Surface layer-peelable composite coating film, coating composition for forming composite coating film, and method

A coating composition comprising:

• a base resin composition comprising an oxidative polymerization resin;
• an organic compound having a melting point of 5 to 150° C.;
• a dryer;
• and
• an oxidative polymerization inhibitor comprising at least one of a dryer protectant and a radical inhibitor,
• wherein the coating composition comprises 10 to 100 wt % of the organic compound based on 100 wt % of the base resin composition and an effective amount of the dryer such that a content of metal elements in the dryer is 0.001 to 1.5 wt % based on 100 wt % solid content of the oxidative polymerization resin, and
• wherein
• if the oxidative polymerization inhibitor comprises one of the dryer protectant and the radical inhibitor,
• 0.5 to 4 moles of the dryer protectant is contained per mole of metal elements in the dryer;
• or
• 0.01 to 2.0 wt % of the radical inhibitor is contained based on 100 wt % solid content of the oxidative polymerization resin;
• or
• if the oxidative polymerization inhibitor comprises both of the dryer protectant and the radical inhibitor,
• when 0.5 to 4 moles of the dryer protectant is contained per mole of metal elements in the dryer, 2.0 wt % or less of the radical inhibitor is contained based on 100 wt % solid content of the oxidative polymerization resin;
• or
• when less than 0.5 moles of the dryer protectant is contained per mole of metal elements in the dryer, 0.01 to 2.0 wt % of the radical inhibitor is contained based on 100 wt % solid content of the oxidative polymerization resin.