| abstract |
The present invention provides a lubricating oil or a lubricating oil additive, particularly suitable for a R-134a (1,1,1,2-tetrafluoroethane) or R-134 (1,1,2,2-tetrafluoroethane) refrigerant, consisting of a compound (X) that can be prepared by esterification of a polyoxyethoxylated glycerol with at least one polycarboxylic acid compound having from 2 to 20 carbon atoms, preferably from 4 to 13 carbon atoms, and at least one monocarboxylic acid compound having from 2 to 20 carbon atoms, preferably from 6 to 13 carbon atoms. |