C - Chemistry – Metallurgy – 10 – M
Patent
C - Chemistry, Metallurgy
10
M
C10M 137/04 (2006.01) C10M 137/10 (2006.01) C10M 141/10 (2006.01) C10M 141/12 (2006.01) C10M 167/00 (2006.01) C10M 169/06 (2006.01)
Patent
CA 2178692
This invention relates to a lubricating composition comprising a major amount of an oil of lubricating viscosity and at least one metal-free thiophosphorus acid ester, at least one amine salt of the thiophosphorus acid ester, or a mixture thereof, wherein the thiophosphorus acid ester contains at least one hydrocarbylterminated oxyalkylene group, at least one hydrocarbyl terminated polyoxyalkylene group, or a mixture thereof. In one embodiment, the thiophosphorus acid ester is a thiophosphorus acid ester represented by the following formula Image wherein X1, X2, and X3 are oxygen or sulfur, provided that at least one of X1, X2, and X3 is sulfur; R1 is a hydrocarbyl group; R2 is an alkylene group; R3 is hydrogen or a hydrocarbyl group; x is a number from 1 to about 40; and a is 0, 1, or 2, or at least one salt of the thiophosphorus acid ester. The lubricating compositions, functional fluids and greases have improved antiwear/extreme pressure properties and improved antioxidation properties. In functional fluids, the thiophosphorus acid esters and their salts act as antiwear agents and rust inhibitors.
Galic Raguz Mary
Mathur Naresh C.
Ridout & Maybee Llp
The Lubrizol Corporation
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