Coating composition, coating film and water friction reduction method

Without impairing the function of such a conventional coating composition, a coating composition capable of obtaining a low friction performance, as well as to provide a coating film and water friction reduction method comprising using it. ASTM D1141-98 solubility at 23 ° C. with the provisions artificial seawater is less 15 g / L, water absorption of the defined artificial seawater ASTM D1141-98 is at least 0.01 wt%, a particle size coating composition containing organic polymer particles is 0.05～100Myuemu.