Title:
METHOD FOR PRODUCING SECONDARILY DEHYDRATED HIGHLY-WATER-ABSORBENT POLYMER FOR HIGHLY-WATER-ABSORBENT RECYCLED POLYMER, AND METHOD FOR PRODUCING HIGHLY-WATER-ABSORBENT RECYCLED POLYMER
Document Type and Number:
WIPO Patent Application WO/2023/007871
Kind Code:
A1
Abstract:
The purpose of the present disclosure is to provide a method which is for producing a secondarily dehydrated highly-water-absorbent polymer for a highly-water-absorbent recycled polymer, and by which a highly-water-absorbent recycled polymer having a small residual amount of waste can be simply formed. The production method according to the present disclosure has the following feature. A method for producing a secondarily dehydrated highly-water-absorbent polymer for a highly-water-absorbent recycled polymer is characterized by comprising: a preparation step for preparing a primarily dehydrated highly-water-absorbent polymer which is obtained by immersing a sanitary article-forming material, which forms a sanitary article, in an acid-containing aqueous solution that contains an acid to form the primarily dehydrated highly-water-absorbent polymer, and separating the primarily dehydrated highly-water-absorbent polymer from the sanitary article-forming material; and a secondary dehydration step for forming a secondarily dehydrated highly-water-absorbent polymer by bringing the primarily dehydrated highly-water-absorbent polymer into contact with a polyvalent metal ion supply source that can supply polyvalent metal ions to further dehydrate the primarily dehydrated highly-water-absorbent polymer.
Inventors:
KONISHI TAKAYOSHI (JP)
SUZUKI KAZUMITSU (JP)
MORITA EIJI (JP)
HASEGAWA SHIMPEI (JP)
SUZUKI KAZUMITSU (JP)
MORITA EIJI (JP)
HASEGAWA SHIMPEI (JP)
Application Number:
PCT/JP2022/016919
Publication Date:
February 02, 2023
Filing Date:
March 31, 2022
Export Citation:
Assignee:
UNICHARM CORP (JP)
SDP GLOBAL CO LTD (JP)
SDP GLOBAL CO LTD (JP)
International Classes:
B29B17/00; B01J20/26; B01J20/34
Foreign References:
| JP2016000881A | 2016-01-07 | |||
| JP2015086483A | 2015-05-07 | |||
| JP2019135046A | 2019-08-15 | |||
| JP2013198862A | 2013-10-03 | |||
| JP2015004034A | 2015-01-08 | |||
| JP2015120834A | 2015-07-02 | |||
| JP2019135046A | 2019-08-15 | |||
| JP2015004034A | 2015-01-08 |
Other References:
"Handbook of Electrochemistry"
Attorney, Agent or Firm:
AOKI, Atsushi et al. (JP)
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