PROCESS FOR PREPARING ADDITION AGENT, TO LUBRICATING OILS, AND LUBRICATING OIL Russian patent published in 1997 - IPC

FIELD: organic chemistry. SUBSTANCE: mixture comprising 60-90% alkaline metal alkyl salicilate and 10-40% alkyl phenol, wherein C₁₂-C₂₄-alkyl, is treated with alkaline metal hydroxide or oxide, and reaction mixture is then treated with elementary sulfur in the presence of promoter followed by purification of the final addition agent. After being treated with elementary sulfur, the reaction mixture may be carbonated with carbon dioxide in the presence of promoter. Lubricating oil contains base oil and 0.5-20% addition agent prepared by the process describes above. EFFECT: improved properties of the addition agent. 4 cl, 3 tbl