Two-stage latexes of polystyrene acrylates

The modification of decomposition rate of the potassium persulfate initiato r during the synthesis of "two-stage latexes": polystyrene-ethyl acrylate ( EtA) of butyl acrylate (BuA) and of 2-ethylhexyl acrylate (EHA) is studied. This rate is minimum for BuA and maximum for EHA in good agreement with th e value of solubility parameters. The appearance of polyacrylates determine s the existence of water bonded to the polar polymer. The amount of water b onded increases in the sequence PEtA>PBuA>PEHA function of the modification of the diameters of the particles resulted from the latexes obtained.