An organophosphorus compound has a structure represented by the general formula (I): ##STR00001## The functional groups are defined in the description. The organophosphorus compound has prominent bearing capacity and excellent antiwear and antifriction performances, and can be used as an extreme pressure antiwear additive and used in lubricating oil and lubricating grease.

An organophosphorus compound has a structure represented by the general formula (I): ##STR00001## The functional groups are defined in the description. The organophosphorus compound has prominent bearing capacity and excellent antiwear and antifriction performances, and can be used as an extreme pressure antiwear additive and used in lubricating oil and lubricating grease.

A composition of an oil-soluble ionic detergent that does not contribute metal ions to the composition, and which comprises a quaternary non-metallic pnictogen cation and an organic anion having at least one hydrocarbyl group of sufficient length to impart oil solubility to the detergent, the detergent having a total base number (TBN) to total acid number (TAN) ratio of at least 2:1 imparts ash-free basicity to a lubricant composition.

A composition of an oil-soluble ionic detergent that does not contribute metal ions to the composition, and which comprises a quaternary non-metallic pnictogen cation and an organic anion having at least one hydrocarbyl group of sufficient length to impart oil solubility to the detergent, the detergent having a total base number (TBN) to total acid number (TAN) ratio of at least 2:1 imparts ash-free basicity to a lubricant composition.

An organophosphorus compound has a structure represented by the general formula (I):

##STR00001##

The functional groups are defined in the description. The organophosphorus compound has prominent bearing capacity and excellent antiwear and antifriction performances, and can be used as an extreme pressure antiwear additive and used in lubricating oil and lubricating grease.

An organophosphorus compound has a structure represented by the general formula (I):

##STR00001##

The functional groups are defined in the description. The organophosphorus compound has prominent bearing capacity and excellent antiwear and antifriction performances, and can be used as an extreme pressure antiwear additive and used in lubricating oil and lubricating grease.

A lubricant composition comprising lubricating oil and a compound containing phosphorus and an amine of formula I: ##STR00001##
wherein R.sup.1 is a hydrocarbon group and at least one of R.sup.1 is selected from: (C.sub.1-C.sub.20)alkyl, (C.sub.1-C.sub.20)alkenyl, (C.sub.5-C.sub.20)cycloalkyl; R is selected from: (C.sub.4-C.sub.20)alkyl, (C.sub.4-C.sub.20)alkenyl, (C.sub.5-C.sub.20)cycloalkyl; and wherein R.sup.2, R.sup.3 and R.sup.4 are independently selected from: H, (C.sub.6-C.sub.36)alkyl, (C.sub.6-C.sub.36)alkenyl, (C.sub.6-C.sub.36)cycloalkyl, wherein at least one of R.sup.2, R.sup.3 and R.sup.4 is not H; X is O or S; Y.sup.1 and Y.sup.2 are selected from S and O; m is 1 or 2, n is 0 or 1, p is 1 or 2, provided that m+n+p=3 and q=0.8 to 1.2*p, wherein the compound provides at least 48 ppm of phosphorus and a molar ratio phosphorus to nitrogen (P/N) in the range of about 0.40 to about 1.50.

A lubricant composition comprising lubricating oil and a compound containing phosphorus and an amine of formula I: ##STR00001##
wherein R.sup.1 is a hydrocarbon group and at least one of R.sup.1 is selected from: (C.sub.1-C.sub.20)alkyl, (C.sub.1-C.sub.20)alkenyl, (C.sub.5-C.sub.20)cycloalkyl; R is selected from: (C.sub.4-C.sub.20)alkyl, (C.sub.4-C.sub.20)alkenyl, (C.sub.5-C.sub.20)cycloalkyl; and wherein R.sup.2, R.sup.3 and R.sup.4 are independently selected from: H, (C.sub.6-C.sub.36)alkyl, (C.sub.6-C.sub.36)alkenyl, (C.sub.6-C.sub.36)cycloalkyl, wherein at least one of R.sup.2, R.sup.3 and R.sup.4 is not H; X is O or S; Y.sup.1 and Y.sup.2 are selected from S and O; m is 1 or 2, n is 0 or 1, p is 1 or 2, provided that m+n+p=3 and q=0.8 to 1.2*p, wherein the compound provides at least 48 ppm of phosphorus and a molar ratio phosphorus to nitrogen (P/N) in the range of about 0.40 to about 1.50.

A composition of an oil-soluble ionic detergent that does not contribute metal ions to the composition, and which comprises a quaternary non-metallic pnictogen cation and an organic anion having at least one hydrocarbyl group of sufficient length to impart oil solubility to the detergent, the detergent having a total base number (TBN) to total acid number (TAN) ratio of at least 2:1 imparts ash-free basicity to a lubricant composition.

A lubricating grease composition, including 20 to 96.5 wt %, relative to a total weight of the lubricating grease composition, of a base oil, the base oil containing a basic oil A in a proportion of at least 50 wt %, relative to a total weight of the base oil, wherein the basic oil A is an ester and/or a polyglycol containing unsubstituted ethylene units as a carbon group in a repeating unit. The lubricating grease composition further includes 0.5 to 80 wt %, relative to the total weight of the lubricating grease composition, of an ionic liquid, the anion of the ionic liquid being bis(fluorosulfonyl)imide and 3 to 35 wt %, relative to the total weight of the lubricating grease composition, of a thickener selected from urea, lithium simple soaps, metal complex soaps of elements of the first and second main group of the periodic table, lithium complex soaps, and mixtures thereof.