Borated overbased sulfonates for improved gear performance in functional fluids
AssigneeThe Lubrizol Corporation
InventorsJohn V. Stoffa, Richard E. Gapinski
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Abstract
A functional fluid composition having improved gear performance comprises an oil of lubricating viscosity, and added thereto (a) an alkali or alkaline earth metal salt complex in the form of borated and/or non-borated salts; (b) an EP/antiwear agent comprising a mixture of zinc salts of dialkylphosphorodithioic acid and 2-ethylhexanoic acid heated with triphenyl phosphite or an olefin; and (c) a borated epoxide. The oil of lubricating viscosity has a kinematic viscosity of at least 4 cSt and 100.degree. C. and a -40.degree. C. Brookfield viscosity of less than 20,000.
Claims28
A functional fluid composition having improved low temperature and antiwear properties, said composition comprising:
- A. A major amount of an oil of lubricating viscosity;
- B. A minor amount of an additive package;
- said package comprising:
- (1) An alkali or alkaline earth metal salt complex, said complex selected from the group consisting of:
- (a) a borated metal salt complex;
- (b) a mixture or borated and non-borated metal salt complexes wherein said complex has a TBN of up to 800 on an oil free basis;
- (2) An EP/antiwear agent in the form of a zinc salt selected from the group consisting of
- (a) zinc salts of dialkylphosphorodithioic acid;
- and
- (b) a mixture of zinc salts of dialkylphosphorodithioic acid and zinc salts of carboxylic acids;
- (3) a borated epoxide;
- wherein said composition has a 100.degree. C. kinematic viscosity of at least 4cSt, a -40.degree. C. Brookfield viscosity maximum of 20,000 cP, and wherein said composition passes the JDQ95 Spiral Bevel Gear Test.
A functional composition having improved low temperature and antiwear properties, said composition comprising:
- A. A major amount of oil of lubricating viscosity;
- B. A minor amount of an additive package, said package comprising:
- (1) an alkali or alkaline earth metal salt complex, said complex selected from the group consisting of:
- (a) a borated metal salt complex;
- (b) a mixture of borated and non-borated metal salt complexes wherein said complex has a TBN of up to 800 on an oil free basis;
- (2) an EP/antiwear agent in the form of a mixture of zinc salts of a dialkylphosphorodithioic and alkyl carboxylic acids treated with triaryl phosphite or an olefin to reduce free sulfur;
- (3) a borated epoxide;
- (4) a carboxylic solubilizer in the form of an ester salt reaction product of an acylating agent containing a substituted hydrocarbyl-based substituent containing about 12 to about 500 carbon atoms and an alkanol tertiary monoamine;
- (5) a sulfurized compound, said sulfurized compound selected from the group consisting of:
- (a) sulfurized olefins;
- (b) sulfurized fatty acids;
- (c) sulfurized fatty acid esters of polyhydric alcohols;
- and mixtures thereof;
- wherein said composition has a 100.degree. C. kinematic viscosity of at least 4cSt, a -40.degree. C. Brookfield viscosity maximum of 20,000 cP, and wherein said composition passes the JDQ95 Spiral Bevel Gear Test.
Dependencies are inferred from the claim text.