申请人:Dunlop Sports Co., Ltd.
公开号:EP3156441A1
公开(公告)日:2017-04-19
A golf ball 2 includes a core 4, a first mid layer 6, a second mid layer 8, and a cover 12. The core 4 includes a center 18 and an envelope layer 20. The center 18 is formed by crosslinking a first rubber composition, and the envelope layer 20 is formed by crosslinking a second rubber composition. The first rubber composition or the second rubber composition includes a base rubber, a co-crosslinking agent, a crosslinking initiator, and an acid and/or a salt. The co-crosslinking agent is:
(1) an α, β-unsaturated carboxylic acid having 3 to 8 carbon atoms; and/or
(2) a metal salt of an α,β-unsaturated carboxylic acid having 3 to 8 carbon atoms.
A hardness Hm2 of the second mid layer 8 is greater than a hardness Hm1 of the first mid layer 6. The hardness Hm2 is greater than a hardness Hc of the cover 12.
高尔夫球 2 包括球芯 4、第一中层 6、第二中层 8 和外层 12。球芯 4 包括中心 18 和包层 20。中心 18 由第一种橡胶组合物交联形成,包层 20 由第二种橡胶组合物交联形成。第一种橡胶组合物或第二种橡胶组合物包括基础橡胶、共交联剂、交联引发剂以及酸和/或盐。共交联剂为
(1) 具有 3 至 8 个碳原子的 α、β-不饱和羧酸;和/或
(2) 具有 3 至 8 个碳原子的 α、β-不饱和羧酸的金属盐。
第二中间层 8 的硬度 Hm2 大于第一中间层 6 的硬度 Hm1。硬度 Hm2 大于盖板 12 的硬度 Hc。