| 摘要 |
<p>PURPOSE:To improve the flying performance by forming the core ball of a golf ball from a rubber compound containing basic rubber, metal salt of unsaturated carboxylic acid, organic sulfur compound, and/or the metal containing organic sulfur compound. CONSTITUTION:A one-piece golf ball or the core ball of a multi-layered structure golf ball which is covered directly or through an intermediate layer by a covering material is formed with a rubber compound containing basic rubber metal salt of unsaturated carboxyl ic acid, organic sulfur compound and/or metal containing sulfur compound. As the basic rubber, 1, 4-polybutadiene rubber having cis-structure in 40% or more is used particularly preferably in point of view of high resiliency, extrusion workability, and high strength of a vulcanized rubber. Further, the metal salt of the unsaturated carboxylic acid is compounded as covalent bonding agent, and the zinc salt of acrylic acid or methacrylic acid is used preferably. Further, the compounding quantity of sulfur compound is preferably 0.05-2wt. parts for 100wt. parts of basic rubber, in particular 0.1-0.5wt.part. Thus, flying performance is improved.</p> |
