| 摘要 |
Golf ball 2 has a spherical core 4 , a mid layer 6 covering this core 4 , a reinforcing layer 8 covering this mid layer 6 , and a cover 10 covering this reinforcing layer 8 . Base polymer of the mid layer 6 includes a styrene block-containing thermoplastic elastomer and an ionomer resin. The mid layer 6 has a hardness as measured with a Shore D type hardness scale of equal to or less than 54. The mid layer 6 has a thickness of 0.5 mm or greater and 1.6 mm or less. Base polymer of the reinforcing layer 8 is a reaction product between carboxyl group-containing polyurethane and polycarbodiimide. Principal component of the base polymer of the cover 10 is an ionomer resin. The cover 10 has a hardness as measured with a Shore D type hardness scale hardness of equal to or greater than 55. The cover 10 has a thickness of equal to or less than 1.2 mm.
|
