Anti-static additive compositions for hydrocarbon fuels

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, wherein the copolymer has an alkylvinyl monomer unit to cationic vinyl monomer unit ratio of from about 1:1 to about 10:1, the copolymer having an average molecular weight of from about 800 to about 1,000,000;
• 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 —(CxH2x)—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 1/9 to about 9/1.

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, wherein the copolymer has an alkylvinyl monomer unit to cationic vinyl monomer unit ratio of from about 1:1 to about 10:1, the copolymer having an average molecular weight of from about 800 to about 1,000,000;
• and
• b) 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 —(CxH2x)—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 1/9 to about 9/1.

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 corresponding to the formula:
• where Z is selected from the group consisting of nitrogen, phosphorus and sulfur, X− is a nonhalogen atom, R is selected from the group consisting of —C(═O)O—, —C(═O)NH—, straight chain and branched alkylene groups, divalent aromatic groups and divalent alicyclic groups, R3 is selected from the group consisting of hydrogen and methyl, R4 is a straight chain or branched alkylene group of up to about twenty carbon atoms, and R5, R6 and R7 are independently each a straight chain or branched alkyl group of up to about twenty carbon atoms, provided however that if Z is sulfur R7 is absent;
• and
• b) 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 —(CxH2x)—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 1/1.

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, wherein the copolymer has an alkylvinyl monomer unit to cationic vinyl monomer unit ratio of from about 1:1 to about 10:1, the copolymer having an average molecular weight of from about 800 to about 1,000,000;
• and
• ii) an anti-static amount of at least one hydrocarbon soluble polysulfone copolymer of at least one olefin and sulfur dioxide.