| 摘要 |
Water-soluble cationic polyquaternary ammonium graft copolymers are prepared by graft polymerizing (a) one or more water-soluble vinyl monomers onto (b) a water-soluble cationic polyquaternary ammonium polymer which contains hydroxyalkylene groups. (a) is typically acrylamide, optionally mixed with acrylic acid, dimethyl diallyl ammonium chloride and/or dimethyl aminoethyl methacrylate methosulphate. (b) contains units of -A-CH2- CH(OH).CH2-A- where A is tertiary or quaternary nitrogen, and is typically the quaternized reaction product of epichlorhydrin with N,N,N',N'- tetramethylethylene diamine and optionally methylamine. The polymers are useful as flocculants, dry strength additives for paper, and retention agents. |
