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The object of the present invention is to provide a golf ball having a paint film which is obtained from an environment-friendly aqueous paint and is excellent in the impact-resistance and the wear-resistance. The present invention provides a golf ball having a paint film on a surface of a golf ball

The object of the present invention is to provide a golf ball having a paint film which is obtained from an environment-friendly aqueous paint and is excellent in the impact-resistance and the wear-resistance. The present invention provides a golf ball having a paint film on a surface of a golf ball body, wherein the paint film is obtained by curing a paint composition comprising an aqueous polyol having a carboxyl group, an aqueous polycarbodiimide, and an aqueous polyisocyanate.

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What is claimed is: 1. A golf ball comprising a golf ball body, and a paint film covering the golf ball body, wherein the golf ball body comprises a cover and a resin component constituting the cover, said resin having a urethane bond or a carboxyl group, and the paint film is obtained by curing a

What is claimed is: 1. A golf ball comprising a golf ball body, and a paint film covering the golf ball body, wherein the golf ball body comprises a cover and a resin component constituting the cover, said resin having a urethane bond or a carboxyl group, and the paint film is obtained by curing a paint composition comprising a water soluble or water dispersible polyol having a carboxyl group, a water soluble or water dispersible polycarbodiimide having a hydrophilic segment, and a polyisocyanate modified with polyoxyalkylene ether alcohol to be water soluble or water dispersible. 2. The golf ball according to claim 1, wherein the aqueous polyol having the carboxyl group is a mixture of a water soluble or water dispersible polyester polyol and a water soluble or water dispersible acrylic polyol. 3. The golf ball according to claim 1, wherein the resin having the carboxyl group is an ionomer resin. 4. The golf ball according to claim 1, wherein the resin having the urethane bond is polyurethane. 5. The golf ball according to claim 1, wherein the polycarbodiimide has a carbodiimide equivalent of from 100 to 600. 6. The golf ball according to claim 1, wherein the polyol having the carboxyl group has OH value of from 25 mg KOH/g to 100 mg KOH/g (exclusive). 7. The golf ball according to claim 1, wherein the polyol having the carboxyl group has an acid number of from 10 mg KOH/g to 50 mg KOH/g. 8. The golf ball according to claim 1, wherein the blending ratio of the aqueous polycarbodiimide to the polyol having the carboxyl group is ranging from 0.1 to 1.5 at the molar ratio of a carbodiimide group to a carboxyl group (carbodiimide group/carboxyl group). 9. The golf ball according to claim 1, wherein the polycarbodiimide is a polycarbodiimide resin represented by the following chemical formula (1): wherein R is a residue where isocyanate groups are removed from diisocyanate, K is a bond formed by a reaction of isocyanate group and a hydrophilic segment, and "n" is an average degree of polymerization and is an integer ranging from 2 to 100. 10. The golf ball according to claim 9, wherein the polycarbodiimide resin is a polytetramethyl xylyene carbodiimide or a polydicyclohexylmethane carbodiimide. 11. A golf ball comprising a golf ball body, and a paint film covering the golf ball body, wherein the golf ball comprises a cover, and a resin component constituting the cover, said resin having a urethane bond or a carboxyl group, and the paint film is obtained by curing a paint composition comprising a water soluble or water dispersible polyol having a carboxyl group with an acid number of from 10 mg KOH/g to 50 mg KOH/g; a water soluble or water dispersible polycarbodiimide resin having a hydrophilic segment and a carbodiimide equivalent of from 100 to 600, represented by the following formula (1); a polyisocyanate modified with polyoxyalkylene ether alcohol to be water soluble or water dispersible; and a blending ratio of the polycarbodiimide resin to the aqueous polyol having the carboxyl group is ranging from 0.1 to 1.5 at a molar ratio of a carbodiimide group to a carboxyl group (carbodiimide group / carboxyl group); wherein R is a residue where isocyanate groups are removed from diisocyanate, K means a bond formed by a reaction of isocyanate group and a hydrophilic segment, and "n" means an average degree of polymerization and is an integer ranging from 2 to 100. 12. The golf ball according to claim 11, wherein the resin having the carboxyl group is an ionomer resin. 13. The golf ball according to claim 11, wherein the resin having the urethane bond is polyurethane. 14. The golf ball according to claim 11, wherein the polyol having the carboxyl group has OH value of from 25 mg KOH/g to 100mg KOH/g (exclusive). 15. The golf ball according to claim 11, wherein the polyol having the carboxyl group is a mixture of a water soluble or water dispersible polyester polyol and a water soluble or water dispersible acrylic polyol.