Cationic copolymer prepared by Hoffmann degradation in aqueous solution, useful as e.g. coagulation

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The invention relates to cation copolymers of acrylamide obtained by reaction of degradation known as of Hoffmann, using a hydroxide the alkaline-earth one and of a hypohalogénure the alkaline-earth one, and the use of these copolymers mainly like agents of resistance for the paper and/or agents of coagulation the copolymers are characterized by a coefficient of desalination (Cd) higher than 0, 6, preferably higher than 0, 65, advantageously higher than 0, 7.