Additives and lubricant formulations for improved corrosion protection
A lubricated surface and method for lubricating moving parts. The lubricated surface includes a thin film coating of a lubricant composition containing a base oil of lubricating viscosity and from about 9.5 to about 25 percent by weight of an additive comprising a nitrogen containing olefin copolymer derived from an olefin copolymer having grafted thereon from about 0.15 to about 1.0 carboxylic groups per 1000 number average molecular weight units of the copolymer. The copolymer has a number average molecular weight ranging from about 10,000 to about 100,000. The amount of additive in the lubricant composition is based on a total weight of the lubricant composition.
1 . A lubricated surface comprising a thin film coating of a lubricant composition containing a base oil of lubricating viscosity and from about 9.5 to about 25 percent by weight of an additive comprising a nitrogen containing olefin copolymer derived from an olefin copolymer having grafted thereon from about 0.15 to about 1.0 carboxylic groups per 1000 number average molecular weight units of the copolymer, wherein the copolymer has a number average molecular weight ranging from about 10,000 to about 100,000, and wherein the amount of additive in the lubricant composition is based on a total weight of the lubricant composition.
2 . The lubricated surface of claim 1 , wherein the lubricated surface comprises an engine drive train.
3 . The lubricated surface of claim 1 , wherein the lubricated surface comprises an internal surface or component of an internal combustion engine.
4 . The lubricated surface of claim 1 , wherein the lubricated surface comprises an internal surface or component of a compression ignition engine.
5 . The lubricated surface of claim 1 , wherein the copolymer has grafted thereon from about 0.3 to about 0.75 carboxylic groups per 1000 number average molecular weight units of the copolymer, wherein the copolymer has a number average molecular weight ranging from about 30,000 to about 60,000.
6 . A motor vehicle comprising the lubricated surface of claim 1 .
7 . A vehicle having moving parts and containing a lubricant for lubricating the moving parts, the lubricant comprising an oil of lubricating viscosity and from about 9.5 to about 25 percent by weight of an additive comprising a nitrogen containing olefin copolymer derived from an olefin copolymer having grafted thereon from about 0.15 to about 1.0 carboxylic groups per 1000 number average molecular weight units of the copolymer, wherein the copolymer has a number average molecular weight ranging from about 10,000 to about 100,000, and wherein the amount of additive in the lubricant composition is based on a total weight of the lubricant composition.
8 . The vehicle of claim 7 , wherein the copolymer has grafted thereon from about 0.3 to about 0.75 carboxylic groups per 1000 number average molecular weight units of the copolymer, wherein the copolymer has a number average molecular weight ranging from about 30,000 to about 60,000.
9 . The vehicle of claim 7 , wherein the moving parts comprise a heavy duty diesel engine including exhaust gas recirculation and a lubricating system for the engine.
10 . A fully formulated lubricant composition comprising a base oil component of lubricating viscosity and from about 9.5 to about 25 percent by weight of an additive comprising a nitrogen containing olefin copolymer derived from an olefin copolymer having grafted thereon from about 0.15 to about 1.0 carboxylic groups per 1000 number average molecular weight units of the copolymer, wherein the copolymer has a number average molecular weight ranging from about 10,000 to about 100,000, and wherein the amount of additive in the lubricant composition is based on a total weight of the lubricant composition.
11 . The lubricant composition of claim 10 wherein the lubricant composition comprises a low ash, low sulfur lubricant compositions suitable for compression ignition engines.
12 . The lubricant composition of claim 10 , wherein the copolymer has grafted thereon from about 0.3 to about 0.75 carboxylic groups per 1000 number average molecular weight units of the copolymer, wherein the copolymer has a number average molecular weight ranging from about 30,000 to about 60,000.
13 . A method for reducing corrosion of metal parts in an engine comprising contacting the engine parts with a lubricant composition comprising a base oil component of lubricating viscosity and from about 9.5 to about 25 percent by weight of an additive comprising a nitrogen containing olefin copolymer derived from an olefin copolymer having grafted thereon from about 0.15 to about 1.0 carboxylic groups per 1000 number average molecular weight units of the copolymer, wherein the copolymer has a number average molecular weight ranging from about 10,000 to about 100,000, and wherein the amount of additive in the lubricant composition is based on a total weight of the lubricant composition.
14 . The method of claim 13 wherein the engine comprises a diesel engine provided with exhaust gas recirculation.
15 . The method of claim 13 wherein the engine comprises an inboard or outboard marine engine.
16 . The method of claim 13 wherein the engine comprises an engine exposed to a salt water environment.
17 . The method of claim 13 , wherein the copolymer has grafted thereon from about 0.3 to about 0.75 carboxylic groups per 1000 number average molecular weight units of the copolymer, wherein the copolymer has a number average molecular weight ranging from about 30,000 to about 60,000.
