Abstract: A process to lubricate a refrigerator preferably having a sliding portion which is made of an engineering plastic material, or provided thereon with an organic coating film or an inorganic coating film is provided. The process includes contacting sliding parts of the refrigerator with a refrigerating machine oil composition having a base oil containing a polyvinyl ether and/or a polyoxyalkylene glycol derivative as a main component and having a kinematic viscosity of 1 to 8 mm2/s as measured at 40° C. The refrigerating machine oil composition has a low viscosity, an improved energy saving performance, a good sealability and an excellent compatibility with a refrigerant and, therefore, the process can be suitably used in various refrigerating application fields, in particular, in closed-system refrigerators.

Abstract: Disclosed is a refrigerator oil composition containing a base oil (A) composed of a polyvinyl ether, an organic sulfur compound (B) having a sulfur content of not more than 35% by mass and a refrigerant (C), in which a total sulfur content is 0.01 to 0.1% by mass with respect to a total amount of the components (A) and (B). Such the novel refrigerator oil composition does not cause environmental problems such as ozone layer destruction and global warming, and can retain the lubrication properties for a long period of time, while preventing a capillary in a refrigeration cycle from clogging.

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 composition for a refrigerator which uses a base oil including as the main component at least one kind of oxygen-containing compounds selected from polyoxyalkylene glycols, polyvinyl ethers, copolymers of poly(oxy)alkylene glycols or monoethers thereof and polyvinyl ethers, polyol esters, and polycarbonates. The lubricating oil composition for a refrigerator is used for a refrigerator that uses, as a refrigerant, a fluorine-containing organic compound, which is a refrigerant applicable to current car air conditioner systems or the like and has a specific polar structure, and has favorable sealing property, a low coefficient of friction factor in a sliding part, and excellent stability as well as excellent compatibility with the refrigerant.

Abstract: The present invention provides a refrigerator oil composition comprising a base oil which is at least one member selected from mineral oils and synthetic oils, and at least one imide compound, said imide compound in an amount of 0.01 to 5% by mass based on the total amount of the refrigerator oil composition, and also provides a compressor and a refrigeration apparatus using the refrigerator oil composition. The refrigerator oil composition and the compressor and the refrigeration apparatus using the refrigerator oil composition satisfy both sludge dispersibility and prevention of wear and seizing of a sliding part made of aluminum and/or iron.

Abstract: Provided is a refrigerating machine oil which contains a base oil mainly containing at least one substance selected from the group consisting of a mineral oil, a synthetic alicyclic hydrocarbon compound, and a synthetic aromatic hydrocarbon compound and having a kinematic viscosity at 40° C. of 1 to 8 mm2/s. The refrigerating machine oil is applied to refrigerators including a sliding part formed of an engineering plastic or including an organic coating film or an inorganic coating film. The refrigerating machine oil enables to improve energy-saving performance due to its low viscosity, has a low frictional coefficient and good sealing property, and is suitably used in various refrigeration applications, especially in closed-type refrigerators.

Abstract: There is provided a refrigerating machine oil composition which has a low viscosity, an improved energy saving performance, a good sealability and an excellent loading endurance and, therefore, can be suitably used in various refrigerating application fields, in particular, in closed-system refrigerators. The refrigerating machine oil composition of the present invention comprises a base oil containing a hydrogenated ?-olefin oligomer as a main component and having a kinematic viscosity of 1 to 8 mm2/s as measured at 40° C., and is preferably applied to refrigerators having a sliding portion which is made of an engineering plastic material, or provided thereon with an organic coating film or an inorganic coating film.

Abstract: A refrigerator oil composition includes: a synthetic base oil; and a partial hydrocarbyl ether of an aliphatic polyhydric alcohol condensate, in which the aliphatic polyhydric alcohol condensate includes a condensate of 4 to 20 molecules of a hindered glycol and/or an aliphatic polyhydric alcohol having 3 to 6 hydroxyl groups. The refrigerator oil composition is preferably used in a compression refrigerator that uses a hydrofluorocarbon, a natural refrigerant such as a hydrocarbon, carbon dioxide, or ammonia, a mixed refrigerant of fluoroiodomethane and propene, an unsaturated fluorinated hydrocarbon, a fluorinated ether, a fluorinated alcohol, a fluorinated ketone, or a mixture thereof as a refrigerant, has a low coefficient of friction, and is excellent in energy-saving property.

