Patent ID: 7063631

Claim:
A golf ball comprising at least one layer of a core and a cover covering the core, wherein the cover is formed from a material having a value of the maximum load of 1.5 to 3.0 kN at an impact energy of 47.3 J in penetration and impact fatigue tests, and the cover material is selected from the group consisting of polyurethane-based thermoplastic elastomer; thermosetting polyurethane composition; thermoplastic elastomer other than polyurethane-based thermoplastic elastomer; and mixtures thereof, an innermost layer of the core being formed from a rubber composition comprising cis-1,4-polybutadiene, and the core has a deformation amount when applying an initial load of 98 N to a final load of 1275 N of 2.5 to 4.5mm, a hardness distribution such that the center point is the softest and the outer portion has higher hardness in order, a hardness difference in Shore D hardness between the center hardness and surface hardness of 15 to 45, a center hardness in Shore D hardness of 20 to 50, and a surface hardness in Shore D hardness of 45 to 72.