| 摘要 |
<p>Provided are a process for the production of a cross-linked superabsorbent polymer, which has excellent water absorbency and biodegradability, by using an economical maleic acid derivative as a raw material, and a process for the production of a biodegradable, cross-linked superabsorbent polymer by simper reaction steps. A process for the production of a superabsorbent resin, which contains a cross-linked superabsorbent polymer, is also provided. This process comprises the following steps: as step 1, conducting a polymerization reaction and a cross-linking reaction concurrently at 100 to 350 DEG C in a reaction system to produce a cross-linked polymer, and as step 2, subjecting the cross-linked polymer, which has been produced in step 1, to hydrolysis to produce the cross-linked superabsorbent polymer. The reaction system contains (A) at least one monomer selected from the group consisting of (a-1) maleic anhydride and ammonia, (a-2) a dicarboxylic acid having 4 carbon atoms and ammonia, (a-3) a monoammonium salt and/or diammonium salt of a dicarboxylic acid having 4 carbon atoms, (a-4) a monoamide and/or diamide of a dicarboxylic acid having 4 carbon atoms, and (a-5) an imide having 4 carbon atoms, (B) a cross-linking agent, and (C) an acid.</p> |
