Golf ball
To provide a golf ball that can prevent a decrease in carry distance of a driver shot when it rains and also, can exert excellent spinning performance upon an approach shot. The golf ball of the present invention includes a core, a cover that is provided on an outer side of the core and has dimples, and an outermost layer that is formed on an outer side of the cover and made of a material having a contact angle of 90° or more, the golf ball having a dynamic friction coefficient of 0.52 or more. The cover may be formed of thermoplastic polyurethane having hardness of 55 or more in terms of Shore D Hardness. The outermost layer may be formed of a urethane coating containing a water repellent additive, as a main component.
1. A golf ball comprising a core, a cover that is provided on an outer side of the core and has dimples, and an outermost layer that is formed on an outer side of the cover and made of a material having a contact angle of 90° or more, wherein the golf ball has a dynamic friction coefficient of 0.52 or more,
wherein a material for the outermost layer comprises a urethane coating that contains a water repellent additive, an amount of the water repellent additive being in a range from 0.1-10 mass % with respect to a total amount of a main agent including a solvent of the urethane coating,
wherein the main agent of the urethane coating comprises two polyester polyols (A) and (B) having different weight average molecular weights (Mw),
wherein the polyester polyol (A) has a weight average molecular weight (Mw) of 20,000-30,000 and the polyester polyol (B) has a weight average molecular weight (Mw) of 800-1,500, and
wherein an amount of the polyester polyol (A) is 20-30 mass % with respect to a total amount of the main agent including a solvent of the urethane coating and an amount of the polyester polyol (B) is 2-18 mass % with respect to a total amount of the main agent including a solvent of the urethane coating.
2. The golf ball according to claim 1 , wherein the cover is formed of a material having hardness of 55 or less in terms of Shore D Hardness.
3. The golf ball according to claim 1 , wherein a material for the cover comprises thermoplastic polyurethane.
4. The golf ball according to claim 1 , wherein the outermost layer has a thickness of 8-20 μm.
5. The golf ball according to claim 1 , wherein the water repellent additive is a fluoride-based water repellent agent where a fluoropolymer has an alkyl group chain length of 7 bonds or less.