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US 11,180,711 B2Granted
Nitrogen-functionalized olefin polymers for driveline lubricants
AssigneeThe Lubrizol Corporation
InventorsSona Sivakova, David M. Nickerson, Paul Simon O'Hora, William R. S. Barton
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Abstract
A lubricant composition of an oil of lubricating viscosity, a grafted copolymer viscosity modifier that is an ashless condensation reaction product of an olefin polymer, having a number average molecular weight of about 1000 to about 10,000, comprising carboxylic acid or equivalent functionality grafted onto the polymer backbone, with a monoamine or a polyamine often having a single primary amino group, which exhibits good dispersancy and viscometric performance in a driveline device.
Claims17
A lubricant composition for a driveline system comprising:
- (a) an oil of lubricating viscosity having a kinematic viscosity at 100° C. of about 2 to about 10 cSt;
- (b) 3 to 50 wt % of the composition of at least one viscosity modifier comprising a grafted copolymer that is an oil soluble ashless condensation reaction product of an olefin polymer, having a number average molecular weight (“Mn”) as measured by Gel Permeation Chromatography (“GPC”) with a polystyrene standard of about 1000 to about 10,000, comprising carboxylic acid functionality or a reactive equivalent thereof grafted onto the polymer backbone, with an amine that is substantially free of aromatic amine, provided that if the olefin polymer is an ethylene/propylene copolymer, then said amine is one of an aliphatic amine, or a heterocyclic amine;
- (c) at least one oil soluble phosphorus containing antiwear agent
- wherein the lubricant is for an automotive gear and has a sulfur content of about 100 to about 40,000 ppm and a phosphorus content of about 200 ppm to about 3000 ppm.
1 more element
Dependencies are inferred from the claim text.