Golf ball

Abstract

An object of the present invention is to provide a golf ball having excellent scuff resistance and spin performance, and a satisfactory rebound property. The golf ball has a core 3, an intermediate layer 5 covering the core 3, an inner cover 7 covering the intermediate layer 5, and an outer cover 15 covering the inner cover 7, wherein the outer cover 15 includes a neutralized product containing an ethylene-unsaturated carboxylic acid-alkyl(meth)acrylate ternary copolymer having a weight average molecular weight (Mw) of 80,000 to 500,000 and an ethylene-acrylic acid or ethylene-methacrylic acid copolymer having a weight average molecular weight (Mw) of 2,000 to 30,000, and the inner cover 7 also includes the neutralized product.

1 . A golf ball comprising:
 a core;   an intermediate layer formed so as to cover the core;   an inner cover formed so as to cover the intermediate layer; and   an outer cover formed so as to cover the inner cover,   wherein the outer cover comprises a neutralized product containing an ethylene-unsaturated carboxylic acid-alkyl(meth)acrylate ternary copolymer having a weight average molecular weight (Mw) of 80,000 to 500,000 and an ethylene-acrylic acid or ethylene-methacrylic acid copolymer having a weight average molecular weight (Mw) of 2,000 to 30,000; and   the inner cover comprises the neutralized product.   
     
     
         2 . The golf ball according to  claim 1 , wherein the inner cover has a Shore D hardness of 64 to 70. 
     
     
         3 . The golf ball according to  claim 1 , wherein the inner cover has a thickness of 0.9 to 1.2 mm, and the outer cover has a thickness of 0.9 to 1.2 mm. 
     
     
         4 . The golf ball according to  claim 2 , wherein the inner cover has a thickness of 0.9 to 1.2 mm, and the outer cover has a thickness of 0.9 to 1.2 mm. 
     
     
         5 . The golf ball according to  claim 1 , wherein the core comprises a spherical main part and a plurality of ribs formed on the surface of the spherical main part, and the intermediate layer is inserted into depressions surrounded by the ribs. 
     
     
         6 . The golf ball according to  claim 5 , wherein the ribs have a hardness greater than that of the intermediate layer. 
     
     
         7 . The golf ball according to  claim 1 , wherein a plurality of dimples are formed in the surface of the outer cover, and the dimples have an edge angle of 6.2 to 7.2°.