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

摘要

A refrigerator oil composition which contains: at least one ester additive that is selected from among tetraesters of pentaerythritol and one fatty acid selected from among fatty acids having 5-18 carbon atoms and hexaesters of dipentaerythritol and one fatty acid selected from among fatty acids having 5-18 carbon atoms; and a base oil that is an ester other than the ester additive. The content of the ester additive is 2-20% by mass based on the total mass of the refrigerator oil composition; and the kinematic viscosity of the refrigerator oil composition at 40°C is 3-500 mm/s.