Golf ball

Abstract

In a golf ball having a coating of one or more layer on a golf ball surface with numerous dimples thereon, at least one coating layer is formed of a two-part curable urethane coating composition which has a polyol component and a polyisocyanate component and contains silica and polyurethane as delusterants, the delusterant content being from 8 to 30 parts by weight per 100 parts by weight of coating solids. This golf ball exhibits a gloss-free appearance and has an excellent spin performance on approach shots.

1 . A golf ball comprising a coating of one or more layer on a golf ball surface having numerous dimples thereon, wherein at least one coating layer is formed of a two-part curable urethane coating composition comprised of a polyol component and a polyisocyanate component and containing silica and polyurethane as delusterants, the delusterant content being from 8 to 30 parts by weight per 100 parts by weight of coating solids. 
     
     
         2 . The golf ball of  claim 1 , wherein the delusterant is a mixture of silica particles and polyurethane particles. 
     
     
         3 . The golf ball of  claim 1 , wherein the silica is included in an amount of from 0.6 to 15 parts by weight per 100 parts by weight of coating solids. 
     
     
         4 . The golf ball of  claim 1 , wherein the polyurethane is included in an amount of from 1 to 25 parts by weight per 100 parts by weight of coating solids. 
     
     
         5 . The golf ball of  claim 1 , wherein the delusterant has an average particle size as determined by the BET method of from 0.1 to 20 μm. 
     
     
         6 . The golf ball of  claim 1 , wherein the polyol component is an acrylic polyol or a polyester polyol. 
     
     
         7 . The golf ball of  claim 1 , wherein the two-part curable urethane coating composition is comprised of a polyol component made up primarily of a hydroxyl group-containing polyester polyol having an alicyclic structure on the molecule, and a non-yellowing polyisocyanate. 
     
     
         8 . The golf ball of  claim 1 , wherein the two-part curable urethane coating composition is comprised of a polyol component made up primarily of an acrylic polyol, and an isocyanate component made up primarily of an elastically modified polyisocyanate. 
     
     
         9 . The golf ball of  claim 1 , wherein the golf ball has a surface energy of from 30 to 40 mN/m. 
     
     
         10 . The golf ball of  claim 1 , wherein the golf ball has a static coefficient of friction that is from 0.26 to 0.40.