It is also possible to use alkyl-D-galactoside uronic acids and salts thereof, polyoxyalkylenated (C6-C24)alkyl ether carboxylic acids, polyoxyalkylenated (C6-C24)alkylaryl ether carboxylic acids, polyoxyalkylenated (C6-C24)alkylamido ether carboxylic acids and salts thereof, in particular those containing from 2 to 50 alkylene oxide and in particular ethylene oxide groups, and mixtures thereof.Th