US2008161132A1PendingUtilityA1

Multi-layer golf ball

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Assignee: ACUSHNET COPriority: Nov 28, 2001Filed: Mar 13, 2008Published: Jul 3, 2008
Est. expiryNov 28, 2021(expired)· nominal 20-yr term from priority
Inventors:Michael J. SullivanDerek A. LaddWilliam E. MorganHerbert C. Boehm
A63B 37/0059A63B 37/0031A63B 37/0087A63B 37/0064A63B 37/0039A63B 37/0043A63B 37/008A63B 37/0066A63B 37/0003A63B 37/0078A63B 37/0063C08K 5/20A63B 37/0076A63B 37/0027A63B 37/0045A63B 37/00622A63B 37/00621A63B 37/00922
57
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Claims

Abstract

Golf balls consisting of a dual core and a dual cover are disclosed. The surface hardness of the outer core layer is greater than the material hardness of the inner cover layer, and is preferably 75 Shore C or greater.

Claims

exact text as granted — not AI-modified
1 . A golf ball consisting of:
 a center formed from a first rubber composition and having a diameter of from 1.20 inches to 1.30 inches and a center hardness of 50 Shore C or greater;   an outer core layer formed from a second rubber composition and having a surface hardness of 75 Shore C or greater;   an inner cover layer formed from a thermoplastic composition and having a material hardness less than the surface hardness of the outer core layer; and   an outer cover layer formed from a polyurethane or polyurea composition.   
   
   
       2 . The golf ball of  claim 1 , wherein the surface hardness of the outer core layer is at least 20 Shore C units greater than the center hardness. 
   
   
       3 . The golf ball of  claim 1 , wherein the outer cover layer has a material hardness less than the surface hardness of the outer core layer. 
   
   
       4 . The golf ball of  claim 1 , wherein the center hardness is from 55 Shore C to 70 Shore C. 
   
   
       5 . The golf ball of  claim 1 , wherein the center has a surface hardness of 65 Shore C or greater. 
   
   
       6 . The golf ball of  claim 1 , wherein the center has a surface hardness of 70 Shore C or greater. 
   
   
       7 . The golf ball of  claim 1 , wherein the surface hardness of the outer core layer is at least 30 Shore C units greater than the center hardness. 
   
   
       8 . The golf ball of  claim 1 , wherein the inner cover layer has a material hardness of from 80 Shore C to 95 Shore C. 
   
   
       9 . The golf ball of  claim 1 , wherein the inner cover layer has a material hardness of from 84 Shore C to 92 Shore C. 
   
   
       10 . The golf ball of  claim 1 , wherein the center has a center hardness of from 50 Shore C to 80 Shore C, the center has a surface hardness of 70 Shore C or greater, the outer core layer has a surface hardness of greater than 80 Shore C, and the surface hardness of the outer core layer is at least 30 Shore C units greater than the center hardness. 
   
   
       11 . The golf ball of  claim 10 , wherein the surface hardness of the outer core layer is 85 Shore C or greater, and the inner cover layer has a material hardness of 90 Shore C or less. 
   
   
       12 . The golf ball of  claim 10 , wherein the surface hardness of the outer core layer is 87 Shore C or greater, and the inner cover layer has a material hardness of 90 Shore C or less. 
   
   
       13 . The golf ball of  claim 12 , wherein the inner cover layer has a material hardness of from 85 Shore C to 90 Shore C. 
   
   
       14 . The golf ball of  claim 10 , wherein the surface hardness of the outer core layer is 90 Shore C or greater, and the inner cover layer has a material hardness of 90 Shore C or less. 
   
   
       15 . The golf ball of  claim 1 , wherein the center has a compression of 40 or less. 
   
   
       16 . The golf ball of  claim 15 , wherein the core has an overall dual core compression of from 75 to 90. 
   
   
       17 . The golf ball of  claim 1 , wherein the core has an overall dual core diameter of from 1.52 inches to 1.59 inches. 
   
   
       18 . A golf ball consisting of:
 a center formed from a first rubber composition and having a diameter of from 1.20 inches to 1.30 inches, a center hardness of from 50 Shore C to 70 Shore C, and a surface hardness of from 60 Shore C to 85 Shore C;   an outer core layer formed from a second rubber composition and having a surface hardness of from 80 Shore C to 95 Shore C;   an inner cover layer formed from a thermoplastic composition and having a material hardness of less than 95 Shore C; and   an outer cover layer formed from a thermosetting polyurethane or polyurea composition;   wherein the surface hardness of the center is at least 10 Shore C units greater than the center hardness;   wherein the surface hardness of the outer core layer is at least 20 Shore C units greater than the center hardness; and   wherein the surface hardness of the outer core layer is greater than the material hardness of the inner cover layer.   
   
   
       19 . The golf ball of  claim 18 , wherein the surface hardness of the outer core layer is greater than the material hardness of the outer cover layer. 
   
   
       20 . The golf ball of  claim 18 , wherein the material hardness of the inner cover layer is from 80 Shore C to 95 Shore C. 
   
   
       21 . The golf ball of  claim 18 , wherein the material hardness of the inner cover layer is from 84 Shore C to 92 Shore C.

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