JP2009149892A5 - - Google Patents

Claims (15)

A lubricating oil composition comprising the following ingredients:
a) at least one oil of lubricating viscosity;
b) an oil-soluble antioxidant according to the following formula I;

(Wherein R ₁ , R ₂ , R ₃ and R ₄ are each independently selected from the group of alkyl groups having 1 to 20 carbon atoms), and c) selected from antioxidants, dispersants and detergents At least one additive.   The lubricating oil composition according to claim 1, wherein the at least one additive is an antioxidant. The lubricating oil composition according to claim 2, wherein the antioxidant is a mixture containing the following components:
a) 0.1 to 10% by weight of a first antioxidant according to the following formula I

Wherein R ₁ , R ₂ , R ₃ and R ₄ are each independently selected from the group of alkyl groups having 1 to 20 carbon atoms, and b) from the following formula of 0.01 to 10% by mass A second antioxidant chosen,

Wherein R ^a and R ^b are each independently aryl having 6 to 10 carbon atoms, and aryl is unsubstituted or substituted with 1 or 2 alkyl groups each having 1 to 20 carbon atoms May be).   4. The lubricating oil composition according to claim 3, wherein the ratio of component a) to component b) is from 0.75: 1 to 5: 1.   The lubricating oil composition according to claim 2, wherein the total weight percent of the mixture of antioxidants in the composition is less than 5 weight percent. The lubricating oil composition according to claim ₁ , wherein R ₁ , R ₂ , R ₃ and R ₄ are each independently selected from the group of alkyl groups having 1 to 10 carbon atoms.   4. A lubricating oil composition according to claim 3, wherein component b) is selected from the group consisting of diphenylamine, monoalkylated diphenylamine, dialkylated diphenylamine, trialkylated diphenylamine and mixtures thereof.   Component b) is selected from the group consisting of butyldiphenylamine, di-butyldiphenylamine, octyldiphenylamine, di-octyldiphenylamine, nonyldiphenylamine, di-nonyldiphenylamine, t-butyl-t-octyldiphenylamine and mixtures thereof. The lubricating oil composition described in 1.   The lubricating oil composition of claim 2, wherein component b) is selected from the group consisting of phenyl-alpha-naphthylamine, phenyl-beta-naphthylamine, t-octylated N-phenyl-1-naphthylamine.   The lubricating oil composition according to claim 2, wherein the at least one antioxidant is a hindered phenol-based antioxidant.   The lubricating oil composition according to claim 1, further comprising an oil-soluble molybdenum compound.   The oil-soluble molybdenum compound comprises (i) an acidic molybdenum compound and a succinimide, a carboxylic acid amide, a hydrocarbon monoamine, a phosphoramide, a thiophosphoramide, a Mannich base, a dispersion type viscosity index improver, or a mixture thereof. The non-sulfurized or sulfurized oxymolybdenum-containing composition produced by reacting a basic nitrogen compound selected from the group in the presence of a polar accelerator to form an oxymolybdenum complex. Lubricating oil composition.   The composition according to claim 12, wherein the basic nitrogen compound is succinimide.   Further, oil-soluble phosphorus-containing wear resistance selected from the group consisting of metal dithiophosphates, phosphorus esters, amine phosphate esters and amine phosphinic acid esters, sulfur-containing phosphorus esters, phosphoramides and phosphonamides The composition of claim 2 comprising a compound. A method for improving the antioxidant performance of a lubricating oil containing an amine-based or phenol-based antioxidant, which is improved by supplying an oil-soluble antioxidant according to the following formula I to the lubricating oil:

(Wherein R ₁ , R ₂ , R ₃ and R ₄ are each independently selected from the group of alkyl groups having 1 to 20 carbon atoms).