| abstract |
Provided is a novel additive composition containing (a)na compound having, in the molecule, a group of a general formulan(I):n n wherein R 1 , R 2 and R 3 each represent a hydrogen atom orna methyl group, but at least one of R 2 and R 3 is a hydrogennatom, nand (b) an extreme-pressure improver containing sulfur and/ornphosphorus, and optionally, as an additional component (c), annextreme-pressure improver containing neither sulfur nornphosphorus. Lubricating oil compositions comprising thenadditive composition have high load carrying capacity, and areneffectively used as metal working oils and hydraulic oils, suchnas forging oil, pressing oil, drawing oil, rolling oil, cuttingnoil, grinding oil, etc. |