A method and composition for reducing a coefficient of friction are disclosed. In an embodiment, a method for reducing a coefficient of friction between two surfaces in a borehole includes preparing a mixture comprising a primary lubricating agent, a primary surfactant, a spreading agent, and an aqueous fluid. The method also includes pumping the mixture into the borehole such that the mixture contacts the two surfaces and reduces the coefficient of friction for the two surfaces.

The present invention relates to dielectric fluids and esters, particularly to ester compositions suitable for use in dielectric fluid compositions as well as to dielectric fluid compositions, methods of manufacturing ester compositions and dielectric fluid compositions, and to electrical apparatus containing the dielectric fluids.

A composition including one or more aromatic alkanoate monoester compounds represented by the formulae (I) and (II) as defined herein. The composition has a viscosity (Kv.sub.100) from about 1 cSt to about 10 cSt at 100 C. as determined by ASTM D445, a viscosity index (VI) from about 100 to about 300 as determined by ASTM D2270, and a Noack volatility of no greater than 50 percent as determined by ASTM D5800. A process for producing the composition, a lubricating oil base stock and lubricating oil containing the composition, and a method for improving one or more of thermal and oxidative stability, solubility and dispersancy of polar additives, deposit control and traction control in a lubricating oil by using as the lubricating oil a formulated oil containing the composition.

A composition including one or more monomethyl ester compounds represented by the formula:

##STR00001##

R.sub.1 is a monomethyl branched C.sub.15 to C.sub.19 alkyl group and R.sub.2 is an unsubstituted C.sub.2 to C.sub.30 linear alkyl group. The composition has a viscosity (Kv.sub.100) from 1 cSt to 10 cSt at 100 C. as determined by ASTM D445, a viscosity index (VI) from 100 to 300 as determined by ASTM D2270, a pour point from 0 C. to 50 C. as determined by ASTM D97, and a Noack volatility of no greater than 50 percent as determined by ASTM D5800. A process for producing the composition, a lubricating oil base stock and lubricating oil containing the composition, and a method for improving one or more of cold flow properties, thermal and oxidative stability, solubility and dispersancy of polar additives, deposit control and traction control in a lubricating oil by using as the lubricating oil a formulated oil containing the composition.

The present invention is a lubricating oil composition containing, per 100 parts by mass of (A) an ester compound of a neopentyl polyol having 5 to 10 carbon atoms and a valence of alcohol of 2 to 6 and a linear unsaturated fatty acid having 16 to 22 carbon atoms, 0.1 to 1.5 parts by mass of a specific (B) acid phosphate ester amine salt, 0.01 to 0.25 parts by mass of a specific (C) succinic acid monoester, and 0.01 to 0.25 parts by mass of (D)N-oleoylsarcosine. According to the present invention, it is possible to provide a lubricating oil composition which is excellent in biodegradability, lubricity (anti-wear property), and rust preventive property against seawater, which is low in toxicity and accumulation to aquatic organisms, and further which is excellent in oxidation stability even in the presence of seawater.

In the field of lubricating compositions, notably lubricant compositions for automobile vehicles, in particular to the field of lubricant compositions for transmissions, for gear boxes or for bridges, there is disclosed a lubricating composition including at least 30% by weight of the composition of at least one monoester, at least one polyalphaolefin oil (PAO) for which the kinematic viscosity measured at 100 C. ranges from 40 to 3,000 mm.sup.2.Math.s.sup.1 and at least one polyalphaolefin oil (PAO) for which the kinematic viscosity measured at 100 C. ranges from 1.5 to 10 mm.sup.2.Math.s.sup.1. Also disclosed is the use of this lubricating composition for reducing the fuel consumption of a vehicle equipped with a transmission, notably with a bridge or a gear box, lubricated by this lubricating composition.

The present invention relates to a lubricant and/or clean-out composition comprising: (a) a dispersant component comprising a succinimide dispersant and/or a quaternary ammonium salt dispersant; (b) a carrier fluid component; and (c) an optional corrosion inhibitor, as well as methods of cleaning out deposits in a lubricant system, such as a hydraulic system, using such compositions.

The present invention provides a lubricating oil composition comprising: (A) a lubricant base oil including at least one type selected from mineral oil, PAO, and GTL (gas-to-liquid) base oils; (B) a compound having a structure obtained by independently subjecting propylene oxide to addition polymerization with an alcohol or a structure obtained by subjecting a combination of propylene oxide with ethylene oxide and/or butylene oxide to addition polymerization with an alcohol, and being configured so that polyalkylene glycol (PAG) with an oxygen/carbon weight ratio of 0.35 or more and less than 0.45 and/or one or both terminal hydroxyl groups in the polyalkylene glycol (PAG) are blocked; and (C) a fatty acid ester having an oxygen/carbon weight ratio of 0.05 to 0.35.

This disclosure describes low ash lubricating composition achieving passing steel corrosion, passing high temperature deposit formation, and emulsion stability. The lubricating compositions include one or more select corrosion or rust inhibitor chemistries having an oil-soluble acyclic structure with acidic, hydroxy, or amine moieties but being free of imine, imide, and/or amidine moieties.

A refrigerating machine oil according to the present invention contains a lubricating base oil and alkylated hydroxyanisole, and a working fluid composition for a refrigerating machine according to the present invention contains the refrigerating machine oil and a refrigerant.