Gear fluids
US7410935B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 22, 2006 |
| Grant date | Aug 12, 2008 |
| Priority date | — |
| Expiry date | Mar 7, 2027 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10N2040/045
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
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 R1 is a hydrocarbyl group containing from about 8 to about 24 carbon atoms, R2 and R3 are selected from a hydrocarbyl group containing from about 1 to about 8 carbon atoms, an alkyl phosphonic acid monoester of the formulawherein R4 is a hydrocarbyl group containing from about 8 to about 24 carbon atoms, R5 is 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 R6 and R8 is a hydrocarbyl group, and R7 is hydrogen or a hydrocarbyl group, and wherein the ratio of (i) to (ii) ranges from about 3 to about 5.5.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.