Patent ID: 7520906

Claim:
A fuel oil composition which comprises a fuel oil having an inherent conductivity of less than 10 pS/m and an additive comprising: (a) a polymethacrylate, polyacrylate or polyfumarate polymer (i) containing an amino or amido group from a copolymerized monomer or (ii) obtained through a transesterification or amidation reaction of the polymer with an aminoalcohol or amine but not prepared from a quaternary ammonium monomer having a number average molecular weight of 1,000 to 10,000,000; and (b) a conductivity improver comprising (i) an olefin polysulfone and (ii) a polymeric polyamine reaction product of epichlorohydrin and an aliphatic primary monoamine or an N-aliphatic hydrocarbyl alkylene diamine, or the sulfonic acid salt of the polymeric polyamine reaction product, or (c) a conductivity improver comprising a 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 1:1 to 10:1, the copolymer having a number average molecular weight of from 800 to 1,000,000.