This invention is to provide an absorbent member and a method for making such an absorbent member. The absorbent member comprises modified water absorbent having good production efficiency, good absorbency against pressure, good absorption speed, gel strength, good liquid permeability, and the like.
This invention is to provide an absorbent member and a method for making such an absorbent member. The absorbent member comprises modified water absorbent having good production efficiency, good absorbency against pressure, good absorption speed, gel strength, good liquid permeability, and the like. The modified water absorbent resin is made by a method, which comprises (i) a mixing step comprising mixing a water absorbent resin, water, and a water-soluble radical polymerization initiator without addition of an ethylenically unsaturated monomer, to obtain a water absorbent resin composition, and (ii) an irradiating step comprising irradiating said water absorbent resin composition obtained in the mixing step with active energy rays, wherein the surface water content of said water absorbent resin in said water absorbent resin composition at least at any point of time in the irradiating step (ii) is controlled to a level of not lower than 3.0% by weight based on 100% by weight of the water absorbent resin. Preferably, the amount of water mixed in said step (i) exceeds 20 parts by weight and is not more than 100 parts by weight based on 100 parts by weight of the water absorbent resin.
대표청구항▼
What is claimed is: 1. A method for making an absorbent member comprising modified water absorbent resin, said absorbent member being suitable for use in absorbent articles, said method comprising the steps of: a) providing an absorbent member; and b) providing modified water absorbent resin, said
What is claimed is: 1. A method for making an absorbent member comprising modified water absorbent resin, said absorbent member being suitable for use in absorbent articles, said method comprising the steps of: a) providing an absorbent member; and b) providing modified water absorbent resin, said modified water absorbent resin being made by a method comprising: (i) a mixing step comprising mixing water absorbent resin, water, and a heat-degradable radical polymerization initiator without addition of an ethylenically unsaturated monomer, to obtain a water absorbent resin composition, and (ii) an irradiating step comprising irradiating said water absorbent resin composition obtained in the mixing step with active energy rays, and wherein the amount of water mixed in said step (i) exceeds 20 parts by weight and is not more than 100 parts by weight based on 100 parts by weight of the water absorbent resin, and wherein the surface water content of said water absorbent resin in said water absorbent resin composition at least at any point of time in the irradiating step (ii) is controlled to a level of not lower than 3.0% according to the equation: (m)=(1)×((k)/100) wherein m is the surface water content in wt %, 1 is the weight ratio of the amount of water contained in a treating solution in wt % and k is the extraction ratio in wt %; c) furnishing said absorbent member said water absorbent resin, which has been made by the method of step b). 2. The method according to claim 1, wherein said water-soluble radical polymerization initiator is at least one member selected from the group consisting of persulfates, hydrogen peroxide and water-soluble azo compounds. 3. The method according to claim 1, wherein the surface water content at the time of beginning said irradiating step is controlled to a level of not lower than 3.0% by weight. 4. The method according to claim 1, wherein the amount of said radical polymerization initiator in the mixing step is in the range of 0.01 to 20 parts by weight, based on 100 parts by weight of the water absorbent resin. 5. The method according to claim 1, wherein in the mixing step, said radical polymerization initiator is mixed in the form of an aqueous solution. 6. The method according to claim 1, wherein a mixing aid is added to the water absorbent resin simultaneously with carrying out the mixing step (i) or prior to the mixing step (i). 7. The method according to claim 1, wherein said water absorbent resin contains an acid group and has a neutralization ratio in the range of from 50 to 75 mol %. 8. The method according to claim 1, wherein said active energy rays are ultraviolet rays. 9. The method according to claim 1, wherein said water absorbent resin is a powdery water absorbent resin obtained by polymerizing a monomer containing an acrylic acid as a main component. 10. The method according to claim 1, wherein said water absorbent resin contains particles, 90% to 100% by weight of said particles having a particle diameter in the range of from 150 to 850 μm. 11. The method according to claim 1, wherein the absorbency of physiological saline against pressure of 4.83 kPa of the water absorbent resin after the modification is in the range of from 8 to 40 g/g. 12. The method according to claim 1, wherein the saline flow conductivity of the water absorbent resin after the modification is not less than 10×10−7·cm3·s·g−1.
연구과제 타임라인
LOADING...
LOADING...
LOADING...
LOADING...
LOADING...
이 특허에 인용된 특허 (95)
Rehmer Gerd (Bobenheim-Roxheim DEX) Boettcher Andreas (Nussloch DEX) Portugall Michael (Wachenheim DEX), (Meth)acrylate copolymer based UV-crosslinkable materials.
Riegel,Ulrich; Daniel,Thomas; Weismantel,Matthias; Elliott,Mark; Funk,Rudiger; Schwalm,Reinhold, (Meth)acrylic ester of alkenylene glycols and the use thereof.
Buell Kenneth B. (Cincinnati OH) Clear Sandra H. (Maineville OH) Falcone Danielia T. (Cincinnati OH), Absorbent article with dynamic elastic waist feature having a predisposed resilient flexural hinge.
Robles Miguel Alvaro ; Dreier Kimberly Ann ; Bergman Carl Louis ; Roe Donald Carroll ; Dakin Constance Lee, Absorbent article with multi-directional extensible side panels.
