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AssigneeExxon Chemical Patents Inc.
InventorsDennis G. Peiffer, Kenneth Lewtas, Robert D. Lundberg, Pamela J. Wright, Antonio G. Lazarus, Jacob Emert
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A copolymer comprising units of an unsaturated dicarboxylic monomer and an ethylene .alpha.-olefin macromer is disclosed. The macromer is an unsaturated ethylene .alpha.-olefin polymer comprising units of from ethylene and at least one .alpha.-olefin represented by the formula CH.sub.2 .dbd.CHR.sup.a, wherein R.sup.a is a C.sub.1 to C.sub.18 linear alkyl group or a C.sub.3 to C.sub.18 branched alkyl group; the ethylene .alpha.-olefin polymer has a number average molecular weight of from about 500 to about 100,000; and at least about 30% of the unsaturation in the ethylene .alpha.-olefin polymer is terminal vinylidene. The copolymer has a carbon-carbon backbone and contains succinic groups and hydrocarbyl groups. The copolymer can be derivatized by reaction with nucleophilic reactants including monoamines, polyamines, monoalcohols, polyols, amino alcohols, reactant metal compounds and mixtures thereof. The derivatized copolymers can be post-treated (e.g., borated) with one or more post-treating agents (e.g., boric acid). The copolymer, its derivatives, and post-treated derivatives are useful as additives (e.g., dispersants and viscosity index improvers) in fuels and in lubricating oils.
A copolymer comprising units of an unsaturated dicarboxylic monomer and an unsaturated ethylene .alpha.-olefin polymer which comprises units of ethylene and at least one .alpha.-olefin represented by the formula CH.sub.2 .dbd.CHR.sup.a, wherein R.sup.a is a C.sub.1 to C.sub.18 linear alkyl group or a C.sub.3 to C.sub.18 branched alkyl group;
A product prepared by a process comprising polymerizing an unsaturated dicarboxylic reactant with an unsaturated polymer reactant in the presence of a free radical initiator at a temperature in the range of from about 20 to about 140.degree. C., wherein the unsaturated polymer reactant comprises an ethylene .alpha.-olefin polymer comprising units of ethylene and at least one .alpha.-olefin represented by the formula CH.sub.2 .dbd.CHR.sup.a, wherein R.sup.a is a C.sub.1 to C.sub.18 linear alkyl group or a C.sub.3 to C.sub.18 branched alkyl group;
A process comprising polymerizing an unsaturated dicarboxylic reactant with an unsaturated polymer reactant in the presence of a free radical initiator at a temperature in the range of from about 20 to about 140.degree. C., wherein the unsaturated polymer reactant comprises an ethylene .alpha.-olefin polymer comprising units of ethylene and at least one .alpha.-olefin represented by the formula CH.sub.2 .dbd.CHR.sup.a, wherein R.sup.a is a C.sub.1 to C.sub.18 linear alkyl group or a C.sub.3 to C.sub.18 branched alkyl group;
Dependencies are inferred from the claim text.