Lubricant oil additive compositions

C - Chemistry – Metallurgy – 10 – M

Patent

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C10M 141/12 (2006.01)

Patent

CA 2647574

A lubricant oil composition having a synergistic oxidative stability is disclosed, the composition comprising at least one hindered phenolic antioxidant, at least one mono-boronated hindered phenolic antioxidant, at least one di-boronated hindered phenolic antioxidant, at least one alkylated diphenylamine and at least one organomolybdenum compound. The invention also provides a lubricating oil additive concentrate composition that imparts synergistic oxidative stability to a lubricant oil upon its addition, the concentrate composition comprising at least one hindered phenolic antioxidant, at least one mono-boronated hindered phenolic antioxidant, at least one di-boronated hindered phenolic antioxidant, at least one alkylated diphenylamine and at least one organomolybdenum compound. Further, the concentrate compositions of the present invention may also be prepared with a high concentration of hindered phenolic antioxidants without deleterious effects on viscosity or lubricant solubility.

L'invention concerne une composition d'huile lubrifiante qui possède une stabilité oxydative synergétique. La composition de l'invention comprend au moins un antioxydant phénolique encombré, au moins un antioxydant phénolique encombré mono-boré, au moins un antioxydant phénolique encombré di-boré, au moins une diphénylamine alkylée et au moins un composé organomolybdène. L'invention se rapporte également à une composition concentrée d'additif pour huile lubrifiante qui permet de conférer une stabilité oxydative synergétique à une huile lubrifiante lorsqu'elle est ajoutée à cette dernière, la composition concentrée comprenant au moins au moins un antioxydant phénolique encombré, au moins un antioxydant phénolique encombré mono-boré, au moins un antioxydant phénolique encombré di-boré, au moins une diphénylamine alkylée et au moins un composé organomolybdène. La composition concentrée précitée peut en outre être préparée avec un pourcentage élevé d'antioxydants phénoliques encombrés sans effets néfastes sur la viscosité ni sur la solubilité du lubrifiant.

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