wherein R is a hydrocarbon group containing from about 4 to about 30 carbon atoms, A is an oxyalkylene group selected from the group consisting of oxyethylene, oxypropylene, oxybutylene, oxytetramethylene and heteric and block mixtures thereof, n is an integer from 1 to 8 and M is a cation of a water-soluble salt, and wherein when the average value of n is from 1 to 8, at least about 85% by weight