| abstract |
This lubricating oil additive contains a monoester carboxylate (A) represented by formula (1) [in formula (1), R1 represents a single bond in which carbon atoms of carbonyl groups are bonded together or represents a divalent hydrocarbon group having 1-4 carbon atoms, R2 represents a hydrocarbon group having 1-22 carbon atoms, AO represents a single oxyalkylene group that is one group selected from among oxyalkylene groups having 2-4 carbon atoms or represents mixed oxyalkylene groups that are two or more groups selected from among oxyalkylene groups having 2-4 carbon atoms, n represents 0-5 and indicates the average number of moles added of the oxyalkylene groups represented by AO, and M represents an organic ammonium]. |