US2017100643A1PendingUtilityA1

Medium gradient multi-piece urethane covered golf ball

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Assignee: ACUSHNET COPriority: Jul 3, 2007Filed: Dec 20, 2016Published: Apr 13, 2017
Est. expiryJul 3, 2027(~0.9 yrs left)· nominal 20-yr term from priority
Inventors:Michael J. SullivanBrian ComeauDouglas E. JonesDerek A. LaddMark L. Binette
A63B 37/0092A63B 37/0043A63B 37/0022A63B 37/0027A63B 37/0075A63B 37/0062A63B 37/0031A63B 37/00621A63B 37/00222A63B 37/00622A63B 37/008A63B 37/0063A63B 37/0064A63B 37/0039A63B 37/0051A63B 37/0003A63B 37/0032
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Claims

Abstract

A golf ball includes a core having an outer surface and a geometric center; an inner cover layer, and an outer cover layer. The inner cover layer includes an ionomeric material and has a material hardness of about 60 Shore D or greater. The outer cover layer is formed from a polyurea or polyurethane and has a material hardness of about 60 Shore M or greater. The outer surface of the core has a hardness of about 68 to 92 Shore C. The geometric center of the core has a hardness of about 45 to 85 Shore C. The core outer surface hardness is greater than the geometric center hardness by about 5 to 21 Shore C to define a positive hardness gradient.

Claims

exact text as granted — not AI-modified
What is claimed is: 
     
         1 . A golf ball comprising:
 a core having a first outer surface and a geometric center;   an inner cover layer, the inner cover layer comprising an ionomeric material and having a material hardness of about 60 Shore D or greater; and   an outer cover layer, the outer cover layer comprising a polyurea or a polyurethane and having a material hardness of about 60 Shore M or greater;   wherein the first outer surface has a hardness of about 68 Shore C to 92 Shore C, the geometric center has a hardness of about 45 Shore C to 85 Shore C, and the first outer surface hardness is greater than the geometric center hardness by about 5 to 21 Shore C to define a positive hardness gradient.   
     
     
         2 . The golf ball of  claim 1 , wherein the positive hardness gradient is about 11 to 19 Shore C. 
     
     
         3 . The golf ball of  claim 2 , wherein the positive hardness gradient is about 13 to 18 Shore C. 
     
     
         4 . The golf ball of  claim 1 , wherein the core has an outer diameter of about 1.45 to about 1.62 inches and, optionally, comprises an outer core layer disposed between the core and the inner cover layer. 
     
     
         5 . The golf ball of  claim 1 , wherein the hardness of the geometric center is about 60 to 85 Shore C. 
     
     
         6 . The golf ball of  claim 1 , wherein the hardness of the first outer surface is about 74 to 85 Shore C. 
     
     
         7 . The golf ball of  claim 6 , wherein the first surface hardness is about 80 to 84 Shore C. 
     
     
         8 . The golf ball of  claim 1 , wherein the first outer surface has a trans content of about 12% or less and the geometric center has a trans content of about 10% or less. 
     
     
         9 . The golf ball of  claim 1 , wherein the outer cover layer comprises a coating layer having a Shore M hardness of about 60 or less. 
     
     
         10 . The golf ball of  claim 9 , wherein the coating layer has a Shore M hardness of about 50 or less. 
     
     
         11 . The golf ball of  claim 9 , wherein the coating layer has an instrumented hardness of about 0.1 MPa to about 23 MPa. 
     
     
         12 . A golf ball comprising:
 a core having a first outer surface and a geometric center;   an inner cover layer, the inner cover layer comprising an ionomeric material and having a material hardness of about 60 Shore D or greater; and   an outer cover layer, the outer cover layer comprising a polyurea or a polyurethane and having a material hardness of about 60 Shore M or greater;   wherein the first outer surface has a hardness of about 45 Shore D to 56 Shore D, the geometric center has a hardness of about 35 Shore D to 45 Shore D, and the first outer surface hardness is greater than the geometric center hardness by about 3 to 15 Shore D to define a positive hardness gradient.   
     
     
         13 . The golf ball of  claim 12 , wherein the geometric center has a hardness of about 38 to 43 Shore D. 
     
     
         14 . The golf ball of  claim 12 , wherein the first outer surface hardness is about 48 to 54 Shore D. 
     
     
         15 . The golf ball of  claim 12 , wherein the positive hardness gradient is about 5 to 13 Shore D. 
     
     
         16 . The golf ball of  claim 15 , wherein the positive hardness gradient is about 7 to 11 Shore D. 
     
     
         17 . The golf ball of  claim 12 , wherein the first outer surface has a trans content of about 12% or less and the geometric center has a trans content of about 10% or less. 
     
     
         18 . The golf ball of  claim 12 , wherein the outer cover layer comprises a coating layer having a Shore M hardness of about 60 or less. 
     
     
         19 . The golf ball of  claim 18 , wherein the coating layer has a Shore M hardness of about 50 or less. 
     
     
         20 . The golf ball of  claim 18 , wherein the coating layer has an instrumented hardness of about 0.1 MPa to about 23 MPa.

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