Title:
WATER-ABSORBING RESIN PARTICLES, ABSORBENT, AND ABSORBENT ARTICLE
Document Type and Number:
WIPO Patent Application WO/2020/218160
Kind Code:
A1
Abstract:
Water-absorbing resin particles having a gel-layer internal strength, as determined by the following procedure, of 0.8-2.0 N. (1) Prepared is a jig comprising a disk part having front and back flat surfaces with a diameter of 2 cm and having a thickness of 5 mm and a rod part, an end of which has been connected to the center of a first surface of the disk part, which is one of the flat surfaces, the rod part having a circular cross-section with a diameter of 5 mm. Also prepared is a cylindrical vessel containing 176 g of physiological saline and having an inner bottom-surface diameter of 5.7 cm. The jig and the cylindrical vessel are disposed so that the height-direction axis of the cylindrical vessel passes through the center of the disk part. (2) The jig is immersed in the physiological saline so that the second surface of the disk part, which is the flat surface on the reverse side from the first surface, lies below 32 mm from the surface of the physiological saline, and 4.0 g of the water-absorbing resin particles are put into the cylindrical vessel in that state, thereby forming a swollen gel in which the jig has been partly embedded. (3) The jig is pushed down vertically at a speed of 10 cm/min, and a load imposed on the jig at the time when the jig has been pushed down by 6 mm is obtained as the gel-layer internal strength.
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Inventors:
KAWAHARA TORU (JP)
Application Number:
PCT/JP2020/016747
Publication Date:
October 29, 2020
Filing Date:
April 16, 2020
Export Citation:
Assignee:
SUMITOMO SEIKA CHEMICALS (JP)
International Classes:
A61F13/53; C08J3/12; B01J20/26; C08F8/00; C08F20/06; C08L33/02; C08J3/24
Domestic Patent References:
| WO2018159800A1 | 2018-09-07 |
Foreign References:
| JP2016028118A | 2016-02-25 | |||
| JP2016028131A | 2016-02-25 | |||
| JP2016121297A | 2016-07-07 | |||
| JP2016028115A | 2016-02-25 |
Attorney, Agent or Firm:
HASEGAWA Yoshiki et al. (JP)
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