METHOD OF PREPARING POLYMETACRYLIC ACID HYDRAZIDE Russian patent published in 2001 - IPC

FIELD: chemical industry. SUBSTANCE: described is method of preparing polymetacrylic acid hydrazide by reacting poly(methyl)methacrylate with hydrazine or hydrazine hydrate while heating in solution. Reaction is carried out on fibrous substrate surface, fibrous substrate being preimpregnated with (methyl)methacrylate and is subsequently polymerized using laser radiation at energy of irradiation of surface ranging from 70 to 500 mW/sq m2? s. Fibrous substrate is polyamide, polyacrylonitrile and polyether fiber. Invention makes it possible to increase acid resistance, permeability of filtering medium from fibrous substrate and also to increase exchange capacity of filtering medium. EFFECT: more efficient preparation method. 2 cl, 3 ex, 1 tbl