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

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United States of America Patent

PATENT NO 9725532
APP PUB NO 20160311940A1
SERIAL NO

15104018

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Abstract

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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:

    Hofmann degradation reaction on a (co)polymer based on at least one non-ionic monomer chosen from the group including acrylamide, methacrylamide, N,N-dimethylacrylamide, and acrylonitrile;post-processing of the resulting aqueous polymer solution of viscosity V1;characterized in that the post processing comprises the following successive steps:obtaining of an aqueous polymer solution containing at least one cationic or amphoteric (co)polymer derived from the Hofmann degradation reaction;post-processing of this aqueous polymer solution;characterized in that the post processing comprises the following successive steps: (a) adjustment of the pH of the aqueous polymer solution to a value greater than or equal to 5.5;(b) decrease of the pH of the aqueous polymer solution to a value between 2 and 5.

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Patent Owner(s)

Patent OwnerAddress
S P C M SAZAC DE MILIEUX ANDREZIEUX BOUTHEON F-42160

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Auriant, Christophe Saint Etienne, FR 5 20
Hund, René Villars, FR 16 47
Mialon, Laurent Saint Galmier, FR 4 7

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