{(R1)2N((CH2)nER2)2}+X???wherein each R1 group is independently selected from C1-4 alkyl, hydroxyalkyl or C2-4 alkenyl; and wherein each R2 is independently selected from C8-28 alkyl or alkenyl groups; E is an ester moiety i.e., ???OC(O)??? or ???C(O)O???, n is from 0-5, and X??? is a suitable anion, for example chloride, methosulfate and mixtures thereof.