Patent ID: 6712717
Filing Date: 2004-03-30
Classification: A63B

Abstract:
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&gE;0.100, and the ball satisfies COR50&gE;0.740 and COR25-COR50&gE;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.