| 摘要 |
PURPOSE:To obtain the titled polymer efficiently, by adding a heat-decomposable initiator and one component of a redox initiator system to an aqueous solution of a cationic monomer, blowing air into the solution, and adding the remaining components of the redox initiator system to initiate the polymerization of the monomer. CONSTITUTION:A heat-decomposable polymerization initiator [e.g., 2,2'-azobis(2- amidinopropane hydrochloride)] and one component of a redox initiator system (e.g., an oxidizing agent component such as an aqueous hydrogen peroxide solution) to an aqueous solution of a cationic monomer (e.g., dimethylaminoethyl methacrylate quaternized with methyl chloride), and air is blown into the solution at a pH of 2-5 to heighten the dissolved oxygen concentration forcibly. The remaining components of the redox polymerization initiator system (e.g., a reducing agent component such as Rongalit) are added, and the solution is cast preferably on an endless belt and polymerized in the presence of atmospheric air to obtain the purpose water-soluble cationic polymer in the form of, for example, a sheet.
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