[NH4+].[OH-].Cl.C(N)=C.[CH:7]([N:9]1[CH2:13][CH2:12][CH2:11][C:10]1=[O:14])=[CH2:8].C(N)=C>O>[CH:7]([N:9]1[CH2:13][CH2:12][CH2:11][C:10]1=[O:14])=[CH2:8].[CH:7]([NH:9][CH:10]=[O:14])=[CH2:8]
20 g of N-vinylpyrrolidone and 2 g of N-vinylformamide were polymerized in 120 ml of water, to which 1 ml of NH4OH solution was added, at 80° C. under a blanket of argon. Initiator α,α'-azoisobutyronitrile 110 mg, polymerization time 24 h. 145 ml of concentrated hydrochloric acid were added to the resulting aqueous copolymer solution, and the mixture was refluxed (110° C.) for 7 h. The mixture was subsequently worked up as described in A using a strongly basic ion exchanger. 160 g of aqueous solution of an N-vinylamine/N-vinylpyrrolidone copolymer with an N-vinylamine content of 5.7% by weight were then obtained. The solids content of the polymer solution was 9.53%, the pH was 10.1, and the reduced viscosity of the polymer was determined as 1.61 dl/g (measured on a 1% strength solution in H2O at 25° C.).
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