Abstract: Stable fluoroacrylate copolymer emulsion in the size range of 110—150 nm was made by miniemulsion polymerization under employment of low dose of emulsifiers and no coemulsifiers, with fluoroacrylate(FA), butyl methylacrylate(BMA), methyl methyl-acrylate(MMA) as the monomers. The molecular weight and composition of copolymer were demonstrated by GPC, FTIR and ¹H NMR, the change of latex partical sizer in the polymerization process was determined, and the surface property of films was studied by Wilhelmy method. It is shown that mixed monomer species allows efficient copolymerization to occur, and products with a high conversion of fluoromonomer(95%) and narrow molecular weight distribution(1.3—1.5) were obtained, and the polymer particles were found to be one-to-one copy of the monomer droplets and drop nucleation was the dominant mechanism in the polymerization process, some properties of fluoroacrylate copolymer latex of miniemulsion were improved, the excellent water and oil repellency of the copolymer film without coemulsifiers influence were preserved while the amount of fluorinated compounds required in the polymer is reduced considerably.

Key words: Fluoroacrylate, Miniemulsion polymerization, Ternary copolymer, Low surface energy