Abstract
The preparation of amphoteric surfactants by the condensation of mixed N-alkylethylenediamines and unsaturated acid derivatives, particularly acrylic acid esters, was studied. The reaction proceeded readily near 100 C either neat or with solvents. Saponification of the ester products yielded salts which were water-soluble. The mono- and disodium salts of mixed N-alkyl (C11.5 av) ethylenediamine dipropionic and diisobutyric acid (crotonic acid derived) as 1% active in water were completely soluble at all pH levels. The solutions demonstrated no perceptible isoelectric range on addition of 1–10% concentrations of sodium chloride. Data on surface tension, solubility, calcium tolerance, foam, viscosity, color, and density are presented.
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Bluestein, C., Rosenblatt, W., Clark, J.R. et al. Amphoteric surfactants from mixed N-alkylethylenediamine. J Am Oil Chem Soc 50, 532–536 (1973). https://doi.org/10.1007/BF02640527
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DOI: https://doi.org/10.1007/BF02640527