Phosphite treatment of phosphorus acid salts and compositions produced thereby
AssigneeThe Lubrizol Corporation
InventorsDonald L. Clason, Calvin W. Schroeck
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Abstract
The properties of salts of dialkylphosphorodithioic acids are improved by treating said salts or their acid precursors with phosphites, especially triaryl phosphites. This process reduces the tendency of the salts to stain and corrode metal parts, especially copper parts, when incorporated in lubricants and functional fluids. The process may also be used to treat mixed metal salts of dialkylphosphorodithioic and carboxylic acids.
Claims22
A method for improving the properties of excess sulfur-containing salts of phosphorus acids of the formula (RO).sub.2 PSSH, wherein each R is independently a hydrocarbon-based radical, which comprises contacting said salts or their phosphorus acid precursors under reaction conditions with at least one phosphite of the formula (R'O).sub.3 P, wherein each R' is a hydrocarbon-based radical, at a temperature between about 50.degree. and about 200.degree. C.
Dependencies are inferred from the claim text.