A novel cyclic-amine monomer, 1-acryloyl-2,2,5,5-tetramethylimidazolidin-4-one (ACTMIO), was synthesized in a good yield through the reaction of acryloyl chloride with 2,2,5,5-tetramethylimidazolidin-4-one and was fully characterized with Fourier transform infrared and H-1 NMR studies. ACTMIO was copolymerized with several widely used acrylic and vinyl monomers under ordinary conditions. In the presence of triallyl-1,3,5-triazine-2,4,6(1H,3H,5H)-trione, ACTMIO was easily grafted onto most textile fabrics. After regular chlorine bleach treatment, N-halamine derivatives of the corresponding polymeric materials exhibited antibacterial properties against Escherichia coli, and these properties were durable and refreshable with chlorine bleaching. The relationship between the structures and antibacterial properties of the samples is further discussed.