Golf ball

Abstract

An object of the present disclosure is to provide a golf ball having a great change in an initial velocity associated with a change in a swing speed. The present disclosure provides a golf ball comprising a constituent member, wherein at least a part of the constituent member is formed of a cured product of a rubber composition comprising (a) a base rubber containing a natural rubber, (b) a co-crosslinking agent containing methacrylic acid and/or a metal salt thereof and (c) a crosslinking initiator.

1 . A golf ball comprising a constituent member, wherein at least a part of the constituent member is formed of a cured product of a rubber composition comprising
 (a) a base rubber containing a natural rubber,   (b) a co-crosslinking agent containing methacrylic acid and/or a metal salt thereof, and   (c) a crosslinking initiator.   
     
     
         2 . The golf ball according to  claim 1 , wherein the rubber composition further contains (d) an organic sulfur compound. 
     
     
         3 . The golf ball according to  claim 2 , wherein the rubber composition contains (d) the organic sulfur compound in an amount ranging from 0.01 part by mass to 20 parts by mass with respect to 100 parts by mass of (a) the base rubber. 
     
     
         4 . The golf ball according to  claim 3 , wherein (d) the organic sulfur compound contains (d1) a compound of thiophenols and/or a metal salt thereof and (d2) a compound of thiazoles and/or a metal salt thereof. 
     
     
         5 . The golf ball according to  claim 4 , wherein a mass ratio (d1/d2) of (d1) the compound of thiophenols and/or the metal salt thereof to (d2) the compound of thiazoles and/or the metal salt thereof ranges from 0.1 to 10.0. 
     
     
         6 . The golf ball according to  claim 1 , wherein the natural rubber has a Mooney viscosity (ML 1+4  (100° C.)) ranging from 30 to 80. 
     
     
         7 . The golf ball according to  claim 1 , wherein (a) the base rubber further contains a synthetic rubber, and an amount of the natural rubber ranges from 10 mass % to 80 mass % in 100 mass % of (a) the base rubber. 
     
     
         8 . The golf ball according to  claim 7 , wherein the synthetic rubber is a high-cis polybutadiene rubber. 
     
     
         9 . The golf ball according to  claim 1 , wherein (b) the co-crosslinking agent consists of methacrylic acid and/or the metal salt thereof. 
     
     
         10 . The golf ball according to  claim 1 , wherein the golf ball is a one-piece golf ball, and a golf ball body thereof is formed of the cured product of the rubber composition. 
     
     
         11 . The golf ball according to  claim 10 , wherein the one-piece golf ball has a diameter ranging from 40 mm to 45 mm and a compression deformation amount ranging from 2.0 mm to 6.0 mm when applying a load from an initial load of 98 N to a final load of 1275 N to the one-piece golf ball. 
     
     
         12 . A one-piece golf ball having a golf ball body,
 wherein the golf ball body is formed from a rubber composition comprising   (a) a base rubber containing a natural rubber,   (b) a co-crosslinking agent containing methacrylic acid and/or a metal salt thereof,   (c) a crosslinking initiator, and   (d) an organic sulfur compound.   
     
     
         13 . The one-piece golf ball according to  claim 12 , wherein the rubber composition contains (d) the organic sulfur compound in an amount ranging from 0.01 part by mass to 20 parts by mass with respect to 100 parts by mass of (a) the base rubber. 
     
     
         14 . The one-piece golf ball according to  claim 13 , wherein (d) the organic sulfur compound contains (d1) a compound of thiophenols and/or a metal salt thereof and (d2) a compound of thiazoles and/or a metal salt thereof. 
     
     
         15 . The one-piece golf ball according to  claim 14 , wherein a mass ratio (d1/d2) of (d1) the compound of thiophenols and/or the metal salt thereof to (d2) the compound of thiazoles and/or the metal salt thereof ranges from 0.1 to 10.0. 
     
     
         16 . The one-piece golf ball according to  claim 15 , wherein the natural rubber has a Mooney viscosity (ML 1+4  (100° C.)) ranging from 30 to 80. 
     
     
         17 . The golf ball according to  claim 16 , wherein (a) the base rubber further contains a synthetic rubber, and an amount of the natural rubber ranges from 10 mass % to 80 mass % in 100 mass % of (a) the base rubber.