Patent ID: 6758765
Filing Date: 2004-07-06
Classification: A63B,C08L

Abstract:
A multi-piece golf ball comprising:a core having a diameter of 30 to 40 mm, said core being made from a rubber composition mainly containing polybutadiene; at least one intermediate layer including the outermost layer having a thickness of 0.5 to 2.0 mm, said outermost layer being made from a resin material containing an ionomer resin in an amount of 30% by weight or more; and a cover having a thickness of 0.5 to 2.0 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 containing an ionomer resin in an amount of 50% by weight or more; wherein the hardness of said cover is smaller than the hardness of said outermost layer of said at least one intermediate layer and is larger than the hardness of a center portion of said core, and wherein the center portion of said core has a Durometer D hardness in a range of 25 to 45 and a surface portion of said core has a Durometer D hardness in a range of 30 to 55 which is larger than the center portion of said core.