Patent ID: 8901232

Claim:
A waterborne urethane polymer dispersion comprising: a) an aqueous continuous phase being at least 25 wt. % water; b) a dispersed polyurethane phase(s) with an acid number less than 12.6 mg KOH/gram, wherein said polyurethane phase(s) comprises a reaction product(s) of b1) about 20 wt. % or less comprising reactants characterized as a polyisocyanate(s), wherein at least 80 wt. % of said polyisocyanates are aromatic diisocyanates, and b2) about 80 wt. % or more of one or more reactants characterized as multi-functional isocyanate-reactive compounds, wherein at least 80 wt. % of said multi-functional isocyanate-reactive compounds i) are above 2000 number average molecular weight, ii) are selected from the group consisting of polyethers of 3 to 5 carbon atoms per repeat unit, polycarbonates, polydienes, and mixtures thereof, and iii) have a functionality when reacting with isocyanates of about 1.95 to about 2.05; c) optionally a polyacrylate phase existing primarily within the dispersed polyurethane phase and/or separately dispersed in the aqueous continuous phase, wherein said polyacrylate is characterized by having an estimated glass transition temperature of less than minus 10° C.; and d) a crosslinker for the polyurethane phase and/or the polyacrylate phase in an amount from about 0.5 to about 5 wt. % based on the solids of the combined polyacrylate phase and polyurethane phase.