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US 11,459,520 B2Granted
Aliphatic tetrahedral borate compounds for lubricating compositions
AssigneeThe Lubrizol Corporation
InventorsJames D. Burrington, Ewan E. Delbridge, Binbin Guo, Jason J. Hanthorn
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Abstract
An additive for a lubricating composition includes an ionic tetrahedral borate compound which includes a cation and a tetrahedral borate anion having a boron atom, the boron atom has at least one aliphatic bidentate di-oxo ligand. The cation may be selected to provide detergent and/or dispersant and/or antioxidant properties to a lubricating composition.
Claims21
An additive for a lubricating composition comprising:
- an ionic tetrahedral borate compound comprising a cation selected from the group consisting of metal cations, ammonium ions, phosphonium ions, and mixtures thereof, and a tetrahedral borate anion which comprises a boron atom, the borate anion having at least one bidentate di-oxo ligand formed from reaction of a trivalent boron compound and an aliphatic vicinal diol, and
- wherein the borate anion is substantially free of a bidentate aromatic di-oxo ligand.
A method of forming an additive for a lubricating composition comprising,
- reacting in a liquid solvent medium an aliphatic vicinal diol with a trivalent borate compound and, optionally, a basic component to form an ionic tetrahedral borate compound comprising a cation selected from the group consisting of metal cations, ammonium ions, phosphonium ions, and mixtures thereof, and a tetrahedral borate anion which comprises a boron atom, the borate anion having at least one bidentate di-oxo ligand formed from reaction of the trivalent boron compound and the aliphatic vicinal diol,
- wherein the solvent medium is selected from the group consisting of alcohol solvents, ether solvents, ester solvents, ketone solvents and blends thereof,
- wherein water resulting from the reaction of the aliphatic vicinal diol and trivalent borate compound is azeotropically distilled with a portion of the liquid solvent medium.
Dependencies are inferred from the claim text.