Additive and fuel compositions

Abstract

An additive composition, on use in a fuel in a spark-ignition internal combustion engine, controls the formation of sludge and piston varnish. When used in a direct injection spark-ignition internal combustion engine, particulate emissions and deposit formation on intake valves may also be controlled. When used in a port fuel injection spark-ignition internal combustion engine, the port fuel injection valve deposits may be reduced. The additive composition comprises a polyalkylene amine and a hydrocarbyl-substituted hydroxyaromatic compound. The additive compositions may be present in a fuel composition.

1 - 12 . (canceled) 
     
     
         13 . An additive composition for use in a fuel for a spark-ignition internal combustion engine or a compression-ignition gasoline internal combustion engine, said additive composition comprising:
 about 5% to about 55% by weight of a polyalkylene amine, said polyalkylene amine comprising a polyalkylene group that exhibits a number average molecular weight of from about 700 to about 1500; and   about 3% to about 25% by weight of a hydrocarbyl-substituted hydroxyaromatic compound, said hydrocarbyl-substituted aromatic compound comprising a hydrocarbyl group that exhibits a number average molecular weight of from about 700 to about 1500 and has up to about 60 mol % vinylidene terminal groups.   
     
     
         14 . The additive composition of  claim 13 , where said additive composition comprises:
 about 5% to about 25% by weight of a polyether carrier fluid.   
     
     
         15 . The additive composition of  claim 13 , wherein the hydrocarbyl-substituted aromatic compound is a Mannich Base additive. 
     
     
         16 . The additive composition of  claim 13 , wherein the polyalkylene amine is a polyisobutylene amine. 
     
     
         17 . The additive composition of additive composition of  claim 13 , wherein the hydrocarbyl substituent of the aromatic compound is or comprises polyisobutylene. 
     
     
         18 . The additive composition of  claim 13 , wherein the weight ratio of actives of the polyalkylene amine : the hydrocarbyl-substituted aromatic compound is in the range of from about 5:1 to about 1:5. 
     
     
         19 . The additive composition of  claim 13 , wherein the a polyether carrier fluid is used at weight ratio of actives of the polyether carrier fluid : the combination of the polyalkylene amine and the hydrocarbyl-substituted aromatic compound is greater than about 1:2. 
     
     
         20 . The additive composition of  claim 13 , wherein the polyalkylene amine comprises a polyalkylene group having at least about 60 mol % vinylidene terminal groups. 
     
     
         21 . A fuel composition for use in a spark-ignition internal combustion engine or a compression-ignition gasoline internal combustion engine, said fuel composition comprising:
 about 50 ppm to about 300 ppm by weight of a polyalkylene amine, said polyalkylene amine comprising a polyalkylene group that exhibits a number average molecular weight of from about 700 to about 1500; and   about 20 ppm to about 200 ppm by weight of a hydrocarbyl-substituted hydroxyaromatic compound, said hydrocarbyl-substituted aromatic compound comprising a hydrocarbyl group that exhibits a number average molecular weight of from about 700 to about 1500 and has up to about 60 mol % vinylidene terminal groups.   
     
     
         22 . The fuel composition of  claim 21 , wherein said fuel composition comprises:
 about 20 ppm to about 300 ppm polyether carrier fluid.   
     
     
         23 . The fuel composition of  claim 21 , wherein the hydrocarbyl-substituted aromatic compound is a Mannich Base additive. 
     
     
         24 . The fuel composition of  claim 21 , wherein the polyalkylene amine is a polyisobutylene amine. 
     
     
         25 . The fuel composition of  claim 21 , wherein the hydrocarbyl substituent of the aromatic compound is or comprises polyisobutylene. 
     
     
         26 . The fuel composition of  claim 21 , wherein the weight ratio of actives of the polyalkylene amine:the hydrocarbyl-substituted aromatic compound is in the range of from about 5:1 to about 1:5. 
     
     
         27 . The fuel composition of  claim 21 , wherein the a polyether carrier fluid is used at weight ratio of actives of the polyether carrier fluid:the combination of the polyalkylene amine and the hydrocarbyl-substituted aromatic compound is greater than about 1:2. 
     
     
         28 . The fuel composition of  claim 21 , wherein the polyalkylene amine comprises a polyalkylene group having at least about 60 mol % vinylidene terminal groups. 
     
     
         29 . An additive composition, which additive composition, on use in a fuel in a spark-ignition internal combustion engine, controls the formation of sludge and piston varnish; and which additive composition, when used in a direct injection spark-ignition internal combustion engine, controls particulate emissions and deposit formation on intake valves; and which additive composition, when used in a port fuel injection spark-ignition internal combustion engine, reduces the port fuel injection valve deposits. 
     
     
         30 . A fuel composition containing the additive composition of  claim 29 .