Mixed metal salts and lubricants and functional fluids containing them
AssigneeThe Lubrizol Corporation
InventorsDonald L. Clason, Calvin W. Schroeck
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Abstract
Mixed metal salts (especially zinc salts) of dialkylphosphorodithioic acids and carboxylic acids, the ratio of equivalents of the dialkylphosphorodithioic to the carboxylic acid being between about 0.5:1 and about 4.5:1, are useful in lubricants and functional fluids (such as hydraulic fluids) as antioxidants and extreme pressure agents having improved thermal stability.
Claims14
A mixed metal salt of (A) at least one acid of the formula ##STR2## wherein each of R.sup.1 and R.sup.2 is a hydrocarbon-based radical, and (B) at least one carboxylic acid having the formula R.sup.3 COOH which contains from about 5 to about 20 carbon atoms and wherein R.sup.3 is an aliphatic or alicyclic hydrocarbonbased radical;
- the ratio of equivalents of A to B being between 2.5:1 and about 4.5:1;
- up to about 2 equivalents of metal being present per equivalent of acid;
- and the metal being at least one of Group I metals, Group II metals, aluminum, tin, cobalt, lead, molybdenum, manganese and nickel.
A mixed salt according to claim 1, 3, 4, 8 or 5 wherein the ratio of equivalents of A to B is between 2.5:1 and 4.25:1.
A mixed salt according to claim 1, 2, 3, 4, 5, 6, 10, 7 or 8 wherein the metal is zinc.
Dependencies are inferred from the claim text.