Abstract: Provided is a refrigerating machine oil which contains a base oil mainly containing at least one substance selected from the group consisting of a mineral oil, a synthetic alicyclic hydrocarbon compound, and a synthetic aromatic hydrocarbon compound and having a kinematic viscosity at 40° C. of 1 to 8 mm2/s. The refrigerating machine oil is applied to refrigerators including a sliding part formed of an engineering plastic or including an organic coating film or an inorganic coating film. The refrigerating machine oil enables to improve energy-saving performance due to its low viscosity, has a low frictional coefficient and good sealing property, and is suitably used in various refrigeration applications, especially in closed-type refrigerators.

Abstract: The present invention provides a refrigerator oil composition which satisfies both sludge dispersibility and prevention of wear and seizing of sliding parts made of aluminum and/or iron, and a compressor and a refrigeration apparatus using the refrigerator oil composition. The refrigerator oil composition is characterized by comprising a base oil which is at least one member selected from mineral oils and synthetic oils, and at least one polyamide compound having two or more amide groups in the molecule and being present in an amount of 0.01 to 5% by mass based on the total amount of the refrigerator oil composition.

Abstract: The present invention provides a refrigerator oil composition which satisfies both sludge dispersibility and prevention of wear and seizing of sliding parts made of aluminum and/or iron, and a compressor and a refrigeration apparatus using the refrigerator oil composition. The refrigerator oil composition is characterized by comprising a base oil which is at least one member selected from mineral oils and synthetic oils, and at least one polyamide compound having two or more amide groups in the molecule and being present in an amount of 0.01 to 5% by mass based on the total amount of the refrigerator oil composition.

Abstract: Disclosed is a refrigerator oil composition for use with carbon dioxide refrigerant, characterized in that the composition dissolves in an amount of at least 0.1% by mass in a supercritical carbon dioxide at a temperature of 100° C. under a pressure of 15 Mpa. The invention provides a refrigerator oil composition for carbon dioxide refrigerant which composition is employed in a refrigerating system operated in a supercritical state of carbon dioxide refrigerant and, particularly, such a composition which can enhance heat-exchange efficiency during passage of supercritical carbon dioxide through a heat exchanger as well as which has excellent durability and lubrication performance.

Abstract: Provided is a refrigerating machine oil composition including a base oil which contains at least one substance selected from the group consisting of monoether compounds, alkyleneglycol diethers, and polyoxyalkyleneglycol diethers having an average repetition number of an oxyalkylene group of 2 or less as a main component, and has a kinematic viscosity at 40° C. of 1 to 8 mm2/s. The refrigerating machine oil composition is preferably applied to refrigerators whose sliding parts are composed of an engineering plastic or provided with an organic coating film or an inorganic coating film. The refrigerating machine oil can improve energy-saving performance due to its low viscosity, has high sealing property and excellent load capacity, and is suitably used in various refrigeration applications, especially in closed-type refrigerators.

Abstract: A process to lubricate a refrigerator preferably having a sliding portion which is made of an engineering plastic material, or provided thereon with an organic coating film or an inorganic coating film is provided. The process includes contacting sliding parts of the refrigerator with a refrigerating machine oil composition having a base oil containing a polyvinyl ether and/or a polyoxyalkylene glycol derivative as a main component and having a kinematic viscosity of 1 to 8 mm2/s as measured at 40° C. The refrigerating machine oil composition has a low viscosity, an improved energy saving performance, a good sealability and an excellent compatibility with a refrigerant and, therefore, the process can be suitably used in various refrigerating application fields, in particular, in closed-system refrigerators.

