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 from an aqueous paint, and the paint film has an elongation at break of 80% or more and maximum stress of 170 kgf/cm 2 (16.7 MPa) or more.
1. A golf ball having a paint film on a surface of a golf ball body, wherein
the paint film is obtained by curing a two-component curing type aqueous urethane paint containing an aqueous polyol and an aqueous polyisocyanate,
the aqueous polyol is a mixture of an aqueous polyester polyol and an aqueous acrylic polyol wherein the mass ratio of the aqueous polyester polyol to the aqueous acrylic polyol ranges from 4:1 to 10:1, and
the paint film has an elongation at break of 80% or more and maximum stress of 170 kgf/cm 2 (16.7 MPa) or more.
2. The golf ball according to claim 1 , wherein the two-component curing type aqueous urethane paint contains an aqueous polyol and an aqueous polyisocyanate at a molar ratio of an isocyanate group of the aqueous polyisocyanate to a hydroxyl group of the aqueous polyol (NCO/OH) of from 1.2 to 2.0.
3. The golf ball according to claim 1 , wherein the aqueous polyisocyanate is an aqueous hexamethylene diisocyanate.
4. The golf ball according to claim 1 , wherein the aqueous polyol has hydroxyl value of from 25 mgKOH/g to 100 mgKOH/g (exclusive).
5. The golf ball according to claim 1 , wherein the aqueous polyol has a weight average molecular weight of 4,000 to 20,000.
6. The golf ball according to claim 1 , wherein the two-component curing type aqueous urethane paint contains a solvent.
7. The golf ball according to claim 6 , wherein the solvent is a film forming additive.
8. The golf ball according to claim 1 , wherein the golf ball body comprises a cover containing a urethane resin as a base resin.
9. A golf ball having a paint film on a surface of a golf ball body, wherein
the paint film is obtained by curing a two-component curing type aqueous urethane paint containing an aqueous polyol and an aqueous polyisocyanate at the molar ratio of an isocyanate group of the aqueous polyisocyanate to a hydroxyl group of the aqueous polyol (NCO/OH) of from 1.2 to 2.0,
the paint film has an elongation at break of 80% or more and maximum stress of 170 kgf/cm 2 (16.7 MPa) or more, and
the aqueous polyol is a mixture of an aqueous polyester polyol and an aqueous acrylic polyol at a mass ratio of the aqueous polyester polyol to the aqueous acrylic polyol equal to 4:1 to 10:1.
10. The golf ball according to claim 9 , wherein the golf ball body has a cover containing a urethane resin as a base resin.