Abstract: The invention relates to a refrigerator oil composition for compression refrigerators with carbon dioxide refrigerant therein, such as car air conditioners, refrigerators, freezers, air conditioners, heat pumps, etc. The base oil of the composition comprises an oxygen-containing organic compound as the essential component and has a kinematic viscosity at 100° C. of from 5 to 50 mm2/sec, a viscosity index of at least 60, and a water content of at most 300 ppm.

Abstract: The present invention proposes a lubricating oil for refrigerators comprising, as the base oil, a polyester-based derivative or a polyvinyl ether derivative and a polycarbonate-based oxygenated compound; a polyoxyalkylene glycol derivative; or a polyester-based derivative or a polyvinyl ether derivative and a polyoxyalkylene glycol derivative. The lubricating oil exhibits excellent miscibility with a refrigerant having one carbon atom and no chlorine atoms and, in particular, with difluoromethane and provides a hydraulic fluid composition exhibiting excellent antiwear, lubricity and stability.

Abstract: This invention describes a refrigerating oil composition for natural substance-based refrigerants which comprises (A) a synthetic oil component comprising a polyether compound having a pour point of ?10° C. or lower and (B) a mineral oil component comprising sulfur components, wherein the ratio of amounts by weight of component (A) to component (B) is in the range of 25:75 to 99:1 and the amount of the sulfur components derived from component (B) in the composition is in the range of 5 to 1,000 ppm. The refrigerating oil composition has excellent miscibility with natural substance-based refrigerants and, in particular, with ammonia-based refrigerants, exhibits an improved lubricity and used for industrial refrigerators using natural substance-based refrigerants such as ammonia, propane, butane and carbon dioxide.

Abstract: The invention relates to a refrigerator oil composition for compression refrigerators with carbon dioxide refrigerant therein, such as car air conditioners, refrigerators, freezers, air conditioners, heat pumps, etc. The base oil of the composition comprises an oxygen-containing organic compound as the essential component and has a kinematic viscosity at 100° C. of from 5 to 50 mm2/sec, a viscosity index of at least 60, and a water content of at most 300 ppm.

Abstract: The invention relates to a refrigerator oil composition for compression refrigerators with carbon dioxide refrigerant therein, such as car air conditioners, refrigerators, freezers, air conditioners, heat pumps, etc. The base oil of the composition comprises an oxygen-containing organic compound as the essential component and has a kinematic viscosity at 100° C. of from 5 to 50 mm2/sec, a viscosity index of at least 60, and a water content of at most 300 ppm.

Abstract: This invention describes a refrigerating oil composition for natural substance-based refrigerants which comprises (A) a synthetic oil component comprising a polyether compound having a pour point of ?10° C. or lower and (B) a mineral oil component comprising sulfur components, wherein the ratio of amounts by weight of component (A) to component (B) is in the range of 25:75 to 99:1 and the amount of the sulfur components derived from component (B) in the composition is in the range of 5 to 1,000 ppm. The refrigerating oil composition has excellent miscibility with natural substance-based refrigerants and, in particular, with ammonia-based refrigerants, exhibits an improved lubricity and used for industrial refrigerators using natural substance-based refrigerants such as ammonia, propane, butane and carbon dioxide.

Abstract: This invention describes a refrigerating oil composition for natural substance-based refrigerants which comprises (A) a synthetic oil component comprising a polyether compound having a pour point of ?10° C. or lower and (B) a mineral oil component comprising sulfur components, wherein the ratio of amounts by weight of component (A) to component (B) is in the range of 25:75 to 99:1 and the amount of the sulfur components derived from component (B) in the composition is in the range of 5 to 1,000 ppm. The refrigerating oil composition has excellent miscibility with natural substance-based refrigerants and, in particular, with ammonia-based refrigerants, exhibits an improved lubricity and used for industrial refrigerators using natural substance-based refrigerants such as ammonia, propane, butane and carbon dioxide.

