Abstract: A lubricant composition is disclosed which can largely reduce abrasion, can exhibit a low friction coefficient steadily, and has a high corrosion resistance in the lubrication of an iron-based sliding member. The lubricant composition includes a lubricant base oil, a 3,4,5-trihydroxybenzoic acid ester in an amount of 0.01 to 10 mass % relative to the total amount of the lubricant composition, and a detergent dispersant in an amount of 0.1 to 20 mass % relative to the total amount of the lubricant composition.

Abstract: A process oil comprising a 95/5 to 5/95 by weight mixture of: an extract having a DMSO extractable content less than 3 wt % obtained by solvent-extracting an oil obtained by deasphalting a vacuum distillation bottom; and either a mineral oil base having a DMSO extractable content less than 3 wt % which is a raffinate obtained by the solvent refining of a vacuum distillate or a mineral oil base having a DMSO extractable content less than 3 wt % obtained by subjecting a raffinate obtained by the solvent refining of a vacuum distillate to hydrorefining and/or dewaxing. The process oil has a kinematic viscosity at 100° C. of less than 32 mm2/s, % CA of 15 to 30, aniline point of 100° C. or lower, weight change through evaporation of 0.5% or less, and mutagenicity index of less than 1.

Abstract: A process oil comprising a 95/5 to 5/95 by weight mixture of: an extract having a DMSO extractable content less than 3 wt % obtained by solvent-extracting an oil obtained by deasphalting a vacuum distillation bottom; and either a mineral oil base having a DMSO extractable content less than 3 wt % which is a raffinate obtained by the solvent refining of a vacuum distillate or a mineral oil base having a DMSO extractable content less than 3 wt % obtained by subjecting a raffinate obtained by the solvent refining of a vacuum distillate to hydrorefining and/or dewaxing. The process oil has a kinematic viscosity at lOOoC of less than 32 mm2/s, % CA of 15 to 30, aniline point of lOOoC or lower, weight change through evaporation of 0.5% or less, and mutagenicity index of less than 1.

Abstract: Disclosed is a rubber process oil in which the content of polycyclic aromatics (PCAs) as determined by the IP 346 method is less than 3% by mass and which is rich in aromatic hydrocarbons, and a method for producing the same. The aniline point of the rubber process oil is 80° C. or less, and the % CA value as determined by ring analysis according to the Kurtz method is from 20 to 50%. The rubber process oil is produced by using extraction of lube oil fraction with a solvent having a selective affinity for aromatics. The extraction conditions are determined so that the extraction yield is regulated to a predetermined requirement defined by the PCAs content of the lube oil fraction. Alternatively, the extract is cooled to further separate into the extract and the raffinate, and the second raffinate is used for the rubber process oil.

Abstract: A lubricant for a refrigerator using ammonia as the refrigerant, which contains an additive selected from antioxidant, anti-wear additive and metal deactivator, and the polyether compound represented by the following general formula (1) or (2): X{—O—(AO)n—H}p??(1) X{—O—(AO1)a—(AO2)b—H}p??(2)

Abstract: To provide a refrigerating unit using ammonia as a refrigerant, which uses a lubricant that is excellent in the compatibility with an ammonia refrigerant as well as in the lubricity and the stability.

Abstract: The present invention provides a lubricant for a compression type refrigeration system using ammonia as a refrigerant, which comprises polyether compounds and aromatic amine compounds or phenothiazine compounds, and preferably further comprises alcohol compounds such as polyhydric alcohol partial ether and/or benzotriazole compounds. Further, the present invention provides a working fluid composition comprising the lubricant and an ammonia refrigerant, and a refrigeration system which is filled with the working fluid composition. The lubricant has not only good compatibility with ammonia, but excellent stability and lubricating property, and therefore can suitably used in a compression type refrigeration system using an ammonia refrigerant that does not have the possibility of ozone layer depletion and global warming phenomenon.

