Oil-soluble hydrolyzed anionic-graft polymer of ethylene- propylene copolymer and anionically polymerizable nitrile monomer and derivatives thereof having utility as multifunctional V. I. improver for lubricating oils

摘要

An oil-soluble, hydrolyzed, anionic-graft polymer of an anionically polymerizable nitrile monomer, preferably a C.sub.3 -C.sub.24 vinyl cyanide monomer, e.g. acrylonitrile, and an anion of an oxidized copolymer of ethylene and at least one C.sub.3 to C.sub.50 alpha monoolefin, e.g. propylene, said anionic-graft polymer in its preferred form containing from about 0.005 to 2% by weight nitrogen and having a number average molecular weight of from about 1000 to 500,000, has utility as a multifunctional V.I. improver and/or dispersant for lubricating oils or as an intermediate for derivatization, as by reaction with a nitrogen compound, to increase the oil additive activity.