| 摘要 |
<p>PROBLEM TO BE SOLVED: To give a golf ball an excellent flying performance, good controllability, high durability, and an extremely soft impact feeling. SOLUTION: A surrounding layer 2 and intermediate layer 3 have a Shore D hardness from 10 to 50, where the surrounding layer 2 has a larger one than the intermediate layer 3. A cover 4 is mainly made up of a thermoplastic resin mixed with an inorganic filler. A solid core 1 has a hardness that exhibits deformation A from 2.5 to 7.0 mm under a load of 100 kg. Under a load of 100 kg. one sphere consisting of the solid core 1 covered in the surrounding layer 2, another consisting of the above sphere further covered in the intermediate layer 3, and the complete ball exhibit respective deformation values B, C and D all measured in millimeters, which satisfy relations: 0.85<=B/A<=1.15, 0.85<=C/B<=1.15, 0.7<=D/C<=1.0.</p> |
