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US 4,392,966 AGranted
Molybdenum-zinc dialkyldithiophosphates as lubricant additives
AssigneeTexaco Inc.
InventorRaymond C. Schlicht
Life of this patent
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Abstract
The invention provides molybdenum-zinc dialkyldithiophosphates useful as friction-reducing, anti-wear and oxidation-inhibiting agents in lubricants, in particular, in fuel economy oils.
Claims11
An oil soluble lubricant additive having the generic formula:
- ZnMo.sub.2 O.sub.x [S.sub.2 P(OR).sub.2 ].sub.y
- wherein x=0-3;
- y=6 to 12 and R is a straight-chained or branched hydrocarbyl group having from 3 to 30 carbon atoms or a mixture of at least two such hydrocarbyl groups where each group can have values ranging from 1 to 99 molar percents and whose sum equals 100.
A process for preparing molybdenum/zinc dialkyldithiophosphates comprising reducing with zinc metal a hexavalent molybdic acid and/or acified molybdenum salt solution;
- reacting the zinc and molybdenum intermediate species thus formed with sufficient dialkyldithiophosphoric acid to convert both metals to their dialkyldithiophosphate salts and isolating the product without separating said salts.
Dependencies are inferred from the claim text.