Lubricant for two-stroke cycle engines

Abstract

A lubricant composition adapted for a two stroke cycle engine comprises 5 wt. % to 35 wt. % of an oil of lubricating viscosity, greater than 50 wt. % to 90 wt. % of a hydrocarbon solvent and at least one additive selected from (i) a dispersant and (ii) a friction modifier.

1 . A lubricating composition comprising:
 (a) 5 to 35 wt. % of an oil of lubricating viscosity;   (b) 50 to 90 wt. of a hydrocarbon solvent; and   (c) at least one additive selected from (i) a dispersant and (ii) a friction modifier.   
     
     
         2 . The lubricating composition of  claim 1 , wherein the composition comprises a friction modifier and a dispersant. 
     
     
         3 . The lubricating composition of  claim 2 , comprising from about 0.2 to 10 wt. %, of the dispersant. 
     
     
         4 . The lubricating composition of  claim 2 , wherein the dispersant is selected from a phenolic-type dispersant, a Mannich-type dispersant or a succinimide-type dispersant or mixtures thereof. 
     
     
         5 . The lubricating composition of  claim 2 , wherein the dispersant comprises:
 (a) a Mannich-type dispersant; and   (b) a succinimide-type dispersant.   
     
     
         6 . The lubricating composition of  claim 2 , wherein the dispersant further comprises a phenolic-type dispersant. 
     
     
         7 . The lubricating composition of  claim 2 , wherein the dispersant is ashless. 
     
     
         8 . The lubricating composition of  claim 2 , wherein the weight percent ratio of dispersant to oil of lubricating viscosity is 1:6 to 1:2.5. 
     
     
         9 . The lubricating composition of  claim 1 , comprising from 0.1 to 5 wt. % of a friction modifier. 
     
     
         10 . The lubricating composition of  claim 1 , wherein the friction modifier comprises at least one of fatty phosphites, fatty acid amides, fatty epoxides, borated fatty epoxides, fatty amines, glycerol esters, borated glycerol esters, alkoxylated fatty amines, borated alkoxylated fatty amines, metal salts of fatty acids, sulfurized olefins, fatty imidazolines, condensation products of carboxylic acids and polyalkylene-polyamines, amide, ester or imide derivatives of hydroxy-carboxylic acids, metal salts of alkyl salicylates, amine salts of alkylphosphoric acids and mixtures thereof. 
     
     
         11 . The lubricating composition of  claim 1 , wherein the friction modifier is an ash-free friction modifier and is substantially free of ash containing friction modifier. 
     
     
         12 . The lubricating composition of  claim 1 , wherein the friction modifier is an ash-containing friction modifier and is substantially free of ash-free friction modifier. 
     
     
         13 . The lubricating composition of  claim 1 , wherein the friction modifier is an ester, amide or imide derivative of an alpha-hydroxy carboxylic acid. 
     
     
         14 . The lubricating composition of  claim 1  further comprising a detergent. 
     
     
         15 . The lubricating composition of  claim 1 , wherein the detergent is an ash containing detergent and is substantially free of ash-free detergent. 
     
     
         16 . The lubricating composition of  claim 1 , wherein the detergent is an ashless detergent and is substantially free of ash containing detergent. 
     
     
         17 . The lubricating composition of  claim 1 , wherein the detergent is present in an amount from 0.01 to 5 wt. %. 
     
     
         18 . The lubricating composition of  claim 1 , having an ash content of less than 2000 ppm. 
     
     
         19 . The lubricating composition of  claim 1 , wherein the lubricating composition is substantially free of ash. 
     
     
         20 . The lubricating composition of  claim 1 , having a sulfur content of less than 500 ppm. 
     
     
         21 . The lubricating composition of  claim 1 , wherein the composition is substantially free of sulfur. 
     
     
         22 . The lubricating composition of  claim 1  wherein the oil of lubricating viscosity comprises a Group IV or V base oil or mixture thereof. 
     
     
         23 . The lubricating composition of  claim 1 , wherein the oil of lubricating viscosity comprises a synthetic ester oil. 
     
     
         24 . The lubricating composition of  claim 1 , wherein the hydrocarbon solvent is selected from the group consisting of aromatic type hydrocarbon solvents, aliphatic type hydrocarbon solvents, naphthenic type hydrocarbon solvents and blends thereof. 
     
     
         25 . The lubricating composition of  claim 1 , wherein the hydrocarbon solvent comprises a naphthenic type hydrocarbon solvent. 
     
     
         26 . The lubricating composition of  claim 1 , wherein the hydrocarbon solvent comprises an aromatic type hydrocarbon solvent. 
     
     
         27 . The lubricating composition of  claim 1 , wherein the hydrocarbon solvent comprises an aliphatic type hydrocarbon solvent. 
     
     
         28 . A method of lubricating an engine comprising a combustion chamber, the method comprising the step of supplying to the combustion chamber a lubricating composition of  claim 1 . 
     
     
         29 . The method of  claim 28 , wherein the engine is a two-cycle engine. 
     
     
         30 . The method of  claim 28 , wherein the lubricating composition is admixed with a major amount of a liquid fuel composition, and the resulting admixture is supplied to the combustion chamber. 
     
     
         31 . The method of  claim 30 , wherein the lubricating composition is admixed with the liquid fuel composition at a ratio of 1:200 to 1:25 by volume. 
     
     
         32 . The method of  claim 31 , wherein the ratio of the oil of lubricating viscosity to liquid fuel in the admixture is 1:125 to 1:500. 
     
     
         33 . The method of  claim 26 , wherein the engine comprises a carburetor. 
     
     
         34 . The method of  claim 26 , wherein a portion of the lubricating composition is supplied to the combustion chamber by direct injection, port fuel injection, or throttle body injection. 
     
     
         35 . The method of  claim 26 , wherein the engine has a peak power output of about 10 horsepower (7.46 kW) 
     
     
         36 . A combustible mixture for fueling a two-cycle engine comprising a lubricating composition admixed with a liquid fuel composition at a ratio of 1:60 to 1:40 by volume, wherein the lubricating composition comprises:
 a. from 5 wt. % to 35 wt. % of an oil of lubricating viscosity;   b. from 60 wt. % to 90 wt. of a hydrocarbon solvent;   c. from 0.02 wt. % to 10 wt. % of a dispersant;   d. from 0.1 wt. % to 5 wt. % of at least one friction modifiers; and   e. optionally, a detergent.   
     
     
         37 . The combustible mixture of  claim 36 , wherein the dispersant comprises
 (a) a Mannich-type dispersant; and   (b) a succinimide-type dispersant.   
     
     
         38 . The combustible mixture of  claim 36 , wherein the weight percent ratio of dispersant to oil of lubricating viscosity is 1:6 to 1:2.5. 
     
     
         39 . The combustible mixture of  claim 36 , wherein the ratio of the oil of lubricating viscosity to liquid fuel in the admixture is 1:125 to 1:500 by volume. 
     
     
         40 . A method of fueling a two-cycle engine comprising a combustion chamber, the method comprising the step of supplying to the combustion chamber a combustible mixture of  claim 36 .