Patent ID: 6814675
Filing Date: 2004-11-09
Classification: A63B,C08G

Abstract:
A multi-piece golf ball comprising:a core comprising a center and an intermediate layer formed on the center, and a cover covering the core and having multiple dimples on the surface thereof, said center having a diameter of 25 to 40 mm, and a surface hardness in Shore D hardness of the center being higher than a central point hardness in Shore D hardness of the center by not more than 5, said intermediate layer having a thickness in the range of 0.5 to 8.0 mm, and the surface hardness in Shore D hardness of the intermediate layer is higher than the central point hardness of the center by 3 to 25, said cover comprising polyurethane-based thermoplastic elastomer as a major component and having a Shore D hardness lower than the surface hardness of said intermediate layer by 0 to 15, wherein said dimples on said cover have a ratio of dimple occupying area on said surface of from 0.758 to 0.853, and wherein the periphery of said dimples in mm is represented by X and a ratio of the golf ball surface area occupied by said dimples to the total surface area of the golf ball is represented by Y, and X and Y satisfy the correlation represented by formula (1): X&lE;1495+3882Yâ€ƒâ€ƒ(1).