Additive combinations for lubricants and functional fluids
AssigneeThe Lubrizol Corporation
InventorCraig D. Tipton
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Abstract
This invention relates to a composition, comprising: (A) a Mannich dispersant having a base number in the range of about 45 to about 90; (B) a boron compound; and (C) an organic phosphorus acid or ester, or derivative of said phosphorus acid or ester. In one embodiment, this composition further comprises (D) a thiocarbamate. In one embodiment, this composition further comprises (E) a nitrogen-containing ester of a carboxy-containing interpolymer. These compositions are useful as additives for lubricants and functional fluids, and are particularly useful as additives for automatic transmission fluids for enhancing the torque characteristics such automatic transmission fluids.
Claims12
A lubricating composition having improved torque characteristics, said composition comprising:
- An oil of lubricating viscosity and a concentrate package mixed therewith, said concentrate package comprising:
- (A) 0.5-5 percent by weight of Mannich dispersant having total base number (TBN) of about 45-90;
- (B) 0.5-5 percent by weight of a borated dispersant;
- (C) 0.05-5 percent by weight of an organic phosphorus acid or ester;
- (D) up to 2 percent by weight of a dithiocarbamate;
- and
- (E) up to 7 percent by weight of a nitrogen-containing ester of a carbonyl-containing interpolymer,
- wherein the percents by weight are based on the weight of said lubricating compositions.
Dependencies are inferred from the claim text.