Golf ball

Abstract

A golf ball which improves adherence of a coating to a cover and which improves spin retention without sacrificing the other properties of the coating. The golf ball has a core, a cover of at least one layer covering the core and a coating formed on an outer surface of the cover, wherein a thickness of the coating is 25 to 125 μm, a 50%-modulus of the coating is 5 to 50 MPa, and a value R expressed by R=PL/CL/1000 is 0.01 to 0.5, where CL (mm) represents a thickness of an outermost layer of the cover and PL (μm) represents a thickness of the coating.

What is claimed is:  
     
         1 . A golf ball having a core, a cover of at least one layer covering the core and a coating formed on an outer surface of the cover, wherein 
 a thickness of said coating is 25 to 125 μm, a 50%-modulus of the coating is 5 to 50 MPa, and a value R expressed by an equation (1) is 0.01 to 0.5:      R=PL/CL/ 1000   (1)    where CL (mm) represents a thickness of an outermost layer of the cover and PL (μm) represents a thickness of said coating.    
     
     
         2 . The golf ball according to  claim 1 , wherein 
 the outermost layer of the cover has thickness CL (mm) of 0.5 to 2.5.    
     
     
         3 . The golf ball according to  claim 1 , wherein 
 the coating is formed with polyurethane paint including polyol and polyisocyanate.    
     
     
         4 . The golf ball according to  claim 3 , wherein 
 an equivalent ratio of trifunctional polyol to bifunctional polyol included in polyol (trifunctional polyolibifunctional polyol) is 1.0-2.5.