Golf ball with cover made from fast curing polyurethane

Abstract

A golf ball includes a wound center and a cover made from fast curing polyurethane. The fast curing polyurethane is a two-component polyurethane which includes an isocyanate and a mixture of isocyanate reactive compounds comprising polyether or polyester polyol, aliphatic or aromatic (di) amines, and chain extenders, catalysts, internal mold release agent as needed.

We claim:  
     
         1 . A golf ball comprising: 
 a center,    a layer of elastic windings surrounding the center,    a cover having a Shore D hardness of 50 to 65 and formed from a fast curing two component polyurethane system which includes: 
 1. An isocyanate, and  
 2. One or more isocyanate reactive components selected from the class consisting of: 
 a. polyether polyols,  
 b. polyester polyols,  
 c. aliphatic (di)amines, and  
 d. aromatic (di)amines.  
 
   
     
     
         2 . The golf ball of  claim 1  in which said polyurethane system is a thermoset polyurethane.  
     
     
         3 . The golf ball of  claim 1  in which said isocyanate is diphenylmethane 4,4-diisocyanate.  
     
     
         4 . The golf ball of  claim 1  in which said isocyanate is isophorone diisocyanate.  
     
     
         5 . The golf ball of  claim 1  in which said polyurethane system includes an aromatic isocyanate, a polyol, an aliphatic amine, an aromatic diamine, and a catalyst.  
     
     
         6 . A golf ball comprising: 
 a center having a diameter of 1 to 1.4 inch,    a layer of elastic windings surrounding the center and having an outer diameter of 1.52 to 1.60 inch, and    a cover having a Shore D hardness of 50 to 65 and formed from a fast curing two component polyurethane system comprising: 
 1. An aromatic isocyanate prepolymer,  
 2. an isocyanate reactive compound comprising a polyol, an aliphatic amine, an aromatic diamine, and a catalyst.  
   
     
     
         7 . The golf ball of  claim 6  in which said aromatic isocyanate prepolymer is diphenylmethane diisocyanate prepolymer.  
     
     
         8 . The golf ball of  claim 7  in which said polyol is propylene glycol.  
     
     
         9 . The golf ball of  claim 8  in which said aromatic diamine is diethyltoluene diamine.  
     
     
         10 . The golf ball of  claim 6  in which said polyol is propylene glycol.  
     
     
         11 . The golf ball of  claim 6  in which said aromatic diamine is diethyltoluene diamine.