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AssigneeBardahl Manufacturing Corporation
InventorsHugh A. McNeil, Arthur J. Kiehn, Mark Eskridge
Estimating the term…
Improved performance of two-cycle and four-cycle engines is achieved by adding to the oil or fuel of such engines a composition that contains a copolymer of an alpha-olefin and a dialkyl fumarate or maleate and/or a synthetic diester compound that has about 30 carbon atoms. For two-cycle engines, the composition preferably contains both chemicals, in addition to an octane booster such as methylcyclopentadienyl manganese tricarbonyl. For four-cycle engines, the composition contains at least one of the copolymer and diester, in addition to a molybdenum or bismuth salt, dimercapto 1,3,4-thiadiazole and sulfur-phosphorous EP and/or chlorinated paraffin. The composition can also act to improve gear and grease lubrication and provide improved lubricity to fuels.
A lubricating composition for a two-cycle internal combustion engine, comprising an ester copolymer and a diester, wherein the ester copolymer has a viscosity of about 100-700 mm2/s at 100° C.
The composition of claim I wherein the diester has a structure which is formed by esterification of a dihydric alcohol of the formula HO—C2-14—OH with a monocarboxylic acid.
A lubricating composition for a two-cycle internal combustion engine, comprising an ester copolymer and a diester, wherein the composition has a volume ratio of copolymer to diester in the range of 1:1 to 1:4, and wherein the diester has a structure which is formed by esterification of a dicarboxylic acid of the formula HOOC—C2-10—COOH with a monohydric alcohol.
A synthetic lubricating composition (SLC), comprising an ester copolymer of an alpha olefin and a diester selected from a dialkyl fumarate and a dialkyl maleate, and a diester having two ester groups, wherein the ester copolymer has a viscosity of about 100-700 mm2/s at 100° C., and wherein the ester copolymer and/or the diester having two ester groups is/are in a total concentration of 2-10 volume percent based on the volume of synthetic lubricant composition.
A synthetic lubricating composition (SLC), comprising an ester copolymer of an alpha olefin and diester selected from a dialkyl fumarate and a dialkyl maleate, and a diester having two ester groups, wherein the composition has a volume ratio of copolymer to diester having two ester groups in the range of 1:1 to 1:4, wherein the ester copolymer and/or the diester having two ester groups is/are in a total concentration of 2-10 volume percent based on the volume of synthetic lubricant composition, and wherein the diester has the structure which is formed by esterification of a dicarboxylic acid of the formula HOOC—C2-10—COOH with a monohydric alcohol.
Dependencies are inferred from the claim text.