| Nowadays, it is known that hollow polymer particle has great value in use and developing potential in the areas of building coatings, paper coatings and domestic products. The up-to-date developing use is to be the display particle which is not moving in display cell for electrophoretic display. The preparation in osmotic swelling and the application performances of hollow latex particle in electrophoretic display ware mainly discussed in this study.The method of emulsion polymerization was adopted by using methyl methacrylate, butyl acrylate and methacrylic acid as the monomers in this study, and the average diameter of the prepared seed polymer was 72.1nm. Then the core was prepared by the method of seed emulsion polymerization with average diameter of about 400nm, using methyl methacrylate and methacrylic acid as the monomers and sodium persulfate as the reaction initiator. The dropping rate of monomer was controlled to 1 drop per 20s, and the mass ratio of seed and core was about 1:10～1:15.The particles with core-shell structure can be prepared using styrene and butyl acrylate as the monomers under the initiator systems of thermal process and redox respectively. Then hollow particle of 900nm were produced by swelling of all the core-shell particle with the average diameter of 650nm, with 10% NaOH as swelling agent, and the styrene and butyl acrylate mass ratio in shell monomer of 7:3.The favorable mass percent of acid monomer in shell monomer was about 40~50%. The process of swelling was promoted by small amount of acid monomer in shell monomer, while stopped by excessive amount of cross-linking agent. It was indicated by the electrophoretic cell that the particle has charge in water phase, which is not electrophoretic in oil phase and could be encapsulated by microcapsule. The pattern, size and structure of the polymer particle prepared during each step were characterized by AFM, SEM, TEM, optical microscope, IR and dynamic scatting lighting.
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