Cyclic N-halamine biocidal polymer compounds and methods of using the samewherein the functional groups halogenated hydantoins,triazine diones, imidazolidinones, and pyrimidinones are substituted ontoinexpensive polymer units such as polystyrene, polyethylene, andmodified polymethacrylamide are provided. These N-halamine polymers arestable, insoluble biocides which release only small amountsof free halogen and other impurities. They will be useful as disinfectants forpotable water, swimming pools, hot tubs, industrial watersystems, cooling towers, air-conditioning systems, gas streams, paints, oils,ointments, fabrics, sterile bandages, coatings, hard surfaces,liners of containers, and the like.
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