Abstract: Useful as additive for lubricating oils are novel phosphosulphur compounds in accordance with the general formula (I):(((R.sup.1 --S.sub.x --O.sub.y --A--).sub.r B.sub.v).sub.p P(X)--Y.sub.i --).sub.q Z.sub.min which e.g. R.sup.1 represents an alkyl or alkenyl group, A represents the group --(CH.sub.2).sub.n --O--, B represents the group --P(S)--S--CH.sub.2 --(CH.sub.3)--O--, X represents an oxygen atom or a sulphur atom, Y represents an oxygen atom, a sulphur atom or an oxygen or sulphur-containing hydrocarbon chain, Z represents a hydrogen, chlorine or sulphur atom, a polysulphide chain, a metal or an alkyl or alkenyl group, x=1,2 or 3, y=0, 1 or 2, v is 0 or 1, r is 1 (if v=0) or r=2 (if v=1), p=2 or 3, t=0 or 1, m=0,1 or 2, q=the valency of Z if Z is a metal or q=1 or 2 and n is an integer from 1 to 30.

Abstract: Novel sulfurized compounds, their preparation and use. The compounds are based on the general formula{[R-S.sub.x --(CH.sub.2).sub.n --].sub.z CH.sub.3-z --(CH.sub.2).sub.p --}.sub.2 S.sub.y,in which R is a monovalent hydrocarbon radical having 1 to 30 carbon atoms, optionally functionalized; x is a number equal to or greater than 1; z is an integer equal to 1 or 2; when z=1, n is an integer from 0 to 3 and p is an integer from 0 to 3, with n+p being an integer from 0 to 3; when z=2, n is an integer from 1 to 3 and p is an integer from 0 to 3; and y is a number equal to or greater than 1, at least one of the numbers x and y being strictly greater than 1. The sulphurized compounds can be used as extreme pressure or wear prevention additives in lubricating oils, in particular in oils for gear systems and those used in working metal.

Abstract: New sulfurized compounds, their preparation and their use are described. They correspond to the general formula: {[R--S.sub.X --(CH.sub.2).sub.n --].sub.z CH.sub.3-z --(CH.sub.2).sub.P --}.sub.2 S.sub.y, in which R represents a monovalent hydrocarbon radical with 1 to 30 carbon atoms, optionally functionalized; x is a number equal to or greater than 1; z is an integer equal to 1 or 2; when z=1, n is an integer from 0 to 3 and p is an integer from 0 to 3, with n+p being an integer from 0 to 3; when z=2, n is an integer from 1 to 3 and p is an integer from 0 to 3; and y is a number equal to or greater than 1, at last one of the numbers x and y being strictly greater than 1. These sulfurized compounds can be used as extreme-pressure and anti-wear additives in lubricating oils, in particular oils for gear systems and oil for working metals.

Abstract: Useful as additive for lubricating oils are novel phosphosulphur compounds in accordance with the general formula (I):(((R.sup.1 --S.sub.x --O.sub.y --A--).sub.r B.sub.v).sub.p P(X)--Y.sub.t --).sub.q Z.sub.min which e.g. R.sup.1 represents an alkyl or alkenyl group, A represents the group --(CH.sub.2).sub.n --O--, B represents the group --P(S)--S--CH.sub.2 --(CH.sub.3)--O--, X represents an oxygen atom or a sulphur atom, Y represents an oxygen atom, a sulphur atom or an oxygen or sulphur-containing hydrocarbon chain, Z represents a hydrogen, chlorine or sulphur atom, a polysulphide chain, a metal or an alkyl or alkenyl group, x=1,2 or 3, y=0, 1 or 2, v is 0 or 1, r is 1 (if v=0) or r=2 (if v=1), p=2 or 3, t=0 or 1, m=0,1 or 2, q=the valency of Z if Z is a metal or q=1 or 2 and n is an integer from 1 to 30.

Abstract: Novel (poly)sulfurized carboxylic compounds, their preparation, and their use as additives to lubricating oils are disclosed. Such novel carboxylic compounds are more particularly esters of the general formula:[R.sup.3 --OC(O)--].sub.q R.sup.2 {--C(O)O--(CH.sub.2).sub.m --CH.sub.3-z [--(CH.sub.2).sub.n --S.sub.x --R.sup.1 ].sub.z }.sub.p (1)wherein R.sup.1 is a saturated or unsaturated monovalent aliphatic radical with 1 to 30 carbon atoms; the number x is equal to or greater than 1; z equals 1 or 2; when z equals 1, n is an integer from 0 to 5 and m an integer from 0 to 0.5, with m+n an integer from 1 to 10; when z equals 2, n is an integer from 1 to 5 and m an integer from 0 to 5, with m+n an integer from 1 to 10; R.sup.2 is a hydrocarbon radical with 1 to 31 carbon atoms and a valency of p+q; R.sup.3 is a hydrogen atom or an aliphatic radical with 1 to 30 carbon atoms; p is an integer from 1 to 4; and q is an integer from 0 to 3, with p+q being an integer from 1 to 4.