This paper presents a method for preparation of planar polymeric microstructures by emulsion polymerization using polymerizable branched emulsifier. Planar, oblate and spherical particles can be prepared by changing the volume and functionality of the hydrophobic tail of the comb-like polymerizable emulsifier, together with altering the monomers. Emulsifiers with bulky tails favored the formation of planar microstructure. The polymerizable emulsifiers were immobilized on the latex particles. Hindered desorption of the emulsifier from the latex improved the latexes' stability and facilitate the formation of planar and oblate particles. The polymerization conversion also depends on the molecular characteristics of the emulsifiers and monomers. (c) 2005 Elsevier Ltd. All rights reserved.