USRE42393EExpiredUtility

Two-piece solid golf ball

52
Assignee: BRIDGESTONE SPORTS CO LTDPriority: Mar 15, 2000Filed: Nov 8, 2005Granted: May 24, 2011
Est. expiryMar 15, 2020(expired)· nominal 20-yr term from priority
Inventors:Hideo Watanabe
A63B 37/00622A63B 37/00621A63B 37/00215A63B 37/14A63B 37/02A63B 37/0003A63B 37/0018A63B 37/0074A63B 37/0031
52
PatentIndex Score
0
Cited by
25
References
41
Claims

Abstract

In a two-piece solid golf ball comprising a solid core and a cover, the JIS-C hardness at the core surface minus the JIS-C hardness at the core center is 20–30 units, the cover has a gage of 1.3–2 mm and a Shore D hardness of 40–55, and the JIS-C hardness at the cover surface is not greater than the JIS-C hardness at the core surface. Dimples are formed on the cover surface to satisfy a total number of 360–492 and a percent dimple volume V R of 0.74–0.84%. The golf ball is susceptible to spin and easy to control upon approach shots and short iron shots, travels a long distance upon driver shots, gives a pleasant feel on any shot with driver, iron and putter clubs, and offers improved playability satisfying low-handicap players.

Claims

exact text as granted — not AI-modified
1. A two-piece solid golf ball comprising a solid core and a cover having a surface formed with a plurality of dimples, wherein
 the solid core has JIS-C hardnesses at its center and its surface, the JIS-C hardness at the core surface minus the JIS-C hardness at the core center is from 22 to 30 units,   the cover has a gage of 1.3 to 2 mm and a Shore D hardness of up to 55, and has a JIS-C hardness at its surface, the JIS-C hardness at the cover surface minus the JIS-C hardness at the core surface is 17 to −5 units,   the total number of dimples is 360 to 492, and   the percent dimple volume V R  is from 0.74% to 0.84%, wherein V R  is defined as a proportion (%) of the sum of all dimple volumes, each dimple volume defined below a plane circumscribed by the dimple edge, to the overall volume of a phantom golf ball that is free of dimples.   
     
     
       2. The golf ball of  claim 1  wherein the solid core has a JIS-C hardness of 50–65 at its center and 78 to 92 at its surface, respectively. 
     
     
       3. The golf ball of  claim 1  wherein a dimple percent surface coverage S R  is 68 to 82%, wherein S R  is a proportion (%) of the sum of the areas of dimples to the surface area of a phantom golf ball surface that is free of dimples. 
     
     
       4. The golf ball of  claim 3  wherein the dimple percent surface coverage S R  is 72 to 82%. 
     
     
       5. The golf ball, of  claim 1  wherein the solid core is formed of a rubber composition comprising a base rubber, a crosslinking agent, and a peroxide and the cover is formed of materials including ionomer resins, thermoplastic polyester elastomers, thermoplastic polyamide elastomers, thermoplastic polyurethane elastomers, thermoplastic olefin elastomers, and mixtures thereof. 
     
     
       6. A golf ball constituted two layers comprising a core and a cover, said core being formed of a rubber composition including 100 parts by weight of a rubber component, 0.1 part by weight of sulfur and 1 part by weight of zinc pentachlorothiophenol, wherein a difference determined by subtracting a center hardness of said core from a surface hardness of said core is at least 25 in terms of JIS-C hardness.  
     
     
       7. The golf ball according to claim 6, wherein said core has a center hardness of 50 to 55 in terms of JIS-C hardness.  
     
     
       8. A golf ball constituted of two layers comprising a core and a cover, said core being formed of a rubber composition including 100 parts by weight of a rubber component, 0.1 part by weight of sulfur and 1 part by weight of zinc pentachlorothiophenol, wherein the ratio of the amount of sulfur to the amount of organic sulfur compound is 0.01 to 2.0 wherein a difference determined by subtracting a center hardness of said core from a surface hardness of said core is at least 25 in terms of JIS-C hardness wherein an amount of deformation of said core under a load from an initial load of 98 N to a final load of 1274 N is 2.4 to 3.5 mm.  
     
     
       9. The golf ball according to claim 8, wherein said core has a center hardness of 50 to 55 in terms of JIS-C hardness.  
     
     
       10. A golf ball constituted of two layers, consisting essentially of:
 a core and a cover;   said core being formed of a rubber composition including 100 parts by weight of a rubber component, 0.1 part by weight of sulfur and 1 part by weight of zinc pentachlorothiophenol;   wherein a difference determined by subtracting a center hardness of said core from a surface hardness of said core is at least 25 in terms of JIS-C hardness.    
     
     
       11. The golf ball according to claim 10, wherein a difference determined by subtracting a center hardness of said core from a surface hardness of said core is 25 to 30 in terms of JIS-C hardness.  
     
     
       12. The golf ball according to claim 10, wherein said core has a center hardness of 50 to 55 in terms of JIS-C hardness.  
     
     
       13. The golf ball according to claim 10, wherein said core has a center hardness of 50 to 65 in terms of JIS-C hardness.  
     
     
       14. A golf ball constituted of two layers, consisting essentially of:
 a core and a cover;   said core being formed of a rubber composition including 100 parts by weight of a rubber component, 0.1 part by weight of sulfur and 1 part by weight of zinc pentachlorothiophenol;   wherein a difference determined by subtracting a center hardness of said core from a surface hardness of said core is at least 25 in terms of JIS-C hardness; and   wherein an amount of deformation of said core under a load from an initial load of 98 N to a final load of 1,275 N is 2.4 to 3.5 mm.    
     
