Patent ID: 8419570
Filing Date: 2013-04-16
Classification: A63B

Abstract:
1. A golf ball which comprises a spherical core, a mid layer positioned outside of the core, a reinforcing layer positioned outside of the mid layer, a cover positioned outside of the reinforcing layer and a paint layer positioned outside of the cover, wherein a principal component of the base polymer of said mid layer being an ionomer resin, said mid layer having a hardness as measured with a Shore D type hardness scale of equal to or greater than 55, a base polymer of said reinforcing layer is a thermosetting resin, wherein the thermosetting resin is a two component cured epoxy resin obtained by curing a bisphenol A type epoxy resin with a polyamide amine curing agent or a denatured product of the polyamide amine curing agent, a principal component of the base polymer of said cover being a thermoplastic polyurethane elastomer which includes a polyurethane component, and a polyester component or a polyether component, a curing agent in the polyurethane component being an alicyclic diisocyanate, said cover having a thickness Tc of equal to or greater than 0.1 mm and equal to or less than 0.3 mm, said cover having a hardness as measured with a Shore D type hardness scale of equal to or less than 54, and a ratio (Tr/Tc) of the thickness Tr of said reinforcing layer to the thickness Tc of said cover being 0.005 or greater and 3.0 or less.