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AssigneeSumitomo Seika Chemicals Co., Ltd.
InventorsMasayoshi Handa, Yuichi Onoda, Koji Ueda
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Object The main object of the present invention is to provide a water-absorbent resin having a suitable particle size, strong particle strength, excellent adhesion to fibers, and excellent flowability as powders as well as properties suitable for a water-absorbent material used in a hygienic material, such as excellent general absorption properties as a water-absorbent resin, and to provide a process for producing the same. Another object of the present invention is to provide an absorbent material and an absorbent article using the water-absorbent resin. Means for Achieving the Object A water-absorbent resin having an aspect ratio of 1.0 to 3.0 and a median particle size (D) of 100 to 2,000 μm in which primary particles having an aspect ratio of 1.1 to 200 and a median particle size (d) of 50 to 600 μm are agglomerated.
A water-absorbent resin in the form of a secondary particle in which primary particles having an aspect ratio of 1.1 to 200 and a median particle size (d) of 50 to 600 μm are agglomerated,
A method for producing a water-absorbent resin comprising a secondary particle according to a reversed phase suspension polymerization method including steps 1 and 2 described below:
Dependencies are inferred from the claim text.