LUBRICATING OIL COMPOSITION

摘要

A lubricating oil composition characterized by containing a phosphorus compound having two or more hydroxyl groups and a P-N linkage in the molecule; a composition for refrigerator working fluids comprising the above composition and a hydrofluorocarbon; and a lubricating oil additive for polar oils containing the above phosphorus compound as an active ingredient. The above composition is excellent in lubricity and compatibility with hydrofluorocarbons and does not cause corrosion of metals even when it comprises a highly polar base oil, thus making it possible to provide a composition for refrigerator working fluids.