pe pp based non woven fabric was irradiated with an electron beam of 200 kgy under a nitrogen atmosphere and a dry ice temperature condition acrylonitrile dmso tween80 and ammonium molybdophosphate were mixed with a weight ratio 50 50 0 8 0 1 to obtain a monomer solution as ammonium molybdophosphate is not completely soluble into dmso the contents in the containers used in the subsequent processes were well stirred so that ammonium molybdophosphate may be well dispersed in dmso and that ammonium molybdophosphate may be moved preferably to the container to be used in the subsequent process the irradiated pe pp based non woven fabric was made contact to the monomer solution bubbled with nitrogen gas and this contact process was applied for twenty four hours at 60 u00b0 c the non woven fabric so obtained as to hold ammonium molybdophosphate was immersed in toluene and then washed after washed in toluene the non woven fabric holding ammonium molybdophosphate so obtained as described above was dried by a vacuum drier after air drying in the draft pe pp based non woven fabric was irradiated with an electron beam of 200 kgy under a nitrogen atmosphere and a dry ice temperature condition acrylonitrile dmso tween80 and ammonium molybdophosphate were mixed with a weight ratio 50 50 0 8 2 5 to obtain a monomer solution as ammonium molybdophosphate is not completely soluble into dmso the contents in the containers used in the subsequent processes were well stirred so that ammonium molybdophosphate may be well.