FILTERING NONWOVEN MATERIAL Russian patent published in 2001 - IPC

FIELD: textile industry. SUBSTANCE: nonwoven material is composed of fibrous fabric manufactured from anion-exchange modified polyamide filament fastened by needle stitching method, and is further provided with anion-exchange polycaproamide filament based on grafted copolymer of polycaproamide and polydiethylamine methacrylate used in an amount of 40-60 wt.%. Nonwoven material has improved acid gas protective properties due to increased static exchange capacitance and full dynamic exchange capacitance, and may be used for manufacture of filtering members for gas trapping installations. EFFECT: increased efficiency by improved protective properties. 1 tbl, 3 ex