Patent ID: 8905859

Claim:
A solid golf ball comprising a core and a cover, wherein the core is formed of a rubber composition comprising a base rubber, a co-crosslinking agent, a crosslinking initiator and a metal oxide, the co-crosslinking agent being methacrylic acid and the rubber composition including from 0.05 to 60 parts by weight of powders each of which has a particle size of not more than 3 mm and which consist of the combination of (I) a rubber powder and (II) a polyurethane resin powder per 100 parts by weight of the base rubber, where the rubber powder (I) is selected from the group consisting of (I-a) a rubber powder obtained by granulating a rubber material containing methacrylic acid or a metal salt thereof and (I-b) a rubber powder obtained by granulating a rubber material containing acrylic acid or a metal salt of acrylic acid, and the polyurethane resin powder (II) is composed primarily of a thermoplastic polyurethane; the core has a deflection when compressed under a final load of 1,275 N (130 kgf) from an initial load of 98 N (10 kgf) of from 2.0 to 7.0 mm; the cover is formed of a resin material having a breaking strength of from 20 to 80 MPa and an elongation of from 150 to 600%; and letting CH be the deflection (mm) by the core when compressed under a final load of 1,275 N (130 kgf) from an initial load of 98 N (10 kgf) and BH1 be the deflection (mm) by the ball when compressed under a final load of 1,275 N (130 kgf) from an initial load of 98 N (10 kgf), the ratio CH/BH1 is from 0.95 to 1.1.