Phosphorus, nitrogen and sulfo-containing additives

A process for preparing a sulfur-, nitrogen- and phosphorous-containing composition which comprises reacting one or more phosphorus compounds of the formula ##STR28## wherein each X is independently oxygen or divalent sulfur, M is a hydrogen, an equivalent of a metal or ammonium cation, R is hydrogen or a hydrocarbyl, hydrocarbyloxy, or hydrocarbyl mercapto group of about one to about 30 carbon atoms, and R' is XM or R, with the proviso that the total number of carbon atoms in both R and R' is at least two, with

• B. one or more sulfo- and nitrogen-containing compounds of the general formulae ##STR29## wherein y is one or two, each R.sup.3 is independently hydrogen or lower alkyl group of one to seven carbon atoms, R.sup.2 is di- or trivalent hydrocarbyl group having one to eighteen carbon atoms, R.sup.4 is a trivalent hydrocarbyl group having one to eighteen carbon atoms, and Q is selected from the group consisting of --OH, --OR.sup.3, --OM, --O(Alkylene-O).sub.n --R.sup.3, --N(R.sup.3).sub.2, --NR.sup.3 (Alkylene-NR.sup.3).sub.n R.sup.3, --OH(R.sup.3).sub.4, and -ONR.sub.3.sup.3 -(Alkylene-NR.sup.3).sub.n R.sup.3, wherein n has an average value of about one to about ten, M is as defined in (A) and the alkylene group has from one to ten carbon atoms.