| abstract |
(57) Abstract: A phosphoric acid derivative useful as an additive capable of imparting excellent extreme pressure properties, abrasion resistance, friction characteristics, fatigue life resistance, and the like to a lubricating oil, and a lubricating oil containing the same. To provide additives for SOLUTION: In phosphorus nuclear magnetic resonance spectrometry, 10 Has an absorption at about -5 ppm, and has a -5 to -5 ppm and / or -20 to -2 in boron nuclear magnetic resonance spectrometry. A boron-containing phosphoric acid derivative having an absorption of 5 ppm each; and a lubricating oil additive containing the same. |