Functionalized graft co-polymer as a viscosity and index improver, dispersant, and anti-oxidant additive and lubricating oil composition containing same

摘要

A derivatized graft copolymer composition comprising an ethylene alpha-monoolefin copolymer comprising about 15 to about 80 mole % ethylene, about 20 to about 85 mole % of at least one (C3-C10) alpha-monoolefin and, optionally, 0 to about 15 mole % of a polyene selected from non-conjugated dienes and trienes and having an average molecular weight ranging from about 5,000 to about 500,000; grafted with at least one ethylenically unsaturated carboxylic acid material; and derivatized with an amino-aromatic compound.