FIELD: production of polymers. SUBSTANCE: method is carried out by interaction of aqueous solution of acryl amide polymer having concentration at least 2 mass % with salt of hydroxyl amine, molar ratio of hydroxyl amine and amide groups in said acryl amide polymer being 0.1-2.0:1. Reaction takes place within 1-4 h at 40-80 C, pH being at least 11. Molecular weight of origin polymer (e. g. acryl amide) is 5•104-15•106. EFFECT: improves efficiency of method. 2 cl, 7 tbl
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