| 摘要 |
<p>PROBLEM TO BE SOLVED: To provided a manufacturing method for a core material of a golf ball capable of restraining increase in hardness near the surface, and having superior productivity. SOLUTION: This manufacturing method for a core material of a golf ball includes a process of forming unvulcanized plug from a rubber composition containing butadiene rubber, metal salt ofα,β-unsaturated carboxylic acid, an organic peroxide, and zinc oxide or magnesium oxide, and a process of vulcanization-molding the unvulcanized plug in a metal mold in the state where a free radical scavenger is existent on the surface of the unvulcanized plug and in its vicinity to form a core material of the golf ball.</p> |
