を持続できる水系コーティング剤を提供するものであり、屋内外のプラスチック材、紙材、木材、繊維材、金属材、コンクリート材等の無機系材料などに利用することができる。【選択図】なし
