Dihydrobenzothiophenes as antioxidant and antiwear additives
AssigneeMobil Oil Corporation
InventorsHalou Oumar-Mahamat, Andrew G. Horodysky, Andrew Jeng
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Abstract
Novel dihydrobenzothiophenes prepared via condensation of arylthiols and carbonyl or epoxide containing reagents have been found to be effective antioxidant and antiwear additives in lubricant applications. These additives are made from relatively low cost mercaptans and carbonyl compounds in a one-step high yield reaction.
Claims28
An improved lubricant composition comprising a major proportion of an oil of lubricating viscosity or grease prepared therefrom or an improved fuel composition comprising a major proportion of a liquid hydrocarbon or oxygenated fuel or mixtures thereof and a minor amount of a multifunctional high temperature, antiwear, antioxidant, anticorrosion additive product of reaction prepared by reacting an arylthiol with (a) an aliphatic or an aromatic epoxide or (b) an aromatic or aliphatic aldehyde thereby forming a dihydrobenzothiophene additive condensation product wherein the reaction is carried out at temperatures varying from ambient to about 250.degree. C. under ambient pressure up to 1,000 psi or autogenous pressures for a time sufficient to obtain the desired dihydrobenzothiophene additive product of reaction and wherein the reaction is carried out in molar ratios of reactants varying from equimolar to more than molar to less than molar.
A process of preparing a multifunctional high temperature, antioxidant, antiwear, anticorrosion additive product prepared by reacting an arylthiol with (a) an aliphatic or an aromatic epoxide or (b) an aromatic or aliphatic aldehyde thereby forming a dihydrobenzothiophene additive condensation product wherein the reaction is carried out at temperatures varying from ambient to about 250.degree. C. under ambient pressure up to 1,000 psi or autogenous pressures for a time sufficient to obtain the desired dihydrobenzothiophene additive product of reaction and wherein the reaction is carried out in molar ratios of reactants varying from equimolar to more than molar to less than molar.
A multifunctional high temperature, antioxidant, antiwear, anticorrosion lubricant additive product of reaction prepared by reacting an arylthiol with (a) an aliphatic or an aromatic epoxide or (b) an aromatic or aliphatic aldehyde thereby forming a dihydrobenzothiophene additive condensation product wherein the reaction is carried out at temperatures varying from ambient to about 250.degree. C. under ambient pressure up to 1,000 psi or autogenous pressures for a time sufficient to obtain the desired dihydrobenzothiophene additive product of reaction and wherein the reaction is carried out in molar ratios of reactants varying from equimolar to more than molar to less than molar.
A multifunctional high temperature, antioxidant, antiwear, anticorrosion lubricant additive product of reaction prepared by reacting an arylthiol with (a) an aliphatic or an aromatic epoxide or (b) an aromatic or aliphatic aldehyde wherein the reaction is carried out at temperatures varying from ambient to about 250.degree. C. under ambient pressure up to 1,000 psi or autogenous pressures for a time sufficient to obtain the desired dihydrobenzothiophene additive product of reaction and wherein the reaction is carried out in molar ratios of reactants varying from equimolar to more than molar to less than molar.
A method for improving the high temperature, antiwear, antioxidant, and anticorrosion properties of a major amount of oil of lubricating viscosity or grease prepared therefrom or a fuel composition comprising a major amount of a liquid hydrocarbon or oxygenated fuel or mixtures thereof comprising adding to said oil, grease, or fuel a minor amount of an additive product of reaction prepared by reacting a C.sub.1 to C.sub.200 arylthiol with (a) an aliphatic or an aromatic epoxide or (b) an aromatic or aliphatic aldehyde thereby forming a dihydrobenzothiophene additive condensation product wherein the reaction is carried out at temperatures varying from ambient to about 250.degree. C. under ambient pressure up to 1,000 psi or autogenous pressures for a time sufficient to obtain the desired dihydrobenzothiophene additive product of reaction and wherein the reaction is carried out in molar ratios of reactants varying from equimolar to more than molar to less than molar.
Dependencies are inferred from the claim text.