Patent ID: 7527566

Claim:
A golf ball comprising a core, an outermost cover layer and one or more intermediate layer therebetween, wherein at least one intermediate layer includes a mixture comprising: 100 parts by weight of a base polymer composed of (a) a metal ion neutralization product of an olefin-unsaturated carboxylic acid random copolymer and/or a metal ion neutralization product of an olefin-unsaturated carboxylic acid-unsaturated carboxylic acid ester random copolymer, (b) a thermoplastic elastomer selected from the group consisting of thermoplastic polyester elastomers, thermoplastic block copolymers and thermoplastic polyurethanes, and (c) a thermoplastic block copolymer containing end blocks modified by a functional group having reactivity with an ionomer resin, both end blocks being formed of different comonomers in a weight ratio a/b/c=50 to 80/50 to 20/4 to 20, (e) 5 to 20 parts by weight of an organic acid of 18 to 40 carbons or a derivative thereof, and (f) 0.1 to 10 parts by weight of a metal ion source selected from the group consisting of alkali metals, alkaline earth metals and transition metals; which mixture satisfies the condition 0.4≦(b)/(a)≦1.5, where (b)/(a) is the ratio of the melt viscosity of component (b) to the melt viscosity of component (a) as measured at a shear rate of 6,000 sec-1 and 240° C. in accordance with JIS K 7199.