Process for agglomeration of superabsorbent polymer fine particles
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
C08F-020/06
C08C-001/14
B32B-027/00
출원번호
UP-0565577
(2004-07-22)
등록번호
US-7776984
(2010-09-06)
우선권정보
DE-103 34 271(2003-07-25)
국제출원번호
PCT/EP2004/008183
(2004-07-22)
§371/§102 date
20060714
(20060714)
국제공개번호
WO05/012406
(2005-02-10)
발명자
/ 주소
Frank, Markus
출원인 / 주소
Evonik Stockhausen GmbH
대리인 / 주소
Smith Moore Leatherwood LLP
인용정보
피인용 횟수 :
4인용 특허 :
13
초록▼
Among other things, a process for producing an agglomerated superabsorbent polymer particle and an agglomerated superabsorbent polymer particle are disclosed. The process comprises the steps of: (A) bringing superabsorbent polymer fine particles having at least about 40 wt. %, a p
Among other things, a process for producing an agglomerated superabsorbent polymer particle and an agglomerated superabsorbent polymer particle are disclosed. The process comprises the steps of: (A) bringing superabsorbent polymer fine particles having at least about 40 wt. %, a particle size of less than about 150 μm into contact with a fluid comprising to more than about 10 wt. % a cross-linkable, uncrosslinked polymer based on polymerized, ethylenically unsaturated, acid group-bearing monomers or salts thereof; and (B) cross-linking the uncrosslinked polymer by heating the superabsorbent polymer fine particles and the fluid to a temperature from about 20 to about 300° C., so that the cross-linkable, uncrosslinked polymer at least partially crosslinks.
대표청구항▼
The invention claimed is: 1. A process for producing an agglomerated superabsorbent polymer particle comprising more than about 75 wt. % superabsorbent polymer fine particles, said process steps consist of: (A) bringing (i) superabsorbent polymer fine particles having at least about 40 wt. %, based
The invention claimed is: 1. A process for producing an agglomerated superabsorbent polymer particle comprising more than about 75 wt. % superabsorbent polymer fine particles, said process steps consist of: (A) bringing (i) superabsorbent polymer fine particles having at least about 40 wt. %, based on the total weight of the superabsorbent polymer fine particles, a particle size of less than about 150 μm into contact with (ii) a fluid comprising to more than about 10 wt. %, based on the total weight of the fluid, a cross-linkable, uncross-linked polymer, which polymer is based on polymerized, ethylenically unsaturated, acid groups-bearing monomers or salts thereof to at least about 20 wt. %, based on the total weight of the cross-linkable, uncrosslinked polymer; and (B) cross-linking the uncross-linked polymer by heating the superabsorbent polymer fine particles brought into contact with the fluid to a temperature within a range from about 20 to about 300° C., so that the cross-linkable, uncross-linked polymer at least partially crosslinks, wherein (a) the cross-linkable, uncross-linked polymer comprises, besides the polymerized, ethylenically unsaturated, acid groups-bearing monomers, further polymerized, ethylenically unsaturated monomers (M) capable of reacting with polymerized acid group-bearing monomers in a condensation reaction, in an addition reaction, or in a ring opening reaction, and/or (b) the fluid comprises, beside the cross-linkable, uncrosslinked polymer, a crosslinker, and (c) wherein the agglomerated superabsorbent polymer particle has less than about 10 wt. %, based on the total weight of the agglomerated superabsorbent polymer particle, a particle size of less than about 150 μm. 2. A process according to claim 1, wherein the cross-linkable, uncrosslinked polymer comprises a weight average molecular weight of more than about 8000 g/mol. 3. A process according to claim 1, wherein the monomer (M) comprises a polymerized, ethylenically unsaturated conversion product of saturated aliphatic, cycloaliphatic, aromatic alcohols, amines or thiols with ethylenically unsaturated carboxylic acid, carboxylic acid derivatives or allyl halides. 4. A process according to claim 1, wherein the superabsorbent polymer fine particles comprise an inner portion and a surface portion bordering the inner portion, wherein the surface portion comprises a different chemical composition than the inner portion or a different physical property than the inner portion. 