Aliphatic tetrahedral borate compounds for lubricating compositions
AssigneeThe Lubrizol Corporation
InventorsJames D. Burrington, Ewan E. Delbridge, Binbin Guo, Jason J. Hanthorn
Life of this patent
Estimating the term…
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.
Claims28
An additive for a lubricating composition comprising:
- an ionic tetrahedral borate compound comprising a cation 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 di-hydroxyl compound, and
- wherein the borate anion is substantially free of a bidentate aromatic di-oxo ligand.
The additive of 19, wherein the polyisobutylene from which the polyisobutylene succinimide is derived has a number average molecular weight in the range of 350 to 5000, or 750 to 2500.
A method of forming an additive for a lubricating composition comprising.
- reacting in a liquid solvent medium an aliphatic di-hydroxyl compound with a trivalent borate compound and, optionally, a basic component to form an ionic tetrahedral borate compound comprising a cation 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 di-hydroxyl compound,
- 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 di-hydroxyl compound and trivalent borate compound is azeotropically distilled with a portion of the liquid solvent medium.
Dependencies are inferred from the claim text.