| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To achieve a single layer core that has a soft-to-hard gradient from the surface to the center in a golf ball, and to achieve a method of producing such a core efficiently and at a low cost. <P>SOLUTION: The golf ball has an inner core having a first outer surface and a geometric center and being formed from a substantially homogenous formulation such that the inner core has a hardness of 45 Shore C to 65 Shore C, and an outer core layer disposed about the inner core, having a second outer surface and an inner surface and being formed from a substantially homogenous formulation such that the outer core layer has a hardness of 55 Shore C to 90 Shore C. A cover layer is disposed about the outer core layer. The hardness of the first outer surface is the same as or lower than the hardness of the geometric center to define a "negative hardness gradient" and the hardness of the second outer surface is greater than the hardness of the inner surface to define a "positive hardness gradient". <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
