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US 2006/0217274 A1Published application
Lubricant and concentrate compositions comprising hindered-phenol-containing diester antioxidant and method thereof
AssigneeThe Lubrizol Corporation
InventorsJason Brown, Jonathan Vilardo, Virginia Carrick, William Abraham, Paul Adams
Life of this patent
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Abstract
A lubricant and concentrate composition comprises a hindered-phenol-containing diester antioxidant derived from a hydrocarbyl diol or an amide diol. A method for improving the performance of a lubricant composition, especially a lubricant composition for an internal combustion engine, comprises the antioxidant.
Claims19
A lubricant composition, comprising:
- (A) a major amount of an oil of lubricating viscosity;
- (B) a minor amount of at least one hindered-phenol-containing diester antioxidant wherein said antioxidant is formed from a 3-(3,5-di-t-alkyl-4-hydroxyphenyl)propionic acid or a reactive equivalent thereof and a diol selected from the group consisting of (1) a hydrocarbon diol compound, (2) an amide diol compound formed from a monoamine or a polyamine having at least one primary or secondary amino group and a dihydroxy-containing monocarboxylic acid or a reactive equivalent thereof, and (3) mixtures thereof;
- and
- (C) a minor amount of at least one other additive selected from the group consisting of viscosity modifiers, pour point depressants, dispersants, detergents, antiwear agents, antioxidants that are different from component (B), friction modifiers, corrosion inhibitors, seal swell agents, metal deactivators, foam inhibitors, and mixtures thereof.
1 more element
A concentrate composition, comprising:
- (A) a concentrate-forming amount of an oil of lubricating viscosity;
- (B) at least one hindered-phenol-containing diester antioxidant wherein said antioxidant is formed from a 3-(3,5-di-t-alkyl-4-hydroxyphenyl)propionic acid or a reactive equivalent thereof and a diol selected from the group consisting of (1) a hydrocarbon diol compound, (2) an amide diol compound formed from a monoamine or a polyamine having at least one primary or secondary amino group and a dihydroxy-containing monocarboxylic acid or a reactive equivalent thereof, and (3) mixtures thereof, and
- (C) at least one other additive selected from the group consisting of viscosity modifiers, pour point depressants, dispersants, detergents, antiwear agents, antioxidants that are different from component (B), friction modifiers, corrosion inhibitors, seal swell agents, metal deactivators, foam inhibitors, and mixtures thereof.
A method of operating an internal combustion engine, comprising:
- (A) supplying to said engine a lubricant comprising:
- (i) an oil of lubricating viscosity;
- (ii) at least one hindered-phenol-containing diester antioxidant wherein said antioxidant is formed from a 3-(3,5-di-t-alkyl-4-hydroxyphenyl)propionic acid or a reactive equivalent thereof and a diol selected from the group consisting of (1) a hydrocarbon diol compound, (2) an amide diol compound formed from a monoamine or a polyamine having at least one primary or secondary amino group and a dihydroxy-containing monocarboxylic acid or a reactive equivalent thereof, and (3) mixtures thereof;
- and
- (iii) a minor amount of at least one other additive selected from the group consisting of viscosity modifiers, pour point depressants, dispersants, detergents, antiwear agents, antioxidants that are different from component (ii), friction modifiers, corrosion inhibitors, seal swell agents, metal deactivators, foam inhibitors, and mixtures thereof.
2 more elements
Dependencies are inferred from the claim text.