Golf ball

Abstract

An object of the present disclosure is to provide a golf ball having a lowered flight distance difference between flight distances on various numbered-iron shots. The present disclosure provides a golf ball comprising a spherical core, an intermediate layer covering the spherical core, and an outermost cover positioned outside the intermediate layer and having a plurality of dimples formed thereon, wherein the plurality of dimples have a total lower volume Vi of more than 365 mm3, and a slab hardness Hc (Shore D) of a cover composition constituting the outermost cover, a thickness Tc (mm) of the outermost cover and the total lower volume Vi (mm3) of the plurality of dimples satisfy a relationship of 8.5≤Tc/Hc×Vi.

1 . A golf ball comprising a spherical core, an intermediate layer covering the spherical core, and an outermost cover positioned outside the intermediate layer and having a plurality of dimples formed thereon, wherein
 the plurality of dimples have a total lower volume Vi of more than 365 mm 3 , and   a slab hardness Hc (Shore D) of a cover composition constituting the outermost cover, a thickness Tc (mm) of the outermost cover and the total lower volume Vi (mm 3 ) of the plurality of dimples satisfy a relationship of 8.5≤Tc/Hc×Vi.   
     
     
         2 . The golf ball according to  claim 1 , wherein the slab hardness Hc of the cover composition constituting the outermost cover ranges from 20 to 40 in Shore D hardness, and the thickness Tc of the outermost cover ranges from 0.4 mm to 1.0 mm. 
     
     
         3 . The golf ball according to  claim 1 , wherein the total lower volume Vi of the plurality of dimples is 380 mm 3  or more. 
     
     
         4 . The golf ball according to  claim 1 , wherein a hardness difference (Hms−Hcs) between a surface hardness Hms of the intermediate layer and a surface hardness Hcs of the golf ball is more than 0 in Shore C hardness. 
     
     
         5 . The golf ball according to  claim 1 , wherein a hardness difference (Hms−Hs) between a surface hardness Hms of the intermediate layer and a surface hardness Hs of the spherical core is more than 0 in Shore C hardness. 
     
     
         6 . The golf ball according to  claim 1 , wherein the cover composition constituting the outermost cover is a resin composition containing a polyurethane as a base resin. 
     
     
         7 . A golf ball comprising a spherical core, an intermediate layer covering the spherical core, and an outermost cover positioned outside the intermediate layer and having a plurality of dimples formed thereon, wherein
 the plurality of dimples have a total lower volume Vi of more than 365 mm 3 , and   a center hardness Ho (Shore C) of the spherical core, a surface hardness Hs (Shore C) of the spherical core, a slab hardness Hc (Shore D) of a cover composition constituting the outermost cover, a thickness Tc (mm) of the outermost cover and the total lower volume Vi (mm 3 ) of the plurality of dimples satisfy a relationship of {(Hs−Ho)/(Vi×Tc/Hc)}<2.1.   
     
     
         8 . The golf ball according to  claim 7 , wherein a hardness difference (Hs−Ho) between the surface hardness Hs of the spherical core and the center hardness Ho of the spherical core is less than 20 in Shore C hardness. 
     
     
         9 . The golf ball according to  claim 7 , wherein the total lower volume Vi of the plurality of dimples is 380 mm 3  or more. 
     
     
         10 . The golf ball according to  claim 7 , wherein the slab hardness Hc of the cover composition constituting the outermost cover ranges from 20 to 40 in Shore D hardness, and the thickness Tc of the outermost cover ranges from 0.4 mm to 1.0 mm. 
     
     
         11 . The golf ball according to  claim 7 , wherein a hardness difference (Hms−Hcs) between a surface hardness Hms of the intermediate layer and a surface hardness Hcs of the golf ball is more than 0 in Shore C hardness. 
     
     
         12 . The golf ball according to  claim 7 , wherein a hardness difference (Hms−Hs) between a surface hardness Hms of the intermediate layer and the surface hardness Hs of the spherical core is more than 0 in Shore C hardness. 
     
     
         13 . The golf ball according to  claim 7 , wherein the cover composition constituting the outermost cover is a resin composition containing a polyurethane as a base resin. 
     
     
         14 . A golf ball comprising a spherical core, an intermediate layer covering the spherical core, and an outermost cover positioned outside the intermediate layer and having a plurality of dimples formed thereon, wherein
 a center hardness Ho (Shore C hardness) of the spherical core,   a surface hardness Hs (Shore C hardness) of the spherical core,   a hardness difference S=Hs−Ho,   a material hardness Hm (Shore D hardness) of the intermediate layer, and   a total lower volume Vi (mm 3 ) of the plurality of dimples satisfy   a relationship of S×Hm/Vi<2.4.   
     
     
         15 . The golf ball according to  claim 14 , wherein 0.35<(H10−Ho)/S<0.6 is satisfied where H10 is a hardness at a 10 mm point from a center of the spherical core. 
     
     
         16 . The golf ball according to  claim 14 , wherein the hardness difference S<20. 
     
     
         17 . The golf ball according to  claim 14 , wherein Vi>365. 
     
     
         18 . The golf ball according to  claim 14 , wherein Vi>380. 
     
     
         19 . The golf ball according to  claim 14 , wherein the surface hardness (Shore C hardness) of the spherical core <a surface hardness (Shore C hardness) of the intermediate layer> a surface hardness (Shore C hardness) of the golf ball is satisfied. 
     
     
         20 . The golf ball according to  claim 14 , wherein the outermost cover contains a polyurethane as a resin component.