A refrigerating machine oil containing: a lubricating base oil; and a compound represented by the following formula (1): ##STR00001## wherein R.sup.1 and R.sup.2 each independently represent a monovalent hydrocarbon group, R.sup.3 represents a divalent hydrocarbon group, and R.sup.4 represents hydrogen atom or a monovalent hydrocarbon group, and the refrigerating machine oil having a kinematic viscosity at 100° C. of 0.5 mm.sup.2/s or more and 2.5 mm.sup.2/s or less.

A refrigerating machine oil containing: a lubricating base oil; and a polymer additive, wherein a carbon residue of 10% residual oil is 0.05% by mass or more.

The present invention relates to compositions for use in refrigeration, air-conditioning, and heat pump systems wherein the composition comprises a fluoroolefin and at least one other component. The compositions of the present invention are useful in processes for producing cooling or heat, as heat transfer fluids, foam blowing agents, aerosol propellants, and fire suppression and fire extinguishing agents.

The present invention relates to a refrigerator oil for a mixed refrigerant containing less than 40% by mass of an unsaturated fluorinated hydrocarbon compound (HFO) on a basis of the whole amount of the mixed refrigerant, the refrigerator oil containing a base oil (P) including at least one selected from the group consisting of a polyvinyl ether (PVE), a polyalkylene glycol (PAG), a copolymer (ECP) of a poly(oxy)alkylene glycol or a monoether thereof and a polyvinyl ether, and a polyol ester (POE), with a hydroxy value of the base oil (P) being 15 mgKOH/g or less; and a refrigerator oil composition containing the foregoing refrigerator oil and a specified refrigerant.

A refrigerating oil comprising a lubricating base oil, a first extreme pressure agent containing sulfur and phosphorus as constituent elements and a second extreme pressure agent containing phosphorus but not containing sulfur as constituent elements, and having a kinematic viscosity at 100° C. of 0.5 mm.sup.2/s or more and 2.5 mm.sup.2/s or less.

The invention relates to a lubricating oil composition and a refrigerant composition containing a polyalkylene glycol having a terpenoid end group, such as a farnesol end group.

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 composition comprising a heat transfer portion and a lubricating portion, wherein the lubricating portion comprises one or more compounds according to formula (I) of the present disclosure, wherein W is H; Y is independently selected from the group consisting of F, Cl, Br and I; Z is independently selected from the group consisting of H, OH, (CW.sub.2).sub.PCW.sub.3, CY.sub.3, OCW.sub.3, O(CW.sub.2).sub.pCW.sub.3, OCW((CY.sub.2).sub.mCY.sub.3)CWCW.sub.2, polyalkylene glycol and polyolester; n is an integer from 2 to 250; m is an integer from 0 to 3; and p is an integer from 0 to 9.

The present invention relates to compositions for use in refrigeration, air-conditioning, and heat pump systems wherein the composition comprises a fluoroolefin and at least one other component. The compositions of the present invention are useful in processes for producing cooling or heat, as heat transfer fluids, foam blowing agents, aerosol propellants, and fire suppression and fire extinguishing agents.

The lubricating oil composition for a refrigerator according to the present invention is a lubricating oil composition for a refrigerator containing a base oil containing a low-viscosity base oil component having added thereto a polyoxyalkylene glycol compound having a kinetic viscosity at 100° C. that is higher than the low-viscosity base oil component, and the base oil has a kinetic viscosity at 100° C. of 2.4 to 25 mm.sup.2/s and a ratio (Mw/Mn) of a weight average molecular weight (Mw) and a number average molecular weight (Mn) of 1.3 to 13.