Patent ID: 7037963

Claim:
A golf ball comprising a core and two or more layers covering said core, wherein: the first layer is formed mainly from (a) a non-ionomer thermoplastic elastomer and (b) a mixture of (b-1) an isocyanate compound and (b-2) a thermoplastic resin which does not substantially react with isocyanate; and the second layer is formed mainly from a mixture composed of a resin component consisting of (in a ratio of from 100:0 to 50:50 by weight) (c) a base resin of one kind or more selected from (c-1) an olefin-unsaturated carboxylic acid binary random copolymer and a metal-ion neutralized product of an olefin-unsaturated carboxylic acid binary random copolymer and (c-2) an olefin-unsaturated carboxylic acid-unsaturated carboxylic ester ternary random copolymer and a metal-ion neutralized product of an olefin-unsaturated carboxylic acid-unsaturated carboxylic ester ternary random copolymer and (d) a non-ionomer thermoplastic elastomer, (e) a fatty acid and/or a derivative thereof having a carbon number of 18–80, (f) a metal ion source to neutralize unneutralized acid radicals in components (c) and (e) mentioned above, and (g) a compound having a molecular weight no larger than 20,000 and having two or more reactive functional groups, with the first layer being contiguous to the second layer.