# US 8,465,665 B2 · Refrigerating-machine oil composition, and compressor for refrigerating machine and refrigerating apparatus each employing the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,465,665 B2 - Document ID: US8465665B2 - Status: Granted - Kind: B2 - Application number: 13/172,231 - Filed: 2011-06-29 - Published: 2011-10-20 - Granted: 2013-06-18 - Earliest claimed: 2005-12-20 - Assignees: Idemitsu Kosan Co., Ltd. - Applicants: Masato Kaneko - Inventors: Masato Kaneko - Web page: https://patentgrep.com/patent/US8465665B2 ## CPC - C10M 171/008: {Lubricant compositions compatible with refrigerants} - C10M 2201/0413: used as base material - C10M 2201/0603: used as base material - C10M 2203/065: used as base material - C10M 2203/1006: used as base material - C10M 2203/1025: used as base material - C10M 2203/1065: used as base material - C10M 2205/003: used as base material - C10M 2205/0206: used as base material - C10M 2207/026: with tertiary alkyl groups - C10M 2207/042: Epoxides - C10M 2207/2835: used as base material - C10M 2209/043: used as base material - C10M 2209/1003: used as base material - C10M 2209/101: Condensation polymers of aldehydes or ketones and phenols, e.g. Also polyoxyalkylene ether derivatives thereof - C10M 2209/1013: used as base material - C10M 2209/1023: used as base material - C10M 2209/1033: used as base material - C10M 2209/1085: used as base material - C10M 2213/003: used as base material - C10M 2213/0623: used as base material - C10M 2217/041: involving a condensation reaction - C10M 2217/044: Polyamides - C10M 2217/0443: used as base material - C10M 2221/04: Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds - C10M 2221/0405: used as base material - C10M 2223/02: having no phosphorus-to-carbon bonds - C10M 2229/02: Unspecified siloxanes; Silicones - C10N 2020/02: Viscosity; Viscosity index - C10N 2020/101: {Containing Hydrofluorocarbons} - C10N 2020/103: {Containing Hydrocarbons} - C10N 2020/105: {Containing Ammonia} - C10N 2020/106: {Containing Carbon dioxide} - C10N 2030/04: Detergent property or dispersant property - C10N 2030/06: Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure - C10N 2040/02: Bearings - C10N 2040/30: Refrigerators lubricants {or compressors lubricants} - C10N 2050/02: dissolved or suspended in a carrier which subsequently evaporates to leave a lubricant coating - C10N 2050/14: {Composite materials or sliding materials in which lubricants are integrally molded} - C10M: LUBRICATING COMPOSITIONS (well drilling compositions C09K8/02); USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION (mould release, i.e. separating, agents for metals B22C3/00, for plastics or substances in a plastic state, in general B29C33/56, for glass C03B40/02; textile lubricating compositions D06M11/00, D06M13/00, D06M15/00; immersion oils for microscopy G02B21/33) - C10N: INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS ## 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. ## Claims ### Claim 1 A refrigerator oil composition, comprising: a base oil which is at least one member selected from a polyalkylene glycol, a polyvinyl ether, a polyvinyl ether-polyalkylene glycol copolymer and a polyol ester; and at least one polyamide compound having two or more amide groups in the molecule selected from the group consisting of a saturated fatty acid bisamide, an unsaturated fatty acid bisamide and an aromatic bisamide, wherein the saturated fatty acid bisamide is selected from the group consisting of methylenebislauramide, methylenebisstearamide, methylenebishydroxystearamide, ethylenebiscaprylamide, ethylenebiscapramide, ethylenebislauramide, ethylenebisstearamide, ethylenebisisostearamide, ethylenebishydroxystearamide, ethylenebisbehenamide, hexamethylenebisstearamide, hexamethylenebisbehenamide, hexamethylenebishydroxystearamide, butylenebishydroxystearamide, a condensation product of caprylic acid with diethylenetriamine (molar ratio 3:1), a condensation product of lauric acid with triethylenetriamine (molar ratio 4:1), a condensation product of propanoic acid with tridecaethylenetetradecamine (molar ratio 11:1) and a condensation product of isostearic acid with tetraethylenepentamine; and