The Lubrizol Corporation

John V Stoffa

Craig D Tipton

Reed H Walsh

Richard E Gapinski

Frederick L Bayles, Jr

A functional fluid composition having improved gear performance comprises an oil of lubricating viscosity, and added thereto

Borated overbased sulfonates for improved gear performance in functional

A functional fluid is disclosed which comprises

Functional fluid with triglycerides, detergent-inhibitor additives and

A multipurpose functional fluid is disclosed which is comprised of a major amount of a hydrocarbon oil and a minor amount, sufficient to improve characteristics of the fluid of a novel additive. The additive is comprised of a calcium salt complex, a group II metal dithiophosphate salt, a borated epoxide, a carboxylic solubilizer and a sulfurized composition. The calcium salt is preferably in the form of an overbased calcium sulfonate salt, the antiwear agent is preferably in the form of a zinc dithiophosphate salt, the borated epoxide is preferably the reaction product of boric acid and a 16 carbon 1,2 epoxide, the carboxylic solubilizer is preferably in the form of a reaction product of an acylating agent containing a substituted hydrocarbyl-based substituent containing about 12 to 500 carbon atoms; and the sulfurized composition is in the form of a cosulfurized mixture of 2 or more reactants selected from the group consisting of at least one fatty acid ester of a polyhydric alcohol, at least one olefin and at least one fatty acid. Other components such as viscosity improvers and antifoaming agent are generally present in the fluid.

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North Olmsted, OH, United States of America

John V Stoffa