| 摘要 |
PROBLEM TO BE SOLVED: To provide a golf ball excellent in flight performance.SOLUTION: A golf ball 2 includes a core 4, an inner cover 6, and an outer cover 8. The core 4 includes a center 10, and an inner envelope layer 12. The center 10 is formed by a rubber composition being crosslinked. The inner envelope layer 12 is formed by the rubber composition being crosslinked. At least one of the rubber composition of the center 10 and the rubber composition of the inner envelope layer 12 includes: a base rubber (a); a co-crosslinking agent (b); a crosslinking initiator (c); and an acid and/or a salt (d). The co-crosslinking agent (b) is: (b1) an α, &bgr;-unsaturated carboxylic acid having 3 to 8 carbon atoms; or (b2) a metal salt thereof. The hardness Ho of the outer cover 8 is larger than the hardness Hs of the surface of the core 4. The hardness Ho is larger than the hardness Hi of the inner cover 6. |