Abstract: A lubricating oil composition which comprises at least one compound selected from specific cyclic organic phosphorus compounds is disclosed. The lubricating oil composition exhibits excellent extreme pressure property, seizure resistance and wear resistance and is advantageously used as bearing oil, gear oil, hydraulic oil and refrigerator oil.

Abstract: A lubricating oil for refrigerators which comprises a compound having oxygen as a base oil and is miscible with a refrigerant having no chlorine atoms and one carbon atom at a temperature of −10° C. or lower when the lubricating oil is comprised at least in one content within the range of 3 to 50% by weight based on the entire amount of a mixture comprising the lubricating oil and the refrigerant; and a hydraulic fluid composition for refrigerators which comprises a refrigerant having no chlorine atoms and one carbon atom and the lubricating oil described above. The hydraulic fluid composition exhibits excellent miscibility of the lubricating oil with the above refrigerant and, in particular, with difluoromethane and also exhibits excellent antiwear, lubricity and stability.

Abstract: The present invention proposes a lubricating oil for refrigerators comprising, as the base oil, a polyester-based derivative or a polyvinyl ether derivative and a polycarbonate-based oxygenated compound; a polyoxyalkylene glycol derivative; or a polyester-based derivative or a polyvinyl ether derivative and a polyoxyalkylene glycol derivative. The lubricating oil exhibits excellent miscibility with a refrigerant having one carbon atom and no chlorine atoms and, in particular, with difluoromethane and provides a hydraulic fluid composition exhibiting excellent antiwear, lubricity and stability.

Abstract: The present invention describes a refrigerating oil composition for a carbon dioxide refrigerant comprising a base oil composition which comprises (A) a polyoxyalkylene glycol having a kinematic viscosity of 3 to 50 mm2/s at 100° C. and at least one component selected from (B) a carbonate-based carbonyl derivative having a kinematic viscosity of 3 to 50 mm2/s at 100° C. and (C) a polyol ester having a kinematic viscosity of 3 to 50 mm2/s at 100° C., wherein an amount of (B) and/or (C) is 0.1 to 40% by weight of the total base oil composition. The composition exhibits sufficient antiwear, excellent lubricity and miscibility with carbon dioxide refrigerants and can be used for a long time with stability in the refrigerating cycle using a refrigerant comprising carbon dioxide in the supercritical condition of a high temperature and a high pressure as the main component.

Abstract: The invention relates to a refrigerator oil composition for compression refrigerators with carbon dioxide refrigerant therein, such as car air conditioners, refrigerators, freezers, air conditioners, heat pumps, etc. The base oil of the composition comprises an oxygen-containing organic compound as the essential component and has a kinematic viscosity at 100° C. of from 5 to 50 mm2/sec, a viscosity index of at least 60, and a water content of at most 300 ppm.

Abstract: A refrigerating oil composition for a carbon dioxide refrigerant which comprises as a main component a mixture comprising (A) a polyvinyl ether having a kinematic viscosity of 3 to 50 mm2/s at 100° C. in an amount exceeding 40% by weight and of 99.1% by weight or less and (B) a polyoxyalkylene glycol having a kinematic viscosity of 3 to 50 mm2/s at 100° C. in an amount of 0.1% by weight or more and less than 40% by weight. The composition exhibits an excellent lubricating property and a great viscosity index even when a carbon dioxide refrigerant is used. The composition exhibits excellent stability and an excellent lubricating property under the atmosphere of carbon dioxide in the supercritical condition while the above advantageous properties are maintained and can be used for a long period of time.

Abstract: A lubricating oil composition which comprises at least one compound selected from specific cyclic organic phosphorus compounds is disclosed.

Abstract: This invention describes a refrigerating oil composition for natural substance-based refrigerants which comprises (A) a synthetic oil component comprising a polyether compound having a pour point of −10° C. or lower and (B) a mineral oil component comprising sulfur components, wherein the ratio of amounts by weight of component (A) to component (B) is in the range of 25:75 to 99:1 and the amount of the sulfur components derived from component (B) in the composition is in the range of 5 to 1,000 ppm. The refrigerating oil composition has excellent miscibility with natural substance-based refrigerants and, in particular, with ammonia-based refrigerants, exhibits an improved lubricity and used for industrial refrigerators using natural substance-based refrigerants such as ammonia, propane, butane and carbon dioxide.

