| 摘要 |
PROBLEM TO BE SOLVED: To obtain a water-based coating composition that can form a coating layer of excellent weather resistance with good adhesion to the coating layers formed with a variety of acrylic, silicone, fluorine coatings and the like. SOLUTION: The objective water-based coating composition comprises (A) a copolymer prepared by polymerizing 5-80 mass % of a monomer represented by the formula: CH2=CR1-COOC(CH3)3 (R1 is H or a 1-2C alkyl group), 0.1-10 mass % of a monomer represented by the formula (R2 is H or a 1-2C alkyl group; X is an oxygen or an imino group; Y is H or a 1-20C hydrocarbon substituent), 0.1-10 mass % of an ethylenically unsaturated carboxylic acid monomer and 0-94 wt.% of other ethylenically unsaturated monomer.
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