Exxon Research and Engineering Company

Lawrence J Engel

John B Gardiner

Won R Song

Robert L Elliott

J Brooke Gardiner

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

Copolymers, having a degree of crystallinity of 3 up to 25 weight percent, comprising about 68 to 80 mole % ethylene, and one or more C.sub.3 to C.sub.8 alpha-olefins are mechanically degraded at elevated temperatures, in the presence of air or oxygen-containing gas, to form an oxygenated-degraded polymer, which is reacted with an amine compound. Preferably, the polymer is only partially reacted with the amine. The resulting aminated polymers are useful as sludge dispersants for fuels and lubricants. When the aminated polymers have a high molecular weight, they are also useful as viscosity-index improvers.

Aminated polymeric additives for fuels and lubricants

Ethylene copolymers derived from about 2 to 98 wt. % ethylene, and one or more C.sub.3 to C.sub.28 alpha olefins, e.g. ethylene-propylene, are solution-grafted under an inert atmosphere and at elevated temperatures with an ethylenically-unsaturated carboxylic acid material in the presence of a high-temperature decomposable free-radical initiator and thereafter reacted with a polyfunctional material reactive with carboxy groups; such as (a) a polyamine, or (b) a polyol, or (c) a hydroxyamine, or mixtures thereof, to form carboxyl-grafted polymeric derivatives, which have good engine sludge and varnish control behavior in fuels and lubricating oils. If the molecular weight is above 10,000, then these polymers are also useful as multifunctional viscosity index improvers.

Polymeric additives for fuels and lubricants

Aminated polymers, resulting from the reaction of a hydrocarbon polymer with an oxygen-containing gas and an amine compound at elevated temperatures of from about 130.degree. C. to about 300.degree. C. provide a multi-functional additive for lubricants and hydrocarbon fuels. This reaction can be carried out if desired in an oil solution. The resulting aminated polymers are useful as sludge dispersants for fuel lubricants. When the aminated polymers have a high molecular weight, they are also useful as viscosity-index improvers with dispersant and/or pour point depressant activity.

Aminated polymeric additives for fuel and lubricants

Hydrocarbon polymers, preferably polymers having a degree of crystallinity of less than about 25 weight percent and comprising about 2 to 98 weight percent ethylene, and one or more C.sub.3 to C.sub.28 alpha-olefins, are mechanically grafted under an inert atmosphere and at elevated temperatures, in the presence of an amine compound, to form an amino-grafted polymer. The resulting aminated polymers are useful as sludge dispersants for fuels and lubricants. When the aminated polymers have a higher molecular weight, they are also useful as viscosity-index improvers with dispersant and/or pour point depressant activity.

Hydrocarbon polymers, optimally, copolymers having a degree of crystallinity of up to 25 weight percent, comprising about 2 to 98 mole percent ethylene, and one or more C.sub.3 to C.sub.28 alpha-olefins are mechanically grafted at elevated temperatures, under an inert atmosphere, to form an aminated polymer which is thereafter mechanically-oxidatively degraded at an elevated temperature in the presence of air or oxygen-containing gas to form an aminated polymeric reaction product. The resulting aminated polymers are useful as sludge dispersants for fuels and lubricants. When the aminated polymers have a high molecular weight, they are also useful as viscosity-index improvers with dispersant and/or pour point depressant activity.

Preparation of aminated polymeric additives useful as oil additives, for example as dispersants for hydrocarbon fuels and lubricants, and as multifunctional dispersant-viscosity index improvers for lubricants, by the reaction of amine with a halogen containing copolymer of ethylene, a C.sub.3 to C.sub.18 straight or branched chain .alpha.-olefin and a C.sub.5 to C.sub.14 acyclic or alicyclic nonconjugated diolefin, said halogen containing copolymer being prepared by the halogenation of said copolymer.

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Green Brook, NJ, United States of America

Lawrence J Engel