Water absorbent resin particles of crosslinked carboxyl-containing polymers with low monomer content
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
C08C-019/20
C08F-008/42
출원번호
US-0450432
(2001-12-18)
국제출원번호
PCT//US01/48879
(2003-10-10)
§371/§102 date
20031010
(20031010)
국제공개번호
WO02//05360
(2002-07-11)
발명자
/ 주소
Kim, Young-Sam
출원인 / 주소
Dow Global Technologies Inc.
인용정보
피인용 횟수 :
10인용 특허 :
15
초록
Superabsorbent polymers having reduced levels of residual monomer are produced using a peroxodisulfate salt.
대표청구항▼
1. A process for the preparation of water-absorbent resin particles, the process comprising:(I) polymerizing a polymerization mixture comprising: (a) one or more ethylenically unsaturated carboxyl-containing monomers, (b) one or more crosslinking agents, (c) optionally one or more comonomers copolym
1. A process for the preparation of water-absorbent resin particles, the process comprising:(I) polymerizing a polymerization mixture comprising: (a) one or more ethylenically unsaturated carboxyl-containing monomers, (b) one or more crosslinking agents, (c) optionally one or more comonomers copolymerizable with the carboxyl-containing monomer, and (d) a polymerization medium, to form a crosslinked hydrogel, (II) contacting the crosslinked hydrogel with a peroxodisulfate salt, (III) comminuting the hydrogel to particles prior to or after the peroxodisulfate salt is added in step (II), and (IV) drying the hydrogel to form resin, wherein step (II) is conducted in the substantial absence of a combination of surfactant and a material capable of adding across or reacting with a vinylic double bond so as to form reaction products which are incapable of vinylic polymerization via free radical initiation.2. The process of claim 1 wherein the amount of peroxodisulfate salt is from 0.001 to 15 parts by weight per hundred parts by weight of the total amount of components (a), (b) and (c) of the polymerization mixture.3. The process of claim 1 wherein the peroxodisulfate salt is in the form of an aqueous solution.4. The process of claim 1 wherein at least part of the salt is employed as fines that were pretreated with an aqueous peroxodisulfate salt solution.5. The process of claim 1 wherein the hydrogel is processed into particles having particle sizes of from 0.05 to 10 cm during the polymerization reaction in step (1).6. The process of claim 1 further comprising heating the dried hydrogel from step (IV) to a temperature of from 170 to 250° C. for from 1 to 60 minutes.7. The process of claim 6 wherein the heating is conducted in the presence of a chlorine-or bromine-containing oxidizing agent.8. The process of claim 7 wherein the chlorine- or bromine-containing oxidizing agent is dissolved or dispersed in the polymerization mixture in an amount of from 10 to 2,000 ppm, based on the total weight of monomers, prior to initiation of the polymerization in step (1).9. The process of claim 1 wherein the peroxodisulfate salt is contacted with the hydrogel in step (II) prior to comminuting the hydrogel in step (III).10. The process of claim 9 wherein the contacting of the peroxodisulfate salt with the hydrogel in step (II) is conducted in the substantial absence of at least one of the following additives: reducing agents, water-insoluble fine inorganic particles, surfactants, organic solvents, and mineral oil.11. The process of claim 1 wherein the peroxodisulfate salt is an alkali metal peroxodisulfate or ammonium peroxodisulfate.12. The process of claim 7 wherein the chlorine- or bromine-containing oxidizing agent is selected from the group consisting of sodium chlorate, potassium chlorate, sodium bromate, potassium bromate, sodium chlorite and potassium chlorite or mixtures thereof.13. The process of claim 1 wherein the peroxodisulfate salt is sodium persulfate.14. A process for the preparation of water-absorbent resin particles, the process comprising:(I) polymerizing a polymerization mixture comprising: (a) acrylic acid, (b) one or more crosslinking agents, (c) optionally one or more comonomers copolymerizable with acrylic acid, and (d) an aqueous polymerization medium, to form a crosslinked hydrogel, (II) contacting the crosslinked hydrogel with a peroxodisulfate salt, (III) comminuting the hydrogel to particles prior to adding the peroxodisulfate salt in step (II), and (IV) drying the hydrogel to form resin, wherein step (II) is conducted in the substantial absence of a combination of surfactant and a material capable of adding across or reacting with a vinylic double bond so as to form reaction products which are incapable of vinylic polymerization via free radical initiation.15. The process of claim 14 wherein the peroxodisulfate salt is sodium persulfate.16. The process of claim 14 wherein the amount of peroxodisulfate salt is from 0.001 to 15 parts by weight per hundred parts by weight of the total amount of components (a), (b) and (c) of the polymerization mixture.17. A process for the preparation of water-absorbent resin particles, the process comprising:(I) polymerizing a polymerization mixture comprising: (a) acrylic acid, (b) one or more crosslinking agents according to Formula I: R1(?(R2O)n?C(O)R3)k wherein: R1 is a straight- or branched-chain polyalkoxy radical with 1 to 10 carbon atoms, optionally substituted with one or more oxygen atoms in the backbone; R2 is independently in each occurrence an alkylene group of 2 to 4 carbon atoms; R3 is independently in each occurrence a straight- or branched-chain alkenyl moiety with 2 to 10 carbon atoms; n is a number from 1 to 20; and x is a number from 2 to 8(c) optionally one or more comonomers copolymerizable with the carboxyl-containing monomer, and (d) an aqueous polymerization medium, to form a crosslinked hydrogel, (II) contacting the crosslinked hydrogel with 0.001 to 15 parts by weight per hundred parts by weight of the total amount of an alkali metal or ammonium peroxodisulfate salt, (III) comminuting the hydrogel to particles prior to or after the peroxodisulfate salt is added in step (11), and (IV) drying the hydrogel to form resin, wherein step (II) is conducted in the substantial absence of a combination of surfactant and a material capable of adding across or reacting with a vinylic double bond so as to form reaction products which are incapable of vinylic polymerization via free radical initiation.
Obayashi Shigeji (Akashi JPX) Nakamura Morio (Kakogawa JPX) Fujiki Koichi (Kakogawa JPX) Yamamoto Takushi (Kobe JPX), Alkali metal acrylate or ammonium acrylate polymer excellent in salt solution-absorbency and process for producing same.
Brandt Kerryn A. (Cincinnati OH) Goldman Stephen A. (Cincinnati OH) Inglin Thomas A. (Cincinnati OH), Hydrogel-forming polymer compositions for use in absorbent structures.
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.
Gartner Herbert (Baden-Baden DEX) Petri Roswitha (Wissembourg FRX) Trijasson ; deceased Philippe (late of Strasbourg FRX by Fabienne Jeanne Trijasson Heir at Law and Guardian for Florian Trijasson ; , Method of preparation of crosslinked hydrophilic resins.
Burgert Josef H. (Achern DEX) Christensen Stephen B. (Midland MI) Gartner Herbert A. (Baden-Baden DEX) Buchholz Fredric L. (Midland MI) Johnson Thomas C. (Midland MI) Graham Andrew T. (Midland MI), Water absorbent resin particles of crosslinked carboxyl containing polymers and method of preparation.
Kimura, Kazuki; Fujino, Shin-ichi; Wada, Katsuyuki; Ishizaki, Kunihiko, Particulate water absorbing agent comprising crosslinked absorbent resin and having low residual monomer, water absorbing article and method for production of water absorbing agent.
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