Abstract: In a reaction in which a boron trifluoride complex is used as a catalyst, the expensive and harmful boron trifluoride complex is separated from a reaction mixture containing the boron trifluoride complex by separating the boron trifluoride complex present in the reaction mixture by using a saturated hydrocarbon-based solvent.

Abstract: A lubricating oil composition of the invention contains longifolene represented by the following formula (1), that is, (1S,3aR,4S,8aS)-4,8,8-trimethyl-9-methylene-decahydro-1,4-methanoazulene.

Abstract: In a reaction in which a boron trifluoride complex is used as a catalyst, the expensive and harmful boron trifluoride complex is separated from a reaction mixture containing the boron trifluoride complex by separating the boron trifluoride complex present in the reaction mixture by using a saturated hydrocarbon-based solvent.

Abstract: A lubricating oil composition contains a base oil containing a compound (A) and a compound (B) below and a compound (C). The lubricating oil composition exhibits a kinematic viscosity at 40 degrees C. in a range of 20 mm2/s to 40 mm2/s, a density at 15 degrees C. of 1.1 g/cm3 or more, a flash point of 200 degrees C. or more, and a viscosity index of 100 or more. The compound (A) is an ester or an ether having two or more aromatic rings. The compound (B) is an ester or an ether having a kinematic viscosity at 40 degrees C. of 12 mm2/s or less, a density at 15 degrees C. of 0.9 g/cm3 or more and a flash point of 100 degrees C. or more. The compound (C) is a poly(meth)acrylate having a mass average molecular weight of 50000 or less.

Abstract: The present invention provides a lubricating oil composition having an extremely high viscosity index and a low coefficient of traction as a low coefficient of fluid friction in an elastohydrodynamic lubrication which is excellent in saving of energy and reduction in fuel consumption. The lubricating oil composition according to the present invention includes the following components (A) and (B): (A) a low-viscosity synthetic oil comprising a compound containing ether bond(s) in a molecule thereof and having a kinematic viscosity of less than 10 mm2/s as measured at 40° C., in which a ratio of the number of oxygen atoms to the number of carbon atoms as constituents of the compound (O/C ratio) and the kinematic viscosity (mm2/s) of the compound as measured at 40° C. satisfy the following formula (1); Kinematic Viscosity at 40° C.?12?[(O/C ratio)×30] (1); and (B) a high-viscosity synthetic oil as a hydrocarbon-based synthetic oil having a kinematic viscosity of 40 mm2/s or more as measured at 100° C.

Abstract: A pressure transmission medium contains an ester or an ether having two or more ring structures of an aromatic ring or a saturated naphthenic ring as a pressure transmission medium base oil. The pressure transmission medium that exhibits low energy loss due to compression, excellent response in a hydraulic circuit, energy-saving, high-speed operation and high precision of control in a hydraulic circuit, a low viscosity and a low churning resistance, and a hydraulic device can be provided.

Abstract: A lubricating oil composition of the invention contains longifolene represented by the following formula (1), that is, (1S,3aR,4S,8aS)-4,8,8-trimethyl-9-methylene-decahydro-1,4-methanoazulene.

Abstract: Provided is a lubricating oil for continuously variable transmissions characterized by that used as a base oil are a synthetic oil I having the following properties: (a) a traction coefficient at 120° C. is 115% or more of that of 2,4-dicyclohexyl-2-methylpentane, (b) a viscosity at ?40° C. is not higher than a viscosity (260 Pa·s) of 2,4-dicyclohexyl-2-methylpentane, and (c) a viscosity index is 65 or higher, and a synthetic oil II having a viscosity of 1 Pa·s or lower at ?40° C. and that the above base oil has a specific property. The above lubricating oil is a lubricating oil for continuously variable transmissions which has a high traction coefficient even at high temperature and is endowed with a good low temperature fluidity and which is suited as a lubricating oil for continuously variable transmissions for automobiles.

Abstract: A device-cooling base oil includes 30 mass % of at least one of an oleyl ester (e.g., oleate and oleyl alcohol ester) and oleyl ether. The oleyl ester and the oleyl ether each have 23 or more of a total number of a terminal methyl group, a methylene group and an ether group in a main chain and 1 or less of a total number of a methyl branch and an ethyl branch. The base oil has a kinematic viscosity at 40 degrees C. in a range of 4 mm2/s to 30 mm2/s. A device-cooling oil provided by blending the base oil is excellent in electrical insulation properties and thermal conductivity, and thus is favorably usable for cooling a motor, a battery, an inverter, an engine, an electric cell or the like in an electric vehicle, a hybrid vehicle or the like.

Abstract: A hydraulic fluid of the present invention contains, as a base oil, an ester having two or more ring structures, the two or more ring structures being at least one selected from an aromatic ring and a saturated naphthenic ring. Particularly, the hydraulic fluid contains an ester having two or more aromatic rings as the base oil. The hydraulic fluid has low energy loss due to compression and exhibits excellent responsiveness when being used in a hydraulic circuit. Consequently, the hydraulic fluid realizes energy-saving, high-speed operation and high precision of control in the hydraulic circuit.

Abstract: Provided is a method of ultrasound diagnosis, wherein the method includes: coating a surface of a specimen with a transmission medium; and performing the ultrasound diagnosis, wherein the transmission medium has a viscosity of at least 1,000 mPa·s at 25° C. and contains a hydrocarbon compound.

