| 摘要 |
PURPOSE:To obtain a colorless, odorless and transparent quaternarized polystyrene containing little impurities, by dissolving a specific chloromethylated polystyrene polymer in a water-soluble solvent, adding an aqueous solution of trialkylamine or trialkylamine and water separately to the solution, and separating the objective polymer from the aqueous phase after the reaction. CONSTITUTION:A chloromethylated polystyrene polymer having an average molecular weight of >=500 and containing >=10(wt)% chloromethylated styrene and/or >=10% chloromethylated alpha-methylstyrene as monomers, is dissolved in a water-soluble solvent (e.g. acetone), and is made to react with a trialkylamine (e.g. trimethylamine) by adding the trialkylamine in the form of aqueous solution or adding trialkylamine and water separately to the above polymer solution. Trialkylammonium group is introduced into the chloromethyl group by the reaction, and the reaction mixture is left at rest to separate into the aqueous phase and the solvent phase. The objective quaternarized polystyrene is separated from the aqueous phase. USE:Agent for processing paper or synthetic paper. |
