wherein n is an integer from 1-30, or mixtures thereof; one of X and Y is SO3???Z, the other of X and Y is H (i.e. hydrogen), and X and Y are independently assigned in each repeating unit; A1 and A2 are linear or branched, saturated or unsaturated, substituted or unsubstituted, alkyl diradicals wherein the total number of carbons for each repeating unit is independent and in the range of C8 to C22