Multi-piece golf ball

Abstract

A multi-piece golf ball includes a core having a diameter of 30 to 40 mm, at least one intermediate layer including the outermost layer having a thickness of 0.5 to 2.0 mm, and a cover having a thickness of 0.5 to 2.0 mm. The core is made from a rubber composition mainly containing polybutadiene. The outermost layer is made from a resin material containing an ionomer resin in an amount of 30% by weight or more. The cover is made from a material obtained by dispersedly blending at least one kind of silicone powder selected from a silicone rubber powder, a silicon resin powder, and a composite powder thereof, in a main resin component containing an ionomer resin in an amount of 50% by weight or more. The hardness of the outermost layer of the at least one intermediate layer is harder than the hardness of a center portion of the core. The hardness of the cover is harder than the hardness of the outermost layer of the at least one intermediate layer. A difference in hardness between the cover and the center portion of the core satisfies a relation of 10≦(Dulometer D hardness of cover−Dulometer D hardness of center portion of core≦40. The multi-piece golf ball is excellent in resilience, durability, and feel of hitting.

Dependencies are inferred from the claim text.