This method for producing a lubricating oil composition includes: a step of dissolving fullerenes in a base oil mainly composed of a multiply alkylated cyclopentane oil or an ionic liquid containing an imide as a negative ion to obtain a fullerene solution; and a step of producing fullerenes adduct by subjecting the above-described fullerene solution to a heat treatment in a non-oxidizing atmosphere.

A lubricant including an ionic liquid including a conjugate base and a conjugate acid, wherein the conjugate acid includes a group including a hydroxyl group and a group including a straight-chain hydrocarbon group having 6 or greater carbon atoms, and a pKa of an acid that is a source of the conjugate base in acetonitrile is 10 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 ionic liquid is represented by the following general formula (1), and wherein the conjugate base is a conjugate base of sulfonic acid, a conjugate base of sulfonimide, or a conjugate base of trisulfonylmethide: ##STR00001##
where R.sup.1 and R.sup.2 each represent a hydrogen atom or R.sup.1 and R.sup.2 form a benzene ring together with carbon atoms to which R.sup.1 and R.sup.2 are bonded, R.sup.3 represents a to straight-chain hydrocarbon group having 10 or more carbon atoms, and R.sup.4 represents a hydrogen atom or a hydrocarbon group in the general formula (1).

Provided is a lubricant for magnetic recording medium, where the lubricant includes an ionic liquid including an anionic component and a cationic component, wherein the anionic component includes a fluorine-containing chain having a number average molecular weight of 1,500 or less, the cationic component is a cation of cyclic amidine, and the cation of the cyclic amidine includes a fluorine-containing chain that is either a perfluoroalkyl chain or a perfluoropolyether chain.

An ammonium-based ionic liquid compound including a tri-n-octylmethylammonium cation and a carboxylate anion. A lubricant composition including it, and its use as a detergent and/or anti-corrosion additive in a lubricant, in particular a marine lubricant.

The present disclosure provides an ionic liquid produced from a renewable source and with excellent lubricating properties, and methods of making the same. The ionic liquid includes an anion salt of at least one of a fatty acid, a rosin acid, or derivative thereof. The method for making the ionic liquid or lubricant composition of the present disclosure includes admixing a cation and an anion in a ratio of about a 1.5:1 to about 1:1.5 at room temperature to form a reaction mixture, wherein the anion comprises at least one of a fatty acid, a rosin acid, derivative thereof, or a combination thereof, and the cation comprises at least one of choline, imidazolium, pyridium, pyrrolidinium, ammonium, phosphonium, sulfonium, derivatives thereof, or combinations thereof; maintaining the reaction mixture at a pH of about 6 to about 9; and drying under reduced pressure to yield a lubricant including an ionic liquid.

A lubricant for a magnetic recording medium including an ionic liquid including a Bronsted acid and a Bronsted base that is primary amine as constituents of the ionic liquid, wherein the Bronsted acid includes a fluorine-containing chain, the Bronsted base includes a fluorine-containing chain that is a perfluoroalkyl chain or a perfluoropolyether chain, wherein the fluorine-containing chain in the Bronsted acid is a perfluoropolyether chain or the fluorine-containing chain in the Bronsted base is the perfluoropolyether chain, or the fluorine-containing chain in the Bronsted acid is the perfluoropolyether chain and the fluorine-containing chain in the Bronsted base is the perfluoropolyether chain, and a number average molecular weight of the fluorine-containing chain in the Bronsted acid is 1,500 or less.

A lubricant, which includes an ionic liquid including a conjugate base and a conjugate acid, wherein the conjugate acid is represented by General Formula (A) below, and wherein a pKa of an acid that is a source of the conjugate base in acetonitrile is 10 or less, ##STR00001##
where, in General Formula (A), R.sub.1, R.sub.2, and R.sub.3 are each independently a group including a hydrocarbon group, with the proviso that at least one of the hydrocarbon groups in R.sub.1, R.sub.2, and R.sub.3 is a straight-chain hydrocarbon group having 6 or greater carbon atoms.

A method and system for lubricating at least one moving part with a lubricating medium includes a chamber configured to house at least one moving part, a lubricant reservoir configured to house a liquid lubricant, a gas reservoir configured to house a gas, and a controller configured to supply a first amount of the gas in the form of bubbles to a second amount of the liquid lubricant to entrain the bubbles of gas in the liquid lubricant. The controller is also configured to regulate proportions of the liquid lubricant and the gas as a function of at least one operating condition, including at least one of pressure, temperature, and flow rate, a solubility relationship between the liquid lubricant and the gas, and a size of the bubbles of gas, and supply the liquid lubricant with entrained bubbles of gas to at least one moving part.

A lubricant including an ionic liquid wherein the ionic liquid includes a cation that is represented by General Formula (A) below and is free from a fluorine atom, and an anion that is represented by General Formula (X) below and is free from a fluorine atom,

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