DURABLE LARGE AND REGULATION-WEIGHT GOLF BALL INCORPORATING FOAMED INTERMEDIATE LAYER

To provide large diameter golf balls having at least one foamed intermediate layer.SOLUTION: For example, a golf ball has a weight of 45.93 g or less, an outer diameter of at least 4.318 cm, and a CoR of at least 0.700. The golf ball comprises: a core comprising a rubber composition and having a first specific gravity that is greater than 1.0 g/cc; and an intermediate layer having an outer diameter of 4.267 cm or more and comprising a foamed polyurethane composition and having a second specific gravity that is less than 1.0 g/cc; and a cover layer comprising a polyurethane composition and having a third specific gravity that is greater than 1.0 g/cc; where the first specific gravity is less than the third specific gravity.SELECTED DRAWING: None 【課題】少なくとも１つの発泡体中間層を有する大口径ゴルフボールが提供される。【解決手段】例えば、ゴルフボールの重量は４５．９３ｇ以下で、その外側直径は少なくとも４．３１８ｃｍで、そのＣＯＲは少なくとも０．７００である。このゴルフボールは、１．０ｇ／ｃｃより大きい第１の比重を具備しゴム組成物を有するコアと、４．２６７ｃｍ以上の外側直径を具備し発泡性ポリウレタン組成物からなり、１．０ｇ／ｃｃ未満の第２の比重を有する中間層と、ポリウレタン組成物を有し、１．０ｇ／ｃｃより大きい第３の比重を具備するカバー層とを有し、第１の比重が第３の比重よりも小さい。【選択図】なし