Patent ID: 7118494

Claim:
A multi-piece solid golf ball comprised of a solid core, at least one intermediate layer and a cover, which golf ball is characterized in that the core is made of a molded and vulcanized material obtained by vulcanizing a rubber composition comprising (A) a base rubber that includes (a-1) a methacryloxy- and/or acryloxy-modified silicone polymer, and comprising also an unsaturated carboxylic acid and/or a metal salt thereof, an organic peroxide and an inorganic filler, and has a diameter of 30 to 40 mm and a deflection under a 980 N (100 kg) load of 2.5 to 6.0 mm; the intermediate layer is made primarily of a thermoplastic resin and has a thickness of 0.5 to 2.5 mm and a surface Shore D hardness of 45 to 75; the cover has a thickness of 0.2 to 2.5 mm and a surface Shore D hardness of 40 to 63 which is lower than the surface Shore D hardness of the intermediate layer; and the golf ball has a deflection under a 980 N (100 kg) load of 2.0 to 4.0 mm.