18 . A lubricant additive concentrate comprising a diluent or carrier oil and from about 5 to about 90 percent by weight of an additive comprising a nitrogen containing olefin copolymer derived from an olefin copolymer having grafted thereon from about 0.15 to about 1.0 carboxylic groups per 1000 number average molecular weight units of the copolymer dissolved in a suitable solvent, wherein the copolymer has a number average molecular weight ranging from about 10,000 to about 100,000, wherein the amount of additive in the concentrate is based on a total weight of the concentrate, and wherein a fully formulated lubricant composition containing the concentrate will contain from about 9.5 to about 25 percent by weight of the additive based on a total weight of the lubricant composition.
19 . The additive concentrate of claim 18 , wherein the copolymer has grafted thereon from about 0.3 to about 0.75 carboxylic groups per 1000 number average molecular weight units of the copolymer, wherein the copolymer has a number average molecular weight ranging from about 30,000 to about 60,000.
20 . A lubricant composition comprising a base oil and the additive concentrate of claim 18 .
21 . A method of lubricating moving parts of a vehicle, the method comprising using as a lubricating oil for one or more moving parts of the vehicle a lubricant composition containing a base oil and a lubricant additive, the lubricant additive comprising a diluent or carrier oil and a nitrogen containing olefin copolymer derived from an olefin copolymer having grafted thereon from about 0.15 to about 1.0 carboxylic groups per 1000 number average molecular weight units of the copolymer dissolved in a suitable solvent, wherein the copolymer has a number average molecular weight ranging from about 10,000 to about 100,000, wherein the lubricant composition contains from about 9.5 to about 25 percent by weight of the additive based on a total weight of the lubricant composition.
22 . The method of claim 21 wherein the vehicle includes a diesel engine provided with exhaust gas recirculation and wherein the moving parts include moving parts of the engine.
23 . The method of claim 21 wherein the vehicle includes a marine vehicle having an engine, and wherein the moving parts include moving parts of the engine.
24 . The method of claim 21 , wherein the copolymer has grafted thereon from about 0.3 to about 0.75 carboxylic groups per 1000 number average molecular weight units of the copolymer, wherein the copolymer has a number average molecular weight ranging from about 30,000 to about 60,000.
25 . The method of claim 21 wherein the vehicle includes an internal combustion engine having a crankcase and wherein the lubricant composition comprises a crankcase oil present in the crankcase of the vehicle.
26 . The method of claim 21 wherein the lubricant composition comprises a drive train lubricant present in an automotive drive train of the vehicle.
27 . A method of lubricating moving parts comprising contacting the moving parts with a lubricant composition containing a lubricant additive, the lubricant additive comprising a diluent or carrier oil and a nitrogen containing olefin copolymer derived from an olefin copolymer having grafted thereon from about 0.15 to about 1.0 carboxylic groups per 1000 number average molecular weight units of the copolymer dissolved in a suitable solvent, wherein the copolymer has a number average molecular weight ranging from about 10,000 to about 100,000, wherein the lubricant composition contains from about 9.5 to about 25 percent by weight of the additive based on a total weight of the lubricant composition.
28 . The method of claim 27 wherein the moving parts comprise moving parts of a vehicle.
29 . The method of claim 28 wherein the vehicle includes a marine vehicle having an engine, and wherein the moving parts include moving parts of the engine.
30 . The method of claim 27 , wherein the copolymer has grafted thereon from about 0.3 to about 0.75 carboxylic groups per 1000 number average molecular weight units of the copolymer, wherein the copolymer has a number average molecular weight ranging from about 30,000 to about 60,000.
31 . The method of claim 27 wherein the moving parts include an internal combustion engine having a crankcase and wherein the lubricant composition comprises a crankcase oil present in the crankcase of the vehicle.
32 . The method of claim 27 wherein the lubricant composition comprises a drive train lubricant present in an automotive drive train of the vehicle.
33 . A metal surface comprising a corrosion inhibiting amount of an oleaginous coating composition containing from about 9.5 to about 25 percent by weight of an additive comprising a nitrogen containing olefin copolymer derived from an olefin copolymer having grafted thereon from about 0.15 to about 1.0 carboxylic groups per 1000 number average molecular weight units of the copolymer, wherein the copolymer has a number average molecular weight ranging from about 10,000 to about 100,000, and wherein the amount of additive in the composition is based on a total weight of the oleaginous coating composition.
34 . The metal surface of claim 33 , wherein the copolymer has grafted thereon from about 0.3 to about 0.75 carboxylic groups per 1000 number average molecular weight units of the copolymer, wherein the copolymer has a number average molecular weight ranging from about 30,000 to about 60,000.