| abstract |
This microemulsion comprises an aqueous continuous phase, an oily phase, a basic surfactant having a lipophilic part and a hydrophilic part, the hydrophilic part comprising an electrostatic charge, and a surfactant co-agent. The viscosity of this microemulsion is increased by addition of a secondary surfactant having a long-chain lipophilic part and a lipophilic charged part capable of reacting with the hydrophilic part of the basic surfactant. From a practical point of view, the formation of the microemulsion is first carried out in the absence of a secondary surfactant and then the addition of the latter. |