Patent ID: 8557387
Filing Date: 2013-10-15
Classification: C08G,C09J,Y10T

Abstract:
1. An aqueous polyurethane-polyurethane urea dispersion comprising a reaction product of: (i) an NCO prepolymer prepared by reacting; (A) one or more di- or higher-functional polyols having a mean molecular weight of 400 to 5000 daltons, (B) optionally one or more di- or higher-functional polyol components having a molecular weight of from 62 to 399 daltons, and (C) one or more di- or poly-isocyanate components; and (ii) a mixture (D) of primary and/or secondary monoamino compounds (D1) and primary and/or secondary diamino compounds (D2); wherein at least one of the amino compounds of the mixture (D) is selected from the group consisting of the sodium or potassium salts of N-(2-aminoethyl)-2-aminoethanesulfonic acid, of N-(3-aminopropyl)-2-aminoethanesulfonic acid, of N-(3-aminopropyl)-3-aminopropanesulfonic acid, and of N-(2-aminoethyl)-3-aminopropanesulfonic acid or of the analogous carboxylic acids; wherein mixture (D) has a mean amino functionality of 1.65 to 1.95; and wherein the equivalent ratio of NCO groups in the NCO prepolymer to the total amount of isocyanate-reactive amino and hydroxyl groups of the mixture (D) is 1.04 to 1.9.