Back to results
US 4,144,181 AGranted
Polymeric additives for fuels and lubricants
AssigneeExxon Research & Engineering Co.
InventorsRobert L. Elliott, John B. Gardiner
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeExxon Research & Engineering Co.
InventorsRobert L. Elliott, John B. Gardiner
Estimating the term…
Oil-soluble, derivatized 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. propylene, which are grafted, preferably solution-grafted under an inert atmosphere and at elevated temperatures and in the presence of a high-temperature decomposable free-radical initiator, with an ethylenically-unsaturated carboxylic acid material and thereafter reacted with a polyfunctional material reactive with carboxy groups; such as (a) a polyamine, or (b) a polyol, or (c) a hydroxy amine, or mixtures thereof to form carboxyl-grafted polymeric derivatives are reacted with oil-soluble hydrocarbyl substituted acids, preferably with long chain alkyl aryl sulfonic acids with an average side chain carbon number of about 20-40, to yield haze-free hydrocarbon solutions, e.g. a lubricant additives composition, of increased dispersant potency. Useful number average molecular weight (M.sub.n) of said copolymers range from about 700 to 500,000, however, if the molecular weight is from 10,000 to 500,000 then these copolymers are also useful as multifunctional viscosity index improvers.
A substantially haze-free lubricating oil composition comprising a lubricating oil and from about 0.1 to 50 wt. %, based upon the total weight of said composition, of ethylene copolymeric dispersant-viscosity index improver material, which material has been formed by grafting an ethylene copolymer comprising about 30 to 80 wt. % ethylene and about 20 to 70 wt. % C.sub.3 to C.sub.18 alpha olefin, with an ethylenically unsaturated compound selected from the group consisting of unsaturated carboxylic acid and anhydride of carboxylic acid, said ethylene copolymer when grafted with said carboxylic acid or said anhydride being further reacted with a polyfunctional reactant selected from the group consisting of polyamine, polyol and hydroxy amine, and reacting with from about 0.1 to 8 wt. % of an oil-soluble hydrocarbyl substituted strong acid containing from about 3 to about 70 total carbons to thereby inhibit haze in said composition, and wherein said strong acid is selected from the group consisting of alkyl carboxylic acids, phosphoric acid, phosphonic acid, thiophosphonic acid, phosphinic acid, thiophosphinic acid, sulfonic acid, sulfuric acid, sulfinic acid and alpha-substituted halo- or nitro- or nitrilo- carboxylic acids.
A substantially haze-free lubricating oil composition comprising a lubricating oil and from about 0.1 to 50 wt. %, based upon the total weight of said composition, of ethylene copolymeric dispersant-viscosity index improver material, which material has been formed by grafting an ethylene copolymer comprising about 30 to 80 wt. % ethylene and about 20 to 70 wt. % C.sub.3 to C.sub.18 alpha olefin, with a vinyl monomer containing nitrogen, and reacting with from about 0.1 to 8 wt. % of an oil-soluble hydrocarbyl substituted strong acid containing from about 3 to about 70 total carbons, to thereby inhibit haze in said composition.
Dependencies are inferred from the claim text.