Anti-static additive compositions for hydrocarbon fuels

Abstract

It has been discovered that less expensive, and in some cases synergistically effective anti-static additive blends may be added to hydrocarbon fuels to improve the conductivity thereof. The blend includes an anti-static amount of at least one hydrocarbon soluble copolymer of an alkylvinyl monomer and a cationic vinyl monomer and an anti-static amount of at least one hydrocarbon soluble polysulfone copolymer of at least one olefin and sulfur dioxide. Optional ingredients include polymeric polyamines and aryl sulfonic acids.

1 . A composition having increased electrical conductivity, comprising 
 a) a liquid hydrocarbon;    b) an anti-static amount of at least one hydrocarbon soluble copolymer of an alkylvinyl monomer and a cationic vinyl monomer; and    c) an anti-static amount of at least one hydrocarbon soluble polysulfone copolymer of at least one olefin and sulfur dioxide.    
     
     
         2 . The composition of  claim 1  further comprising d) a polyamine.  
     
     
         3 . The composition of  claim 2  further comprising e) an aryl sulfonic acid.  
     
     
         4 . The composition of  claim 1  further comprising an anti-static amount of at least two hydrocarbon soluble polysulfone copolymers, each of at least one olefin and sulfur dioxide.  
     
     
         5 . The composition of  claim 1  where the weight ratio of copolymer of an alkylvinyl monomer and a cationic vinyl monomer to polysulfone copolymer ranges from about 1:5 to about 2.5:1.  
     
     
         6 . The composition of  claim 1  wherein b) the cationic vinyl monomer is a cationic quaternary ammonium vinyl monomer.  
     
     
         7 . The composition of  claim 1  wherein b) the cationic vinyl monomer is selected from the group consisting of a cationic quaternary ammonium acrylate monomer and a cationic quaternary ammonium methacrylate monomer.  
     
     
         8 . The composition of  claim 1  further comprising a copolymer of an alkyl vinyl monomer and a nitrile-containing monomer.  
     
     
         9 . A composition having increased electrical conductivity, comprising 
 a) a liquid hydrocarbon;    b) an anti-static amount of at least one hydrocarbon soluble copolymer of an alkylvinyl monomer and a cationic vinyl monomer, and    c) an anti-static amount of at least one hydrocarbon soluble polysulfone copolymer of at least one olefin and sulfur dioxide further comprising about 50 mol percent of units from sulfur dioxide, about 40 to 50 mol percent of units derived from one or more 1-alkenes each having from about 6 to 24 carbon atoms, and from about 0 to 10 mol percent of units derived from an olefinic compound having the formula ACH═CHB wherein A is a group having the formula —(C x H 2x )—COOH wherein x is from 0 to about 17, and B is hydrogen or carboxyl, with the proviso that when B is carboxyl, x is 0, and wherein A and B together can be a dicarboxylic anhydride group    where the weight ratio of copolymer of an alkylvinyl monomer and a cationic vinyl monomer to polysulfone copolymer ranges from about 1:5 to about 2.5:1.    
     
     
         10 . The composition of  claim 9  further comprising d) a polyamine.  
     
     
         11 . The composition of  claim 9  further comprising e) an aryl sulfonic acid.  
     
     
         12 . The composition of  claim 9  where in b) the cationic vinyl monomer is a cationic quaternary ammonium vinyl monomer.  
     
     
         13 . The composition of  claim 9  where in b) the cationic vinyl monomer is selected from the group consisting of a cationic quaternary ammonium acrylate monomer and a cationic quaternary ammonium methacrylate monomer.  
     
     
         14 . A composition for improving the anti-static property of a liquid hydrocarbon comprising: 
 a) an anti-static amount of at least one hydrocarbon soluble copolymer of an alkylvinyl monomer and a cationic vinyl monomer, and    b) an anti-static amount of at least one hydrocarbon soluble polysulfone copolymer of at least one olefin and sulfur dioxide.    
     
     
         15 . The composition of  claim 14  further comprising d) a polyamine.  
     
     
         16 . The composition of  claim 14  further comprising e) an aryl sulfonic acid.  
     
     
         17 . The composition of  claim 14  where the weight ratio of copolymer of an alkylvinyl monomer and a cationic vinyl monomer to polysulfone copolymer ranges from about 1:5 to about 2.5:1.  
     
     
         18 . The composition of  claim 14  further comprising a copolymer of an alkyl vinyl monomer and a nitrile-containing monomer.  
     
     
         19 . A method for improving the anti-static property of a liquid hydrocarbon comprising: 
 a) providing a hydrocarbon fuel;    b) adding to the hydrocarbon fuel, in any order: 
 i) an anti-static amount of at least one hydrocarbon soluble copolymer of an alkylvinyl monomer and a cationic vinyl monomer, and  
 ii) an anti-static amount of at least one hydrocarbon soluble polysulfone copolymer of at least one olefin and sulfur dioxide.