Patent ID: 6284836
Filing Date: 2001-09-04
Classification: C08G,C09D,C14C,Y10T

Abstract:
An aqueous polyurethane dispersion comprising a polyurethane having an OH functionality of 2 to 6 and a number average molecular weight of less than 15,000 prepared by reacting(a) at least one polyol having a number average molecular weight of 500 to 6000 g/mol,(b) at least one polyol having a molecular weight of less than 500 g/mol,(c) at least one aliphatic polyisocyanate,(d) at least one diol having a molecular weight of less than 450 g/mol and bearing one or more ionic groups and/or one or more potentially ionic groups,(e) at least one amine that is reactive towards NCO groups, bears hydroxyl groups, and has an OH functionality of 1 to 6,(f) water, and(g) a C.sub.1 -C.sub.10 aliphatic monoalcohol,wherein the molar ratio of polyol (a) to the sum of polyol (b) and diol (d) is 1:1.5 to 1:4 and the molar ratio of the sum of polyol (a), polyol (b), and diol (d) to polyisocyanate (c) is 1:1.1 to 1:2.5.