Heavy filler in golf ball cores

Abstract

Two and three piece golf balls having improved rebound characteristics include cores and centers, respectively, that are comprised of polybutadiene rubber and inorganic fillers with specific gravities of about 5.4 or greater. The inorganic fillers may be selected from tungsten, bismuth, copper, bismuth oxide, nickel, cobalt, iron, steel, tin, chromium, zinc, bismuth subcarbonate, cupric oxide, barium tungstate, cuprous oxide or ferrous oxide.

1 . A golf ball comprising: 
 a core comprising polybutadiene rubber and an inorganic filler having a specific gravity equal to or greater than about 5.6; and,    a cover.    
     
     
         2 . The golf ball of  claim 1  wherein the inorganic filler is selected from the group consisting of tungsten, bismuth, copper, bismuth oxide, nickel, cobalt, iron, steel, tin, chromium, zinc, bismuth subcarbonate, cupric oxide, barium tungstate, cuprous oxide, ferrous oxide and mixtures thereof.  
     
     
         3 . A golf ball comprising: 
 a center comprising polybutadiene rubber and an inorganic filler having a specific gravity equal to or greater than about 5.4;    a thread winding layer wherein the thread winding comprises polybutadiene rubber; and,    a cover.    
     
     
         4 . A golf ball according to  claim 3  wherein the inorganic filler is selected from the group consisting of tungsten, bismuth, copper, bismuth oxide, nickel, cobalt, iron, steel, tin, chromium, zinc, bismuth subcarbonate, cupric oxide, barium tungstate, cuprous oxide, ferrous oxide and mixtures thereof.