Title:
METHOD FOR PREPARING SUPER-ABSORBENT POLYMER
Document Type and Number:
WIPO Patent Application WO/2020/122444
Kind Code:
A1
Abstract:
The present invention relates to a method for preparing a super-absorbent polymer in which, only through a simple additive post-addition process, the absorption performance of a super-absorbent polymer can be enhanced. The method for preparing a super-absorbent polymer comprises the steps of: forming a hydrogel polymer through crosslinking polymerization of, in the presence of an internal crosslinking agent, water-soluble ethylenically unsaturated monomers having at least partially neutralized acidic groups; drying, pulverizing, and sorting the hydrogel polymer to form base resin powder; additionally crosslinking the surface of the base resin powder in the presence of a surface crosslinking agent to form a surface-crosslinked layer; adding monovalent to trivalent metal cations onto the surface-crosslinked base resin powder at a temperature of 25-80 °C; and maintaining and aging the resulting product to which the metal cations have been added, at a temperature of 40-60 °C for 10-30 minutes.
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Inventors:
SOHN JUNGMIN (KR)
WON TAE YOUNG (KR)
LEE HYEMIN (KR)
WON TAE YOUNG (KR)
LEE HYEMIN (KR)
Application Number:
PCT/KR2019/015776
Publication Date:
June 18, 2020
Filing Date:
November 18, 2019
Export Citation:
Assignee:
LG CHEMICAL LTD (KR)
International Classes:
C08J3/24; C08F20/06; C08F20/26; C08F20/38; C08F20/56; C08J3/12; C08L33/02; C08L33/08; C08L101/14
Domestic Patent References:
| WO2009041727A1 | 2009-04-02 | |||
| WO2011040530A1 | 2011-04-07 |
Foreign References:
| KR20170103849A | 2017-09-13 | |||
| KR20160148986A | 2016-12-27 | |||
| KR20130138851A | 2013-12-19 | |||
| KR20140133470A | 2014-11-19 | |||
| US20120184684A1 | 2012-07-19 | |||
| EP0780424B1 | 2004-05-26 | |||
| US20120058267A1 | 2012-03-08 | |||
| EP0979250B1 | 2004-04-14 | |||
| JP2016131902A | 2016-07-25 |
Other References:
ODIAN: "Principle of Polymerization", 1981, WILEY, pages: 203
REINHOLD SCHWALM: "UV Coatings: Basics, Recent Developments and New Application", 2007, ELSEVIER, pages: 115
BUCHHOLZ FREDRIC L., ANDREW T. GRAHAM: "MODERN SUPERABSORBENT POLYMER TECHNOLOGY ", 1 January 1998, WILEY-VCH, article "MODERN SUPERABSORBENT POLYMER TECHNOLOGY /PASSAGE/", pages: 55-58, 143 - 144, XP093010003
See also references of EP 3770206A4
REINHOLD SCHWALM: "UV Coatings: Basics, Recent Developments and New Application", 2007, ELSEVIER, pages: 115
BUCHHOLZ FREDRIC L., ANDREW T. GRAHAM: "MODERN SUPERABSORBENT POLYMER TECHNOLOGY ", 1 January 1998, WILEY-VCH, article "MODERN SUPERABSORBENT POLYMER TECHNOLOGY /PASSAGE/", pages: 55-58, 143 - 144, XP093010003
See also references of EP 3770206A4
Attorney, Agent or Firm:
YOU ME PATENT AND LAW FIRM (KR)
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