Abstract: A base oil for cooling a device contains a hydrocarbon compound at 30 mass % or more and exhibits a kinematic viscosity of 4 mm2/s to 30 mm2/s at 40 degrees C. The total number of a terminal methyl group(s) and a methylene group(s) in a main chain of the hydrocarbon compound is 16 or more. The total number of a methyl branch and an ethyl branch in the molecule is one or less. A device-cooling oil provided by blending the base oil is excellent in electrical insulation properties and thermal conductivity, and thus is favorably usable for cooling a motor, a battery, an inverter, an engine, an electric cell or the like in an electric vehicle, a hybrid vehicle or the like.

Abstract: The present invention provides a lubricating oil composition for a compression type refrigerator, containing a base oil having a kinematic viscosity of 2 to 1,000 mm2/s at 40° C. The base oil contains the following compounds (1) to (6) each having a molecular weight of 150 to 5,000 and a tertiary or quaternary carbon: (1) an alicyclic hydrocarbon, (2) a branched carboxylic acid ester of a polyhydric alcohol, (3) an alicyclic polycarboxylic acid ester, (4) polybutene, (5) an alkyl benzene and/or an alkyl naphthalene, and (6) a paraffinic mineral oil showing a 13C-NMR spectrum in which an area of peaks at chemical shifts in the range of 30 to 100 ppm accounts for 5 to 40% of the entire peak area and/or a naphthenic mineral oil having a naphthene content of 30 to 70% by mass. The composition has excellent traction performance, lubricating properties and stability.

Abstract: Provided is a method of ultrasound diagnosis, wherein the method includes: coating a surface of a specimen with a transmission medium; and performing the ultrasound diagnosis, wherein the transmission medium has a viscosity of at least 1,000 mPa·s at 25° C. and contains a hydrocarbon compound.

Abstract: A lube base oil which comprises at least one hydrocarbon compound having as the basic skeleton a structure represented by any of the general formulae (I) to (VI) and has a viscosity at ?40° C. of 40 Pa·s or lower and a viscosity index of 80 or higher, (wherein p is an integer of 1 to 10, provided that in the formulae (I) and (II), p is not 1). It satisfies the coefficient of high-temperature traction, low-temperature flowability, and viscosity index on a high level.

Abstract: A traction drive fluid composition which comprises component (A) a base oil for traction drives bearing at least one selected from a quaternary carbon atom or an alicyclic structure in the molecule and component (B) at least one polymer having a weight average molecular weight in the range of 8,000 to 40,000 and which is selected from among (a) hydrocarbon polymers each containing as a constituent at least 10 mole % of a monomer bearing a cyclic structure, (b) hydrocarbon polymers each containing at least 25% of quaternary carbon atoms in the backbone chain, and (c) hydrogenated products from the polymers (a) and (b). The traction drive fluid composition is improved in viscosity index without lowering the traction coefficient to a level lower than that of the base oil and is excellent in shear stability.

Abstract: A pressure transmission medium contains an ester or an ether having two or more ring structures of an aromatic ring or a saturated naphthenic ring as a pressure transmission medium base oil. The pressure transmission medium that exhibits low energy loss due to compression, excellent response in a hydraulic circuit, energy-saving, high-speed operation and high precision of control in a hydraulic circuit, a low viscosity and a low churning resistance, and a hydraulic device can be provided.

Abstract: The present invention provides a lubricating oil composition for a compression type refrigerator, containing a base oil having a kinematic viscosity of 2 to 1,000 mm2/s at 40° C. The base oil contains the following compounds (1) to (6) each having a molecular weight of 150 to 5,000 and a tertiary or quaternary carbon: (1) an alicyclic hydrocarbon, (2) a branched carboxylic acid ester of a polyhydric alcohol, (3) an alicyclic polycarboxylic acid ester, (4) polybutene, (5) an alkyl benzene and/or an alkyl naphthalene, and (6) a paraffinic mineral oil showing a 13C-NMR spectrum in which an area of peaks at chemical shifts in the range of 30 to 100 ppm accounts for 5 to 40% of the entire peak area and/or a naphthenic mineral oil having a naphthene content of 30 to 70% by mass. The composition has excellent traction performance, lubricating properties and stability.

Abstract: Provided is a lubricating oil for continuously variable transmissions characterized by that used as a base oil are a synthetic oil I having the following properties: (a) a traction coefficient at 120° C. is 115% or more of that of 2,4-dicyclohexyl-2-methylpentane, (b) a viscosity at ?40° C. is not higher than a viscosity (260 Pa·s) of 2,4-dicyclohexyl-2-methylpentane and (c) a viscosity index is 65 or higher and a synthetic oil II having a viscosity of 1 Pa·s or lower at ?40° C. and that the above base oil has a specific property. The above lubricating oil is a lubricating oil for continuously variable transmissions which has a high traction coefficient even at high temperature and is endowed with a good low temperature fluidity and which is suited as a lubricating oil for continuously variable transmissions for automobiles.

Abstract: A hydraulic fluid of the present invention contains, as a base oil, an ester having two or more ring structures, the two or more ring structures being at least one selected from an aromatic ring and a saturated naphthenic ring. Particularly, the hydraulic fluid contains an ester having two or more aromatic rings as the base oil. The hydraulic fluid has low energy loss due to compression and exhibits excellent responsiveness when being used in a hydraulic circuit. Consequently, the hydraulic fluid realizes energy-saving, high-speed operation and high precision of control in the hydraulic circuit.