| 摘要 |
PURPOSE:To produce a highly water-absorbing polymer in high production efficiency, preventing the deposition of polymer particles in a reactor, by continuously carrying out polymerization reaction, control of water-content and crosslinking steps in individual reactors. CONSTITUTION:The objective highly water-absorbing polymer can be produced by continuously carrying out the following stage using one or more reactors for each stop. (1) A step to produce a slurry containing polymer phase by dissolving a water-soluble vinyl monomer (e.g. acrylic acid and itaconic acid) and a water-soluble polymerization initiator (e.g. potassium persulfate and sodium persulfate) in water, suspending the obtained aqueous solution in a hydrocarbon (e.g. n-pentane and cyclohexane) and subjecting the dispersion to suspension polymerization. (2) A step to remove water in the polymer phase of the slurry together with the hydrocarbon from the system. (3) A step to add a water-soluble crosslinking agent to the slurry containing the polymer phase and carry out crosslinking reaction in the polymer phase.
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