     
       15. The golf ball according to claim 14, wherein a difference determined by subtracting a center hardness of said core from a surface hardness of said core is 25 to 30 in terms of JIS-C hardness.  
     
     
       16. The golf ball according to claim 14, wherein said core has a center hardness of 50 to 55 in terms of JIS-C hardness.  
     
     
       17. The golf ball according to claim 14, wherein said core has a center hardness of 50 to 65 in terms of JIS-C hardness.  
     
     
       18. A golf ball constituted of two layers comprising a core and a cover, said core being formed of a rubber composition including a rubber component, sulfur and zinc pentachlorothiophenol, wherein a difference determined by subtracting a center hardness of said core from a surface hardness of said core is at least 25 in terms of JIS-C hardness.  
     
     
       19. A golf ball constituted of two layers comprising a core and a cover, said core being formed of a rubber composition including a rubber component, sulfur and zinc pentachlorothiophenol, wherein a difference determined by subtracting a center hardness of said core from a surface hardness of said core is at least 25 in terms of JIS-C hardness wherein an amount of deformation of said core under a load from an initial load of 98 N to a final load of 1274 N is 2.4 to 3.5 mm.  
     
     
       20. A golf ball comprising a core and a cover, said core being formed of a rubber composition including 100 parts by weight of a rubber component, 0.1 part by weight of sulfur and 1 part by weight of zinc pentachlorothiophenol, wherein a difference determined by subtracting a center hardness of said core from a surface hardness of said core is at least 25 in terms of JIS-C hardness.  
     
     
       21. A golf ball comprising a core and a cover, said core being formed of a rubber composition including 100 parts by weight of a rubber component, 0.1 part by weight of sulfur and 1 part by weight of zinc pentachlorothiophenol organic sulfur, wherein a difference determined by subtracting a center hardness of said core from a surface hardness of said core is at least 25 in terms of JIS-C hardness wherein an amount of deformation of said core under a load from an initial load of 98 N to a final load of 1274 N is 2.4 to 3.5 mm.  
     
     
       22. A golf ball comprising a core and a cover, said core being formed of a rubber composition including a rubber component, sulfur and zinc pentachlorothiophenol wherein a difference determined by subtracting a center hardness of said core from a surface hardness of said core is at least 25 in terms of JIS-C hardness.  
     
     
       23. A golf ball comprising a core and a cover, said core being formed of a rubber composition including a rubber component, sulfur and zinc pentachlorothiophenol wherein a difference determined by subtracting a center hardness of said core from a surface hardness of said core is at least 25 in terms of JIS-C hardness wherein an amount of deformation of said core under a load from an initial load of 98 N to a final load of 1274 N is 2.4 to 3.5 mm.  
     
     
       24. The golf ball according to claim 18, wherein a difference determined by subtracting a center hardness of said core from a surface hardness of said core is 25 to 30 in terms of JIS-C hardness.  
     
     
       25. The golf ball according to claim 18, wherein said core has a center hardness of 50 to 55 in terms of JIS-C hardness.  
     
     
       26. The golf ball according to claim 18, wherein said core has a center hardness of 50 to 65 in terms of JIS-C hardness.  
     
     
       27. The golf ball according to claim 19, wherein a difference determined by subtracting a center hardness of said core from a surface hardness of said core is 25 to 30 in terms of JIS-C hardness.  
     
     
       28. The golf ball according to claim 19, wherein said core has a center hardness of 50 to 55 in terms of JIS-C hardness.  
     
     
       29. The golf ball according to claim 19, wherein said core has a center hardness of 50 to 65 in terms of JIS-C hardness.  
     
     
       30. The golf ball according to claim 20, wherein a difference determined by subtracting a center hardness of said core from a surface hardness of said core is 25 to 30 in terms of JIS-C hardness.  
     
     
       31. The golf ball according to claim 20, wherein said core has a center hardness of 50 to 55 in terms of JIS-C hardness.  
     
     
       32. The golf ball according to claim 20, wherein said core has a center hardness of 50 to 65 in terms of JIS-C hardness.  
     
     
       33. The golf ball according to claim 21, wherein a difference determined by subtracting a center hardness of said core from a surface hardness of said core is 25 to 30 in terms of JIS-C hardness.  
     
     
       34. The golf ball according to claim 21, wherein said core has a center hardness of 50 to 55 in terms of JIS-C hardness.  
     
     
       35. The golf ball according to claim 21, wherein said core has a center hardness of 50 to 65 in terms of JIS-C hardness.  
     
     
       36. The golf ball according to claim 22, wherein a difference determined by subtracting a center hardness of said core from a surface hardness of said core is 25 to 30 in terms of JIS-C hardness.  
     
     
       37. The golf ball according to claim 22, wherein said core has a center hardness of 50 to 55 in terms of JIS-C hardness.  
     
     
       38. The golf ball according to claim 22, wherein said core has a center hardness of 50 to 65 in terms of JIS-C hardness.  
     
     
       39. The golf ball according to claim 23, wherein a difference determined by subtracting a center hardness of said core from a surface hardness of said core is 25 to 30 in terms of JIS-C hardness.  
     
     
       40. The golf ball according to claim 23, wherein said core has a center hardness of 50 to 55 in terms of JIS-C hardness.  
     
     
       41. The golf ball according to claim 23, wherein said core has a center hardness of 50 to 65 in terms of JIS-C hardness.

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