REFRIGERATING MACHINE OIL COMPOSITION

摘要

PROBLEM TO BE SOLVED: To provide a refrigerating machine oil composition satisfying in good balance all of lubricity, refrigerant compatibility, stability to heat/hydrolysis and electrical insulation when used together with an HFC refrigerant and a natural refrigerant such as carbon dioxide or hydrocarbon. SOLUTION: This refrigerating machine oil composition is characterized by containing an alicyclic polycarboxylic ester compound obtained using (a) such an alicyclic polycarboxylic acid or a derivative thereof as to have an alicyclic ring and two or more carboxy groups which are respectively bound to carbon atoms adjacent to each other on the alicyclic ring, (b) a compound or a derivative thereof having two or more hydroxy groups, and (c) a compound or a derivative thereof having one hydroxy group.