Refrigerating machine oil composition

Abstract

The refrigerating machine oil composition of the present invention is a refrigerating machine oil composition comprising an alicyclic dicarboxylic acid ester compound containing an alicyclic ring and two ester groups represented by the following general formula (1): —COOR1  (1) where R1 represents a hydrocarbon group of 1-30 carbons, the two ester groups bonded to mutually adjacent carbon atoms on the alicyclic ring, wherein the molar ratio of cis-forms and trans-forms for the orientation of the two ester groups of the alicyclic dicarboxylic acid ester compound is from 20/80 to 80/20. When used together with HFC refrigerants and natural refrigerants such as carbon dioxide and hydrocarbons, it can yield a refrigerant machine oil composition with excellent lubricity, miscibility with refrigerants, heat and hydrolytic stability and electric insulating property, which can also provide high efficiency to refrigeration systems.

Dependencies are inferred from the claim text.