Abstract: To provide a lubricant which is excellent in the compatibility with ammonia and also has excellent practical performance such as good stability and lubricity.

Abstract: To provide a refrigerating unit using ammonia as a refrigerant, which uses a lubricant that is excellent in the compatibility with an ammonia refrigerant as well as in the lubricity and the stability.

Abstract: The present invention relates to a refrigeration oil for a refrigerating machine using Flon as a refrigerant. In particular, the present invention relates to a lubricating oil composition for a refrigerating machine using hydrofluorocarbon (HFC) containing no chlorine as a refrigerant, also relates to a working fluid and a refrigerating machine.

Abstract: To provide a polyalkylene glycol-based refrigerant oil for refrigerators using ammonia as a refrigerant.

Abstract: Disclosed is a rubber process oil in which the content of polycyclic aromatics (PCAs) as determined by the IP 346 method is less than 3% by mass and which is rich in aromatic hydrocarbons, and a method for producing the same. The aniline point of the rubber process oil is 80° C. or less, and the %CA value as determined by ring analysis according to the Kurtz method is from 20 to 50%. The rubber process oil is produced by using extraction of lube oil fraction with a solvent having a selective affinity for aromatics. The extraction conditions are determined so that the extraction yield is regulated to a predetermined requirement defined by the PCAs content of the lube oil fraction. Alternatively, the extract is cooled to further separate into the extract and the raffinate, and the second raffinate is used for the rubber process oil.

Abstract: Disclosed is a rubber process oil in which the content of polycyclic aromatics (PCAs) as determined by the IP 346 method is less than 3% by mass and which is rich In aromatic hydrocarbons, and a method for producing the same. The aniline point of the rubber process oil is 80° C. or less, and the % CA value as determined by ring analysis according to the Kurtz method is from 20 to 50%. The rubber process oil is produced by using extraction of lube oil fraction with a solvent having a selective affinity for aromatics. The extraction conditions are determined so that the extraction yield is regulated to a predetermined requirement defined by the PCAs content of the lube oil fraction. Alternatively, the extract is cooled to further separate into the extract and the raffinate, and the second raffinate is used for the rubber process oil.

Abstract: This invention provides a refrigerator oil, a working fluid for a refrigerator, and a method for lubricating a refrigeration system, which can inhibit the creation of deposits attributable to metal working oils remaining within a refrigeration system. The refrigerator oil contains: a polyhydric alcohol ester compound as a lube base oil, and 0.5 to 4.5% by weight of at least one polyoxyalkylene compound. The working fluid for a refrigerator, containing: the above refrigerator oil, and a hydrofluorocarbon refrigerant. A method for lubricating a refrigeration system contaminated with metal working oils, containing a component sparingly soluble in the polyhydric alcohol ester compound or the hydrofluorocarbon refrigerant, or metal working oils, containing a component highly reactive with the polyhydric alcohol ester compound or the hydrofluorocarbon refrigerant, remaining therein, wherein the above working fluid for a refrigerator is used as a working fluid.

Abstract: A lubricating oil additive contains a partially etherified polyhydric alcohol which has at least two hydroxyl groups and at least one hydrocarbon group having a least one double bond bonded thereto through an ether linkage as an active component. The lubricating additive is added to a lube base oil to form a lubricating oil which imparts excellent wear resistance, scarcely corrodes metallic substances, scarcely swells rubbers or resins and scarcely forms sludge due to thermal oxidation. The lubricating oil is mixed with a refrigerant to give a working fluid suitable for refrigerant compressors of domestic refrigerators, automotive room air conditioners, refrigerators for industrial use and air conditioners.

