Novel dispersant-VI improvers and lubricating oil containing same
AssigneeTexaco Inc.
InventorsHarry Chafetz, Richard F. Love, James O. Waldbillig
Life of this patent
Estimating the term…
Abstract
This invention concerns dispersant-VI improvers prepared by reacting a polyamine-derived dispersant with an oxidized ethylene-propylene polymer or ethylene-propylene-diene terpolymer. The products thus formed have a dispersancy superior to that obtained by separately blending the reactants in a lubricating oil. Also disclosed are oils containing the present dispersant-VI improvers.
Claims10
A lubricating composition comprising a major portion of a lubricating oil and an effective dispersing and viscosity improving amount of an additive obtained by oxidizing in an inert solvent or in mineral oil, optionally in the presence of a free radical initiator, an ethylene/propylene copolymer or terpolymer having a molecular weight of about 5,000 to about 500,000, the termonomer thereof being an unsaturated hydrocarbon, until the formation of adequate carbonyl groups due to oxidation and condensing the oxidized portion of the resulting polymer oxidate with the amine function of a nitrogenous dispersant derived from the reaction of a dicarboxylic anhydride with a polyamine.
A composition of matter useful as a lubricating oil additive consisting of the reaction product of an oxidate of an ethylene-propylene copolymer or terpolymer with a dispersant derived from a dicarboxylic anhydride reacted with a polyamine, said copolymer or terpolymer having a molecular weight in the range of 5,000 to 500,000 and being selected from ethylene-propylene copolymers or ethylene-propylene terpolymers wherein the termonomer is an unsaturated hydrocarbon.
A process comprising:
- oxidizing in an inert solvent or mineral oil at 140.degree. to 160.degree. C., an ethylene/propylene copolymer or a terpolymer, the termonomer thereof being an unsaturated hydrocarbon and the polymer or terpolymer having a molecular weight of 5,000 to 500,000;
- continuing oxidation until the formation of adequate carbonyl groups;
- and then condensing the resulting polymer oxidate with the amine function of a nitrogenous dispersant derived from a dicarboxylic anhydride and a polyamine.
Dependencies are inferred from the claim text.