Method of producing polyacrylic acid (salt) water-absorbent resin
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
C08F-220/06
C08F-016/12
C08F-002/00
C08F-002/16
출원번호
US-0693355
(2007-03-29)
등록번호
US-8552134
(2013-10-08)
우선권정보
JP-2006-91566 (2006-03-29)
발명자
/ 주소
Fujimaru, Hirotama
Goto, Eri
Ishizaki, Kunihiko
Motoyama, Atsushi
출원인 / 주소
Nippon Shokubai Co., Ltd.
대리인 / 주소
Nixon & Vanderhye PC
인용정보
피인용 횟수 :
6인용 특허 :
14
초록▼
A method of producing a water-absorbent resin of the present invention reduces amounts of a residual cross-linking agent and a residual surfactant, achieves high productivity, and improves physical properties of the resultant water-absorbent, such as absorption capacity, extractable polymer content,
A method of producing a water-absorbent resin of the present invention reduces amounts of a residual cross-linking agent and a residual surfactant, achieves high productivity, and improves physical properties of the resultant water-absorbent, such as absorption capacity, extractable polymer content, powder friction, and gel crushability. The method includes the steps of: polymerizing an aqueous monomer solution containing as a major component an acrylic acid monomer in the presence of a cross-linking agent; and drying the resultant polymer by heating, in which the cross-linking agent is a multifunctional (meth)acrylate cross-linking agent having polyethylene glycol structural units including a total of 6 to 200 ethylene oxide repeating units, and the aqueous monomer solution includes a mono(meth)acrylate compound having polyethylene glycol structural units in an amount of 0.1 to 30% by weight relative to an amount of the multifunctional (meth)acrylate cross-linking agent.
대표청구항▼
1. A method of producing a polyacrylic acid (salt)-based water-absorbent resin, comprising the steps of: (a) neutralizing an acid moiety derived from an acrylic acid monomer,(b) polymerizing an aqueous monomer solution containing the acrylic acid monomer in an amount of 90 mol % or more relative to
1. A method of producing a polyacrylic acid (salt)-based water-absorbent resin, comprising the steps of: (a) neutralizing an acid moiety derived from an acrylic acid monomer,(b) polymerizing an aqueous monomer solution containing the acrylic acid monomer in an amount of 90 mol % or more relative to the total monomers excluding a cross-linking agent in the presence of a cross-linking agent, and(c) drying the resultant polymer by heating; wherein the aqueous monomer solution comprises the acrylic acid monomer, the cross-linking agent and a mono(meth)acrylate compound;wherein the cross-linking agent comprises a multifunctional (meth)acrylate-based cross-linking agent (i) having polyethylene glycol structural units including a total of 6 to 200 ethylene oxide repeating units and (ii) in an amount of 1.0×10−3 to 1.0 mol % relative to the amount of the acrylic acid monomer;wherein the mono(meth)acrylate compound has polyethylene glycol structural units;wherein the amount of the mono(meth)acrylate compound having polyethylene glycol structural units is 1.0×10−5 to 0.5 mol % relative to the amount of the acrylic acid monomer; andwherein ratio of the mono(meth)acrylate compound having polyethylene glycol units is 0.5 to 11.8 mol % relative to the amount of the multifunctional (meth)acrylate-based cross-linking agent having polyethylene glycol structural units including a total of 6 to 200 ethylene oxide repeating units; and the surface tension of water absorbent resin obtained is from 55 mN/m to 85 mN/m. 2. A method of producing a water-absorbent resin according to claim 1, wherein: a molecular weight distribution defined based on a distribution index of the ethylene oxide repeating units of the multifunctional (meth)acrylate-based cross-linking agent is 50 to 100%. 3. A method of producing a water-absorbent resin according to claim 1, wherein the aqueous monomer solution further comprises a (meth)acryloyloxy acrylate-based cross-linking agent having polyethylene glycol structural units in an amount of 0.01 to 30% by weight relative to an amount of the multifunctional (meth)acrylate-based cross-linking agent. 4. A method of producing a water-absorbent resin according to claim 1, wherein a ratio of a number of the polyethylene glycol structural units of a multifunctional (meth)acrylate-based cross-linking agent to a number of the polyethylene glycol structural units of the mono(meth)acrylate compound is in a range of 0.5 to 2.0. 5. A method of producing a water-absorbent resin according to claim 1, further comprising the step of surface cross-linking including heating after the step of drying the resultant polymer by heating. 6. A method of producing a water-absorbent resin according to claim 1, wherein the acrylic acid monomer solution further comprises a polymerization-inactive organic compound having a solubility parameter of 1.0×104 to 2.5×104 (Jm−3)1/2 in an amount of 1 to 1,000 ppm by weight. 7. A method of producing a water-absorbent resin according to claim 1, wherein the acrylic acid monomer solution further comprises iron in an amount of 0.01 to 5 ppm by weight. 8. A method of producing a water-absorbent resin according to claim 2, wherein the aqueous monomer solution further comprises a (meth)acryloyloxy acrylate-based cross-linking agent having polyethylene glycol structural units in an amount of 0.01 to 30% by weight relative to an amount of the multifunctional (meth)acrylate-based cross-linking agent. 9. A method of producing a water-absorbent resin according to claim 2, wherein a ratio of a number of the polyethylene glycol structural units of a multifunctional (meth)acrylate-based cross-linking agent to a number of the polyethylene glycol structural units of the mono(meth)acrylate compound is in a range of 0.5 to 2.0. 10. A method of producing a water-absorbent resin according to claim 3, wherein a ratio of a number of the polyethylene glycol structural units of a multifunctional (meth)acrylate-based cross-linking agent to a number of the polyethylene glycol structural units of the mono(meth)acrylate compound is in a range of 0.5 to 2.0. 11. A method of producing a water-absorbent resin according to claim 2, further comprising the step of surface cross-linking including heating after the step of drying the resultant polymer by heating. 12. A method of producing a water-absorbent resin according to claim 3, further comprising the step of surface cross-linking including heating after the step of drying the resultant polymer by heating. 13. A method of producing a water-absorbent resin according to claim 2, wherein the acrylic acid monomer solution further comprises a polymerization-inactive organic compound having a solubility parameter of 1.0×104 to 2.5×104 (Jm−3)1/2 in an amount of 1 to 1,000 ppm by weight. 14. A method of producing a water-absorbent resin according to claim 3, wherein the acrylic acid monomer solution further comprises a polymerization-inactive organic compound having a solubility parameter of 1.0×104 to 2.5×104 (Jm−3)1/2 in an amount of 1 to 1,000 ppm by weight. 15. A method of producing a water-absorbent resin according to claim 2, wherein the acrylic acid monomer solution further comprises iron in an amount of 0.01 to 5 ppm by weight. 16. A method of producing a water-absorbent resin according to claim 3, wherein the acrylic acid monomer solution further comprises iron in an amount of 0.01 to 5 ppm by weight. 17. A method of producing a water-absorbent resin according to claim 1, wherein: neutralization at least occurs before polymerization. 18. A method of producing a water-absorbent resin according to claim 1, wherein: neutralization at least occurs during polymerization. 19. A method of producing a water-absorbent resin according to claim 1, wherein: neutralization at least occurs after polymerization.
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이 특허에 인용된 특허 (14)
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