Synergistic antioxidant systems
AssigneeExxon Chemical Patents Inc.
InventorsRaymond Frederick Watts, Ricardo Alfredo Bloch
Life of this patent
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Abstract
The invention provides synergistic combinations of phosphorus acid-containing compounds with ashless antioxidants. These combinations dramatically improve the oxidation stability of lubricating compositions, particularly power transmission fluids such as automatic transmission fluids.
Claims11
A lubricating oil composition comprising a major amount of a tolyltriazole and boron containing lubricating oil and an oxidation-resistant effective amount of a synergistic additive combination of:
- (A) phosphoric acid;
- and
- (B) di-nonyl-diphenylamine.
A lubricating oil composition comprising:
- (1) a major amount of a lubricating oil having approximately an 80 neutral number;
- (2) a succinimide dispersant;
- (3) tolyltriazole;
- (4) amide and ethoxylated amine friction modifiers;
- (5) a viscosity modifier;
- (6) an antifoamant;
- and
- (7) an oxidation-resistant effective amount of a synergistic additive combination of
- (A) phosphoric acid, and
- (B) di-nonyl-diphenylamine.
A lubricating oil composition consisting essentially of:
- (1) a major amount of a lubricating oil having approximately an 80 neutral number;
- (2) a succinimide dispersant;
- (3) tolyltriazole;
- (4) amide and ethoxylated amine friction modifiers;
- (5) a viscosity modifier;
- (6) an antifoamant;
- and
- (7) an oxidation-resistant effective amount of a synergistic additive combination of
- (A) phosphoric acid, and
- (B) di-nonyl-diphenylamine.
A lubricating oil composition consisting essentially of:
- (1) a major amount of a lubricating oil having approximately an 80 neutral number;
- (2) a succinimide dispersant;
- (3) tolyltriazole;
- (4) amide and ethoxylated amine friction modifiers;
- (5) a viscosity modifier;
- (6) an antifoamant;
- (7) boron;
- and
- (8) an oxidation-resistant effective amount of a synergistic additive combination of
- (A) phosphoric acid, and
- (B) di-nonyl-diphenylamine.
Dependencies are inferred from the claim text.