5. A process according to claim 1, wherein the bringing into contact of the superabsorbent polymer fine particles with the fluid occurs in the presence of an effect material comprising a polysaccharide or a polyalkylether polyol or a silicon-oxygen-comprising compound or a mixture of at least two thereof. 6. A process according to claim 5, wherein the effect material comprises a zeolite. 7. A process according to claim 1, wherein the bringing into contact occurs in a fluidized bed. 8. A process according to claim 1, wherein during or after step (B) a postcrosslinker is added as a step (C). 9. An agglomerated superabsorbent polymer particle obtained by a process according to claim 1. 10. An agglomerated superabsorbent polymer particle comprising more than about 75 wt. % superabsorbent polymer fine particles, wherein: (A1) the superabsorbent polymer fine particles comprise, at least about 40 wt. % based on the total weight of the superabsorbent polymer fine particles, a particle size of less than about 150 μm and about at least partially onto a matrix of a crosslinked polymer, (A2) wherein the crosslinked polymer comprises at least about 20 wt. %, based on the total weight of the crosslinked polymer, polymerized acid group-bearing monomers or salts thereof, (A3) the crosslinked polymer comprises a different chemical composition than the superabsorbent polymer fine particles or a different physical property than the superabsorbent polymer fine particles, and (A4) wherein less than about 10 wt. % of the agglomerated superabsorbent polymer particle comprises a particle size of less than about 150 μm. 11. An agglomerated superabsorbent polymer particle comprising superabsorbent polymer fine particles having, at least about 50 wt. % based on the total weight of the superabsorbent polymer fine particles, an average particle size of less than about 150 μm and abutting a matrix of a crosslinked polymer, wherein: (B1) the crosslinked polymer comprises at least about 20 wt. %, based on the total weight of the crosslinked polymer, ethylenic acid group-bearing monomers or salts thereof, (B2) the crosslinked polymer comprises a different chemical composition than the superabsorbent polymer fine particles or a different physical property than superabsorbent polymer fine particles, and wherein (B3) the matrix comprises, besides the crosslinked polymer, an effect material comprising a polysaccharide or a polyalkylether polyol or a silicon-oxygen-comprising compound or a mixture of at least two thereof. 12. An agglomerated superabsorbent polymer particle according to claim 9, wherein the superabsorbent polymer fine particles comprise an inner portion and a surface portion bordering the inner portion and wherein the surface portion comprises a different chemical composition from the inner portion or a different physical property from the inner portion. 13. An agglomerated superabsorbent polymer particle according to claim 11, wherein the superabsorbent polymer fine particles comprise an inner portion and a surface portion bordering the inner portion and wherein the surface portion comprises a different chemical composition from the inner portion or a different physical property from the inner portion. 14. The agglomerated superabsorbent polymer particles according to claim 9, wherein the agglomerated superabsorbent polymer particles have at least one of the following properties: a1) a particle size distribution, whereby at least about 80 wt. % of the particles have a particle size within a range of about 20 μm to about 5 mm; a2) a Centrifuge Retention Capacity (CRC) of at least about 5 g/g; a3) an Absorption Against Pressure (AAP) at about 0.7 psi of at least about 5 g/g; a4) a water-soluble polymer content of less than about 25 wt. % after about 16 hours extraction. 15. A composite comprising the agglomerated superabsorbent polymer particles according to claim 9 and a substrate. 16. A process for producing a composite comprising contacting the agglomerated superabsorbent polymer particles according to claim 9 with a substrate. 17. A composite obtained according to the process according to claim 16. 18. The process according to claim 16 further comprising contacting the agglomerated superabsorbent polymer particles according to claim 9 and the substrate with an additive.
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