| 简介 |
Cationic copolymer prepared by Hoffmann degradation in aqueous solution, comprises reacting alkaline earth hydroxide/hypohalide, on copolymer bases comprising at least a non-ionic co-monomer of acrylamide (and/or methacrylamide), N, N-dimethylacrylamide and/or acrylonitrile, and at least a unsaturated cationic ethylenic co-monomer, comprises a coefficient of desalination (Cd) higher than 0.6, preferably higher than 0.7, with Cd equal to real polymer active material (in wt.%)x density of polymer/value of the conductivity of the solution at 9% of active matter concentration. An independent claim is included for a process of manufacturing a sheet of paper and/or of paperboard and analogues, comprising adding one or more first agent comprising (I), and a second agent corresponding to a (co)polymer having a higher charge density anionic to 0.1 meq/g to the fibrous suspension, separately or in mixture, before formation of the sheet. |
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