US2001016521A1PendingUtilityA1

Thread wound golf ball

43
Priority: Jan 21, 2000Filed: Jan 19, 2001Published: Aug 23, 2001
Est. expiryJan 21, 2020(expired)· nominal 20-yr term from priority
Inventors:Akira Kato
A63B 37/00622A63B 37/00621A63B 37/0063A63B 37/04A63B 37/0076A63B 37/06A63B 37/0066A63B 37/0031A63B 37/0053A63B 37/0054A63B 37/0003A63B 45/00A63B 37/0064
43
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Claims

Abstract

The present invention provides a solid center thread wound golf ball having long flight distance, while maintaining the characteristics peculiar to the conventional thread wound golf ball, i.e. good shot feel and good controllability. The present invention related to a solid center type thread wound golf ball comprising (a) a solid center composed of an inner center and a center outer layer formed on the inner center, (b) a thread rubber layer formed on the solid center, and (c) a cover covering the thread rubber layer, wherein the inner center has a diameter of 20 to 35 mm, the solid center has a diameter of 30 to 38 mm, and a specific gravity of the center outer layer is larger than that of the inner center by 0.1 to 0.4.

Claims

exact text as granted — not AI-modified
What is claimed is:  
     
         1 . A solid center type thread wound golf ball comprising 
 (a) a solid center composed of an inner center and a center outer layer formed on the inner center,    (b) a thread rubber layer formed on the solid center, and    (c) a cover covering the thread rubber layer, wherein the inner center has a diameter of 20 to 35 mm, the solid center has a diameter of 30 to 38 mm, and a specific gravity of the center outer layer is larger than that of the inner center by 0.1 to 0.4.    
     
     
         2 . The solid center type thread wound golf ball according to    claim 1   , wherein the inner center has a center hardness in JIS-C hardness of 30 to 70, and the center outer layer has a surface hardness in JIS-C hardness of 70 to 90.  
     
     
         3 . The solid center type thread wound golf ball according to    claim 1   , wherein the cover has a Shore D hardness of 40 to 65.  
     
     
         4 . The solid center type thread wound golf ball according to    claim 1   , wherein the solid center is formed from a rubber composition comprising polybutadiene containing not less than 40% of a cis-1, 4 bond, a metal salt of α, β-unsaturated carboxylic acid and an organic peroxide.  
     
     
         5 . The solid center type thread wound golf ball according to    claim 1   , wherein the thread rubber layer has a thickness of 1.0 to 5.0 mm.  
     
     
         6 . The solid center type thread wound golf ball according to    claim 1   , wherein the cover has a thickness of 1.0 to 3.5 mm.

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