Coating composition and method for producing the same, coating film and underwater structures

A method of producing a coating composition comprising the step of:

• mixing an organic polymer particle (A) composed of an organic polymer having a hydroxyl group and a cationic group in a molecule, said organic polymer particle (A) having a weight average particle size of 10 to 35 μm, as measured by using a laser diffraction-type particle size distribution measuring apparatus;
• and
• a base resin (B) having at least any one of a group represented by the following general formula (1):
• —COO-M-OCO-A (1)
• (wherein, M represents a divalent or higher valent metal, and A represents an organic acid residue of monobasic acid) and a group represented by the following general formula (2):
• —COO—Si(R1R2R3) (2)
• (wherein, R1, R2 and R3, which may be the same or different from one another, represent an isopropyl group or an n-butyl group) in a side chain, or having a cross-linking structure cross-linking between main chains, represented by the following general formula (3):
• —COO-M-OCO (3)
• (wherein, M represents the same meaning as described above) so that the content of said organic polymer particle (A) is 0.5 to 5.0% by weight in the solid content of the coating composition.