Patent ID: 7914397

Claim:
A golf ball which comprises a spherical core, a mid layer positioned outside of the core, a cover positioned outside of the mid layer, and a reinforcing layer provided between said mid layer and said cover, wherein said cover has a thickness Tc of equal to or less than 0.5 mm, said cover having a hardness Hc as measured with a Shore D type hardness scale of equal to or less than 47, said cover having a volume V of equal to or less than 2.4 cm 3 , a product obtained by multiplying the thickness Tc (mm), the hardness Hc and the volume V (cm 3 ) of said cover being equal to or less than 90, and a product obtained by multiplying the hardness (Hc) and the volume V (cm 3 ) of said cover being equal to or less than 115, a principal component of the base polymer of said cover is a thermoplastic polyurethane elastomer, and wherein a principal component of the base polymer of said mid layer is an ionomer resin, wherein an isocyanate component of the thermoplastic polyurethane elastomer is an alicyclic diisocyanate, and a base polymer of said reinforcing layer is a two-component cured urethane resin obtained by a reaction of a base material containing a polyol component and a curing agent containing polyisocyanate or a derivative of the polyisocyanate, wherein the base material of the urethane resin in the reinforcing layer contains urethane polyol having a weight average molecular weight from 4000 to 10000.