Golf ball

摘要

The present invention provides a golf ball having a center and at least one intermediate layer covering the center and a cover, wherein at least one of the intermediate layer is formed from a composition comprising, as a resin component, (A) a polyamide copolymer containing (a-1) a polymerized fatty acid, (a-2) sebacic acid and/or azelaic acid, (a-3) a polyamine component as an essential component, and (B) at least one member selected from (b-1) a binary copolymer composed of an olefin and an α,β-unsaturated carboxylic acid, (b-2) a metal ion-neutralized product of a binary copolymer composed of an olefin and an α,β-unsaturated carboxylic acid, (b-3) a ternary copolymer composed of an olefin, an α,β-unsaturated carboxylic acid and an α,β-unsaturated carboxylic acid ester, and (b-4) a metal ion-neutralized product of a ternary copolymer composed of an olefin, an α,β-unsaturated carboxylic acid and an α,β-unsaturated carboxylic acid ester.

主权项

1. A golf ball comprising a core consisting of a center and at least one intermediate layer covering the center and a cover covering the core, wherein at least one intermediate layer is formed from an intermediate layer composition comprising, as a resin component,
(A) a polyamide copolymer containing (a-1) a polymerized fatty acid, (a-2) sebacic acid and/or azelaic acid, and (a-3) a polyamine component, and (B) (b-2) a metal ion-neutralized product of a binary copolymer composed of an olefin and an α,β-unsaturated carboxylic acid having 3 to 8 carbon atoms, and (b-4) a metal ion-neutralized product of a ternary copolymer composed of an olefin, an α,β-unsaturated carboxylic acid having 3 to 8 carbon atoms and an α,β-unsaturated carboxylic acid ester, wherein (b-2) the metal ion-neutralized product of the binary copolymer composed of the olefin and the α,β-unsaturated carboxylic acid having 3 to 8 carbon atoms is a mixture of a binary ionomer resin neutralized with a sodium ion and a binary ionomer resin neutralized with a zinc ion, and the intermediate layer composition has a melt flow rate (240° C., 2.16 kg) of 35 g/10 min or more.