Gear fluids

Details Gear fluids Gear fluids

2006-03-22

2008-08-12

Griffin, Walter D. (Department: 1797)

Solid anti-friction devices, materials therefor, lubricant or se

Lubricants or separants for moving solid surfaces and...

Organic phosphorus compound

Reexamination Certificate

active

07410935

ABSTRACT:
A gear fluid composition for extreme pressure applications. The composition includes a base oil component and a friction modifier mixture. The mixture is provided by an alkyl phosphonic acid diester of the formula:wherein R1is a hydrocarbyl group containing from about 8 to about 24 carbon atoms, R2and R3are selected from a hydrocarbyl group containing from about 1 to about 8 carbon atoms, an alkyl phosphonic acid monoester of the formulawherein R4is a hydrocarbyl group containing from about 8 to about 24 carbon atoms, R5is hydrogen or hydrocarbyl group containing from about 1 to about 8 carbon atoms, and an amine salt of a partial ester of phosphoric acid represented by the formulawherein each of R6and R8is a hydrocarbyl group, and R7is hydrogen or a hydrocarbyl group, and wherein the ratio of (i) to (ii) ranges from about 3 to about 5.5.

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