| abstract |
The golf ball 2 includes a core 4, an intermediate layer 6, a reinforcing layer 8, and a cover 10. The core (4) comprises a center (12) and a surrounding layer (14). The surrounding layer 14 is formed by crosslinking the rubber composition. The rubber composition comprises 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, β-unsaturated carboxylic acid having 3 to 8 carbon atoms, or (b2) a metal salt of an α, β-unsaturated carboxylic acid having 3 to 8 carbon atoms. |