Golf ball material and golf ball using the same
View Patent ↗An object of the present invention is to provide a golf ball which travels a great distance on the driver shots and stops quickly on the green on the approach shots. The present invention is directed to a golf ball material having a shear loss modulus G″ of 2.11×10 7 Pa or less, and a ratio (E″/G″) of a tensile loss modulus E″ to the shear loss modulus G″ of 1.78 or more, when measuring the shear loss modulus G″ in a shear mode and the tensile loss modulus E″ in a tensile mode at conditions of a temperature of 0° C., oscillation frequency of 10 Hz using a dynamic viscoelasticity measuring apparatus.
1. A golf ball cover material comprising a polyurethane as a resin component, wherein said polyurethane is formed from a polyether polyol with a number average molecular weight ranging from 200 to 3,000 and a hydroxyl value ranging from 94 mgKOH/g to 561 mgKOH/g as a polyol component, and
wherein said golf ball cover material has a shear loss modulus G″ of 2.11×10 7 Pa or less, and a ratio (E″/G″) of a tensile loss modulus E″ to the shear loss modulus G″ of 1.78 or more, when measuring the shear loss modulus G″ in a shear mode and the tensile loss modulus E″ in a tensile mode at conditions of a temperature of 0° C., oscillation frequency of 10 Hz using a dynamic viscoelasticity measuring apparatus.
2. The golf ball cover material according to claim 1 , wherein the polyurethane has polytetramethylene ether glycol as a polyol component.
3. The golf ball cover material according to claim 1 , wherein the polyurethane has a non-yellowing type polyisocyanate as a polyisocyanate component.
4. The golf ball cover material according to claim 1 , wherein the polyurethane has dicyclohexylmethane diisocyanate as a polyisocyanate component.
5. The golf ball cover material according to claim 1 , wherein the polyurethane has a chain extender having a molecular weight ranging from 30 to 400.
6. The golf ball cover material according to claim 1 , wherein the polyurethane has 1,4-butane diol as a chain extender component.
7. A golf ball comprising a core and a cover a constituting members,
wherein the cover is formed from a golf ball cover material comprising a polyurethane as a resin component and wherein said golf ball cover material has a shear loss modulus G″ of 2.11×10 7 Pa or less, and a ratio (E″/G″) of a tensile loss modulus E″ to the shear loss modulus G″ of 1.78 or more, when measuring the shear loss modulus G″ in a shear mode and the tensile loss modulus E″ in a tensile mode at conditions of a temperature of 0° C., oscillation frequency of 10 Hz using a dynamic viscoelasticity measuring apparatus, and
wherein said polyurethane is formed from a polyether polyol with a number average molecular weight ranging from 200 to 3,000 and a hydroxyl value ranging from 94 mgKOH/g to 561 mgKOH/g as a polyol component.
8. The golf ball according to claim 7 , wherein the polyurethane has polytetramethylene ether glycol as a polyol component.
9. The golf ball according to claim 7 , wherein the polyurethane has dicyclohexylmethane diisocyanate as a polyisocyanate component.
10. The golf ball according to claim 7 , wherein the polyurethane has a chain extender having a molecular weight ranging from 30 to 400.
11. The golf ball according to claim 7 , wherein the core has a hardness difference ranging from 10 to 40 in JIS-C hardness between a surface hardness and a center hardness thereof.
12. The golf ball according to claim 7 , wherein the cover has a slab hardness ranging from 5 to 80 in Shore D hardness.
13. The golf ball according to claim 7 , wherein the cover has a thickness ranging from 0.3 mm to 2.0 mm.