Patent ID: 8299006

Claim:
A compressor oil composition comprising: a lubricating base oil having % C A of not more than 2, % C p /% C N of not less than 6, % C N of 7 to 13, a sulfur content of not more than 100 ppm by mass, and an iodine value of not more than 2.5, wherein the content of the saturated components in the lubricating base oil is not less than 95% by mass based on the total amount of the lubricating base oil and wherein the ratio M A /M B of the mass of monocyclic saturated components M A to the mass of bi- or more cyclic saturated components M B in the saturated cyclic components is not more than 3; and at least one antioxidant selected from amine antioxidants, phenolic antioxidants and organometallic antioxidants; and at least one mist suppressant selected from polymer compounds containing, as constituting monomers, an alkyl acrylate having 1 to 18 carbon atoms, an alkyl methacrylate having 1 to 18 carbon atoms, an olefin having 2 to 20 carbon atoms, styrene, methylstyrene, maleic anhydride and a mixture of two or more thereof, wherein the weight-average molecular weight of mist suppressant is 5,000 to 100,000.