Pour point depressant additive for fuels and lubricants
AssigneeExxon Research & Engineering Co.
InventorAlbert Rossi
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Abstract
An oil-soluble copolymer, useful as a pour point depressant for lubricating oils, is composed of about equimolar amounts of 1-olefins and maleic anhydride, said 1-olefins being a mixture comprising from about 25 to 75, preferably 30 to 55, mole percent of straight chain C.sub.20 -C.sub.24 1-olefins and from about 25 to 75, preferably 45 to 70, mole percent of C.sub.10 -C.sub.14 1-olefins. These useful copolymers are oil-soluble, essentially free of olefinic unsaturation and have a number average molecular weight of from 1,000 to 30,000. Pour point depressant activity of said copolymers is enhanced by esterification with a C.sub.1 to C.sub.8 alcohol, e.g. 2-ethyl hexanol. The copolymers are usefully admixed with lubricants in an amount of from 0.01 to 3 wt. % based on the total weight of the admixture.
Claims3
A lubricating oil composition comprising, a major proportion of a mineral lubricating oil, and a pour point depressing amount of about 0.01 to 3.0 wt. % of an oil-soluble pour point depressing copolymer of 1,000 to 30,000 number average molecular weight consisting essentially of about equimolar proportions of maleic anhydride and 1-olefin, said 1-olefin being a mixture comprising from about 25 to 75 mole percent of a straight chain higher olefin and from about 25 to 75 mole percent of a lower olefin, said higher olefin having in the range of 20 to 24 carbon atoms and said lower olefin having 10 to 14 carbon atoms.
Dependencies are inferred from the claim text.