| 摘要 |
PURPOSE: A water absorbent material having high water absorbency regardless of an acidic anhydropolyamino acid having a low molecular weight, a method for producing the same, and a water absorbent article using the water absorbent material are provided. CONSTITUTION: The water absorbent material comprises, as a main component, a water absorbent resin which has a structure in which an anhydropolyamino acid having an ethylenically unsaturated double bond represented by formula I is grafted with polysaccharides, wherein at least a portion of the anhydropolyamino acid is hydrolyzed, and crosslinked, and wherein the water absorbent resin is obtained by reacting an anhydropolyamino acid having an ethylenically unsaturated double bond (A) with polysaccharides (B), crosslinking the reaction product with a crosslinking agent (C), and hydrolyzing at least a portion of constituent components of the anhydropolyamino acid. In a method for producing a water absorbent material comprising a water absorbent resin as a main component, the method comprises reacting an anhydropolyamino acid having an ethylenically unsaturated double bond (A) with polysaccharides (B), crosslinking the reaction product with a crosslinking agent (C), and hydrolyzing at least a portion of constituent components of the anhydropolyamino acid. In a water absorbent article comprising a liquid permeable sheet, a liquid impermeable sheet, and a water absorber containing a water absorbent material and a fiber material, the water absorbent article is formed between the liquid permeable sheet and the liquid impermeable sheet, wherein the water absorbent material used is a water absorbent material comprising, as a main component, a water absorbent resin which has a structure in which an anhydropolyamino acid having an ethylenically unsaturated double bond (A) is grafted with polysaccharides, wherein at least a portion of the anhydropolyamino acid is hydrolyzed and crosslinked. In the formula I, R1 represents at least one functional group selected from the group consisting of amino groups, epoxy groups, carboxyl groups, carbodiimide groups, oxazoline groups, imino groups, and isocyanate groups, Q represents an alkylene group having 1 to 10 carbon atoms, and R2 represents hydrogen or an alkyl group having 1 to 4 carbon atoms.
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