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AssigneeNippon Shokubai Co., Ltd.
InventorsNobuyuki Harada, Yoshihiro Motono, Shigeru Sakamoto, Toshimasa Kitayama
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This invention concerns an absorbent composite a supporting member and a cationic absorbent polymer and anionic absorbent polymer particles fixed to the supporting member. This absorbent composite excels in absorbing capacity under pressure, vertical aspiration power, and flexibility and suffers only sparing exfoliation of an absorbent polymer. This invention further concerns an absorbent composite which contains an absorbent polymer in an amount of at least 30% by weight based on the total weight of the absorbent composite and, after absorbing a liquid, shows a value of not less than 3 for the expansion anisotropy specified by the following formula. Expansion anisotropy=(Ez/Ex+Ez/Ey)/2 (wherein Ex, Ey, and Ez respectively represent coefficient of liner expansion in the directions of X axis, Y axis, and Z axis) and an absorbent article using the absorbent composite. This invention permits production of a novel absorbent composite which suffers no leakage and excels in water absorbing power, water retaining power, and flexibility and an absorbent article using the absorbent composite.
An absorbent composite comprising a supporting member a cross-linked cationic absorbent polymer fixed to said supporting member and cross-linked anionic absorbent polymer particles fixed to said cross-linked cationic absorbent polymer through an ionic bond.
An absorbent composite according to any of claims 1-3, wherein said supporting member is a fibrous substance.
An absorbent composite in the shape of a sheet having a volume of at least 5 cm.sup.3, a thickness of not less than 0.2 mm, and a density in the range of 0.3-1.1 g/cm.sup.3 and exhibiting a vertical aspiration power of not less than 5 cm, an absorbing capacity under pressure of not less than 20 g/g, and Gurley stiffness of not more than 1000 mgfN.
An absorbent composite containing at least 30% by weight of absorbent polymer based on the total weight of said absorbent composite, wherein said absorbent composite, on absorbing a liquid, shows a value of not less than 3 for the expansion anisotropy specified by the following formula:
Dependencies are inferred from the claim text.