[특허]Recycling superabsorbent polymer fines

[미국특허] Recycling superabsorbent polymer fines 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	C08F-020/10
출원번호	US-0673169 (2012-11-09)
등록번호	US-8487049 (2013-07-16)
발명자 / 주소	Tian, Gonglu Smith, Scott J. Pate-Linton, Janet
출원인 / 주소	Evonik Stockhausen, LLC
대리인 / 주소	Smith Moore Leatherwood LLP
인용정보	피인용 횟수 : 6 인용 특허 : 37

초록 ▼

A process is described for recycling superabsorbent polymer fines into a process that includes treating the superabsorbent polymer fines with caustic and a polymerization step for making the superabsorbent polymer gel. The process requires treating the superabsorbent polymer fines with a caustic, followed by mixture with polymerizable monomer solution, and polymerizing the mixture of the superabsorbent polymer fines and monomer to form the aqueous fluid absorbent polymer. In the process, the fines are incorporated into the new polymer gel and become indistinguishable there from. The gel may then be comminuted into a particulate dried and then separated into a portion having a desired minimum particle size in a fines portion having less than the desired size. The particulate may then be coated with a surface crosslinking agent and surface additives and heated for surface conversion.

대표청구항 ▼

1. A superabsorbent polymer composition comprising: (i) caustic treated superabsorbent polymer fines treated with from about 1 to about 12 wt % of a caustic solution comprising sodium hydroxide, sodium carbonate or sodium bicarbonate wherein the superabsorbent polymer fines have a particle size of less than about 150 μm. 2. The superabsorbent polymer composition of claim 1, further comprising (ii) a monomer solution comprising acrylic acid wherein from about 0.1 to about 30 wt % of the caustic treated superabsorbent polymer fines of (i) based on the weight of the monomer solution are added to the monomer solution. 3. The superabsorbent polymer composition of claim 2, further comprising (iii) from about 0.001 to about 5.0 wt % based on the monomer of an internal crosslinking agent. 4. The superabsorbent polymer composition of claim 2, wherein the acrylic acid of the monomer solution is neutralized to from about 50 mol % to about 80 mol %. 5. The superabsorbent polymer composition of claim 1, wherein the superabsorbent polymer composition comprises less than 10% moisture thus forming a dry superabsorbent polymer composition. 6. The superabsorbent polymer composition of claim 5, further comprising (iv) from about 0.001 to about 5.0 wt % based on the weight of the dry superabsorbent polymer composition of a surface crosslinking agent. 7. The superabsorbent polymer composition of claim 1, wherein the content of the superabsorbent polymer fines relative to the total amount of the superabsorbent polymer composition is from about 0.1 to about 10 wt %. 8. The superabsorbent polymer composition of claim 1, further comprising (v) a multivalent metal salt selected from aluminum sulfate or aluminum lactate. 9. The superabsorbent polymer composition of claim 5, further comprising (vi) from about 0.01 to about 0.5 wt % based on the weight of the dry superabsorbent polymer of a thermoplastic polymer coating wherein the thermoplastic polymer is selected from polyolefin, polyethylene, polyesters, polyurethanes, linear low density polyethylene, ethylene acrylic acid copolymer, styrene copolymers, ethylene alkyl methacrylate copolymer, polypropylene, maleated polypropylene, ethylene vinyl acetate copolymer, polyamide, polyester, or blends and copolymers thereof. 10. The superabsorbent polymer composition of claim 9, wherein the thermoplastic polymer is maleated polypropylene. 11. The superabsorbent polymer composition of claim 5, further comprising (vii) from about 0.01 to about 0.5 wt % based on the weight of the dry superabsorbent polymer of poly(vinyl amine). 12. The superabsorbent polymer composition of claim 5, further comprising (viii) from about 0.01 to about 3 wt % based on the weight of the dry superabsorbent polymer of a silica. 13. The superabsorbent polymer composition of claim 12, wherein the silica comprises precipitated silica.

