| abstract |
(57) [Summary] [PROBLEMS] To provide a method for producing a bonded phosphorus amide-containing precursor, a precursor thereof, a lubricant concentrate, and a lubricant composition containing the same for use in lubrication of an internal combustion engine, a hydraulic system and the like. [Structure] A method for producing a lubricant composition including the following steps: an acid (A) having the following formula: Reacting with a compound (B) having the formula: Obtaining a reaction product formed by the reaction of (A) and (B); reacting the reaction product of (A) and (B) with a linking compound R 8 , after reaction with R 8. Obtaining the formed reaction product and adding it to an oil with the necessary viscosity for lubrication. |