Golf ball

Abstract

A golf ball 2 includes a spherical core 4 , a cover 6 and a paint layer 8 . The core 4 includes a spherical center 10 and a mid layer 12 . The cover 6 is formed from a resin composition that includes a base resin and a fluorescent pigment. The paint layer 8 is formed from a resin composition that includes a base resin and a light-collecting fluorescent dye. A product of an amount of the light-collecting fluorescent dye per 100 parts by weight of the base resin in the paint layer 8 and a thickness (mm) of the paint layer 8 is higher than 5.0×10 −5 and lower than 2.0×10 −3 .

What is claimed is: 
     
         1 . A golf ball comprising a core, a cover covering the core, and a paint layer covering the cover, wherein
 the paint layer is formed from a resin composition that includes a base resin and a light-collecting fluorescent dye, and   a product of an amount of the light-collecting fluorescent dye per 100 parts by weight of the base resin in the paint layer and a thickness (mm) of the paint layer is higher than 4.0×10 −5  and lower than 6.0×10 −3 .   
     
     
         2 . The golf ball according to  claim 1 , wherein the paint layer includes 0.005 parts by weight or greater but 0.20 parts by weight or less of the light-collecting fluorescent dye per 100 parts by weight of the base resin. 
     
     
         3 . The golf ball according to  claim 1 , wherein the paint layer includes a perylene type dye and/or a naphthalimide type dye. 
     
     
         4 . The golf ball according to  claim 1 , wherein the paint layer is transparent. 
     
     
         5 . The golf ball according to  claim 4 , wherein the paint layer includes no white inorganic pigment. 
     
     
         6 . The golf ball according to  claim 1 , wherein the thickness of the paint layer is equal to or greater than 0.008 mm but equal to or less than 0.030 mm. 
     
     
         7 . The golf ball according to  claim 1 , wherein the cover is formed from a resin composition that includes a base resin and a fluorescent pigment. 
     
     
         8 . The golf ball according to  claim 7 , wherein the resin composition of the cover includes 0.01 parts by weight or greater but 5.0 parts by weight or less of the fluorescent pigment per 100 parts by weight of the base resin. 
     
     
         9 . The golf ball according to  claim 7 , wherein the resin composition of the cover includes one or more fluorescent pigments selected from the group consisting of a xanthene type fluorescent pigment, an acridine type fluorescent pigment, a quinoline type fluorescent pigment, a thiazole type fluorescent pigment, and an aminoketone type fluorescent pigment. 
     
     
         10 . The golf ball according to  claim 7 , wherein a type of color of the light-collecting fluorescent dye included in the paint layer is the same as a type of color of the fluorescent pigment included in the cover. 
     
     
         11 . The golf ball according to  claim 7 , wherein the resin composition of the cover includes 0.05 parts by weight or greater but 5.0 parts by weight or less of a white inorganic pigment per 100 parts by weight of the base resin. 
     
     
         12 . The golf ball according to  claim 1 , wherein
 the core is composed of a plurality of layers, and   an outermost layer of the core is formed from a resin composition that includes 100 parts by weight of a base resin and 1.0 parts by weight or greater but 10.0 parts by weight or less of a white inorganic pigment.   
     
     
         13 . The golf ball according to  claim 1 , wherein a color difference ΔE between a surface of the golf ball and a surface of a sphere consisting of the core and the cover is equal to or less than 20.