Organic Builders. X.

Abstract

The physico-chemical properties of the aqueous solutions of some of chelating-type ether polycarboxylates containing malonate groups and/or acetate groups were measured and compared with that of sodium tripolyphosphate (STPP). And the correlation between the building performances and those properties has been discussed.The detergency were tested on naturally soiled cotton patches and the detergency powers were evaluated by Scheffe's method in a detergent system formulating alkylbenzenesulfonate (LAS). Measurements were made on the surface tensions, the critical micelle concentrations, and the emulsifying capacities of the builder solutions with sodium dodecylbenzenesulfonate (DBS), The buffering and dispersing capacities for carbon black and manganese dioxide in the aqueous builder solutions, and the chelate stability constants of the builders against alkaline earth metals were determined.These results indicated that the washing efficiencies of the detergents containing malonate-type as well as acetate-type builders correlated well with calcium ion sequestration capacities, but did not correlate well with their dispersing capacities for manganese dioxide of the aqueous malonate-type builder solutions.Other physico-chemical properties of the builder solutions had no relation to their washing efficiencies.