Patent ID: 6261474
Filing Date: 2001-07-17
Classification: C10M,C10N

Abstract:
A lubricating oil for compression-type refrigerators comprising (1) a mixed hydrofluorocarbon refrigerant consisting of 20 to 80% by weight of pentafluoroethane and 80 to 20% by weight of at least one refrigerant selected from the group consisting of difluoromethane, 1,1,1-trifluoroethane and 1,1,1,2-tetrafluoroethane and (2) a polyvinyl ether compound having (a) a constituting unit represented by the following general formula (I): ##STR14##wherein R represents a hydrocarbon group which has 1 to 3 carbon atoms and may have ether bond in the group, or a polyvinyl ether compound having constituting unit (a) and (b) a constituting unit represented by the following general formula (I'): ##STR15##wherein R' represents a hydrocarbon group which has 3 to 20 carbon atoms, may have ether bond in the group, and is different from the hydrocarbon group represented by R in general formula (I), as the main component of the lubricating oil,wherein the ratio in mol of constituting unit (a) and constituting unit (b) in the polyvinyl ether compound is in the range of 10:0 to 5:5.