FIELD: filtration materials. SUBSTANCE: invention relates to preparing porous polymer membranes and can be used for filtration, analysis, and purification of various media in microbiological and other areas. Aliphatic polyamide is dissolved water-containing formic acid, after which poly-N-vinylamide with molecular weight 2000 to 20000 is added. Resulting solution contains 15-20% polyamide, 13-17% water, and 0.02-0.4% polyvinylamide (the rest being formic acid). Wet formation of this solution gives membrane. EFFECT: increased stability of initial solution and improved structure of membrane. 1 tbl, 8 ex
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