C?C unsaturated groups were chemically inserted onto TiO2 particles surfaces through chemical reaction of hydroxyl group on the TiO2 fine particle surface with 2,4-diidocyanatotoluene (TDI) first, and then with 2-hydroxyethyl acrylate (HEA). Finally, TiO2 fine particles with surface organic modification were made through the free radical copolymerization reaction with n-butyl acrylate (BA) monomer under UV irradiation. The structure and properties of unmodified and modified TiO2 were studied by FT-IR, XPS, TGA, TEM, lipophilic rates, and adhesion properties tests. The results show that the surface of TiO2 has been successfully introduced with the organic chains through chemical bonding linkage; the surface lipophilic rates of TiO2 particles are increased. The dispersion and compatibility of the modified TiO2 particles in a commercial ink 508C resin greatly improve as compared with that of unmodified TiO2, and agglomeration of particles obviously reduces. The adhesion strength between the white printing ink made from the modified TiO2 particles and BOPP is much better than that from the unmodified TiO2. When the organic rate reached 24.93%, the adhesion strength reaches Grade I. (c) 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011