Aminated polymeric additives for fuel and lubricants
AssigneeExxon Research & Engineering Co.
InventorsLawrence J. Engel, John B. Gardiner
Life of this patent
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Abstract
Hydrocarbon polymers, preferably polymers having a degree of crystallinity of less than about 25 weight percent and comprising about 2 to 98 weight percent ethylene, and one or more C.sub.3 to C.sub.28 alpha-olefins, are mechanically grafted under an inert atmosphere and at elevated temperatures, in the presence of an amine compound, to form an amino-grafted polymer. The resulting aminated polymers are useful as sludge dispersants for fuels and lubricants. When the aminated polymers have a higher molecular weight, they are also useful as viscosity-index improvers with dispersant and/or pour point depressant activity.
Claims4
In a process for aminating an olefin copolymer to form an oil-soluble aminated copolymer useful as a sludge dispersing-viscosity index improving, additive for lubricating oil, the improvement which comprises carrying out said amination without substantial molecular weight degradation of said copolymer by mechanically working a mixture consisting essentially of amine and said copolymer, at a temperature of about 130.degree. to 260.degree. C., under an inert gas atmosphere, for about 0.5 to 12 hours to thereby incorporate about 0.01 to 0.5 weight percent nitrogen into said copolymer, wherein said copolymer is a copolymer having a number average molecular weight in the range of about 10,000 to 500,000 and consists essentially of ethylene in an amount in the range of 2 to 98 wt. %, and one or more C.sub.3 to C.sub.28 alpha-olefins, and wherein said amine is a saturated, aliphatic hydrocarbyl polyamine of 3 to 20 carbon atoms and 2 to 6 nitrogen atoms.
Dependencies are inferred from the claim text.