US 12,357,881 B2
Golf ball
Hidetaka Inoue, Kobe (JP); Mariko Hashinokuchi, Kobe (JP); and Kazuya Kamino, Kobe (JP)
Assigned to SUMITOMO RUBBER INDUSTRIES, LTD., Kobe (JP)
Filed by Sumitomo Rubber Industries, Ltd., Kobe (JP)
Filed on May 11, 2023, as Appl. No. 18/195,994.
Claims priority of application No. 2022-086868 (JP), filed on May 27, 2022; application No. 2022-086869 (JP), filed on May 27, 2022; and application No. 2022-086870 (JP), filed on May 27, 2022.
Prior Publication US 2023/0381595 A1, Nov. 30, 2023
Int. Cl. A63B 37/06 (2006.01); A63B 37/00 (2006.01); C08K 5/05 (2006.01)
CPC A63B 37/0063 (2013.01) [A63B 37/0031 (2013.01); A63B 37/0033 (2013.01); A63B 37/0043 (2013.01); A63B 37/0045 (2013.01); A63B 37/0087 (2013.01); C08K 5/05 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A golf ball comprising a spherical core and a cover covering the spherical core, wherein
when a straight line starting from a center of the spherical core and ending at a surface of the spherical core is divided into equal eight parts, a center hardness (C0), a hardness (C1) at 12.5% point from the center, a hardness (C2) at 25.0% point from the center, a hardness (C3) at 37.5% point from the center, a hardness (C4) at 50.0% point from the center, a hardness (C5) at 62.5% point from the center, a hardness (C6) at 75.0% point from the center, a hardness (C7) at 87.5% point from the center and a surface hardness (C8) of the spherical core in Shore C hardness satisfy the following relationship:
0<(C1−C0)≤6.0,
0<(C2−C1)≤6.0,
0<(C3−C2)≤6.0,
0<(C4−C3)≤6.0,
5.0≤(C5−C4),
0<(C6−C5)≤3.5,
0<(C7−C6)≤3.5,
0<(C8−C7)≤2.5, and
(C4−C0)>(C5−C4)>(C8−C5).