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

摘要

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.

主权项

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.