A method of preparing a polyurethaneurea aqueous dispersion comprising (a) preparing a prepolymer composition comprising the reaction product of (i) at least one polyol selected from polyethers, polyesters, polycarbonates, and combinations thereof, wherein the polyol has a number average molecular weight of 600 to 4000; (ii) a polyisocyanate comprising a member selected from the group consisting of aromatic diisocyanates, aliphatic diisocyanates, cycloaliphatic diisocyanates, and combinations thereof; (iii) at least one diol compound comprising: (i) hydroxy groups capable of reacting with polyisocyanate, and (ii) at least one carboxylic acid group capable of forming a salt upon neutralization, wherein said at least one carboxylic acid group is incapable of reacting with the polyisocyanate; wherein said prepolymer has a %NCO of 1.3 to 2.6; (b) dispersing the prepolymer in an aqueous composition comprising a neutralizing agent and a surfactant; (c) chain extending the prepolymer to form the polyurethaneurea dispersion wherein the polyurethaneurea polymer has a weight average molecular weight from 40,000 to 250,000; and (d) controlling the molecular weight of the polymer through the use of a blocking agent for isocyanate groups; wherein said blocking agent is at least one mono-functional alcohol and said blocking agent is added to said prepolymer composition at a time selected from (a) before formation of said prepolymer, (b) after formation of said prepolymer, (c) during formation of said prepolymer, and combinations thereof. (a) preparing a prepolymer composition comprising the reaction product of (i) at least one polyol selected from polyethers, polyesters, polycarbonates, and combinations thereof, wherein the polyol has a number average molecular weight of 600 to 4000; (ii) a polyisocyanate comprising a member selected from the group consisting of aromatic diisocyanates, aliphatic diisocyanates, cycloaliphatic diisocyanates, and combinations thereof; (iii) at least one diol compound comprising: (i) hydroxy groups capable of reacting with polyisocyanate, and (ii) at least one carboxylic acid group capable of forming a salt upon neutralization, wherein said at least one carboxylic acid group is incapable of reacting with the polyisocyanate; wherein said prepolymer has a %NCO of 1.3 to 2.6; (i) at least one polyol selected from polyethers, polyesters, polycarbonates, and combinations thereof, wherein the polyol has a number average molecular weight of 600 to 4000; (ii) a polyisocyanate comprising a member selected from the group consisting of aromatic diisocyanates, aliphatic diisocyanates, cycloaliphatic diisocyanates, and combinations thereof; (iii) at least one diol compound comprising: (i) hydroxy groups capable of reacting with polyisocyanate, and (ii) at least one carboxylic acid group capable of forming a salt upon neutralization, wherein said at least one carboxylic acid group is incapable of reacting with the polyisocyanate; (b) dispersing the prepolymer in an aqueous composition comprising a neutralizing agent and a surfactant; (c) chain extending the prepolymer to form the polyurethaneurea dispersion wherein the polyurethaneurea polymer has a weight average molecular weight from 40,000 to 250,000; and (d) controlling the molecular weight of the polymer through the use of a blocking agent for isocyanate groups;