公开(公告)号：US09694243B2

公开(公告)日：2017-07-04

申请号：US14473611

申请日：2014-08-29

Applicant: Dunlop Sports Co., Ltd.

Inventor： Chiemi Mikura ,  Ayaka Shindo ,  Mikio Yamada

IPC: A63B37/00 ,  A63B37/02 ,  C08K5/37 ,  C08K5/375

CPC classification number: A63B37/0063 ,  A63B37/0051 ,  A63B37/0062 ,  A63B37/0074 ,  A63B37/0096 ,  C08K5/37 ,  C08K5/375 ,  C08K5/09 ,  C08L9/00 ,  C08K3/22

Abstract: An object of the present invention is to provide a golf ball showing a low spin rate on driver shots and an excellent shot feeing. The present invention provides a golf ball having a spherical core and at least one cover covering the spherical core, wherein the spherical core is formed from a rubber composition containing: (a) a base rubber, (b) an α,β-unsaturated carboxylic acid having 3 to 8 carbon atoms and/or a metal salt thereof as a co-crosslinking agent, (c) a crosslinking initiator, and at least one compound of (d) mercaptobenzoic acids and/or salts thereof, provided that the rubber composition further contains (e) a metal compound in the case of containing only (b) the α,β-unsaturated carboxylic acid having 3 to 8 carbon atoms as the co-crosslinking agent, and the spherical core has a hardness difference (Hs−Ho) between a surface hardness (Hs) and a center hardness (Ho) thereof of 20 or more in JIS-C hardness.