US 12,465,818 B2
Multi-piece solid golf ball
Hideo Watanabe, Chichibushi (JP)
Assigned to Bridgestone Sports Co., Ltd., Tokyo (JP)
Filed by Bridgestone Sports Co., Ltd., Tokyo (JP)
Filed on Nov. 11, 2021, as Appl. No. 17/524,281.
Application 17/524,281 is a continuation in part of application No. 16/943,406, filed on Jul. 30, 2020, granted, now 11,202,939.
Application 16/943,406 is a continuation in part of application No. 16/194,871, filed on Nov. 19, 2018, granted, now 10,765,917, issued on Sep. 8, 2020.
Application 16/194,871 is a continuation in part of application No. 15/948,267, filed on Apr. 9, 2018, granted, now 10,512,823, issued on Dec. 24, 2019.
Claims priority of application No. 2017-085059 (JP), filed on Apr. 24, 2017.
Prior Publication US 2022/0062715 A1, Mar. 3, 2022
Int. Cl. A63B 37/06 (2006.01); A63B 37/00 (2006.01)
CPC A63B 37/00922 (2020.08) [A63B 37/0033 (2013.01); A63B 37/0045 (2013.01); A63B 37/0051 (2013.01); A63B 37/0063 (2013.01); A63B 37/0064 (2013.01); A63B 37/0065 (2013.01); A63B 37/0075 (2013.01); A63B 37/0084 (2013.01); A63B 37/0012 (2013.01); A63B 37/0018 (2013.01); A63B 37/0019 (2013.01); A63B 37/002 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A multi-piece solid golf ball comprising a core, an intermediate layer encasing the core and a cover which encases the intermediate layer and has numerous dimples formed on an outside surface thereof (ball surface), wherein the core is formed of a rubber composition that includes compounding ingredients (I) to (IV),
(I) a base rubber
(II) an organic peroxide
(III) water and/or a metal monocarboxylate, and
(IV) sulfur,
the intermediate layer is formed of a resin material, the cover is formed of a urethane resin material, the core has a diameter of at least 38.0 mm, the core has a deflection when compressed under a final load of 1,275 N (130 kgf) from an initial load of 98 N (10 kgf) of at least 3.9 mm, a sphere obtained by encasing the core with the intermediate layer (intermediate layer-encased sphere) has a surface hardness on the Shore D hardness scale of at least 69, the ball has a surface hardness on the Shore D hardness scale of 62 or less, and the (intermediate layer thickness)/(core diameter) value is from 0.025 to 0.043, the (cover thickness)/(core diameter) value is from 0.014 to 0.027,
wherein the weight ratio between component (IV) and component (III), expressed as (IV)/(III) value, is from 0.010 to 0.200.