Synergistic combinations for use in functional fluid compositions
AssigneeExxon Chemical Patents Inc.
InventorsGeorge M. Tiffany, Rolfe J. Hartley, Antonio Gutierrez, Emil J. Meny
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Abstract
The present invention provides functional fluid compositions containing a major portion of oil of lubricating viscosity and a novel and synergistic combination of an acylated nitrogen-containing compound having an olefinic substituent averaging in carbon number from 20 to 60 and at least one ashless detergent/dispersant.
Claims6
A lubricant-fuel mixture wherein the fuel is lead-free, the mixture containing 1 part lubricant to about 25-100 parts fuel where the lubricant is a two-cycle lubricating oil composition comprising a major amount of a lubricating oil and a combination of two dispersants:
- (a) the first dispersant being present in an amount of 1-20 vol. % based upon the total volume of the lubricating oil and being a polyisobutenyl succinimide wherein the polyisobutenyl has an Mn of 650-750;
- and (b) 1-15 vol. % of another dispersant being a basic nitrogen compound selected from the group consisting of succinimides, carboxylic acid amides, hydrocarbyl monoamines, hydrocarbyl polyamines, Mannich bases, phosphoramides, thiophosphoramides, phosphonamides, and dispersant viscosity index improvers.
Dependencies are inferred from the claim text.