Roe Donald C. (West Chester OH) Goulait David J. K. (Cincinnati OH) Rodriguez Sheila S. (Cincinnati OH) Carlin Edward P. (Maineville OH) Dreier Kimberly A. (Cincinnati OH) Jasper Carolyn M. (Cincinna, Absorbent article with multiple zone structural elastic-like film web extensible waist feature.
DesMarais Thomas A. (Norwood OH) Stone Keith J. (Fairfield OH) Thompson Hugh A. (Fairfield OH) Young Gerald A. (Cincinnati OH) LaVon Gary D. (Harrison OH) Dyer John C. (Cincinnati OH), Absorbent foam materials for aqueous body fluids and absorbent articles containing such materials.
DesMarais Thomas Allen (Cincinnati OH) Stone Keith Joseph (Fairfield OH) Dyer John Collins (Cincinnati OH) Hird Bryn (Cincinnati OH) Goldman Stephen Allen (Cincinnati OH) Seiden Paul (Cincinnati OH), Absorbent foam materials for aqueous fluids made from high internal phase emulsions having very high water-to-oil ratios.
Goldman Stephen A. (Cincinnati OH) Retzsch Herbert L. (Cincinnati OH) Mansfield Todd L. (Cincinnati OH), Absorbent members for body fluids having good wet integrity and relatively high concentrations of hydrogel-forming absor.
Rehmer Gerd (Bobenheim-Roxheim DEX) Boettcher Andreas (Nussloch DEX) Portugall Michael (Wachenheim DEX), Benzophenone derivatives and their preparation.
Pacifici James G. (Kingsport TN) Wang Richard H. S. (Kingsport TN) Newland Gordon C. (Kingsport TN), Benzophenone initiators for the photopolymerization of unsaturated compounds.
Alemany Miguel (Cincinnati OH) Berg Charles J. (Cincinnati OH), High density absorbent members having lower density and lower basis weight acquisition zones.
Young Gerald A. (Cincinnati OH) LaVon Gary D. (Harrison OH) Taylor Gregory W. (Springdale OH), High efficiency absorbent articles for incontinence management.
Brandt Kerryn A. (Cincinnati OH) Goldman Stephen A. (Cincinnati OH) Inglin Thomas A. (Cincinnati OH), Hydrogel-forming polymer compositions for use in absorbent structures.
Umeda Masanari (Kasugai JPX) Sakuraba Yukio (Kasugai JPX) Baba Hiroshi (Yokohama JPX), Irradiation or thermal treatment of water-impregnated cross-linked poly-acrylic acid metal salt resin particles.
Ward John B. (Bushey GB2) Noble Hazel M. (Burnham GB2) Porter Neil (Pinner GB2) Fletton Richard A. (Ruislip GB2) Noble David (Burnham GB2) Sutherland Derek R. (Chalfont St. Giles GB2) Ramsay Michael , Macrolide antibiotics.
Irie Yoshio (Himeji JPX) Hatsuda Takumi (Himeji JPX) Yonemura Koichi (Suita JPX), Method for production of particulate hydrated gel polymer and absorbent resin.
Weaver Mary Ollidene (Peoria IL) Bagley Edward B. (Morton IL) Fanta George F. (Peoria IL) Doane William M. (Morton IL), Method of reducing water content of emulsions, suspensions, and dispersions with highly absorbent starch-containing poly.
Riegel,Ulrich; Daniel,Thomas; Hermeling,Dieter; Elliott,Mark; Schwalm,Reinhold, Mixtures of compounds comprising at least two double bonds and use thereof.
Yoneda Yoshiyuki (Kawasaki JPX) Tsuji Kazuto (Kawasaki JPX), Semiconductor device in a resin package housed in a frame having high thermal conductivity.
LaVon Gary D. (Harrison OH) Young Gerald A. (Cincinnati OH) Taylor Gregory W. (West Chester OH) Roe Donald C. (West Chester OH) Andes William S. (Springfield OH), Slitted absorbent members for aqueous body fluids formed of expandable absorbent materials.
Chambers Douglas R. (Chesapeake VA) Chiang William G-J (Virginia Beach VA) Woodrum Guy T. (Chesapeake VA), Superabsorbent polymers and products therefrom.
Gartner Herbert (Baden-Baden DEX) Burgert Josef (Achern-Fautenbach DEX), Surface crosslinked and surfactant coated absorbent resin particles and method of preparation.
Dyer John C. (Cincinnati OH) DesMarais Thomas A. (Cincinnati OH) LaVon Gary D. (Harrison OH) Stone Keith J. (Fairfield OH) Taylor Gregory W. (West Chester OH) Young Gerald A. (Cincinnati OH), Thin-unit-wet absorbent foam materials for aqueous body fluids and process for making same.
Rehmer Gerd (Beindersheim DEX) Boettchher Andreas (Nussloch DEX) Auchter Gerhard (Duerkheim DEX), UV-crosslinkable materials based on (meth)acrylate polymers.
Westerman Ira John (Strongsville OH), Water absorbent polymers comprising unsaturated carboxylic acid, acrylic ester containing alkyl group 10-30 carbon atoms.
Hans-Joachim Hahnle DE; Ulrich Schroder DE; Martin Beck DE; Wolfgang Heider DE; Gunnar Schornick DE; Thomas Anstock DE, Water-absorbing, cross-linked polymerizates in the form of a foam, a method for the production thereof, and their use.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.