Golf ball and method of manufacture
AssigneeBridgestone Sports Co., Ltd.
InventorAtsushi Komatsu
Life of this patent
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Abstract
A golf ball is provided which suppresses twisting due to external forces while maintaining sufficient deflection at the time of impact, reduces the spin rate without lowering ball rebound, and is thus able to effectively increase the distance traveled by the ball, particularly on shots with a driver. In the golf ball, which includes a core and a cover, the core has a core body made of a first polybutadiene rubber and having a surface with a plurality of groves or holes thereon, which grooves or holes are filled with a second polybutadiene rubber of a differing composition from the first polybutadiene rubber. The polybutadiene rubber-filled groove portions or hole portions have a higher surface hardness than the core body.
Claims4
A method for manufacturing a golf ball comprising a core and a cover, wherein the core has a core body made of a first polybutadiene rubber and having a surface with a plurality of grooves or holes thereon, which grooves or holes are filled with a second polybutadiene rubber of a differing composition from the first polybutadiene rubber, and wherein the polybutadiene rubber-filled groove portions or hole portions have a higher surface hardness than the core body, comprising the steps of:
- producing a core body that is made of a first polybutadiene rubber and has a surface with a plurality of grooves or holes thereon;
- filling the grooves or holes formed at the surface of the core body with a second polybutadiene rubber having a higher hardness than the surface hardness of the core body so as to produce a core having a smooth spherical surface;
- and
- forming a cover around the core, either directly on the core or over an intervening intermediate layer.
Dependencies are inferred from the claim text.