| abstract |
(57) [Abstract] [Purpose] A synthesis which has a polyalkylene glycol carbonate having a specific structure as a main component, has excellent compatibility with hydrogen-containing CFCs such as HFC-134a, and has excellent hydrolysis stability. Provides lubricating oil. [Structure] General formula [In the formula, A represents an alkylene group having 2 to 4 carbon atoms, X 1 , X 2 , X 3 and X 4 may be the same or different and each is a hydrogen atom, a hydrocarbon group having 1 to 8 carbon atoms or a group represented by the general formula —CO—O—R. And R represents an alkyl group having 1 to 8 carbon atoms; l, m And n are 0 to 30, respectively, and l + m + n = 5 to 5 0, m + n = 1 to 50 are integers; X 1 , X 2 , X At least one of 3 and X 4 has the general formula —CO—O. A synthetic lubricating oil containing a polyalkylene glycol-based carbonic acid ester represented by -R. |