Additive system for lubricant
AssigneeExxonMobil Chemical Patents Inc.
InventorsWilliam Sullivan, Halou Oumar-Mahamat, Ellen Brandes
Life of this patent
Estimating the term…
Abstract
The invention relates to additive systems which contain a phosphorus to nitrogen ratio of ≦1.0. The phosphorus contribution is primarily from an acid phosphate species and the sulfur content is primarily from an antiwear agent. This lubricant composition has been found to provide exceptional protection to new gears or “green gears”, during the break-in phase.
Claims9
A composition suitable as an additive package for a lubricating oil, said composition comprising a phosphorus-containing antiwear component, a nitrogen-containing compound, and a sulfur-containing extreme pressure component, said composition characterized by having a phosphorus to nitrogen weight ratio of greater than or equal to about 1.0, based on the weight of the entire composition, wherein at least 50 wt % of said antiwear component is provided by at least one acid phosphate having the formula RIO(R2O)P(O)OH, where R1 is hydrogen or hydrocarbyl and R2 is hydrocarbyl.
Dependencies are inferred from the claim text.