Patent ID: 8598278
Filing Date: 2013-12-03
Classification: A63B,C08L

Abstract:
1. A golf ball comprising: a core consisting of a center and at least one intermediate layer covering the center, a cover covering the core, wherein at least one piece or one layer of the intermediate layer is formed from a golf ball forming resin composition comprising as a resin component, (A) a high melt viscosity resin containing: (a-1) a high melt viscosity ionomer resin having a melt viscosity (190° C.) ranging from 500 Pa·s to 100,000 Pa·s measured by a flow tester and consisting of a metal ion-neutralized product of a binary copolymer composed of ethylene and α,β-unsaturated carboxylic acid having 3 to 8 carbon atoms, a metal ion-neutralized product of a ternary copolymer composed of ethylene, α,β-unsaturated carboxylic acid having 3 to 8 carbon atoms and α,β-unsaturated carboxylic acid ester, or a mixture thereof, and/or (a-2) a high melt viscosity nonionic resin having a melt viscosity (190° C.) ranging from 5 Pa·s to 3,000 Pa·s measured by a flow tester and consisting of a binary copolymer composed of ethylene and α,β-unsaturated carboxylic acid having 3 to 8 carbon atoms, a ternary copolymer composed of ethylene, α,β-unsaturated carboxylic acid having 3 to 8 carbon atoms and α,β-unsaturated carboxylic acid ester, or a mixture thereof; (B) a low melt viscosity ionomer resin having a melt viscosity (190° C.) ranging from 1 Pa·s to 10 Pa·s measured by a brookfield viscometer, and consisting of a metal ion-neutralized product of a binary copolymer composed of ethylene and α,β-unsaturated carboxylic acid having 3 to 8 carbon atoms, a metal ion-neutralized product of a ternary copolymer composed of ethylene, α,β-unsaturated carboxylic acid having 3 to 8 carbon atoms and α,β-unsaturated carboxylic acid ester, or a mixture thereof, in a ratio of (A) the high melt viscosity resin/(B) the low melt viscosity ionomer resin being 55 mass % to 99 mass %/45 mass % to 1 mass %; and (C) a metal ion source capable of neutralizing carboxyl groups of (A) the high melt viscosity resin and (B) the low melt viscosity ionomer resin, in an amount of from 0.1 part to 10 parts with respect to 100 parts by mass of a sum of (A) the high melt viscosity resin and (B) the low melt viscosity ionomer resin; wherein the golf ball forming resin composition has a melt flow rate (190° C., 2.16 kg) ranging from 10 g/10 min to 100 g/10 min.