| abstract |
Disclosed is a refrigerator oil composition characterized by containing a synthetic base oil and a partial hydrocarbyl ether of an aliphatic polyhydric alcohol condensate. This refrigerator oil composition is also characterized in that the aliphatic polyhydric alcohol condensate is a hindered glycol and/or a 4-20 molecule condensate of an aliphatic polyhydric alcohol having 3-6 hydroxy groups. This refrigerator oil composition is preferably used for compression type refrigerating machines wherein a hydrofluorocarbon, a natural refrigerant such as a hydrocarbon, carbon dioxide or ammonia, a mixed refrigerant of fluorinated methyl iodide and propene, or an unsaturated fluorinated hydrocarbon, a fluorinated ether, a fluorinated alcohol, a fluorinated ketone or one of their mixtures is used as a refrigerant. |