Abstract: The present invention describes a refrigerating oil composition for a carbon dioxide refrigerant comprising a base oil composition which comprises (A) a polyoxyalkylene glycol having a kinematic viscosity of 3 to 50 mm2/s at 100° C. and at least one component selected from (B) a carbonate-based carbonyl derivative having a kinematic viscosity of 3 to 50 mm2/s at 100° C. and (C) a polyol ester having a kinematic viscosity of 3 to 50 mm2/s at 100° C., wherein an amount of (B) and/or (C) is 0.1 to 40% by weight of the total base oil composition. The composition exhibits sufficient antiwear, excellent lubricity and miscibility with carbon dioxide refrigerants and can be used for a long time with stability in the refrigerating cycle using a refrigerant comprising carbon dioxide in the supercritical condition of a high temperature and a high pressure as the main component.

Abstract: Provided is a refrigerator oil composition comprising a refrigerant that comprises carbon dioxide (CO2) as the essential component, and an ester-based lubricating oil composition; wherein the ratio of refrigerant/lubricating oil composition falls between 99/1 and 10/90 by weight. The refrigerator oil composition has good lubricity and sealability and can be stably used for a long period of time in a compression refrigeration cycle in which is used a refrigerant comprising CO2 as the essential component. Also provided is a method of using the composition for lubricating a compression refrigeration cycle equipped with an oil separator and/or a hot gas line.

Abstract: A refrigerating oil composition which exhibits excellent lubrication properties when used in combination with certain types of coolant, such as a hydrofluorocarbon coolant, which may serve as substitutes for chlorofluorocarbon coolants which have been implicated as causing environmental problems. The refrigerating oil composition of the present invention is obtained by incorporating, into a component (A); i.e., a base oil containing a synthetic oil, a component (B); i.e, a polyalkylene glycol derivative of formula (I) having a number average molecular weight of 200-3,000: R1—(OR2)m—(OR3)n—OR4  (I) wherein R1 and R4 represent C1-C30 hydrocarbon groups, etc.; R2 represents a C2-C4 alkylene group; R3 represents a C2-C30 alkylene group; m and n are numbers that satisfy the above-described molecular weight conditions, wherein n may be 0; and at least one of R1, R3, and R4 has a hydrocarbon group having six or more carbon atoms.

Abstract: Provided is a refrigerator oil, especially that for carbon dioxide refrigerant, which comprises a base oil comprising an oxygen-containing organic compound as the essential component and having a kinematic viscosity at 100° C. of from 5 to 50 mm2/sec and a viscosity index of at least 60, and optionally contains additives of, for example, extreme pressure agent and acid scavenger. The refrigerator oil can be used in compression refrigerators with carbon dioxide refrigerant therein, concretely in refrigerating or heating-cooling equipment such as car air conditioners, refrigerators, freezers, air conditioners, heat pumps, compression refrigeration cycles equipped with oil separator and/or hot gas line, etc. This is stable and has excellent lubricity (abrasion resistance) even in a supercritical carbon dioxide atmosphere, and therefore can be used for a long period of time in the atmosphere.

Abstract: Provided is a refrigerator oil composition comprising a refrigerant that comprises carbon dioxide (CO2) as the essential component, and an ester-based lubricating oil composition; wherein the ratio of refrigerant/lubricating oil composition falls between 99/1 and 10/90 by weight. The refrigerator oil composition has good lubricity and sealability and can be stably used for a long period of time in a compression refrigeration cycle in which is used a refrigerant comprising CO2 as the essential component. Also provided is a method of using the composition for lubricating a compression refrigeration cycle equipped with an oil separator and/or a hot gas line.