It was demonstrated that the fast RAFT polymerization of styrene wlth almost pedect polymerization performance could be achieved by using a carefully designed miniemulsion polymerization system．With much higher levels of surfaetant (9 wt％ based on monomer) and co-stabilizer (5 wt％ based on monomer) than those in typical miniemulsion polymerization．the miniemulsion polymerization using 1-phenylethyl phenyl-dithioacetate as a RAFT agent showed a very fast polymerization rate

excellem performance of living radical polymerization during the entire polymerization process

and narrow particle size distributions．It was concluded that RAFT miniemulsion polymerization presented an excellent commercial process for a living radical polymerization system．