Water-absorbing polymers having interstitial compounds, a process for their production, and their use
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
C08F-020/06
C08F-020/00
C08G-077/04
C08G-077/00
출원번호
US-0076770
(2002-02-14)
발명자
/ 주소
Brehm,Helmut G.
Harren,Jorg
Mertens,Richard
출원인 / 주소
Stockhausen GmbH
대리인 / 주소
Smith Moore LLP
인용정보
피인용 횟수 :
2인용 특허 :
10
초록
The invention relates to absorbents for water and aqueous liquids, which absorbents are based on water-swellable, yet water-insoluble polymers wherein zeolites high in silicon have been incorporated ionically and/or as a result of mechanical inclusion.
대표청구항▼
What is claimed is: 1. An absorbent, crosslinked polymer for water or aqueous body fluids, based on optionally partially neutralized, monoethylenically unsaturated monomers bearing acid groups, wherein the absorbent, crosslinked polymer has zeolites high in silicon at least partially bound ionicall
What is claimed is: 1. An absorbent, crosslinked polymer for water or aqueous body fluids, based on optionally partially neutralized, monoethylenically unsaturated monomers bearing acid groups, wherein the absorbent, crosslinked polymer has zeolites high in silicon at least partially bound ionically thereto or incorporated therein and wherein the zeolites have a silicon dioxide/aluminum oxide ratio greater than 20. 2. The absorbent, crosslinked polymer according to claim 1, wherein the polymer comprises at least 0.01 to 10 wt.% of zeolites high in silicon. 3. An absorbent, crosslinked polymer for water or aqueous body fluids, based on optionally partially neutralized, monoethylenically unsaturated monomers bearing acid groups, wherein the absorbent, crosslinked polymer has at least 0.01 to 10 wt. % of zeolites high in silicon that are at least partially bound ionically thereto or incorporated therein, and wherein the absorbent, crosslinked polymer has at least 0.01 to 10 wt. % of zeolites high in silicon that are at least partially bound ionically thereto or incorporated therein, and wherein the zeolite has a silicon dioxide/aluminum oxide ratio in its skeleton of greater than 20. 4. The absorbent, crosslinked polymer according to claim 3, wherein the polymer is constituted up to 30% of further monoethylenically unsaturated monomers other than the monomers bearing acid groups. 5. The absorbent, crosslinked polymer according to claim 3, wherein the polymer has 40 wt. % of a water-soluble, natural or synthetic polymer incorporated therein by polymerization and/or graft polymerization. 6. An absorbent, crosslinked polymer for water or aqueous body fluids, based on optionally partially neutralized, monoethylenically unsaturated monomers bearing acid groups, wherein the absorbent, crosslinked polymer has zeolites high in silicon at least partially bound ionically thereto or incorporated therein, and wherein the absorbent, crosslinked polymer has been coated with 0.01 to 30 wt.% relative to the polymer, of a crosslinker component which reacts with at least two carboxylic groups in the surface layer of the polymer particles, thereby effecting crosslining. 7. A process for producing an absorbent, crosslinked polymer for water or aqueous body fluids, wherein the absorbent, crosslinked polymer has zeolites high in silicon at least partially bound ionically thereto or incorporated therein, the process comprising free-radical polymerization of an aqueous solution of ethylenically unsaturated, optionally partially neutralized monomers bearing acid groups, optionally up to 30 wt. % of further monoethylenically unsaturated comonomers, crosslinking monomers, and optionally partially neutralized monomers bearing acid groups, optionally up to 30 wt. % of further monoethylenically unsaturated comonomers, crosslinking monomers, and optionally up to 40 wt. % of a water soluble natural or synthetic polymer according to the process of solution or suspension polymerization to form a hydrogel, optional isolation, crushing, followed by drying, milling/screening, and secondary surface crosslinking, wherein the zeolite high in silicon is added to the absorbent, crosslinked polymer during its surface crosslinking at the latest. 8. The process for producing the absorbent, crosslinked polymers according to claim 1, by free-radical polymerization of an aqueous solution of ethylenically unsaturated, optionally partially neutralized monomers bearing acid groups, optionally up to 30 wt. % of further monoethylenically unsaturated comonomers, crosslinking monomers, and optionally up to 40 wt. % of a water-soluble natural or synthetic polymer according to the process of solution of suspension polymerization to form a hydrogel, optional isolation, crushing, followed by drying, milling/screening, wherein the zeolite high in silicon is added to the absorbent, crosslinked polymer at a water content of greater than 10 wt. %. 9. The process according to claim 8, wherein the water content is greater than 30 wt. %. 10. An article having improved absorption to claim 8, wherein the water content is greater than 30 wt. %. 11. An absorbent for aqueous liquid, the absorbent including the absorbent crosslinked polymer according to claim 1, wherein the absorbent may be in the form of a construction for absorbing body fluids; in foamed sheet materials; in packaging materials; in plant breeding and as soil improver. 12. A hygiene article comprising the absorbent crosslinked polymer according to claim 1. 13. A stabilizer for active substances, particularly fertilizers or other active substances being released optionally in a delayed fashion, wherein the stabilizer comprises the absorbent crosslinked polymer according to claim 1. 14. The absorbent, crosslinked polymer according to claim 2, wherein the absorbent, crosslinked polymer comrprises at least 0.1 to 5 wt. % of zeolites high in silicon. 15. The absorbent, crosslinked polymer according to claim 14, wherein the absorbent, crosslinked polymer comprises at least 0.7 to 3 wt. % of zeolites high in silicon. 16. The absorbent, crosslinked polymer according to claim 3 wherein the zeolite has a silicon dioxide/aluminum oxide ratio in its skeleton of greater than 50. 17. The absorbent, crosslinked polymer according to claim 16 wherein the zeolite has a silicon dioxide/aluminum oxide ratio in its skeleton of greater than 100. 18. The absorbent, crosslinked polymer according to claim 17 wherein the zeolite has a silicon dioxide/aluminum oxide ratio in its skeleton of greater than 500. 19. The absorbent, crosslinked polymer according to claim 6, wherein the polymer has been coated with 0.1 to 10 wt. % relative to the polymer, of a crosslinker component which reacts with at least two carboxylic groups in the surface layer of the polymer particles, thereby effecting crosslinking. 20. The process according to claim 8, wherein the water content is greater than 50 wt. %. 21. The process according to claim 20, wherein the water content is greater than 65 wt. %.
Mertens Richard (Krefeld DEX) Dahmen Kurt (Mnchengladbach-Rheydt DEX) Brehm Helmut (Krefeld DEX), Cross-linked, water-absorbing polymer and its use in the production of hygiene items.
Stockhausen Dolf,DEX ; Hartan Hans-Georg,DEX ; Brehm Helmut,DEX ; Jonas Gerd,DEX ; Messner Bernfried ; Pflueger Klaus,DEX, Fluid-absorbing polymers, processes used in their production and their application.
Brandt Kerryn A. (Cincinnati OH) Goldman Stephen A. (Cincinnati OH) Inglin Thomas A. (Cincinnati OH), Hydrogel-forming polymer compositions for use in absorbent structures.
Brehm Helmut (Krefeld DEX) Mertens Richard (Krefeld DEX), Powdery absorbing material for aqueous liquids based on water-swellable carboxylate polymers.
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