Patent ID: 7445770

Claim:
An aqueous polyurethane dispersion suitable for use in personal care products, the dispersed polyurethane comprising the reaction product of: A) a prepolymer according to the formula: wherein R 1 represents a bivalent radical of a polyol, R 2 represents a radical of an aliphatic or cycloaliphatic polyisocyanate, R 3 represents a radical of a low molecular weight diol, optionally substituted with ionic groups, n is from 0 to 5, and m is >1; B) at least one chain extender according to the formula: H 2 N—R 4 —NH 2 wherein R 4 represents an alkylene or alkylene oxide radical not substituted with ionic or potentially ionic groups; and C) at least one chain extender selected from the group consisting of the sodium salt of N-(2-aminoethyl)-2-aminoethane sulfonic acid and compounds according to the formula: H 2 N—R 5 —NH 2 wherein R 5 represents an alkylene radical substituted with ionic or potentially ionic groups.