Solid golf ball

Abstract

The invention provides a solid golf ball which has a core of at least one layer and a cover of at least one layer. At least one layer of the core is formed primarily of polybutadiene and includes at least 0.05 part by weight each of (I) a rubber powder obtained by granulating a rubber material containing methacrylic acid or a metal salt thereof and (II) a polyurethane resin powder per 100 parts by weight of rubber component. At least one layer of the cover is formed primarily of polyurethane.

1 . A solid golf ball comprising a core of at least one layer and a cover of at least one layer, wherein at least one layer of the core is formed primarily of polybutadiene and includes at least 0.05 part by weight each of (I) a rubber powder obtained by granulating a rubber material containing methacrylic acid or a metal salt thereof and (II) a polyurethane resin powder per 100 parts by weight of rubber component, and at least one layer of the cover is formed primarily of polyurethane. 
     
     
         2 . The solid golf ball of  claim 1 , wherein the core layer which includes the polyurethane resin powder (II) adjoins the cover layer composed primarily of polyurethane. 
     
     
         3 . The solid golf ball of  claim 1 , wherein the core includes at least 5 parts by weight of methacrylic acid and/or a metal salt of methacrylic acid as a co-crosslinking agent per 100 parts by weight of rubber component. 
     
     
         4 . The solid golf ball of  claim 1 , wherein the polyurethane resin powder (II) is granulated by a granulator to an average particle size of not more than 1 mm. 
     
     
         5 . The solid golf ball of  claim 1 , wherein the polyurethane resin powder (II) is composed primarily of thermoplastic polyurethane and has a flow starting point of from 150 to 320° C. 
     
     
         6 . The solid golf ball of  claim 1 , wherein the core has a hardness designed so as to gradually increase from a center of the core toward a surface of the core. 
     
     
         7 . The solid golf ball of  claim 1  which has been produced by treating a surface of the core with a solution containing a haloisocyanuric acid and/or a metal salt thereof, then encasing the core in a cover layer.