Aqueous compositions containing thiophosphorus esters or their salts with a oxyalkylene group, and methods of using the same
AssigneeThe Lubrizol Corporation
InventorsNaresh Chand Mathur, Edward J. Konzman
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Abstract
This invention relates to an aqueous composition comprising water, a surfactant or thickener, 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 hydrocarbyl terminated oxyalkylene group, at least one hydrocarbyl terminated polyoxyalkylene group, or a mixture thereof. The aqueous compositions have improved antiwear/extreme pressure properties and improved antioxidation properties. In these compositions, the thiophosphorus acid esters and their salts act as antiwear agents and rust inhibitors.
Claims26
An aqueous composition comprising water, a dispersant/solubilizer or a nonionic surfactant, 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 hydrocarbyl terminated polyoxyalkylene group, the hydrocarbyl moiety of the hydrocarbyl terminated polyoxyalkylene group containing about 6 to about 30 carbon atoms, the oxyalkylene moiety of the hydrocarbyl terminated polyoxyalkylene group containing about 2 to about 8 carbon atoms, and the hydrocarbyl terminated polyoxyalkylene group containing about 2 to about 40 oxyalkylene moieties.
An aqueous composition comprising water, a dispersant/solubilizer or a nonionic surfactant and at least one amine salt of at least one metal-free monothiophosphorus acid ester containing at least one hydrocarbyl terminated polyoxyalkylene group, the hydrocarbyl moiety of the hydrocarbyl terminated polyoxyalkylene group containing about 6 to about 30 carbon atoms, the oxyalkylene moiety of the hydrocarbyl terminated polyoxyalkylene group containing about 2 to about 8 carbon atoms, and the hydrocarbyl terminated polyoxyalkylene group containing about 2 to about 40 oxyalkylene moieties.
An aqueous composition comprising water, a dispersant/solubilizer or a nonionic surfactant, and at least one metal-free thiophosphorus acid ester represented by the following formula
- wherein X1 and X3 are oxygen or sulfur, provided that at least one of X1 and X3 is sulfur;
- X2 is oxygen;
- R1 is a hydrocarbyl group of about 6 to about 30 carbon atoms;
- R2 is an alkylene group of about 2 to about 8 carbon atoms;
- R3 is a hydrogen or hydrocarbyl group;
- x is a number from about 2 to about 40;
- and a is 0, 1, or 2, or at least one salt of the thiophosphorus acid ester.
Dependencies are inferred from the claim text.