Aqueous emulsion dispersion of thermoplastic elastomer and process for preparing the same

The present invention provides an aqueous emulsion dispersion widely applicable and capable of providing excellent properties even when used by mixing into other conventional emulsions used for many utilities. The aqueous emulsion dispersion has improved stability over time and mechanical stability, and when used as an asphalt modifier, the aqueous emulsion dispersion can be easily mixed and dissolved into hot asphalt or asphalt emulsion and can improve flow resistance, toughness and low temperature flexibility of asphalt without losing workability. The present invention also relates to a process for preparing the aqueous emulsion dispersion. The aqueous emulsion dispersion of thermoplastic elastomer is obtained by emulsifying and dispersing a thermoplastic elastomer by using three different kinds of surfactant of a nonionic surfactant, an anionic surfactant and a cationic surfactant.