In recent years nanomaterials have been increasingly used in improving the properties of all types of materials. The prerequisite for achieving good properties of the nanocomposite is the homogeneous dispersion of nano fillers in the polymer matrix. In this work, polyacrylate (PA) emulsions and PA/TiO2 emulsions were synthesized by in situ emulsion polymerization and emulsion prepared ex situ by mixing neat PA emulsions and titanium dioxide fillers (TiO2) in TiO2 concentration range 0.5-2.0 % by mass of monomer. Two types of colloidal dispersion TiO2 (CCR 200 Mn and CCR 150) were used for the synthesis. The characterization of the emulsion was focused on the determination of zeta potentials, particle size distribution, run time, density, pH values and rheological properties. From the obtained zeta potential results, it is apparent that all PA/TiO2 emulsions are stable since the zeta potential of measured emulsions is ≤ -30 mV. For all of the examined emulsions the particle size is of nanometer sizes with narrow and single-mode distribution. The largest particles are in pure PA matrices and by addition of TiO2 fillers for systems prepared by in situ polymerization the size of composite particles is continuously decreased. For samples prepared by ex situ mode of preparation it is apparent that the particle size curves for the PA/TiO2 emulsions are almost identical to the distribution curves for the pure PA matrix. The run time is gradually increasing with increasing TiO2 concentration in PA/TiO2 emulsions. Addition of TiO2 fillers slightly increases the density of polyacrylate emulsions. The density of the polyacrylate aqueous emulsion ranges from 1.05 to 1.08 g/cm^-3. From the results of the rheological properties of in situ polymerization, it is apparent that the filler addition significantly influences the rheological properties of the PA emulsion. The results of non-Newtonian behavior in PA/TiO2 emulsions were analyzed by the Ostwald de Waele model which proved to be suitable for describing the rheological behavior of the PA/TiO2 system.