Abstract: A lubricating oil for a fluorinated hydrocarbon-based refrigerant type compressor, said lubricating oil having a kinematic viscosity at 100.degree. C. being 15 to 30 cSt and comprising, as a base oil, at least one polyoxyalkylene glycol derivative represented by the following formula (I):R.sub.1 --O--?(PO)p(EO.sup.1)q!--(EO.sup.2)r--R.sub.2 (I)in which R.sub.1 is an alkyl group having 1 to 4 carbon atoms, R.sub.2 is a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, PO is an oxypropylene group, EO.sup.1 and EO.sup.2 are oxyethylene groups, p, q and r are average polymerization degrees of PO, EO.sup.1 and EO.sup.2, respectively, ?(PO)p(EO.sup.1)q! is a random copolymer group of PO and EO.sup.1, (EO.sup.2)r is a block polymer group of EO.sup.2, p/(p+q) is 0.70 to 0.95, and r/(p+q+r) is 0.03 to 0.30. A lubricating method and a working fluid composition for the fluorinated hydrocarbon-based refrigerant type compressor are also disclosed.

Abstract: The present invention provides a working fluid composition for a refrigerating machine obtained by mixing an ammonia refrigerant with a lubricating oil which is extremely excellent in solubility with the ammonia refrigerant, and a method for lubricating a refrigerating machine suitable for the use of the working fluid composition.The working fluid composition comprises a mixture of ammonia and one or more kinds of polyether compounds represented by the formula (I); the refrigerating machine is characterized by constituting a refrigerating cycle or a heat pump cycle through which the working fluid composition is circulated; and the method for lubricating a refrigerating compressor is characterized by lubricating the ammonia refrigerant compressor with the lubricating oil comprising one or more kinds of ether compounds represented by the formula (I)R.sub.1 --?--O--(PO).sub.m --(EO).sub.n --R.sub.2 !.sub.x (I)wherein R.sub.1 is a hydrocarbon group having 1 to 6 carbon atoms, R.sub.

Abstract: The present invention provides a working fluid composition for a refrigerating machine obtained by mixing an ammonia refrigerant with a lubricating oil which is extremely excellent in solubility with the ammonia refrigerant. The working fluid composition comprises a mixture of ammonia and one or more kinds of polyether compounds; the refrigerating machine is characterized by constituting a refrigerating cycle or a heat pump cycle through which the working fluid composition is circulated.

Abstract: A working fluid composition for a compression type refrigerator, comprising:(A) a refrigerant composed of ammonia or at least one hydrofluorocarbon having the number of carbon being not more than 2 and containing no chlorine; and(B) a lubricant for the refrigerator, said lubricant comprising 100 parts by weight of a synthetic oil and 0.5 to 10.0 parts by weight of at least one benzotriazole derivative expressed by the following formula (I). ##STR1## in which R.sup.1 is hydrogen or an alkyl group having the number of carbons being 1-10, and R.sup.2 and R.sup.3 independently indicate an alkyl group having the number of carbons being 4-18.

Abstract: A lubricating oil for flon compressor includes, as a main ingredient, a compound represented by a formula (I):R.sub.1 --[--O--(R.sub.2 O).sub.y --(CH.sub.2 CH.sub.2 O).sub.z --H].sub.x (I)in which R.sub.1 denotes a hydrocarbon residue derived from a C.sub.1-8 alcohol having a valence of 1 to 4, R.sub.2 denotes a C.sub.3-4 branched alkylene group, x denotes an integer of 1-4, and y and z each independently denote a positive number, R.sub.2 O units and CH.sub.2 CH.sub.2 O units are block copolymerized in an order shown in the formula (I), z/(y+z) is more than 0 but not more than 0.3. The lubricating oil has a kinetic viscosity of 2-30 cSt at 100.degree. C. A mixture of the oil having the formula (I) with a lubricating oil having a formula (II): R.sub.3 --[--O--(R.sub.4 O).sub.m --(CH.sub.2 CH.sub.2 O).sub.n --R.sub.5 ].sub.l may be also used. In the formula (II), R.sub.3 denotes a hydrocarbon residue derived from a CI-s alcohol having one to four hydroxyl groups, R.sub.4 denotes a C.sub.