Method for producing water absorbent resin particle
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
C08J-003/12
B29B-017/00
출원번호
US-0296808
(2007-09-28)
등록번호
US-9593212
(2017-03-14)
우선권정보
JP-2006-267567 (2006-09-29)
국제출원번호
PCT/JP2007/069516
(2007-09-28)
§371/§102 date
20081010
(20081010)
국제공개번호
WO2008/038840
(2008-04-03)
발명자
/ 주소
Sakamoto, Shigeru
Irie, Yoshio
Ikeuchi, Hiroyuki
Nagasawa, Makoto
Ishizaki, Kunihiko
Machida, Sayaka
출원인 / 주소
Nippon Shokubai Co., Ltd.
대리인 / 주소
Cesari and McKenna LLP
인용정보
피인용 횟수 :
0인용 특허 :
25
초록▼
The present invention provides a method for producing a water absorbent resin particle, in high productivity, not only in a controlled manner of particle size but also enhancing fundamental property (absorption capacity or absorption capacity against pressure) of a water absorbent resin. A method fo
The present invention provides a method for producing a water absorbent resin particle, in high productivity, not only in a controlled manner of particle size but also enhancing fundamental property (absorption capacity or absorption capacity against pressure) of a water absorbent resin. A method for producing a water absorbent resin particle having the cross-linking polymerization step for an aqueous solution of an unsaturated monomer; the grain refining step for water-swellable, water-containing gel-like cross-linked polymer (a) obtained in the cross-linking polymerization step; the drying step for grain refined gel; and the crushing step for a dried substance, wherein, in the grain refining step for the water-swellable, water-containing gel-like cross-linked polymer (a), water-swellable, water-containing gel-like cross-linked polymer (b), having solid content or centrifuge retention capacity different from solid content or centrifuge retention capacity of the cross-linked polymer (a) by equal to or larger than 1%, is subjected to coexistence.
대표청구항▼
1. A method for producing a water absorbent resin particle, the method comprising: subjecting an aqueous solution of acrylic acid or a salt thereof to cross-linking polymerization to produce a water-swellable, water-containing cross-linked polymer (a) having a centrifuge retention capacity and a sol
1. A method for producing a water absorbent resin particle, the method comprising: subjecting an aqueous solution of acrylic acid or a salt thereof to cross-linking polymerization to produce a water-swellable, water-containing cross-linked polymer (a) having a centrifuge retention capacity and a solid content;adding a water-swellable, water-containing crosslinked polymer (b) to the water-swellable, water-containing cross-linked polymer (a) to form a mixture;grain refining the mixture in a grain refining apparatus to produce a grain refined gel;drying the grain refined gel to yield a dried substance; andpulverizing the dried substance,wherein the water-swellable, water-containing cross-linked polymer (b) has a centrifuge retention capacity different from the centrifuge retention capacity of the cross-linked polymer (a); the solid content of the water-swellable, water-containing cross-linked polymer (a) is 40 - 80% by weight; the solid content of the water-swellable, water-containing cross-linked polymer (b) is 0.1 - 5% by weight; and a surface cross-linking step is performed by using a surface cross-linking agent after the drying step. 2. The method according to claim 1, wherein the grain refining apparatus is a screw extruder. 3. The method according to claim 1, wherein the solid content of a mixture of the water-swellable, water-containing cross-linked polymers (a) and (b) is from 40 to 60% by weight. 4. The method according to claim 1, wherein the water-swellable, water-containing cross-linked polymer (b) is obtained by recycling of the production of a water absorbent resin. 5. The method according to claim 1, wherein the water-swellable, water-containing cross-linked polymer (b) is obtained from a polymer gel in a cross-linking polymerization step. 6. The method according to claim 1, wherein the water-swellable, water-containing cross-linked polymer (b) is obtained by the addition of water to a water absorbent resin particle subjected to a classification step. 7. The method according to claim 1, wherein the water-swellable, water-containing cross-linked polymer (b) is obtained by washing a production apparatus of a water absorbent resin with water. 8. The method according to claim 1, wherein the surface cross-linking agent is selected from the group consisting of ethylene glycol diglycidyl ether, ethylene glycol, propylene glycol, butanediol, ethylene carbonate, polyethylene imine, polyamide amine-epichlorohydrin, and a combination thereof. 9. The method according to claim 1, wherein a solid content of a mixture of the water-swellable, water-containing cross-linked polymer (a) and the water-swellable, water-containing cross-linked polymer (b) is 45 - 55% by weight. 10. The method according to claim 1, wherein a difference in the centrifuge retention capacity between the water-swellable, water-containing cross-linked polymer (a) and the water-swellable, water-containing cross-linked polymer (b) is 1 to 20 g/g. 11. The method according to claim 1, wherein a residence time of a mixture of the water-swellable, water-containing cross-linked polymer (a) and the water-swellable, water-containing cross-linked polymer (b) inside the grain refining apparatus is not more than 25 seconds.
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이 특허에 인용된 특허 (25)
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Brandt Kerryn A. (Cincinnati OH) Goldman Stephen A. (Wyoming OH) Inglin Thomas A. (West Chester OH), Hydrogel-forming polymer compositions for use in absorbent structures.
Harada Nobuyuki,JPX ; Ishizaki Kunihiko,JPX ; Fujimaru Hirotama,JPX ; Kitayama Toshimasa,JPX, Pressure-resistant absorbent resin, disposable diaper using the resin, and absorbent resin, and method for production thereof.
Sutton Tod A. (Midland MI) Jacob Karl V. (Midland MI) Lim Timothy (Midland MI) Sandor Steven P. (Midland MI), Process and apparatus for recycling aqueous fluid absorbents fines.
Woodrum Guy T. (Chesapeake VA) Majette Thomas H. (Portsmouth VA), Process for the conversion of fine superabsorbent polymer particles into larger particles.
Dahmen Kurt (Mnchengladbach-Rheydt DEX) Mertens Richard (Dahlerdyk DEX) Brehm Helmut (Dachsstrasse DEX), Process for the production of water-swellable products using superfines of water-swellable polymers.
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