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US 6,541,430 B1Granted
Fluorinated lubricant additives
AssigneeE. I. Du Pont de Nemours and Company
InventorRichard P. Beatty
Life of this patent
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Abstract
Fluorinated dialkyl dithiophosphoric acids according to formula (I) and metallic salts thereof: the compounds are useful, for example, as additives for lubricant compositions.
Claims2
A process of making an anti-wear additive comprising:
- a) preparing a mixture of two or more compounds, wherein said mixture includes at least one fluorinated compound and at least one non-fluorinated compound;
- b) reacting the mixture with a thiophosphorus compound to form one or more oxygen linkages between the phosphorus atom of the thiophosphorus compound and each of the fluorinated and non-fluorinated compounds;
- and
- c) recovering a fluorinated dithiophosphoric acid compound having the molecular structure:
- wherein R1 and R2 are each independently selected from the group consisting of fluorinated C1 to C40 organic residues;
- and
- wherein R1 and R2 are the same or different, or R1 and R2 may form a ring.
4 more elements
Dependencies are inferred from the claim text.