A lubricating oil composition prepared by blending a base oil (A) containing a compound (A1) that is an ester or ether and has two or more aromatic rings, with a polyalkylene glycol (B) is provided. The lubricating oil composition has a high density (i.e., a high bulk modulus), a high viscosity index, and excellent shear stability.

The present invention is toward a base oil or lubricant additives, methods of using the same, lubricant compositions including the same, and methods of forming the lubricant compositions. A base oil or lubricant additive has Structure I or Structure II as described herein.

The present invention is toward a base oil or lubricant additives, methods of using the same, lubricant compositions including the same, and methods of forming the lubricant compositions. A base oil or lubricant additive has Structure I or Structure II as described herein.

A refrigeration cycle apparatus including a refrigeration circuit, the refrigeration circuit including a compressor, an outdoor heat exchanger, an indoor heat exchanger, and an expansion valve, wherein a refrigerant is sealed within the refrigeration circuit, the refrigerant contains trifluoroiodomethane, the compressor is filled with a refrigerator oil, and the refrigerator oil contains at least one of a first compound represented by the following chemical formula 1 and a second compound represented by the following chemical formula 2:

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The present invention is toward a base oil or lubricant additives, methods of using the same, lubricant compositions including the same, and methods of forming the lubricant compositions. A base oil or lubricant additive has Structure I or Structure II as described herein.

A grease base oil, containing: condensation esters of alcohols (A) and carboxylic acids (B), wherein the alcohols (A) include a polyhydric alcohol represented by General Formula (1), the carboxylic acids (B) include a fatty acid having 5 to 9 carbon atoms (B-1), a branched fatty acid having 15 to 20 carbon atoms (B-2), a cycloalkane monocarboxylic acid having 4 to 8 carbon atoms (B-3), and an aromatic carboxylic acid (B-4), and the carboxylic acids (B) have a percentage of (B-1) above of 30 mol % to 50 mol %, a percentage of (B-2) above of 30 mol % to 50 mol %, a percentage of (B-3) above of 10 mol % to 30 mol %, and a percentage of (B-4) above of 1 mol % to 15 mol %. The grease base oil contains condensation esters having heat resistance and low temperature storageability.

A grease base oil, containing: condensation esters of alcohols (A) and carboxylic acids (B), wherein the alcohols (A) include a polyhydric alcohol represented by General Formula (1), the carboxylic acids (B) include a fatty acid having 5 to 9 carbon atoms (B-1), a branched fatty acid having 15 to 20 carbon atoms (B-2), a cycloalkane monocarboxylic acid having 4 to 8 carbon atoms (B-3), and an aromatic carboxylic acid (B-4), and the carboxylic acids (B) have a percentage of (B-1) above of 30 mol % to 50 mol %, a percentage of (B-2) above of 30 mol % to 50 mol %, a percentage of (B-3) above of 10 mol % to 30 mol %, and a percentage of (B-4) above of 1 mol % to 15 mol %. The grease base oil contains condensation esters having heat resistance and low temperature storageability.

Provided is a method of lubricating a sliding part by applying a lubricating base oil containing an ester compound to the sliding part. The ester compound contains a mixture of one or more compounds represented by a general formula (1) wherein R.sup.1 and R.sup.2 independently represent a hydrogen, a methyl, a benzoyloxy, a naphthoyloxy, or general formula (2) (—O—C(═O)—R.sup.5), R.sup.3 and R.sup.4 independently represent a benzoyloxy group, a naphthoyloxy group, or general formula (2), and R.sup.5 represents a linear C5-21 alkyl group, a branched chain C9-21 alkyl group, or a C5-21 cycloalkyl group that may also be substituted with an alkyl chain. The mixture contains a compound in which at least one among R.sup.1 to R.sup.4 is general formula (2), and the proportion, in the mixture, of a compound in which at least one among R.sup.1 to R.sup.4 is a benzoyloxy group or a naphthoyloxy group is 5-100 mole %.

Disclosed are metal cleaning formulations and methods of use. A formulation of the present teachings comprises one or more furoate esters such as ethyl 5-methyl-2-furoate and methyl 5-methyl-2-furoate. The formulations further comprise a base oil, which can be, for example, a naphthenic oil, a synthetic oil or a combination thereof. In some embodiments, a formulation can further comprise a metal protection additive and a lubrication additive. A variety of base oils, metal protection additives, and lubrication additives are suitable for use in the present teachings. Formulations of the present teachings are especially useful for the cleaning of metal products such as firearms. The cleaning power of a formulation of the instant teachings can exceed that required for US Military Specifications.

Provided is a grease containing a base oil and a hydrophilic nanofiber, the hydrophilic nanofiber having a thickness (d) of 0.01 to 500 nm being dispersed therein. The grease is low in an environmental load and excellent in safety on the human body and also has an appropriate worked penetration and has a high dropping point, and therefore, it is also excellent in heat resistance.