| 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 3 to C 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. |