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AssigneeExxon Chemical Patents Inc.
InventorsJacob Emert, Albert Rossi, Salvatore Rea, Jeffrey W. Frederick, Mahn W. Kim
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The invention pertains to oil soluble copolymers derived from ethylene and 1-butene which have a number average molecular weight between about 1,500 and 7,500, at least about 30 percent of all polymer chains terminated with ethylvinylidene groups, and ethylene-derived content of not greater than about 50 weight percent, and which form solutions in mineral oil free of polymer aggregates, as determined by light scattering measurements. Lubricating oil additives, particularly dispersants, produced by the functionalization and derivatization of these copolymers have enhanced performance (e.g., improved dispersancy and pour point) in lubricating oil compositions, attributable in part to the combination of properties characterizing the copolymers.
Oil soluble copolymer comprising from 1 to about 50 weight percent monomer units derived from ethylene and from about 99 to about 50 weight percent monomer units derived from 1-butene, based on the total polymer weight, and having a number average molecular weight between about 1,500 and 7,500, ethylvinylidene groups terminating at least about 30 percent of all copolymer chains, and an absence of aggregation in solution with mineral oil as determined by having an S.sub.f value of about zero.
Oil soluble copolymer which consists essentially of from about 10 to about 35 weight percent monomer units derived from ethylene and from about 90 to about 65 weight percent monomer units derived from 1-butene, based on the total polymer weight, the copolymer having a number average molecular weight between about 1,500 and 6,000, ethylvinylidene groups terminating at least about 30 percent of all copolymer chains, and an absence of aggregation in solution with mineral oil as determined by having an S.sub.f value of about zero.
Lubricating oil composition comprising a major amount of a lubricating base oil, an effective amount of lubricating oil flow improver, and a minor amount of oil soluble copolymer, the copolymer comprising from 1 to about 50 weight percent monomer units derived from ethylene and from about 99 to about 50 weight percent monomer units derived from 1-butene, based on the total copolymer weight, and having a number average molecular weight between about 1,500 and 7,500, ethylvinylidene groups terminating at least about 30 percent of all copolymer chains, and an absence of aggregation in solution with mineral oil as determined by having an S.sub.f value of about zero.
Lubricating oil dispersant additive which comprises derivatized ethylene-1-butene copolymer comprising from 1 to about 50 weight percent ethylene derived units and from about 99 to about 50 weight percent 1-butene derived units, based on total copolymer weight, and having a number average molecular weight between about 1,500 and 7,500, ethylvinylidene groups terminating at least about 30 percent of all copolymer chains, and an S.sub.f value of about zero.
Dependencies are inferred from the claim text.