Different start-up strategies for the 55 wt% solids content redox-initiated emulsion copolymerization of vinyl acetate and Veova 10 in a continuous loop reactor were studied to determine the optimal start-up procedure in terms of smoothness of the operation and minimum out-of-specification product. These strategies included different initial charges and temperature profiles. The evolutions of the monomer conversion, particle size, number of polymer particles and molecular weight distribution during the start-up were analysed and the effect of the start-up procedure on the steady-state values of these variables determined.