Nippon Paint Compnay, Ltd.

Nippon Paint Marine Coatings Co., Ltd.

Hiroshi Tominaga

Naoki Yamamori

Mamoru Shimada

Provided are coating composition containing an organic polymer particle (A) composed of an organic polymer having a hydroxyl group and a cationic group in a molecule, the weight average particle size of which being 10 to 35 &#x3bc;m, and a base resin (B), wherein the content of the organic polymer particle (A) is 0.5 to 5.0% by weight in the solid content of the coating composition, and a method of producing the same, and a coating film and underwater structure using the coating composition. The base resin (B) has a group represented by the following general formula (1):&#x2014;COO-M-OCO-A&#x2003;&#x2003;(1)(wherein, M represents a divalent or higher valent metal, and A represents an organic acid residue of monobasic acid) or a group represented by the following general formula (2):&#x2014;COO&#x2014;Si(RRR)&#x2003;&#x2003;(2)(wherein, R, Rand R, which may be the same or different, represent an isopropyl group or an n-butyl group) in a side chain, or has a cross-linking structure represented by the following general formula (3):&#x2014;COO-M-OCO&#x2014;&#x2003;&#x2003;(3)(wherein, M represents the same meaning as described above).

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Neyagawa, Japan

Hiroshi Tominaga