Golf ball

Abstract

The invention provides a golf ball having a core and a cover of one or more layer, wherein at least one layer of the cover is made of a material obtained by molding a mixture of (a) a metal ion neutralization product of an olefin-unsaturated carboxylic acid random copolymer having a Shore D hardness of at least 60; (b) an unsaturated fatty acid; and (c) a basic inorganic metal compound capable of neutralizing acid groups in components (a) and (b). The golf ball has both a good feel on impact and excellent scuff resistance while retaining a good flight performance.

1 . A golf ball comprising a core and a cover of one or more layer, wherein at least one layer of the cover is made of a material obtained by molding a mixture comprising:
 (a) 100 parts by weight of a binary polymer which is a metal ion neutralization product of an olefin-unsaturated carboxylic acid random copolymer having a Shore D hardness of at least 60;   (b) 5 to 60 parts by weight of an unsaturated fatty acid;   (c) 1 to 10 parts by weight of a basic inorganic metal compound capable of neutralizing acid groups in components (a) and (b); and   wherein said material does not comprise a ternary polymer.   
   
   
       2 . The golf ball of  claim 1 , wherein an outermost layer of the cover is made of the material obtained by molding the mixture comprising components (a) to (c). 
   
   
       3 . The golf ball of  claim 1 , wherein the mixture has a melt mass flow rate of at least 3.8 to 6.9 g/10 min. 
   
   
       4 . The golf ball of  claim 1 , wherein the unsaturated fatty acid (b) is elaidic acid and/or erucic acid. 
   
   
       5 . The golf ball of  claim 1 , wherein the basic inorganic metal compound (c) is calcium hydroxide. 
   
   
       6 . The golf ball of  claim 1 , wherein the cover has a Shore D hardness of from 46 to 58. 
   
   
       7 . The golf ball of  claim 1 , wherein the metal ion neutralization product of an olefin-unsaturated carboxylic acid randon copolymer serving as component (a) has a Shore D hardness of at least 62.