Golf ball

Abstract

The present invention provides a golf ball comprising a core, an outermost cover layer and an intermediate layer therebetween. The intermediate layer is formed primarily of a resin material obtained by blending together (I) a sodium ion neutralization product of an olefin-unsaturated carboxylic acid random copolymer with (II) a magnesium ion neutralization product of an olefin-unsaturated carboxylic acid random copolymer. The intermediate layer-forming resin material has a Shore D hardness of from 55 to 70, and the intermediate layer has a thickness of from 0.5 to 2.5 mm. The outermost cover layer is formed primarily of a non-ionomeric resin material. The cover-forming resin material has a Shore D hardness of from 35 to 60, and the cover has a thickness of from 0.5 to 2.0 mm. The golf ball of the invention has a flight performance and controllability acceptable for use by professional golfers and skilled amateurs, and also has an excellent durability to cracking on repeated impact.

1 . A golf ball comprising a core, an outermost cover layer and an intermediate layer therebetween, wherein the intermediate layer is formed primarily of a resin material obtained by blending together (I) a sodium ion neutralization product of an olefin-unsaturated carboxylic acid random copolymer with (II) a magnesium ion neutralization product of an olefin-unsaturated carboxylic acid random copolymer, the intermediate layer-forming resin material having a Shore D hardness of from 55 to 70 and the intermediate layer having a thickness of from 0.5 to 2.5 mm; and the outermost cover layer is formed primarily of a non-ionomeric resin material, the cover-forming resin material having a Shore D hardness of from 35 to 60 and the cover having a thickness of from 0.5 to 2.0 mm. 
   
   
       2 . The golf ball of  claim 1 , wherein the intermediate layer-forming material contains material (I) and material (II) in a mixing ratio by weight of from 20/80 to 80/20. 
   
   
       3 . The golf ball of  claim 1 , wherein the non-ionomeric resin material in the outermost cover layer is a thermoplastic polyurethane elastomer.