Patent ID: 8877875
Filing Date: 2014-11-04
Classification: A63B,C08G,C08L

Abstract:
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 the cover is formed from a cover composition containing, as a resin component, a thermoplastic polyurethane (A) and a polyisocyanate mixture (B) in which a urethane prepolymer (b-1) having at least two isocyanate groups or a polyisocyanate (b-2) having at least three isocyanate groups is dispersed in a thermoplastic resin (b-3) which does not substantially react with an isocyanate group; and wherein a number average molecular weight of a polyol component constituting the urethane prepolymer (b-1) is 650 or more, the polyisocyanate (b-2) is an isocyanurate of a diisocyanate, the intermediate layer has a slab hardness of 61 or more in Shore D hardness, the cover composition has a slab hardness of less than 30 in Shore D hardness, the cover has a thickness of from 0.1 mm to 0.8 mm, and the core has a hardness difference (Hs−Ho) between a surface hardness Hs and a center hardness Ho of from 15 to 50 in Shore D hardness, wherein the polyisocyanate mixture (B) has an NCO content (NCO %) of 0.1 mass % to 10.0 mass % in the case that the polyisocyanate mixture (B) contains the urethane prepolymer (b-1), and wherein the polyisocyanate mixture (B) has an NCO content (NCO %) of 5.0 mass % to 30.0 mass % in the case that the polyisocyanate mixture (B) contains the polyisocyanate (b-2).