Patent ID: 7531486
Filing Date: 2009-05-12
Classification: C10M,C10N

Abstract:
1. A composition suitable as an additive package for a lubricating oil, said composition comprising a phosphorus-containing antiwear component, a nitrogen-containing compound, selected from oil-soluble aliphatic mono-amines in which the aliphatic group is a tertiary alkyl group, 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 phosphorous containing antiwear component is provided by at least one acid phosphate having the formula R 1 O(R 2 O)P(O)OH, where R 1 is hydrogen or hydrocarbyl and R 2 is hydrocarbyl.