(i) the reaction product mixtures of higher fatty acids with hydroxyalkylalkylenediamines in a molecular ratio of about 2:1, said reaction product containing a composition having a compound of the formula: wherein R1 is an acyclic aliphatic C15-C21 hydrocarbon group and R2 and R3 are divalent C1-C3 alkylene groups; commercially available as Mazamide 6 from PPG; (ii) the reaction product of higher