The Interaction Of Dimethyl Ditallow Ammonium-Chloride And Sodium Linear Alkylbenzene Sulfonate

The interaction of a commercial sample of dimethyl ditallow ammonium chloride (Adogen� 470E) and sodium alkylbenzene sulfonate (C-550 LAS) in aqueous solution was examined. Interaction was very strong, with the ion pair association constant estimated to be 1 � 106 1/mol. At laundry use level concentrations, the mixtures were turbid. The highest turbidity was found at equimolar concentrations of C-550 LAS and Adogen� 470E. Turbidity was assumed to be due to the formation of an insoluble 1:1 complex. Both filtered and unfiltered mixtures of C-550 LAS and Adogen� 470E were evaluated for detergency, softening and antistat performance. As the mixtures approached 1:1 stoichiometry, detergency decreased and softening and antistat performance improved. Lower detergency was explained by the loss from solution of LAS to form a 1:1 LAS-dimethyl ditallow ammonium complex. Improved softening and antistat perfromance were explained by adsorption of the insoluble complex on the cloth.