| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a golf ball of optimizing a dynamic material at the condition that resembles in actual hitting and heightening the rebound performance and feeling. SOLUTION: The golf ball is composed of a core layer 1 and a cover layer 3 that covers on the core layer 1. The cover layer 3 is made of synthetic resin composition of matter. For the cover layer 3, the Young's modulus, which is measured by the Split-Hopkinson bar tester that is 14.0 m/s of its impact speed of hitting bar, is 100 MPa<=, 350 MPa>=. For the cover layer 3, the loss factor, which is measured by the Split-Hopkinson bar tester that is 14.0 m/s of its impact speed of hitting bar, is 0.2 MPa<=, 0.45 MPa>=.</p> |
