Patent ID: 7288031
Filing Date: 2007-10-30
Classification: A63B

Abstract:
1. A golf ball, comprising a core, an intermediate layer enclosing the core to form a sphere, and a cover enclosing the intermediate layer, wherein each component has a Shore D hardness, a Deflection amount, an initial velocity (in m/s) and a thickness (in mm), the Deflection amount being defined as an amount of deflection (in mm) under load of a spherical body incurred when the load is increased from an initial value of 98 N (10 kgf) to a final value of 1275 N (130 kgf), and the ball satisfies the following requirements (1) to (4): (1) (Shore D hardness of the cover)−(Shore D hardness of the intermediate layer)>0, (2) (initial velocity of the sphere)−(initial velocity of the core)>0, (3) 0.90≦(Deflection amount of the sphere)/(Deflection amount of the core)≦1.00, and (4) the total of the thickness of the intermediate layer and the thickness of the cover is up to 3.0 mm, wherein said intermediate layer comprises wherein said intermediate layer further comprises: wherein the ionomer resin (A) and the non-ionomeric thermoplastic elastomer (B) in a weight ratio A/B between 100/0 and 50/50 are 100 parts by weight.