Title:
WATER-ABSORBENT RESIN, AND SOIL
Document Type and Number:
WIPO Patent Application WO/2018/159803
Kind Code:
A1
Abstract:
Provided is a water-absorbent resin that quickly absorbs water, even in soil in which a large amount of the water-absorbent resin has been used, that does not easily clump, and that has a high gel swelling volume when water is used to swell the water-absorbent resin. This water-absorbent resin is configured from a polymer of water-soluble ethylenic unsaturated monomers. The physiological-saline absorption capacity of the water-absorbent resin is 40–60 g/g. When a cross-sectional image of the water-absorbent resin is observed by x-ray computed tomography, the fraction of the area of the cross-sectional image that is hollow portions (the hollow area ratio of the cross-sectional image), as calculated on the basis of formula (I), is no more than 10%. (I) Hollow area ratio [%]={total cross-sectional area (B) of hollow portions of the water-absorbent resin/(total cross-sectional area (A) of resin portions of the water-absorbent resin + total cross-sectional area (B) of hollow portions of the water-absorbent resin)}×100%.
Inventors:
CHIBA MIKIHITO (JP)
ONODA YUICHI (JP)
ONODA YUICHI (JP)
Application Number:
PCT/JP2018/007962
Publication Date:
September 07, 2018
Filing Date:
March 02, 2018
Export Citation:
Assignee:
SUMITOMO SEIKA CHEMICALS (JP)
International Classes:
C08F20/06; E02B3/04
Domestic Patent References:
| WO2016111223A1 | 2016-07-14 |
Foreign References:
| JP2014098172A | 2014-05-29 | |||
| JP2007154350A | 2007-06-21 | |||
| JP2003290290A | 2003-10-14 | |||
| JP2003301436A | 2003-10-24 | |||
| JPS61169509A | 1986-07-31 | |||
| JPH03227301A | 1991-10-08 | |||
| GB2267094A | 1993-11-24 | |||
| EP1374919A2 | 2004-01-02 | |||
| JP2006342306A | 2006-12-21 | |||
| EP1637105A1 | 2006-03-22 | |||
| EP0532002A1 | 1993-03-17 |
Other References:
"Modern Superabsorbent Polymer Technology", 1998, WILEY-VCH, article FREDRIC L. BUCHHOLZ, ANDREW T. GRAHAM: "Superabsorbent Polymers", pages: 119, 147-153, 167, 194 - 199, 211-212, 214-217, XP055908235
H HOKOCI: "Application News No.N121 Industrial X-ray Inspection System Observations of Superabsorbent Polymers Using the inspeXio SMX-100CT Microfocus X-Ray CT System", SHIMADZU, JAPAN, 1 May 2013 (2013-05-01), Japan , pages 1 - 2, XP055768069, Retrieved from the Internet [retrieved on 20210122]
See also references of EP 3590980A4
H HOKOCI: "Application News No.N121 Industrial X-ray Inspection System Observations of Superabsorbent Polymers Using the inspeXio SMX-100CT Microfocus X-Ray CT System", SHIMADZU, JAPAN, 1 May 2013 (2013-05-01), Japan , pages 1 - 2, XP055768069, Retrieved from the Internet
See also references of EP 3590980A4
Attorney, Agent or Firm:
TANAKA, Junya et al. (JP)
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