The invention relates to the use of an O/W emulsion, in particular a PIT emulsion, for lubricating conveyor belt systems in food industries as well as a lubricant concentrate based on an O/W emulsion, in particular a PIT emulsion, of wax esters.

A lubricant including an ionic liquid, which contains a conjugate acid (B.sup.+) and a conjugate base (X.sup.) and is aprotic, wherein the conjugate acid contains a straight-chain hydrocarbon group having 10 or more carbon atoms, and wherein an acid that is a source of the conjugate base has a pKa in water of 0 or less.

A lubricant including an ionic liquid, which contains a conjugate acid (B.sup.+) and a conjugate base (X.sup.) and is aprotic, wherein the conjugate acid contains a straight-chain hydrocarbon group having 10 or more carbon atoms, and wherein an acid that is a source of the conjugate base has a pKa in water of 0 or less.

A lubricant including an ionic liquid, which includes a conjugate acid (B.sup.+) and a conjugate base (X.sup.), and is protic, wherein the conjugate acid includes a straight-chain hydrocarbon group having 10 or more carbon atoms, and wherein the conjugate base is represented by the following general formula (1):

##STR00001##

where n is an integer of from 0 to 6 in the general formula (1).

A lubricant including an ionic liquid, which includes a conjugate acid (B.sup.+) and a conjugate base (X.sup.), and is protic, wherein the conjugate acid includes a straight-chain hydrocarbon group having 10 or more carbon atoms, and wherein the conjugate base is represented by the following general formula (1):

##STR00001##

where n is an integer of from 0 to 6 in the general formula (1).

The present invention relates to novel ionic liquids comprising polyethercarboxylate groups as anions, alkyl ammonium groups as cations, a process of preparation of said ionic liquids and its use in high duty lubricant.

Provided is a lubricant including a deep eutectic solvent consisting of a hydrogen bond acceptor and a hydrogen bond donor, the lubricant having a halogen atom content of 0.1% by mass or less. The lubricant provided contains a carbon-neutral component, and shows a favorable lubricating property and low corrosiveness to metals.

Provided is a lubricant including a deep eutectic solvent consisting of a hydrogen bond acceptor and a hydrogen bond donor, the lubricant having a halogen atom content of 0.1% by mass or less. The lubricant provided contains a carbon-neutral component, and shows a favorable lubricating property and low corrosiveness to metals.

A grease composition comprising: (i) a mineral base oil containing one or more of fatty ammonium carboxylate salts of formula (I),

##STR00001## wherein R.sup.1 is selected from C.sub.12 to C.sub.20 saturated or unsaturated, branched or straight-chain hydrocarbyl groups; X is selected from NH, .sup.+NH.sub.2 and N(R.sup.4)NH.sub.3.sup.+; R.sup.2 and R.sup.4 are independently selected from C.sub.2 to C.sub.8 saturated or unsaturated, branched or straight chain hydrocarbyl groups, and may be the same or different; R.sup.3 is selected from C.sub.12 to C.sub.26 saturated or unsaturated, branched or straight-chain hydrocarbyl groups; and n is 1 or 2; and (ii) a simple lithium soap thickener, wherein said lubricating grease composition is prepared by a process comprising the steps of combining the mineral base oil with the one or more fatty ammonium carboxylate salts of formula (I) and then thickening said base oil fatty ammonium carboxylate salt mixture with the simple lithium soap thickener.

A grease composition comprising: (i) a mineral base oil containing one or more of fatty ammonium carboxylate salts of formula (I),

##STR00001## wherein R.sup.1 is selected from C.sub.12 to C.sub.20 saturated or unsaturated, branched or straight-chain hydrocarbyl groups; X is selected from NH, .sup.+NH.sub.2 and N(R.sup.4)NH.sub.3.sup.+; R.sup.2 and R.sup.4 are independently selected from C.sub.2 to C.sub.8 saturated or unsaturated, branched or straight chain hydrocarbyl groups, and may be the same or different; R.sup.3 is selected from C.sub.12 to C.sub.26 saturated or unsaturated, branched or straight-chain hydrocarbyl groups; and n is 1 or 2; and (ii) a simple lithium soap thickener, wherein said lubricating grease composition is prepared by a process comprising the steps of combining the mineral base oil with the one or more fatty ammonium carboxylate salts of formula (I) and then thickening said base oil fatty ammonium carboxylate salt mixture with the simple lithium soap thickener.