Patent ID: 6726578
Filing Date: 2004-04-27
Classification: A63B

Abstract:
A two-piece golf ball comprising:a core made from a rubber composition mainly containing polybutadiene; and a cover having a thickness of 0.5 to 2.5 mm, said cover being 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 mainly containing an ionomer resin; wherein said core has a hardness corresponding to a deflection in a range of 3.0 to 5.5 mm under an applied load of 100 kg; said cover has a Durometer D hardness in a range of 45 to 55; and dimples of a 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 a total of volumes of dimple spaces under planes surrounded by edges of the dimples in the surface of said golf ball to a 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.