Golf ball material and golf ball using the same
AssigneeSRI Sports Limited
InventorsKazuyoshi Shiga, Toshiyuki Tarao, Keiji Ohama
Life of this patent
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Abstract
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 2.11×107 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.
Claims13
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 2.11×107 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.
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 2.11×107 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.
Dependencies are inferred from the claim text.