Clear paint for golf balls and golf ball

Abstract

A clear paint for golf balls containing a modified silicone oil, having two or more hydroxyl groups at one terminal end, or a graft polymer. A golf ball of which surface is coated with the clear paint for golf balls.

What is claimed is:  
     
         1 . A clear paint for golf balls consisting of a base polymer and modified silicone oil, said modified silicone oil having two or more hydroxyl groups at one terminal end.  
     
     
         2 . A clear paint for golf balls as claimed in  claim 1 , wherein the backbone chain of the modified silicone oil is polydimethylsiloxane.  
     
     
         3 . A clear paint for golf balls as claimed in  claim 1 , wherein said paint contains a polyurethane resin as its base polymer.  
     
     
         4 . A clear paint for golf balls as claimed in  claim 3 , wherein the polyurethane resin is obtained by reacting polyol and isocyanate with said modified silicone oil, and the ratio of the modified silicone oil is in a range from 0.01 to 2 parts by weight relative to 100 parts by weight of polyol.  
     
     
         5 . A clear paint for golf balls as claimed in  claim 1 , wherein the modified silicone oil has a molecular weight from 500 to 50000, viscosity at a room temperature from 1 to 50000 mm 2 /s, and a hydroxyl value from 5 to 150 mg-KOH/g.  
     
     
         6 . A clear paint for golf balls as claimed in  claim 1 , wherein the modified silicone oil has the following general formula (1):  
       
         
           
           
               
               
           
         
       
       wherein R A  is a non-reactive alkyl group, and R B  is a functional group having two or more hydroxyl groups.  
     
     
         7 . A clear paint for golf balls as claimed in  claim 6 , wherein the alkyl group represented by R A  is a methyl group or a butyl group, and R B  has one of the following general formulas (2) and (3):  
       
         
           
           
               
               
           
         
       
       wherein, R 1 , R 2 , R 4  are alkylene groups having 1 to 10 carbon atoms, and R 3  is hydrogen or an alkyl group having 1 to 10 carbon atoms.  
     
     
         8 . A clear paint for golf balls as claimed in  claim 1  further containing a solvent.  
     
     
         9 . A clear paint for golf balls as claimed in  claim 8 , wherein said solvent is at least one of methyl ethyl ketone and methyl isobutyl ketone.  
     
     
         10 . A golf ball having a surface, wherein the surface is coated with the clear paint for golf balls as claimed in  claim 1 .  
     
     
         11 . A clear paint for golf balls consisting of a base polymer and a graft polymer.  
     
     
         12 . A clear paint for golf balls as claimed in  claim 11 , wherein said graft polymer is a comb polymer of which backbone polymer is composed of an acrylic resin and branched polymers are composed of polyorganosiloxane.  
     
     
         13 . A clear paint for golf balls as claimed in  claim 12 , wherein the acrylic resin has at least one hydroxyl group at a terminal end or a branch.  
     
     
         14 . A clear paint for golf balls as claimed in  claim 12 , wherein the backbone chain of the polyorganosiloxane is polydimethylsiloxane.  
     
     
         15 . A clear paint for golf balls as claimed in  claim 11 , containing a polyurethane resin as its base polymer.  
     
     
         16 . A clear paint for golf balls as claimed in  claim 15 , wherein the polyurethane resin is a polyurethane resin which is obtained by reacting polyol and isocyanate with said graft polymer and wherein the ratio of the graft polymer is in a range from 0.01 to 10 parts by weight relative to 100 parts by weight of polyol.  
     
     
         17 . A clear paint for golf balls as claimed in  claim 12 , wherein the comb polymer is obtained by radical copolymerization of a macromonomer represented by the following general formula (5) with an acrylic monomer:  
       
         
           
           
               
               
           
         
       
       wherein R c  represents a non-reactive alkyl group, and R d  represents a functional group having double bonded portion.  
     
     
         18 . A clear paint for golf balls as claimed in  claim 17 , wherein the comb polymer is a silicone graft acrylic resin represented by the following general formula (6):  
       
         
           
           
               
               
           
         
       
       wherein R 1 -R 7  are as follows: 
 R 5 : a methyl group, a n-butyl group  
 R 6 : H, a methyl group  
 R 7 : any other alkyl group or an alkyl group containing a functional group.  
 
     
     
         19 . A clear paint for golf balls as claimed in  claim 11  further containing a solvent.  
     
     
         20 . A clear paint for golf balls as claimed in  claim 19 , wherein said solvent is at least one of methyl ethyl ketone and methyl isobutyl ketone.  
     
     
         21 . A golf ball having a surface, wherein said surface is coated with the clear paint for golf balls as claimed in  claim 11.