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US 2003/0224949 A1Published application
Reduced color molybdenum-containing composition and a method of making same
AssigneeChevron Oronite Company LLC
InventorsWilliam R. Ruhe JR., Anatoli Onopchenko
Life of this patent
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Abstract
Antioxidant additives for lubricating oils are prepared by reacting an acidic molybdenum compound or salt thereof and a basic nitrogen compound where the temperature of the process does not exceed 120° C., resulting in a product color that is light in intensity.
Claims28
A process for preparing a low color intensity, oil-soluble molybdenum containing composition comprising:
- (a) reacting an acidic molybdenum compound or salt thereof and a basic nitrogen compound selected from the group consisting of succinimides, carboxylic acid amides, hydrocarbyl monoamines, hydrocarbon polyamines, Mannich bases, phosphonoamides, thiophosphonamides, phosphoramides, dispersant viscosity index improvers, and mixtures thereof, to form a molybdenum complex wherein the temperature of the reaction is maintained at or below about 120° C.;
- and
- (b) subjecting the product of (a) to at least one stripping or sulfurization step or both, wherein the temperature of the reaction mixture in the stripping or sulfurization step is maintained at or below about 120° C. for a period of time sufficient to provide an oil-soluble molybdenum containing composition having an absorbance intensity of less than 0.7 at a wavelength of 350 nanometers as measured in a one centimeter path-length quartz cell in a UV-Visible spectrophotometer by diluting the molybdenum containing composition with isooctane to a constant molybdenum concentration of 0 00025 grams of molybdenum per gram of the diluted molybdenum containing composition
A process for preparing a low color intensity, oil-soluble molybdenum containing composition comprising:
- (a) reacting an acidic molybdenum compound or salt thereof and a basic nitrogen compound selected from the group consisting of succinimides, carboxylic acid amides, hydrocarbyl monoamines, hydrocarbon polyamines, Mannich bases, phosphonoamides, thiophosphonamides, phosphoramides, dispersant viscosity index improvers, and mixtures thereof, to form a molybdenum complex wherein the temperature of the reaction is maintained at or below about 120° C.,
- (b) stripping the product of (a) at a temperature at or below about 120° C.;
- and
- (c) sulfurizing the resulting product at a temperature at or below 120° C. and wherein the sulfur to molybdenum molar ratio is about 1:1 or less for a period of time sufficient to provide an oil-soluble molybdenum containing composition having an absorbance intensity of less than 0 7 at a wavelength of 350 nanometers as measured in a one centimeter path-length quartz cell in a UV-Visible spectrophotometer by diluting the molybdenum containing composition with isooctane to a constant molybdenum concentration of 0 00025 grams of molybdenum per gram of the diluted molybdenum containing composition.
1 more element
Dependencies are inferred from the claim text.