Golf ball having improved core rubber composition

Abstract

A golf ball construction is provided having a solid core composition comprising a SBR rubber present between about 5 PHR to about 20 PHR. The resulting core has a core center hardness which is between at least 3 to 12 Shore D units less than an exterior of the core.

That which is claimed is:  
     
         1 . A golf ball core composition comprising: 
 an elastomer having between about 80 to about 95 PHR of a polybutadiene elastomer and about 5 to about 20 PHR of a styrene butadiene elastomer.    
     
     
         2 . The core composition according to  claim 1  wherein the SBR is present in an amount of between about 5 PHR to about 15 PHR.  
     
     
         3 . The core composition according to  claim 1  wherein the golf ball core has a core center having a Shore D hardness value of at least 2 units less than an exterior of the core.  
     
     
         4 . A golf ball comprising: 
 an outer cover; and,    a core, the core comprising at least one SBR elastomer and having a core center Shore D value of between about 33 and about 36 and a core exterior having a Shore D value of between about 39 and about 49.    
     
     
         5 . The golf ball according to  claim 4  wherein the center of the core has a Shore D value which is at least about 10 Shore D unit values less than an exterior of the core.  
     
     
         6 . The golf ball according to  claim 4  wherein said at least one SBR elastomer is present in an amount of about 5 to about 20 PHR of a core composition.  
     
     
         7 . The golf ball according to  claim 4  wherein said at least one SBR elastomer is present in an amount of about 5 to about 10 PHR of a core composition.  
     
     
         8 . A golf ball core composition comprising: 
 an elastomer having between about 90 to about 95 PHR of a polybutadiene elastomer and about 5 to about 10 PHR of a styrene butadiene elastomer.