The usefulness of the ReactIR(R) reaction analysis system as a powerful tool to in-situ monitor the kinetics of the emulsion polymerization of viny monomers was verified by comparison with the conventional gravimetric method and by checking the rate dependencies on initiator and surfactant concentrations in the emulsion polymerization of butyl methacrylate (BMA). The system was then applied to the kinetic monitoring of emulsion crosslinking copolymerizations of monomethacrylate and dimethacrylate, including methyl methacrylate/ethylene dimethacrylate and BMA/1,6-hexanediol dimethacrylate systems of different hydrophilicities.