Borated hydroxyalkyl esters of alkyl- or alkenylsuccinimide-derived dithiocarbamic acids as multifunctional ashless dispersants
AssigneeMobil Oil Corporation
InventorsAbraham O. M. Okorodudu, Angeline B. Cardis
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Abstract
Borated hydroxyalkyl esters of alkyl- or alkenylsuccinimide-derived dithiocarbamic acids, have been found to be effective multifunctional additives in lubricant and fuel applications.
Claims19
A composition comprising a major proportion of an oil of lubricating viscosity or a grease prepared therefrom and a minor multifunctional amount of an additive product comprising borated derivatives of beta-hydroxyhydrocarbyl esters of alkyl or alkenylsuccinimide-substituted dithiocarbamic acids.
A process for making lubricant additive products of reaction consisting of borated beta-hydroxyhydrocarbyl esters of alkyl or alkenylsuccinimide-substituted dithiocarbamic acids, comprising (1) reacting alkyl- or alkenylsuccinimides with carbon disulfide in the presence of a tertiary amine in an organic solvent to obtain the quaternary amine salt of the correcting succinimide-substituted dithiocarbamic acid;
- (2) reacting the resulting salts with hydrocarbylene oxides to obtain the desired beta-hydroxyhydrocarbyl esters;
- (3) and thereafter borating said esters and wherein the molar ratio of succinic anhydride to polyamine varies from 2 to 1, to 1 to 1 and the molar ratio of carbon disulfide and tertiary amine to succinimide varies from 1 to x per mole of succinimide, x is equal to 1 to 10, under ambient or autogenous pressure at temperatures varying from about 40.degree. C. to about 80.degree. C.
A method of reducing fuel consumption in an internal combustion engine which comprises (1) lubricating said engine with a composition comprising a major proportion of a lubricating oil and a fuel reducing/multifunctional additive amount of a product of reaction obtained by (1) reacting an alkyl- or alkenylsuccinimide with carbon disulfide in the presence of a tertiary amine and an organic solvent, obtaining the quaternary amine salt of the corresponding succinimide-substituted dithiocarbamic acid;
- (2) reacting said salt with a hydrocarbylene oxide to obtain the beta-hydroxyhydrocarbyl esters;
- (3) and thereafter borating said esters and wherein the molar ratio of succinic anhydride to polyamine varies from 2 to 1, to 1 to 1 and the molar ratio of carbon disulfide and tertiary amine to succinimide varies from 1 to x per mole of succinimide, x is equal to 1 to 10, under ambient or autogenous pressure at temperatures varying from about 40.degree. C. to about 80.degree. C.
Dependencies are inferred from the claim text.