Solid golf ball
AssigneeBridgestone Sports Co., Ltd.
InventorsAtsushi Nakamura, Hisashi Yamagishi, Takashi Maruko
Life of this patent
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Abstract
In a solid golf ball comprising a solid core and a cover, provided that a coefficient of restitution at a firing velocity of v m/s is designated by CORv, a ball structure prior to formation of the cover satisfies COR25-COR50≧0.100, and the ball satisfies COR50≧0.740 and COR25-COR50≧0.09. The golf ball's performance depends little on the head speed so that the flight performance of the ball when hit at a low head speed is improved while the flight performance when hit at a high head speed is little deteriorated.
Claims7
A solid golf ball comprising a solid core, a cover, and an intermediate layer between the core and the cover,
- wherein the cover is made of thermoplastic elastomers selected from a group consisting of polyurethane elastomers, polyamide elastomers and polyester elastomers, and the intermediate layer is formed from a material consisting of ionomer resins,
- a coefficient of restitution at a firing velocity of v m/s is designated by CORv, a ball structure prior to formation of the cover satisfies COR25-COR50≧0.100, and the ball satisfies COR50≧0.740 and COR25-COR50≧0.09,
- the cover has a Shore D hardness of not greater than 327.61X+27.239 wherein X represents (COR25-COR50) of the ball structure prior to formation of the cover, and the intermediate layer has a Shore D hardness which is not greater than the hardness of the cover,
- the ball structure prior to formation of the cover undergoes a deflection of 2.8 to 5.0 mm under an applied load of 100 kg, and
- the solid golf ball has a contact area of 5.0 to 6.5 cm2 when fired at a firing velocity of 50 m/s.
Dependencies are inferred from the claim text.