Oblon, Fisher, Spivak, McClelland & Maier
Lubricating oil compositions
 A lubricating oil composition containing esters constituted with glycerol, fatty acid and boric acid, which esters having carboxylic acid residue, glycerol residue and boric acid residue at a specific proportion. The proportion for the carboxylic acid residue and glycerol residue ranges 0-2.0 mols and 1.5-2.0 mols respectively per unit mol of a boric acid residue, and the glycerol residue is 1.2 mols or more based on 1 mol of the carboxylic acid residue. Lubricating oil additives according to the invention have almost no corrosion property in bearing portions, and do not form any solid film on themselves when allowed to stand in the air. 
Karonite Chemical Co., Ltd.
C
C10M
inventional
Morikuni Akihiro Tatsuro Takaharu
Nakazato Mochizuki Tsuneno Nakano