| abstract |
Graft copolymers are disclosed in which the backbone comprises a hydrocarbon polymer, such as an ethylene/ propylene copolymer and the grafted units are the residues of a monomer system comprising maleic acid or anhydride and one or more other monomers, the grafts being post-reacted with a polyamino compound. The graft copolymers impart combined detergent and viscosity index properties to lubricating oils and hydrocarbon motor fuels. |