REFRIGERATOR OIL COMPOSITION, METHOD FOR PRODUCING SAME, AND WORKING FLUID COMPOSITION FOR REFRIGERATORS

摘要

A refrigerating machine oil composition comprising at least one ester additive selected from tetraesters of pentaerythritol and one selected from fatty acids having 5 to 18 carbon atoms and hexaesters of dipentaerythritol and one selected from fatty acids having 5 to 18 carbon atoms, and a base oil that is an ester other than the ester additive, in which the content of the ester additive is 2 to 20 mass% based on the total amount of the refrigerating machine oil composition, and the kinematic viscosity of the refrigerating machine oil composition at 40°C is 3 to 500 mm 2 /s.