PARTICULATE WATER ABSORBING AGENT AND METHOD FOR PRODUCTION THEREOF, AND WATER ABSORBING ARTICLE

Title:

PARTICULATE WATER ABSORBING AGENT AND METHOD FOR PRODUCTION THEREOF, AND WATER ABSORBING ARTICLE

Document Type and Number:

WIPO Patent Application WO/2005/075070

Kind Code:

A1

Abstract:

A particulate water absorbing agent being prepared by the surface crosslinking treatment of a water absorbing resin having a crosslinked structure, characterized in that (i) a mass average particle diameter (D50) is 200 to 600 μm and particles having a diameter of not less than 150 and less than 850 μm account for 95 to 100 wt % of the total particles, (ii) a logarithmic standard deviation (&sgr &zgr ) of its particle size distribution is 0.25 to 0.45, (iii) a degree of compression is 0 to 18 %, and (iv) a surface tension of a supernatant liquid being obtained four minutes after the dispersion of 0.5 g of said particulate water absorbing agent into 50 ml of a physiological saline solution at 20°C is 55 mN/m or more. The particulate water absorbing agent exhibits high fluidity in a dry state, while retaining high absorbing capability, and can be free from blocking, caking and the sticking to an apparatus or the like, and, when the absorbing agent is contacted with a liquid to be absorbed, the liquid is less prone to reduction of the surface tension, and further, the absorbing agent exhibits enhanced fluidity and bulk density without detriment to absorbing characteristics.

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WO/2001/032117	IMPROVED SUPERABSORBENT COMPOSITION AND ABSORBENT ARTICLE USING THE SAME
WO/1999/011302	A PRESSURE SENSITIVE ADHESIVE COMPOSITION
JP2012097276	POWDERY CROSSLINKED ABSORBENT POLYMER ABSORBING AQUEOUS LIQUID AND BLOOD, METHOD FOR PRODUCING THE SAME, AND USE OF THE SAME

Inventors:

DAIROKU YORIMICHI
ADACHI YOSHIFUMI
NOGI KOZO
INOUE HIROKI
WADA KATSUYUKI
IRIE YOSHIO

Application Number:

PCT/JP2005/001689

Publication Date:

August 18, 2005

Filing Date:

February 04, 2005

Export Citation:

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Assignee:

NIPPON CATALYTIC CHEM IND (JP)
DAIROKU YORIMICHI
ADACHI YOSHIFUMI
NOGI KOZO
INOUE HIROKI
WADA KATSUYUKI
IRIE YOSHIO

International Classes:

A61L15/60; B01J20/26; C08J3/24; (IPC1-7): B01J20/26; A61F13/53; A61L15/60; C08K5/00; C08L101/14

Foreign References:

JP2002035580A	2002-02-05
JP2000290381A	2000-10-17
JPH10114801A	1998-05-06
JPH05156034A	1993-06-22
JPS6158658A	1986-03-25

Other References: