Modulus modification of water borne polyurethane-ureas

Claim 1

A stable aqueous dispersion of an ionic polyurethane-polyurea prepared by the reaction of: A. an aqueous dispersion of an isocyanate terminated ionic prepolymer prepared in the absence of solvent from: (i) an aliphatic or cycloaliphatic diisocyanate; (ii) a polyol mixture comprising: (a) from about 50 to about 95 equivalent percent of a polyalkyleneoxy diol having a molecular weight of from about 500 to about 6,000; and (b) from about 50 to about 5 equivalent percent of a polyalkyleneoxy triol having a molecular weight of from about 500 to about 3,000; and (iii) a carboxylic acid containing diol wherein said acid is neutralized with a tertiary amine after said prepolymer formation to form said ionic function prior to forming said aqueous dispersion, wherein said (iii) is present in sufficient proportions to provide about 10 to about 150 milliequivalents of said ionic groups per 100 grams of said prepolymer and further, wherein the proportions of said (i), (ii), and (iii) are such that the ratio of isocyanate equivalents to the total isocyanate-reactive equivalents falls in a range of from about 1.1 to about 3; and B. an alkylene diamine wherein the proportions of said (A) and (B) are such that the ratio of equivalents of isocyanate in (A) to amine equivalents in (B) falls in a range of from about 1.25 to about 0.90.