Patent ID: 8372939

Claim:
A polyurethane comprising the one step reaction product of: a) aliphatic polyisocyanate; b) a primary amine-terminated polyether with an amine functionality of about 2 and a molecular weight of equal to or greater than 400; c) a polyol having an average nominal hydroxyl functionality greater than or equal to 2 and an average hydroxyl equivalent weight of from about 300 to about 2000, d) an aromatic diamine; e) optionally, a cross linking agent with isocyanate reactive groups, having a functionality of equal or greater than about 3, and a molecular weight of less than 400 wherein the relative amount of stoichiometric equivalents of the polyisocyanate to isocyanate reactive groups is between 0.95:1 and 1.2:1, the relative amount of stoichiometric equivalents of the polyol to the primary amine terminated polyether is between 0.49:1 and 4.99:1, the ratio in stoichiometric equivalents of components a to b is between 9:1 and 24:1 and the ratio of stoichiometric equivalents of component a to components b, c and e is between 2.7:1 and 4.5:1.