US 11,806,583 B2
Rubber composition for golf ball core, and golf ball
Jun Shindo, Saitamaken (JP)
Assigned to Bridgestone Sports Co., Ltd., Tokyo (JP)
Filed by Bridgestone Sports Co., Ltd., Tokyo (JP)
Filed on Dec. 17, 2021, as Appl. No. 17/644,828.
Claims priority of application No. 2020-216482 (JP), filed on Dec. 25, 2020.
Prior Publication US 2022/0203174 A1, Jun. 30, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. A63B 37/06 (2006.01); A63B 37/00 (2006.01)
CPC A63B 37/0051 (2013.01) [A63B 37/0024 (2013.01); A63B 37/0031 (2013.01); A63B 37/0039 (2013.01); A63B 37/0062 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A golf ball comprising a core of one or more layers and a cover of one or more layers encasing the core, wherein at least one layer of the core is formed of the rubber composition comprising:
(a) a conjugated diene polymer,
(b) a copolymer of a conjugated diene compound and a non-conjugated olefin, and
(c) an organic peroxide, and
wherein the core has, in an internal hardness profile thereof, a hardness difference between a surface and a center of the core that is at least 15 on the JIS-C hardness scale, and
wherein water is included in the rubber composition and the water content per 100 parts by weight of the rubber component is from 0.1 to 10 parts by weight.