Golf ball

摘要

A golf ball 2 includes a core 4, a mid layer 6, and a cover 8. The core 4 includes a center 10 and an envelope layer 12. The ratio of the volume Ve of the core 4 to the volume of a phantom sphere of the golf ball 2 is equal to greater than 76%. The ratio (Co/Ce) of an amount of compressive deformation Co of the center 10 to an amount of compressive deformation Ce of the core 4 is greater than 2.0 but less than 3.0. The ratio (Vo/Ve) of the volume Vo of the center 10 to the volume Ve of the core 4 is equal to or greater than 0.01 but equal to or less than 0.13.

主权项

1. A golf ball comprising
a core, a mid layer positioned outside the core, and a cover formed from a resin composition and positioned outside the mid layer, a principal component of the base material of the cover resin composition being a polyurethane, wherein said polyurethane is formed from a polyol that is a polytetramethylene ether glycol having a number average molecular weight of 1500 or less, wherein the core comprises a center and an envelope layer positioned outside the center, wherein a thickness of the envelope layer is equal to or greater than 8 mm but equal to or less than 18 mm, a ratio of a volume Ve of the core to a volume of a phantom sphere of the golf ball is equal to or greater than 76%, and a ratio (Co/Ce) of an amount of compressive deformation Co of the center, which is measured under conditions of an initial load of 98 N and a final load of 294 N, to an amount of compressive deformation Ce of the core, which is measured under conditions of an initial load of 98 N and a final load of 294 N, is greater than 2.0 but less than 3.0.