An object of the present invention is to provide a golf ball having high resilience. The present invention provides a golf ball having a constituting member, wherein at least a part of the constituting member is formed from a rubber composition containing (a) a base rubber, (b) a co-crosslinking agent, (c) a crosslinking initiator, and (d) an organic sulfur compound, the organic sulfur compound being derivatives of thiophenols and disulfide with a strong electron withdrawing substituent.
1. A golf ball having a constituting member, wherein at least a part of the constituting member is formed from a rubber composition containing (a) a base rubber, (b) a co-crosslinking agent, (c) a crosslinking initiator, and (d) an organic sulfur compound including at least one represented by following formulae (1) to (3);
in formula (1), R 1 to R 5 each independently represent COOR 11 or H, and at least one of R 1 to R 5 is COOR 11 , and COOR 11 is COOX, COOCOX, or COOCOR 12 , wherein X is any one of Br, Cl, or F and R 12 is an alkyl group having a carbon number of 1 to 17 where one or more hydrogens of the alkyl group are optionally substituted;
in formula (2), R 1 to R 10 each independently represent COOR 11 or H, and at least one of R 1 to R 5 and at least one of R 6 to R 10 are COOR 11 , and COOR 11 is COOX, COOCOX, or COOCOR 12 , wherein X is any one of Br, Cl, or F and R 12 is an alkyl group having a carbon number of 1 to 17 where one or more hydrogens of the alkyl group are optionally substituted;
in formula (3), R 1 to R 5 each independently represent COOR 11 or H, and at least one of R 1 to R 5 is COOR 11 , and COOR 11 is COOX, COOCOX, or COOCOR 12 , wherein X is any one of Br, Cl, or F and R 12 is an alkyl group having a carbon number of 1 to 17 where one or more hydrogens of the alkyl group are optionally substituted; n is a natural number equal to or larger than 1, and M represents a metal atom having a valence equal to or larger than 1.
2. The golf ball according to claim 1 , wherein two to four of R 1 to R 5 are COOR 11 in the formulae (1) and (3).
3. The golf ball according to claim 1 , wherein two to four of R 1 to R 5 and two to four of R 6 to R 10 are COOR 11 in the formula (2).
4. The golf ball according to claim 1 , wherein COOR 11 is attached at ortho position or para position to a sulfur bond.
5. The golf ball according to claim 1 , wherein COOR 11 is COOCOCl.
6. The golf ball according to claim 1 , wherein the golf ball is a two-piece golf ball comprising a core and a cover covering the core, wherein the core is formed from the rubber composition.
7. The golf ball according to claim 1 , wherein the golf ball is a multi-piece golf ball comprising a core having a center and at least one intermediate layer covering the center, and a cover covering the core, wherein at least a part of the center and/or the intermediate layer is formed from the rubber composition.
8. The golf ball according to claim 1 , wherein the golf ball is a one-piece golf ball comprising a golf ball body, wherein the golf ball body is formed from the rubber composition.
9. The golf ball according to claim 1 , wherein the organic sulfur compound represented by the formula (1) includes at least one member selected from the group consisting of 2,4,6-tris(chloroformylcarboxy)thiophenol, 2,6-bis(chloroformylcarboxy)thiophenol, 2,3,4-tris(chloroformylcarboxy)thiophenol, pentakis(chloroformylcarboxy)thiophenol, 2,4,6-tris(acetoxycarbonyl)thiophenol, 2,6-bis(acetoxycarbonyl)thiophenol, 2,3,4-tris(acetoxycarbonyl)thiophenol, pentakis(acetoxycarbonyl)thiophenol, and 2,4,6-tris(trichloromethylformylcarboxy)thiophenol.
10. The golf ball according to claim 1 , wherein the organic sulfur compound represented by the formula (2) includes at least one member selected from the group consisting of bis(2,4,6-tris(chloroformylcarboxy)phenyl)disulfide, bis(2,6-bis(chloroformylcarboxy)phenyl)disulfide, bis(2,3,4-tris(chloroformylcarboxy)phenyl)disulfide, bis(pentakis(chloroformylcarboxy)phenyl)disulfide, bis(2,4,6-tris(acetoxycarbonyl)phenyl)disulfide, bis(2,6-bis(acetoxycarbonyl)phenyl)disulfide, bis(2,3,4-tris(acetoxycarbonyl)phenyl)disulfide, bis(pentakis(acetoxycarbonyl)phenyl)disulfide, and bis(2,4,6-tris(trichloromethylformylcarboxy)phenyl)disulfide.
11. The golf ball according to claim 1 , wherein the organic sulfur compound represented by the formula (3) includes a metal salt of at least one member selected from the group consisting of 2,4,6-tris(chloroformylcarboxy)thiophenol, 2,6-bis(chloroformylcarboxy)thiophenol, 2,3,4-tris(chloroformylcarboxy)thiophenol, pentakis(chloroformylcarboxy)thiophenol, 2,4,6-tris(acetoxycarbonyl)thiophenol, 2,6-bis(acetoxycarbonyl)thiophenol, 2,3,4-tris(acetoxycarbonyl)thiophenol, pentakis(acetoxycarbonyl)thiophenol, and 2,4,6-tris(trichloromethylformylcarboxy)thiophenol.
12. A golf ball having a constituting member, wherein at least one part of the constituting member is formed from a rubber composition containing (a) a base rubber, (b) a co-crosslinking agent, (c) a crosslinking initiator, and (d) an organic sulfur compound including at least one represented by following formulae (4) to (6);
in formulae (4) to (6), COOR 11 is COOX, COOCOX, or COOCOR 12 , wherein X is any one of Br, Cl, or F and R 12 is an alkyl group having a carbon number of 1 to 17 where one or more hydrogens of the alkyl group are optionally substituted; in formula (6), n is a natural number equal to or larger than 1, and M represents a metal atom having a valence equal to or larger than 1.
13. The golf ball according to claim 12 , wherein COOR 11 is COOCOCl.