Abstract

Abstract and SummaryA series of amphoteric surfactants was synthesized by reaction of 1,3‐propanesultone with N‐alkyl‐N′‐(ω,ω‐dimethylaminoalkyl)succinamides. The intermediate succinamides were prepared by reacting methyl N‐alkylsuccinamates, obtained from alkylamines containing 8 to 18 carbon atoms, with N,N‐dimethyl‐1,3‐propylenediamine or N,N‐dimethylethylenediamine neat. The amphoterics were isolated as hygroscopic crystalline solids having superior lime soap dispersing ability, water solubility, and calcium ion stability. Detergency studies at 0.2% concentration (300 ppm water hardness) indicated good washing ability when used alone and excellent performance in combination with soap or in soap‐silicate formulations.

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