公开(公告)号：US09573021B2

公开(公告)日：2017-02-21

申请号：US14672648

申请日：2015-03-30

Applicant: DUNLOP SPORTS CO., LTD.

Inventor： Ryota Sakamine ,  Katsumi Terakawa

IPC: A63B37/02 ,  C08L9/00 ,  A63B37/00

CPC classification number: A63B37/0051 ,  A63B37/0062 ,  A63B37/0063 ,  A63B37/0074 ,  A63B37/0076 ,  C08L9/00 ,  C08L2205/22

Abstract: An object of the present invention is to provide a golf ball excellent in shot feeling, flight distance and durability. The present invention provides a golf ball comprising a spherical core and at least one cover layer covering the spherical core, wherein the spherical core is formed from a core rubber composition containing (a) a base rubber, (b) a co-crosslinking agent, (c) a crosslinking initiator, and (x) a crosslinked rubber powder; (x) the crosslinked rubber powder contains (x1) soft particles with a hardness difference (Hs−Hp)between a particle hardness (Hp) of the soft particles and a surface hardness (Hs) of the spherical core being 20 or more in JIS-C hardness, and a hardness difference (Hs5−Hp) between the particle hardness (Hp) of the soft particles and a hardness (Hs5) at 5 mm point inside the surface of the spherical core being 15 or more in JIS-C hardness; and the core rubber composition contains (x1) the soft particles in an amount of 1.0 mass % or more.

Abstract translation: 本发明的目的是提供一种射击感，飞行距离和耐久性优异的高尔夫球。 本发明提供一种高尔夫球，其包括球形芯和覆盖球形芯的至少一个覆盖层，其中球形芯由芯橡胶组合物形成，所述芯橡胶组合物包含（a）基础橡胶，（b）共交联剂， （c）交联引发剂，和（x）交联橡胶粉末; （x）交联橡胶粉末含有软质颗粒的颗粒硬度（Hp）与球形芯的表面硬度（Hs）之间的硬度差（Hs-Hp）在JIS中为20以上的（x1）软质颗粒 -C硬度和软质粒子的粒子硬度（Hp）与球状核心表面的5mm点处的硬度（Hs5）之间的硬度差（Hs5-Hp）在JIS-C硬度中为15以上 ; 核心橡胶组合物含有（x1）1.0质量％以上的软质粒子。