METHOD FOR PRODUCING HIGH-MOLECULAR POLYVINYLPYRROLIDONE AND THE COPOLYMER OF N-VINYLPIRROLIDONE AND N-VINYLIMIDAZOLE Russian patent published in 2018 - IPC C08F2/46 C08F26/10 C08F126/10 C08F226/10 

FIELD: chemistry.

SUBSTANCE: present invention relates to a process for producing high molecular weight polyvinylpyrrolidone and a copolymer of N-vinylpyrrolidone and N-vinylimidazole by radiation polymerization of an aqueous solution of N-vinylpyrrolidone or an aqueous solution of N-vinylpyrrolidone in a mixture with N-vinylimidazole at a predetermined pH range. Moreover, radiation polymerization of an aqueous solution of N-vinylpyrrolidone is carried out at its concentration in an aqueous solution of 9–11 % or radiation polymerization of an aqueous solution of N-vinylpyrrolidone in a mixture with N-vinylimidazole at a weight ratio of 1.00:0.85, respectively, and a total concentration of 9–11 % by weight, when adjusting the pH in the range of 7.5–8.5 by the introduction of an aqueous solution of potassium salt of pyrrolidine-2-carboxylic acid and a total radiation dose of 1.4–2.7 kGy. Technical result is the preparation of homogeneous aqueous solutions of high-molecular polyvinylpyrrolidone and a copolymer of N-vinylpyrrolidone and N-vinylimidazole with a Brookfield viscosity of 85–200 Pz and a weight average molecular weight of 2.9–4.5 MDa.

EFFECT: obtaining homogeneous aqueous solutions of high molecular weight polyvinylpyrrolidone and a copolymer of N-vinylpyrrolidone and N-vinylimidazole.

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