Patent ID: 7201674
Filing Date: 2007-04-10
Classification: A63B

Abstract:
1. A golf ball comprising a core, a mid layer and a cover, wherein said mid layer comprises 20% by weight or greater and 60% by weight or less of a styrene block-containing thermoplastic elastomer having a material hardness of less than 10, and 40% by weight or greater and 80% by weight or less of an ethylene-(meth)acrylic acid copolymer-based ionomer resin having a material hardness of 50 or greater and 70 or less, said mid layer has a hardness of 35 or greater and 50 or less, and a thickness of equal to or less than 1.2 mm, said cover has a hardness of equal to or greater than 55, and a thickness of equal to or less than 1.5 mm, said golf ball has numerous double radius dimples and numerous triple radius dimples on the surface thereof, said double radius dimple comprises a first side wall face having a curvature radius R said triple radius dimple comprises a first side wall face having a curvature radius R a proportion of the number of the double radius dimples in total number of the dimples is 20% or greater and 42% or less, and a proportion of the number of the triple radius dimples in total number of the dimples is equal to or greater than 50%.