Continuous emulsion polymerizations of vinyl acetate were carried out at 50 C in a single continuous stirred-tank reactor using sodium lauryl sulfate as emulsifier and potassium persulfate as initiator. It was found that (1) the so-called limit cycles could take place in monomer conversion, the number of polymer particles and the molecular weight of polymers produced under certain operating conditions, (2) the time-average steady-state monomer conversion was proportional to the 0.31 power of the emulsifier concentration in the feed, to the 0.50 power of the initiator concentration, to the -1.0 power of the monomer concentration, and to the 0.90 power of the mean residence time, and (3) the time-average steady-state number of polymer particles produced was proportional to the 2.1 power of the emulsifier concentration in the feed, to the -0.80 power of the initiator concentration, to the 0 power of the monomer concentration, and to the -0.92 power of mean residence time.