Method for producing water-absorbent polymer particles with improved properties
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
C08F-006/00
C08J-003/24
A61L-015/60
A61L-015/22
A61L-015/24
A61L-015/42
출원번호
US-0407490
(2013-06-21)
등록번호
US-9840598
(2017-12-12)
우선권정보
EP-12174828 (2012-07-03)
국제출원번호
PCT/EP2013/063030
(2013-06-21)
국제공개번호
WO2014/005860
(2014-01-09)
발명자
/ 주소
Bauduin, Christophe
Daniel, Thomas
Karim, Asif
출원인 / 주소
BASF SE
대리인 / 주소
Marshall, Gerstein & Borun LLP
인용정보
피인용 횟수 :
0인용 특허 :
20
초록▼
The present invention relates to a process for producing water-absorbing polymer particles having an improved profile of properties, comprising thermal surface postcrosslinking in the presence of a salt of a polyvalent metal cation and a complexing anion and subsequent aftertreatment, the aftertreat
The present invention relates to a process for producing water-absorbing polymer particles having an improved profile of properties, comprising thermal surface postcrosslinking in the presence of a salt of a polyvalent metal cation and a complexing anion and subsequent aftertreatment, the aftertreatment comprising coating with a salt of a polyvalent metal cation and a non-complexing anion, and remoisturization with further drying.
대표청구항▼
1. A process for producing water-absorbing polymer particles comprising polymerizing a monomer solution or suspension comprising a) at least one ethylenically unsaturated monomer which bears an acid group and may be at least partly neutralized,b) at least one crosslinker,c) at least one initiator,d)
1. A process for producing water-absorbing polymer particles comprising polymerizing a monomer solution or suspension comprising a) at least one ethylenically unsaturated monomer which bears an acid group and may be at least partly neutralized,b) at least one crosslinker,c) at least one initiator,d) optionally one or more ethylenically unsaturated monomer copolymerizable with the monomer mentioned under a) ande) optionally one or more water-soluble polymer,drying, grinding, and classifying a resulting polymer gel, and thermally surface postcrosslinking the classified polymer particles withf) at least one covalent surface postcrosslinker, andg) at least one salt of a polyvalent metal cation and a complexing acid anion selected from the group consisting of glycolate, glycinate, lactate, alanate, citrate, tartrate, tartronate, and glycerate,which comprises subsequently aftertreating the surface postcrosslinked polymer particles, the aftertreatment comprisingi) coating with at least one salt of a polyvalent metal cation and a non-complexing acid anion selected from the group consisting of formate, acetate, propionate, methylsulfonate, sulfate, and chloride,ii) increasing the moisture content by 1 to 150% by weight, andiii) drying after the increase in the moisture content. 2. The process according to claim 1, wherein step ii) is conducted before step i). 3. The process according to claim 1, wherein the classified polymer particles are coated with 0.02 to 0.8% by weight of the polyvalent metal cation. 4. The process according to claim 1, wherein the surface postcrosslinked polymer particles are coated with 0.02 to 0.8% by weight of the polyvalent metal cation. 5. The process according to claim 1, wherein the polyvalent metal cation is selected from the group of Al3+, Ti4+, and Zr4+. 6. The process according to claim 1, wherein the surface postcrosslinked polymer particles, after increasing the moisture content, are dried at a temperature of less than 150° C. 7. The process according to claim 1, wherein the surface postcrosslinked polymer particles, after increasing the moisture content, are dried down to a moisture content of less than 10% by weight. 8. The process according to claim 1, wherein the water-absorbing polymer particles have a centrifuge retention capacity of at least 15 g/g.
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