The instant disclosure relates to a lubricant composition having an oil of lubricating viscosity, a polymeric surfactant compound that is an acylated polymer having a number average molecular weight of about 500 to about 50,000 where the polymer comprises a branched olefin having from 8 to 30 carbon atoms. The acylated polymer can further be reacted with an amine or alcohol to form an amide, imide, ester or combinations thereof. The present disclosure further relates to lubricant compositions that exhibit good dispersancy and viscometric performance.

The instant disclosure relates to a lubricant composition having an oil of lubricating viscosity, a polymeric surfactant compound that is an acylated polymer having a number average molecular weight of about 500 to about 50,000 where the polymer comprises a branched olefin having from 8 to 30 carbon atoms. The acylated polymer can further be reacted with an amine or alcohol to form an amide, imide, ester or combinations thereof. The present disclosure further relates to lubricant compositions that exhibit good dispersancy and viscometric performance.

The present disclosure relates to microencapsulated friction modifiers additives used in lubricants or other solutions, to their preparation, and to the use thereof to improve fuel economy of the engines and machines by enhancing friction reduction and prolonging the friction reduction time period.

The present disclosure relates to microencapsulated friction modifiers additives used in lubricants or other solutions, to their preparation, and to the use thereof to improve fuel economy of the engines and machines by enhancing friction reduction and prolonging the friction reduction time period.

An aspect of the present invention provides a refrigerating machine oil containing: a lubricating base oil; a phosphorus-containing additive; and a polymer comprising an unsaturated carboxylic acid ester as a monomer unit.

An aspect of the present invention provides a refrigerating machine oil containing: a lubricating base oil; a phosphorus-containing additive; and a polymer comprising an unsaturated carboxylic acid ester as a monomer unit.

A defoaming agent obtainable by a process that includes: polymerizing (A) at least one polymerizable monomer in a composition, the composition comprising (C) a solvent and (B) at least one non-polymerizable polysiloxane dissolved in the (C) solvent, wherein the component (A) optionally comprises at least one Si-atom-containing monomer in an amount of less than 10 mass % on the basis of the total mass of the component (A).

An aspect of the present invention provides a refrigerating machine oil containing a mixed base oil of a first hydrocarbon base oil having a kinematic viscosity at 40° C. of less than 6 mm.sup.2/s and a second hydrocarbon base oil having a kinematic viscosity at 40° C. of 6 mm.sup.2/s or more, wherein a (A)/(B) ratio is more than 1 and 1.5 or less, wherein (A) is a kinematic viscosity at 40° C. of the mixed base oil, and (B) is the kinematic viscosity at 40° C. of the first hydrocarbon base oil.

An aspect of the present invention provides a refrigerating machine oil containing a mixed base oil of a first hydrocarbon base oil having a kinematic viscosity at 40° C. of less than 6 mm.sup.2/s and a second hydrocarbon base oil having a kinematic viscosity at 40° C. of 6 mm.sup.2/s or more, wherein a (A)/(B) ratio is more than 1 and 1.5 or less, wherein (A) is a kinematic viscosity at 40° C. of the mixed base oil, and (B) is the kinematic viscosity at 40° C. of the first hydrocarbon base oil.

A lubricant composition comprising a base oil; at least one additive; and 0.001-10% by weight, based on the total weight of the lubricant composition, of an organic compound comprising both a polar moiety and a nonpolar moiety, as lubricity improver, wherein the organic compound has a relative permittivity ε.sub.r in the range from 1.5 to 10, and a quotient ∫S.sub.1/∫S.sub.2 for the organic compound is in the range from 1 to 25, wherein ∫S.sub.1 denotes the sum total of the area(s) of the IR absorption band(s) in the wavenumber range of 3100-2750 cm.sup.−1 in an ATR spectrum of the organic compound, and ∫S.sub.2 denotes the sum total of the area(s) of the IR absorption band(s) in the wavenumber range of 1800-1650 cm.sup.−1 in an ATR spectrum of the organic compound.