The present disclosure relates to a lubricant composition comprising a lubricant, a first ionic liquid which is soluble in polyalphaolefin and a second ionic liquid which is insoluble in polyalphaolefin. By using the two different ionic liquids, the technical properties of the lubricant compositions can be improved.

An object of the present invention is to provide a lubricating oil composition for hydraulic actuation which has excellent safety and which is imparted with electrical conductivity in order to prevent the generation of noise that adversely affects devices including hydraulic circuits equipped with an electronic control device for the valve system. The composition uses a hydrocarbon base oil, and the base oil contains from 30 to 250 ppm of ultrabasic magnesium salicylate in terms of magnesium content relative to the total amount of the composition, and from 0.07 to 5.0 mass % of non-dispersible polymethacrylate having a weight-average molecular weight of from 5,000 to 200,000 as a net amount relative to the total amount of the composition. The conductivity of the composition at 25 C. is 200 pS/m or more, the flash point is 240 C. or more, the pour point is negative 40 C. or less, and the coefficient of friction at 140 C. by a microclutch is 0.08 or more. This lubricating oil composition can be imparted with conductivity in order to prevent the generation of noise that adversely affects electronic controls when used in machinery equipped with electronic control devices.

The present invention relates to an electric discharge machining oil composition and an electric discharge machining method capable of enhancing machining speed in electric discharge machining. This electric discharge machining oil composition is characterized by including (A) a base oil, and (B) one or more types of petroleum resin selected from hydrogenated products of copolymers of dicyclopentadiene and an aromatic compound and having a softening point of 75 to 185 C. and a mean molecular weight (Mn) of 670 to 3000, wherein the kinematic viscosity of the electric discharge machining oil composition at 40 C. is 1 to 10 mm.sup.2/s. Further, the electric discharge machining method is characterized by employing said electric discharge machining oil composition, and includes interposing the electric discharge machining oil composition between a workpiece and an electrode, and generating an electric discharge between the workpiece and the electrode in this state to machine the workpiece.

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 hydrocarbon fluid is disclosed that has a pour point of at most 30 C., as measured by ASTM D5950, and that comprises at least 99 wt % of naphthenes and paraffins, based on the total weight of the hydrocarbon fluid, wherein the weight ratio of naphthenes to paraffins is at least 1, as measured by GC-MS, and wherein the paraffins consist essentially of isoparaffins, as determined by GC-FID. In addition, preferred uses of said hydrocarbon fluid are disclosed.

A transformer oil basestock is disclosed that includes at least 99 wt % of naphthenes and paraffins, based on the total weight of the transformer oil basestock, wherein the weight ratio of naphthenes to paraffins is at least 1, as measured by GC-MS, and wherein the paraffins consist essentially of isoparaffins, as determined by GC-FID. In addition, a transformer oil composition is disclosed that includes the transformer oil basestock, an anti-gassing agent and an antioxidant.

A composition whereby a hydrocarbon-based base oil is used and in this base oil are incorporated, in terms of the total amount of the composition, 30 to 300 ppm of overbased calcium salicylate and, in net weight in terms of the total amount of the composition, 0.07 to 2.0 mass % of a non-dispersant polymethacrylate having a weight average molecular weight of 5000 to 200,000. The electrical conductivity at 25 C. of this composition is not less than 200 pS/m, the flash point is not less than 240 C., the pour point is 40 C. or lower and the micro clutch friction coefficient at 140 C. is not less than 0.08. This lubricating oil composition may be used in machines fitted with electronic control apparatus and can impart conductivity so as to inhibit the occurrence of noise which is detrimental to electronic control.

An object of the present invention is to provide a lubricating oil composition for hydraulic actuation which has excellent safety and which is imparted with electrical conductivity in order to prevent the generation of noise that adversely affects devices including hydraulic circuits equipped with an electronic control device for the valve system. The composition uses a hydrocarbon base oil, and the base oil contains from 30 to 250 ppm of ultrabasic magnesium salicylate in terms of magnesium content relative to the total amount of the composition, and from 0.07 to 5.0 mass % of non-dispersible polymethacrylate having a weight-average molecular weight of from 5,000 to 200,000 as a net amount relative to the total amount of the composition. The conductivity of the composition at 25 C. is 200 pS/m or more, the flash point is 240 C. or more, the pour point is negative 40 C. or less, and the coefficient of friction at 140 C. by a microclutch is 0.08 or more. This lubricating oil composition can be imparted with conductivity in order to prevent the generation of noise that adversely affects electronic controls when used in machinery equipped with electronic control devices.

A composition whereby a hydrocarbon-based base oil is used and in this base oil are incorporated, in terms of the total amount of the composition, 30 to 300 ppm of overbased calcium salicylate and, in net weight in terms of the total amount of the composition, 0.07 to 2.0 mass % of a non-dispersant polymethacrylate having a weight average molecular weight of 5000 to 200,000. The electrical conductivity at 25 C. of this composition is not less than 200 pS/m, the flash point is not less than 240 C., the pour point is 40 C. or lower and the micro clutch friction coefficient at 140 C. is not less than 0.08. This lubricating oil composition may be used in machines fitted with electronic control apparatus and can impart conductivity so as to inhibit the occurrence of noise which is detrimental to electronic control.

A lubricant that enables to improve control stability of an automobile or the like having a vehicle body charged by driving. A lubricant for improving control stability of an automobile includes a base oil and an additive containing a carbon black. A kit for improving control stability of an automobile includes a discharging member including a protrusion that performs a self-discharging by air-ionizing and the lubricant. A method also improves control stability of an automobile.