Patent ID: 7497790
Filing Date: 2009-03-03
Classification: A63B,C08G

Abstract:
1. A golf ball comprising a core and a cover covering the core, wherein the core is formed from a rubber composition comprising cis-1,4-polybutadiene and the cover, having a thickness of 0.5 to 1.5 mm and a hardness in Shore D of 33 to 52, comprises polyurethane-based thermoplastic elastomer formed by using nonionic cycloaliphatic diisocyanate in the backbone structure of the polyurethane molecule as a base resin selected from the group consisting of 4,4′-dicyclohexylmethane diisocyanate, 1,3-bis (isocyanatomethyl)cyclohexane, isophorone diisocyanate, and trans-1,4cyclohexane diisocyanate; and the core has a deformation amount of 2.5 to 4.5 mm, when applying from an initial load of 98 N to a final load of 1275 N on the core, and the golf ball has a deformation amount of 2.4 to 4.0 mm, when applying from an initial load of 98 N to a final load of 1275 N on the golf ball.