Exxon Research and Engineering Company

J Brooke Gardiner

Robert L Elliott

Lawrence J Engel

A lubricating oil composition comprising a major amount of lubricating oil and a viscosity index improving amount of an oil-soluble polymer composition comprising an ethylene copolymer, preferably an oxidatively and mechanically degraded ethylene copolymer, having an ethylene content of 26-79 weight percent (35-85 mole percent), a C.sub.3 to C.sub.18 higher alpha-olefin and from about 1-25 weight percent of an alkyl norbornene having from about 8 to 28 carbons, preferably ethyl norbornene and preferably at least a pour point depressing amount of a lubricating oil pour point depressant, e.g. an alkyl fumarate vinyl acetate copolymer, whereby superior low temperature viscometrics is provided to said lubricating oil composition.

Oil compositions containing oil-soluble, oxidatively and mechanically

Multipurpose lubricating oil additives having utility as viscosity index improvers, antiwear agents, sludge dispersants and pour point depressants comprise oil-soluble reaction products of (1) nitrogen compounds having one or more amino groups and/or (2) oxygen compounds having one or more hydroxyl, epoxide or ether groups and/or (3) sulfurizing agent and/or boron compound and/or phosphorous compound with an electrophilically terminated anion of an oxidized copolymer of ethylene and at least one C.sub.3 -C.sub.50 alpha monoolefin.

Multipurpose lubricating oil additive based on electrophilically

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.

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Mountainside, NJ, United States of America

J Brooke Gardiner