a % by mass of the at least one polyamide compound is from 0.01 to 5% by mass based on the total amount of the refrigerator oil composition. ### Claim 2 (depends on 1) The refrigerator oil composition according to claim 1, wherein the at least one polyamide compound is an unsaturated fatty acid bisamide, and the unsaturated fatty acid bisamide is selected from the group consisting of methylenebisoleamide, ethylenebisoleamide, ethylenebiserucamide, hexamethylenebisoleamide, N,N′-dioleyladipamide, N,N′-dioleylsebacamide and a condensation product of oleic acid with triethylenetriamine in a molar ratio of 3 moles oleic acid to 1 mole triethylenetriamine. ### Claim 3 (depends on 1) The refrigerator oil composition as defined in claim 1, wherein a kinematic viscosity of the base oil is 2 to 500 mm2/s at 40° C. ### Claim 4 (depends on 1) The refrigerator oil composition according to claim 1, wherein the at least one polyamide compound is an aromatic bisamide, and the aromatic bisamide is selected from the group consisting of m-xylylenebisstearamide and N,N′-distearylisophthalamide. ### Claim 5 (depends on 1) The refrigerator oil composition as defined in claim 1, further comprising a phosphorus acid ester. ### Claim 6 (depends on 1) The refrigerator oil composition as defined in claim 1, further comprising at least one member selected from an antioxidant and an acid scavenger. ### Claim 7 (depends on 1) A compressor for a refrigerator comprising: a refrigerator oil composition according to claim 1; a refrigerant; and a compression mechanism section comprising a coated aluminum or iron sliding part; wherein the coating of the sliding part is a lubricating film comprising: a binder which is a resin containing nitrogen atoms, oxygen atoms and/or sulfur atoms, and at least one member selected from the group consisting of molybdenum disulfide, a fluorine-containing resin, graphite and carbon black. ### Claim 8 (depends on 7) The compressor for a refrigerator as defined in claim 7, wherein the refrigerant is selected from the group consisting of carbon dioxide, a hydrofluorocarbon, a hydrocarbon and ammonia. ### Claim 9 (depends on 7) The compressor for a refrigerator as defined in claim 7, wherein the compression mechanism comprises at least one operation mechanism selected from the group consisting of a scroll mechanism, a rotary mechanism, a swing mechanism and a piston mechanism. ### Claim 10 (depends on 8) A refrigeration apparatus system, comprising: the compressor according to claim 8; a radiator; an expansion mechanism; and an evaporator; wherein a kinematic viscosity of the base oil at 40° C. is from 2 to 500 mm2/s, and the binder is at least one resin selected from the group consisting of a polyamide, a polyamideimide, a polyimide, a polybenzoazole, a polyphenylene sulfide and a polyacetal. ### Claim 11 (depends on 1) The refrigerator oil composition according to claim 1, wherein the refrigerator oil composition contacts and ensures a lubricity of a coated sliding part, the sliding part comprises at least one of aluminum and iron, and the coating is a lubricating organic film or a lubricating inorganic film. ### Claim 12 (depends on 11) The refrigerator oil according to claim 11, wherein the refrigerator oil composition contacts a lubricating organic film and the organic film comprises: a binder resin having at least one of nitrogen atoms, oxygen atoms and sulfur atoms, and at least one member selected from the group consisting of molybdenum disulfide, a fluorine-containing resin, graphite and carbon black. ### Claim 13 (depends on 12) The refrigerator oil according to claim 12, wherein a heat distortion temperature of the bonder resin is 100° C. or greater. ### Claim 14 (depends on 10) The refrigeration apparatus system according to claim 10, wherein a moisture content of the system is not greater than 300 ppm. ### Claim 15 (depends on 10) The refrigeration apparatus system according to claim 10, wherein a residual air content of the system is not greater than 50 ppm. ### Claim 16 (depends on 1) The refrigerator oil composition according to claim 1, wherein the at least one polyamide compound is the saturated fatty acid bisamide.