이 특허에 인용된 특허 (37) 인용/피인용 타임라인 분석

Plischke Manfred (Steinbach/Ts DEX), Absorbent hydrogel fines in absorbent structures.
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Crampton John R. (East Grinstead GBX) Whiting Howard (Redhill GBX), Absorbent materials.
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John Collins Dyer ; Stephen Allen Goldman ; Herbert Louis Retzsch, Absorbent members for body fluids using hydrogel-forming absorbent polymer.
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Kajikawa Katsuhiro,JPX ; Hatsuda Takumi,JPX ; Nakamura Masatoshi,JPX, Absorbent resin composition and method for production thereof.
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Smith,Scott; Messner,Bernfried; Frank,Markus, Absorbing structure having improved blocking properties.
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Smith,Scott; Messner,Bernfried; Frank,Markus, Absorbing structure having improved blocking properties.
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Ahmed, Iqbal; Jones, Angela Marie; Smith, Scott J., Cellulose material with improved absorbency.
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Ahmed,Iqbal; Jones,Angela Marie; Smith,Scott J., Cellulose material with improved absorbency.
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Lang,Angela Jones; Soerens,Dave Allen; Ahmed,Iqbal; Smith,Scott J., Flexible superabsorbent binder polymer composition.
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Lang,Angela Jones; Soerens,Dave Allen; Ahmed,Iqbal; Smith,Scott J., Flexible superabsorbent binder polymer composition.
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Smith, Scott J.; McIntosh, Stan; Bergman, Jr., David L., High permeability superabsorbent polymer compositions.
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Crampton John R. (East Grinstead GBX) Whiting Howard (Redhill GBX), Method for making absorbent materials.
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Lang,Angela Jones; Soerens,Dave Allen; Ahmed,Iqbal; Smith,Scott J.; Lostocco,Michael Ralph; Bunyard,W. Clayton, Method for preparing a flexible superabsorbent binder polymer composition.
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Kajikawa Katsuhiro (Himeji JPX) Masuda Yoshihiko (Takarazuka JPX) Nagasuna Kinya (Himeji JPX) Irie Yoshio (Himeji JPX), Method for production of absorbent resin.
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Lewis William H. (Palos Heights IL) Bailey Kristy M. (Naperville IL), Method for reconstituting superabsorbent polymer fines.
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Henderson John A. (Birkenhead IL GBX) Tomlin Anthony S. (Island Lake IL) Lucas David M. (West Kirby GBX), Method of increasing the size and absorption under load of superabsorbent fine particles by impregnation with an aqueous.
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Loeker, Frank; Bremus, Heinz; Smith, Scott, Powdery water-absorbing polymers with fine particles bound by thermoplastic adhesives.
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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.
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Graham Andrew T. (Midland MI) Gartner Herbert (Baden Baden DEX), Process for recycling aqueous fluid absorbents fines to a polymerizer.
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Bailey Kristy M. (Naperville IL) Flasch Glenn W. (Naperville IL), Reconstitution of superabsorbent polymer fines using persulfate salts.
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Kang,Seungkoo; Smith,Scott J., Superabsorbent polymer.
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Ahmed,Iqbal; Jones,Angela M.; Tomlin,Scott; Smith,Scott J., Superabsorbent polymer aqueous paste and coating.
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Ahmed,Iqbal; Jones,Angela M.; Tomlin,Scott; Smith,Scott J., Superabsorbent polymer aqueous paste and coating.
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Ahmed, Iqbal; Walden, Mirko; King, Brian; Smith, Scott J.; Schmidt, Harald, Superabsorbent polymer compositions having color stability.
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Ahmed, Iqbal; Walden, Mirko; King, Brian; Smith, Scott J.; Schmidt, Harald, Superabsorbent polymer compositions having color stability.
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Ahmed, Iqbal; Walden, Mirko; King, Brian; Smith, Scott J.; Schmidt, Harald, Superabsorbent polymer compositions having color stability.
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Azad, Michael M.; Smith, Scott J.; Joy, Mark; Blake, Geoffrey Wyatt; Jarman, Michael S., Superabsorbent polymer containing clay, particulate, and method of making same.
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Tian, Gonglu; Bergman, Jr., David L.; Shi, Yaru, Superabsorbent polymer having a capacity increase.
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Ahmed, Iqbal; Jones, Angela Marie; Smith, Scott J., Superabsorbent polymer having delayed free water absorption.
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Smith Scott J. (Warrenville IL) Lind Eric J. (Naperville IL), Superabsorbent polymer having improved absorption rate and absorption under pressure.
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Smith Scott J. (Warrenville IL) Lind Eric J. (Naperville IL), Superabsorbent polymer having improved absorption rate and absorption under pressure.
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Smith, Scott J.; Joy, Mark C.; Hsu, Whei-Neen; Frank, Markus; Azad, Michael M., Superabsorbent polymer with high permeability.
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Smith, Scott J.; McIntosh, Stan; Bremus, Heinz; Loeker, Frank, Superabsorbent polymer with high permeability.
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Smith,Scott J.; Joy,Mark C.; Hsu,Whei Neen; Frank,Markus, Superabsorbent polymer with high permeability.
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Smith,Scott J.; McIntosh,Stan; Bremus,Heinz; Loeker,Frank, Superabsorbent polymer with high permeability.
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McIntosh, Stan; Smith, Scott J.; Lang, Angela Jones; Bergman, Jr., David L., Thermoplastic coated superabsorbent polymer compositions.
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Loeker, Frank; Bremus, Heinz; Smith, Scott, Water-absorbing polymer particles with thermoplastic coating.
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이 특허를 인용한 특허 (6) 인용/피인용 타임라인 분석

Smith, Scott J.; McIntosh, Stan; Bergman, Jr., David L., High permeability superabsorbent polymer compositions.
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Wattebled, Laurent; Pillat, Jessica; Maus, Lisa; Smith, Scott; Harren, Jorg, Odor and color stable water-absorbing composition.
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Shi, Yaru; Tian, Gonglu; Joy, Mark; Blake, Geoff; Smith, Scott; Messner, Bernfried, Particulate superabsorbent polymer composition having improved performance properties.
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Tian, Gonglu; Ondisco, Matthew Thomas; Bergman, David L.; Messner, Bernfried; Smith, Scott J.; Joy, Mark, Particulate superabsorbent polymer composition having improved stability.
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Smith, Scott J.; McIntosh, Stan; Bremus, Heinz; Loeker, Frank, Superabsorbent polymer with high permeability.
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Frank, Markus; Loeker, Frank; Magolei, Dirk; Smith, Scott J., Water-absorbing polymer.
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[미국특허] Recycling superabsorbent polymer fines 원문보기

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