R. Lagerman et al., SYNTHESIS AND PERFORMANCE OF ESTER QUATERNARY BIODEGRADABLE SOFTENERS, Journal of the American Oil Chemists' Society, 71(1), 1994, pp. 97-100
Reaction of hydroxyethylpiperazine with two moles of fatty acid, follo
wed by quaternization with methyl chloride, methyl bromide or dimethyl
sulfate, resulted in new quaternaries useful as biodegradable fabric
softeners. Additional softeners were synthesized from hard tallow prop
ane diamine by reaction with butyrolactone, followed by ethoxylation,
esterification with one mole of fatty acid and quaternization.