Golf ball

Abstract

An object of the present disclosure is to provide a golf ball having a small difference in the flight distance on a driver shot when hit at a high head speed and when hit at a low head speed. The present disclosure provides a golf ball comprising a spherical core, an intermediate layer and an outermost cover, wherein when 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, a material hardness Hc (Shore D hardness) of the outermost cover, a thickness Tc (mm) of the outermost cover, and a total lower volume Vi (mm3) of a plurality of dimples satisfy Vi>365 and (Hc/Tc)×(S×Hm/Vi)≤130.

1 . A golf ball comprising a spherical core, an intermediate layer positioned outside 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,   a material hardness Hc (Shore D hardness) of the outermost cover,   a thickness Tc (mm) of the outermost cover, and   a total lower volume Vi (mm 3 ) of the plurality of dimples satisfy Vi>365 and (Hc/Tc)×(S×Hm/Vi)≤130.   
     
     
         2 . The golf ball according to  claim 1 , wherein when 0.35<(H10−Ho)/S<0.6 is satisfied where H10 is a hardness at 10 mm point from a center of the spherical core. 
     
     
         3 . The golf ball according to  claim 1 , wherein the hardness difference S<20. 
     
     
         4 . The golf ball according to  claim 1 , wherein Vi≥380. 
     
     
         5 . The golf ball according to  claim 1 , wherein Vi≥400. 
     
     
         6 . The golf ball according to  claim 1 , 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. 
     
     
         7 . The golf ball according to  claim 1 , wherein the outermost cover contains a polyurethane as a resin component. 
     
     
         8 . The golf ball according to  claim 1 , wherein the surface hardness Hs of the spherical core ranges from 60 to 95 in Shore C hardness. 
     
     
         9 . The golf ball according to  claim 1 , wherein the center hardness Ho of the spherical core ranges from 45 to 74 in Shore C hardness. 
     
     
         10 . The golf ball according to  claim 1 , wherein the material hardness Hm of the intermediate layer ranges from 50 to 73 in Shore D hardness. 
     
     
         11 . The golf ball according to  claim 1 , wherein a thickness Tm of the intermediate layer ranges from 0.8 mm to 3.0 mm. 
     
     
         12 . The golf ball according to  claim 1 , wherein the material hardness Hc of the outermost cover ranges from 20 to 40 in Shore D hardness. 
     
     
         13 . The golf ball according to  claim 1 , wherein the thickness Tc of the outermost cover ranges from 0.4 mm to 1.0 mm. 
     
     
         14 . The golf ball according to  claim 2 , wherein the hardness H10 at 10 mm point from the center of the spherical core ranges from 60 to 84 in Shore C hardness. 
     
     
         15 . The golf ball according to  claim 1 , wherein the value (Hc/Tc) ranges from 30 to 75. 
     
     
         16 . The golf ball according to  claim 1 , wherein the value (Hm/Vi) ranges from 0.08 to 0.22.