Patent ID: 8242215
Filing Date: 2012-08-14
Classification: C08F,D21H

Abstract:
1. A cationic copolymer obtained by Hofmann rearrangement in aqueous solution in the presence of an alkali and/or alkaline earth hydroxide and an alkali and/or alkaline earth hypohalide, on a base copolymer comprising: at least 5 mole % of a non-ionic monomer selected from the group consisting of acrylamide; methacrylamide; N,N-dimethylacrylamide; acrylonitrile; and combinations thereof; and at least one comonomer selected from the group consisting of unsaturated cationic ethylenic comonomer; non-ionic comonomer; and combinations thereof; and provided that the non-ionic comonomer is not acrylamide, methacrylamide, N,Ndimethylacrylamide, or acrylonitrile; wherein the cationic copolymer obtained in aqueous solution has a desalination coefficient (Cd) of greater than 0.6, wherein