Methylmethacrylate and 2-hydroxyethylmethacrylate were polymerized in oil-in-water microemulsions that were stabilized by cetyltrimetylammonium bromide (CTAB). Microemulsions that prepared changed continuously from transparent microemulsions to turbid emulsions by increasing the HEMA weight percentage as a comonomer. Polymerization was initiated with an oil-soluble initiator, azobisizobutyronitrile (AIBN). Stable P(MMA-HEMA) latexes were obtained about 40 nm in diameter. Molecular weights of the copolymers were in the range of 1.89-2.03 x 10(6). The glass transition temperatures of these copolymers, which were obtained by differential scanning calorimeter, were in the range of 95-99 degreesC. The comonomer ratio in the final copolymers were obtained from the nuclear magnetic resonance spectra, which were smaller than the comonomer ratios used in the original recipes.