Patent ID: 8716396

Claim:
A nonfluorinated polyurethane comprising (a) a plurality of siloxane units and (b) a plurality of organic polyoxy units, wherein at least one of the organic polyoxy units has an ionizable group, and wherein the ionizable group is a neutral group or a salt thereof, and wherein (1) a siloxane unit is linked to an organic polyoxy unit by a urethane group, wherein the siloxane unit has a molecular weight from 500 to 7,500; (2) the polyurethane comprises one or more terminal amino groups; and (3) the polyurethane comprises a plurality of urea groups, wherein the polyurethane is derived from a first polyisocyanate, a silicon polyol, and an organic polyol comprising an ionizable group, wherein the ionizable group is a neutral group or a salt thereof, wherein the ratio of the first polyisocyanate to silicon polyol is from is 2.085:1 to 4.5:1 and the ratio of the first polyisocyanate to organic polyol is from is 1.5:1 to 3.0:1, and wherein the reaction between the free first polyisocyanate and one or more isocyanate groups present on the polyurethane with water produces the one or more terminal amino groups and the plurality of urea groups.