Two-piece golf ball

Abstract

A two-piece golf ball includes a core and a cover having a thickness of 1.0 to 3.0 mm. The core is made from a rubber composition containing a main rubber component which mainly contains polybutadiene. The cover is made from a material mainly containing an ionomer resin in which at least one kind of silicone powder selected from a silicone rubber powder, a silicon resin powder, and a composite powder thereof is dispersedly blended. The core has a hardness corresponding to a deflection in a range of 3.3 to 6.0 mm under an applied load of 100 kg. The cover has a Dulometer D hardness in a range of 55 to 70. Dimples of the number of 300 to 550 pieces are formed in the surface of said golf ball in such a manner that a dimple total volume ratio VR, which is a ratio of the total of volumes of dimple spaces under the planes surrounded by edges of the dimples in the surface of said gold ball to the total volume of a virtual ball as a result of assumption that no dimple is formed in the surface of said golf ball, is in a range of 0.85% or less. The two-piece golf ball is excellent in resilience, flight distance characteristic, durability, and feel of hitting.

Dependencies are inferred from the claim text.