The invention relates to aqueous composition comprising water-soluble glycerin-based polyalkylene glycols as synthetic base oils as well as the use of the composition and the glycerin-based polyalkylene glycols as or in metalworking fluids, wherein the glycerin was consecutively alkoxylated in the following order: first with propylene oxide, followed by ethylene oxide and finally with propylene oxide.

A polyester is useful as a high viscosity base fluid. A method for its preparation involves epoxidizing an alpha-olefin, reacting the alpha-epoxide or diol with a saturated linear aliphatic dicarboxylic acid, and isolating the polyester. Lubricant compositions can contain such polyesters and the compositions are useful as automatic transmission fluids, manual transmission fluids, continuously variable transmission fluids, gear oil formulations, industrial gear oil formulations, axle fluid formulations, dual clutch transmission fluids, dedicated hybrid transmission fluids, or as hydraulic oils.

Provided is a lubricant composition including a bicyclic liquid crystal of formula (1), tricyclic liquid crystal compounds of formula (2), and formula (3). The composition is suitable for use in a clean environment, under a high vacuum, under high temperature and a bearing. ##STR00001##
R.sup.1 and R.sup.2 are the same or different from each other, and each is OCH.sub.2CH.sub.2CH(R)CH.sub.2CH.sub.2OR. ##STR00002##
R.sup.11 and R.sup.21 are the same or different from each other, and each is OR. R.sup.12, R.sup.13, R.sup.22 and R.sup.23 are the same or different from each other, and each is hydrogen or a group OR. ##STR00003##
R.sup.31 and R.sup.41 are the same or different from each other, and each is OCH.sub.2CH.sub.2CH(R)CH.sub.2CH.sub.2OR. R.sup.32, R.sup.33, R.sup.42, and R.sup.43 are the same or different from each other, and each is hydrogen or OCH.sub.2CH.sub.2CH(R)CH.sub.2CH.sub.2OR. R is a linear or branched C.sub.nH.sub.2n+1, 1?n?20, and R is methyl or ethyl.

The invention provides a lubricating oil composition comprising: a base oil; and coated particles made of nanoparticles and phosphonic acid coating at least a portion of the surface of the nanoparticles.

The description involves a brush copolymer composition comprising a copolymeric backbone including monomeric repeat units of at least two different acrylate monomers and copolymeric brush arms including monomeric repeat units of at least two different acylated poly(alkylene amine)s, in which the brush arms, the brush copolymer, or both may advantageously exhibit UCST behavior, e.g, in hydrocarbon diluent. Methods of making such copolymers using RAFT and CROP (pseudo-)living reaction processes are also described herein.

The present invention provides liquid crystal (LC)-infused materials and methods for detecting compounds or impurities in liquid samples using such materials. These slippery materials comprise a lubricating liquid, preferably a thermotropic liquid crystal, and a solid substrate able to immobilize or host the lubricating liquid. The portion of the substrate coated by the lubricating fluid forms a slippery surface able to allow droplets of various materials to slide off the slippery surface in a manner dependent on the chemical composition of the droplet, which can be used to detect the presence of analytes, impurities and other molecules within the droplet.

A lubricating oil composition that is hard to increase in viscosity in the low temperature range and is easy to increase in viscosity in the high temperature range. The lubricating oil composition contains a base oil and a viscosity index improver. The base oil contains a mineral oil and an oxygen-containing synthetic oil. The viscosity index improver contains a comb-shaped polymer. The lubricating oil composition has a kinematic viscosity of 100 C. of 9.3 mm.sup.2/s or less, a viscosity index of 280 or more, and a content Y (% by mass) of the oxygen-containing synthetic oil based on the total amount of the lubricating oil composition satisfying the following expression (1): Y<3.7 ln(X)+ (1), where =0.5, =19, and X represents a ratio of the number of carbon atoms and the number of oxygen atoms per one molecule of the oxygen-containing synthetic oil.

A solid lubricating coating film capable of imparting favorable lubricity and corrosion resistance to a connection for oil country tubular goods. Two or more solid lubricants are dispersed in a binder resin. Graphite is contained in an amount of 50% or more and 90% or less of a total weight of the solid lubricants, and the graphite has a scaly shape and an average particle diameter of 10.0 m or less. A solid lubricant made of one or more materials selected from BN, mica, talc, MCA, MoS.sub.2, PTFE, PFA, and FEP is further contained as other solid lubricants of the two or more types of solid lubricants. The binder resin contains a PEEK resin having an average particle diameter of 20 m or less as a main component, and the PEEK resin is contained in an amount of 70% or more of a total weight of the binder resin.

A water-based lubricating grease composition includes at least 40 wt % water; a salt-based thickener; a polymer-based thickener; and optionally, an inorganic solid-based thickener. A process for preparing the water-based lubricating grease composition may include blending a suitable amount of water with a salt-based thickener to provide a thickened water-based grease, wherein the salt-based thickener is obtained from contacting a base with a fat; and adding a polymer-based thickener to the thickened water-based grease.

The invention is directed to environmentally stable solid lubricant coatings with bilayer transition-metal dichalcogenide structures that are designed to resist the effects of oxidation during long term storage, or during short exposures under conditions that would oxidize similar films that do not have these bilayer structures. In addition to improving oxidation resistance, these bilayer structures also facilitate the more rapid establishment of a low, steady-state friction coefficient than is possible with similar films that do not have these bilayer structures.