Patent ID: 7491247

Claim:
A high stability, low emission, invert fuel emulsion composition for an internal combustion engine comprising purified water; hydrocarbon petroleum distillate fuel as the continuous phase of the emulsion; a surfactant package comprising a primary surfactant, a block copolymer stabilizer, and a polymeric dispersant; and a coupling agent for maintaining phase stability at high temperatures and shear pressures in said internal combustion engine wherein said coupling agent is selected from a group consisting of: a di-acid of a Diels-Alder adduct of unsaturated fatty acids and a tri-acid of a Diels-Alder adduct of unsaturated fatty acids neutralized with an alkanolamine to form a water soluble salt; wherein said emulsion has an average droplet size ranging from about 0.1 microns to about 1 micron.