S.p.c.m. Sa

Snf Group

Mcpp Innovation LLC

Christophe Auriant

René Hund

Laurent Mialon

Rene Hund

Jérémy Bardin

The present invention relates to a process for the preparation of an aqueous polymer solution containing at least one cationic or amphoteric (co)polymer, comprising the following steps: The invention also concerns the use of this polymer solution as a flocculant, retention and/or drainage agent, and dry strength resistance in a paper manufacturing process.

Aqueous solution of cationic copolymers derived from acrylamide, preparation method and use

Process for manufacturing a sheet of paper and/or board, according to which, in a plant comprising a fan pump and a head box:

Method for manufacturing paper using a cationic polymer obtained by hofmann degradation

Cationic or amphoteric (co)polymer obtained by Hofmann degradation reaction, in aqueous solution, in the presence of an alkaline-earth and/or alkali metal hydroxide and of an alkaline-earth and/or alkali metal hypohalide, on a base (co)polymer comprising at least one nonionic monomer chosen from the group comprising acrylamide (and/or methacrylamide) and N,N-dimethylacrylamide, is characterized in that the base (co)polymer is modified beforehand with at least one polyfunctional compound containing at least 3 heteroatoms chosen from N, S, O and P and each having at least one mobile hydrogen. Use as a flocculation, retention and/or drainage aid, and dry strength aid is contemplated.

Acrylamide-derived cationic copolymers, and uses thereof

In a process for preparing cationic or amphoteric (co)polymers derived from acrylamide by a Hofmann degradation reaction in aqueous solution in the presence of an alkali and/or alkaline-earth metal hydroxide and an alkali metal hypohalide on a base copolymer, a solution of base copolymer on which the reaction is performed contains a polyvalent cationic salt representing at least 0.5% by weight, preferably from 2 to 10% by weight of the base copolymer.

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Saint Etienne, France

Christophe Auriant