Two-piece golf ball

Abstract

A two-piece golf ball includes a solid core and a cover. A difference between the maximum JIS-C hardness and the minimum JIS-C hardness of the solid core is in a range of less than 5. The cover is made from a material mainly containing a base resin composed of a Zn ion neutralized type ionomer resin and an Na ion neutralized type ionomer resin. The shore D hardness of the cover is in a range of less than 62. The thickness of the cover is in a range of 2.1 mm to 2.7 mm. The two-piece golf ball has a very high durability and is suitably used particularly as a training golf ball.

1 . A two-piece golf ball comprising a solid core and a cover; 
 wherein a difference between the maximum JIS-C hardness and the minimum JIS-C hardness of said solid core is in a range of less than 5;    said cover is made from a material mainly containing a base resin composed of a Zn ion neutralized type ionomer resin and an Na ion neutralized type ionomer resin;    the shore D hardness of said cover is in a range of less than 62; and    the thickness of said cover is in a range of 2.1 mm to 2.7 mm.    
     
     
         2 . A two-piece golf ball according to  claim 1 , wherein said cover is made from a material mainly containing said base resin to which an inorganic granular filler is added as a reinforcing material in an amount of 11 parts by mass or more on the basis of 100 parts by mass of said base resin.