Additive composition having low temperature viscosity corrosion and detergent properties
AssigneeChevron Oronite Company LLC
InventorsJean-Louis Le Coent, Amedee Guellec
Life of this patent
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Abstract
An additive composition providing improved low temperature viscosity, corrosion and detergent properties when used in lubricating oils for internal combustion engines is presented. The additive composition comprises an unsulfurized carboxylate detergent-dispersant additive having been modified by incorporation of from about 3.2 wt % to 7.5 wt %, based on the total additive composition, of an alkaline earth metal salt of a linear, saturated carboxylic acid having from about 16 to about 20 carbon atoms and wherein the additive composition has a superalkalinization ratio of less than about 1.4:1, a TBN of less than about 200 and a sediment value of less than about 0.2 % by volume.
Claims67
An additive composition comprising an unsulfurized carboxylate detergent-dispersant additive having been modified by incorporation of from about 3.2 wt % to 7.5 wt %, based on the total additive composition, of an alkaline earth metal salt of a linear, saturated carboxylic acid having from about 16 to about 20 carbon atoms and wherein the additive composition has a superalkalinization ratio of less than about 1.4:1, a TBN of less than about 200 and a sediment value of less than about 0.2% by volume.
A lubricating oil composition comprising:
- a) a major amount of base oil of lubricating viscosity;
- and
- b) a minor amount of an unsulfurized carboxylate detergent-dispersant additive having been modified by incorporation of from about 3.2 wt % to 7.5 wt %, based on the total additive composition, of an alkaline earth metal salt of a linear, saturated carboxylic acid having from about 16 to about 20 carbon atoms and wherein the additive composition has a superalkalinization ratio of less than about 1.4:1, a TBN of less than about 200 and a sediment value of less than about 0.2% by volume.
A method for producing an unsulfurized carboxylate detergent-dispersant additive having been modified by incorporation of from about 3.2 wt % to 7.5 wt %, based on the total additive composition, of an alkaline earth metal salt of a linear, saturated carboxylic acid having from about 16 to about 20 carbon atoms and wherein the additive composition has a superalkalinization ratio of less than about 1.4:1, a TBN of less than about 200 and a sediment value of less than about 0.2% by volume, said method comprising:
- a) neutralizing one or more hydrocarbyl phenols using an alkaline earth metal base to form an intermediate product,
- b) carboxylating the intermediate product of a) using carbon dioxide so that at least about 5 wt % of the original hydrocarbyl phenol starting material has been converted to alkaline earth single aromatic-ring hydrocarbyl salicylate,
- c) separating at least about 10 wt % of the starting hydrocarbyl phenols from the product obtained in b), and
- d) adding an alkaline earth metal salt of a linear, saturated carboxylic acid having from about 16 to about 20 carbon atoms in the presence of a solvent selected from the group consisting of aromatic hydrocarbons, aliphatic hydrocarbons and monoalcohols to produce the unsulfurized carboxylate detergent-dispersant additive.
A method of improving low temperature viscosity while maintaining corrosion and detergent properties of a lubricating oil composition in an internal combustion engine, said method comprising operating the internal combustion engine with a lubricating oil composition comprising:
- a) a major amount of base oil of lubricating viscosity;
- and
- b) a minor amount of an unsulfurized carboxylate detergent-dispersant additive having been modified by incorporation of from about 3.2 wt % to 7.5 wt %, based on the total additive composition, of an alkaline earth metal salt of a linear, saturated carboxylic acid having from about 16 to about 20 carbon atoms and wherein the additive composition has a superalkalinization ratio of less than about 1.4:1, a TBN of less than about 200 and a sediment value of less than about 0.2% by volume.
Dependencies are inferred from the claim text.