The possibility of obtaining high-solids-content microlatexes was investigated. It was found that, for the semicontinuous copolymerization of methylmethacrylate and butylacrylate coagulum-free 45.20% solid content latexes can be obtained through microemulsion polymerization using Dowfax 2A-1 surfactant. The effect of the amount of surfactant, type of cosurfactant, type and concentration of initiator and temperature on solid content was studied. The chemical, freeze-thaw, storage and mechanical stabilities of the latexes were determined.