Title:
PRODUCTION METHOD FOR CROSS-LINKED POLYMER PARTICLES, PRODUCTION METHOD FOR WATER-ABSORBENT RESIN PARTICLES, AND METHOD FOR IMPROVING WATER ABSORPTION UNDER LOAD
Document Type and Number:
WIPO Patent Application WO/2021/049466
Kind Code:
A1
Abstract:
A production method for cross-linked polymer particles that are to be further cross-linked to produce water-absorbent resin particles 10a. The production method comprises a crushing step for crushing a cross-linked polymer that has a structural unit that is derived from an ethylenic unsaturated monomer. When the static absorbed water retention capacity of the cross-linked polymer is the amount of absorbed water per 1 g of the cross-linked polymer after physiological saline has been absorbed into the cross-linked polymer and then the cross-linked polymer has been centrifuged, the ratio of the static absorbed water retention capacity of the cross-linked polymer after the cross-linked polymer is crushed in the crushing step to the static absorbed water retention capacity of the cross-linked polymer before the cross-linked polymer is crushed is at least 1.5, and the static absorbed water retention capacity of the cross-linked polymer after the cross-linked polymer is crushed is at least 30 g/g.
Inventors:
NISHIDA MOE (JP)
Application Number:
PCT/JP2020/033832
Publication Date:
March 18, 2021
Filing Date:
September 07, 2020
Export Citation:
Assignee:
SUMITOMO SEIKA CHEMICALS (JP)
International Classes:
C08J3/12; C08J3/24
Domestic Patent References:
| WO2016204302A1 | 2016-12-22 | |||
| WO2018135629A1 | 2018-07-26 |
Foreign References:
| JP2019524944A | 2019-09-05 | |||
| JP2010242011A | 2010-10-28 | |||
| JP2018030991A | 2018-03-01 |
Attorney, Agent or Firm:
HASEGAWA Yoshiki et al. (JP)
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