Abstract: The present invention provides lubricating oil for a compression refrigerator, characterized by including an alkylene glycol or polyoxy alkylene glycol unit and a vinyl ether unit in a molecule and containing a polyvinyl ether compound having a molecular weight of 300 to 3,000. The lubricating oil for a compression refrigerator has a high viscosity index and excellent compatibility under a natural refrigerant atmosphere such as carbon dioxide.

Abstract: The refrigerating machine oil composition of the invention is characterized by containing a mixed base oil which has a kinematic viscosity at 40° C. of 0.11 to 8 mm2/s and which is composed of a low-viscosity base oil (A) having a kinematic viscosity at 40° C. of 5 mm2/s or lower, and a high-viscosity base oil (B) having a kinematic viscosity at 40° C. of 20 to 400 mm2/s, each of the base oil (A) and (B) being composed of at least one species selected from among a mineral oil, a synthetic hydrocarbon compound, an oxygen-containing compound, and a sulfur-containing compound. The refrigerating machine oil composition exhibits enhanced energy saving performance by virtue of its low viscosity, has excellent sealing performance and load resistance, and can be employed in various refrigeration means, particularly suitably in a closed-type refrigerator.

Abstract: Provided is a lubricating oil composition for a refrigerator, the refrigerator using a refrigerant which has a low global warming potential and is applicable to, in particular, current car air conditioning systems or the like, that is, the refrigerant including at least one kind of fluorine-containing organic compounds selected from compounds represented by the following molecular formula (A) or including a combination of the fluorine-containing organic compound and a saturated fluorinated hydrocarbon compound, CpOqFrRs??(A) where: R represents Cl, Br, I, or H; p represents an integer of 1 to 6, q represents an integer of 0 to 2, r represents an integer of 1 to 14, and s represents an integer of 0 to 13; and provided that, when q represents 0, p represents 2 to 6 and one or more carbon-carbon unsaturated bonds are included in molecules, in which a base oil contained in the composition includes as a main component a polyvinyl ether derivative having a hydroxyl value of 17 mgKOH/g or less.

Abstract: Provided is a lubricating oil composition for a refrigerator, the refrigerator using a refrigerant which has a low global warming potential and is applicable to, in particular, current car air conditioning systems or the like, that is, the refrigerant including at least one kind of fluorine-containing organic compounds selected from compounds represented by the following molecular formula (A) or including a combination of the fluorine-containing organic compound and a saturated fluorinated hydrocarbon compound, CpOqFrRs??(A) where: R represents Cl, Br, I, or H; p represents an integer of 1 to 6, q represents an integer of 0 to 2, r represents an integer of 1 to 14, and s represents an integer of 0 to 13; and provided that, when q represents 0, p represents 2 to 6 and one or more carbon-carbon unsaturated bonds are included in molecules, in which the composition comprises a base oil including as a main component a polyvinyl ether-based compound having an alkylene glycol unit, or a polyoxyalkylene glycol uni

Abstract: Provided is a lubricant composition for a refrigerator having the following characteristics: the composition being used for a refrigerator using a refrigerant having a specific structure such as an unsaturated fluorinated hydrocarbon compound serving as a refrigerant having a low global warming potential and usable particularly in current air-conditioning system for cars; the composition having excellent stability as well as excellent compatibility with the refrigerant; the composition including a base oil containing a polyoxyalkylene glycol derivative as a main component and 1 to 20% by mass of a monoepoxy compound based on the total amount of the composition; and the refrigerator using a refrigerant containing at least one kind of fluorine-containing organic compound selected from compounds represented by the molecular formula (A) CpOqFrRs or including a combination of the fluorine-containing organic compound and a saturated fluorinated hydrocarbon compound.

Abstract: A lubricating oil composition for refrigerator is provided by adding base oil with biphenols selected from 4,4?-methylenebis(2,6-di-t-butyl-phenol), 2?2-methylenebis(4-methyl-6-t-butylphenol), 2,2?-methylenebis(4-ethyl-6-t-butylphenol) and 4,4?-butylidenebis(3-methyl-6-t-butylphenol).