Polyurethanes, Articles and Coatings Prepared Therefrom and Methods of Making the Same

Abstract

The present invention provides polyurethanes including a reaction product of components including: (a) an isocyanate functional urethane prepolymer comprising a reaction product of components including: (i) about 1 equivalent of at least one polyisocyanate; and (ii) about 0.1 to about 0.5 equivalents of at least one diol having 2 to 18 carbon atoms; and (b) about 0.05 to about 0.9 equivalents of at least one branched polyol having 4 to 18 carbon atoms and at least 3 hydroxyl groups; and (c) up to about 0.9 equivalents of at least one polyol different from branched polyol (b) and having 2 to 18 carbon atoms, wherein the reaction product components are essentially free of polyester polyol and polyether polyol; compositions, coatings and articles made therefrom and methods of making the same.

What is claimed is: 
     
         1 . A polyurethane comprising a reaction product of components comprising:
 (a) an isocyanate functional urethane prepolymer comprising a reaction product of components comprising:
 (i) about 1 equivalent of at least one polyisocyanate; and 
 (ii) about 0.1 to about 0.5 equivalents of at least one polyol having 2 to 18 carbon atoms; and 
   (b) about 0.05 to about 1.0 equivalents of at least one branched polyol having 4 to 18 carbon atoms and at least 3 hydroxyl groups; and   (c) up to about 0.9 equivalents of at least one polyol different from branched polyol (b) and having 2 to 18 carbon atoms,   
       wherein the reaction product components are essentially free of polyester polyol and polyether polyol.