Patents by Inventor Yoshiro Mitsukami

Yoshiro Mitsukami has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20230372896
    Abstract: [Problem] Provided is a method for producing a water-absorbing resin powder excellent in water absorption speed. [Solution] The method for producing a water-absorbing resin powder according to the present invention includes a polymerization step of polymerizing an aqueous monomer solution to obtain a crosslinked hydrogel polymer, a gel-crushing step of crushing the crosslinked hydrogel polymer after the polymerization step using a gel-crushing device to obtain a crosslinked particulate hydrogel polymer, and a drying step of drying the crosslinked particulate hydrogel polymer to obtain a dried product, and in the method, the gel-crushing device includes an input port, a discharge port, and a main body incorporating a plurality of rotation axes each including a crusher, in the gel-crushing step, the crosslinked hydrogel polymer is continuously put into the gel-crushing device from the input port, the crosslinked hydrogel polymer is continuously crushed by the crusher at 50° C.
    Type: Application
    Filed: September 22, 2021
    Publication date: November 23, 2023
    Inventors: Tsuyoshi YORINO, Tomoyuki ARAKE, Hiroki HAYASHI, Ryota WAKABAYASHI, Masahumi INOUE, Naoki KATAKURA, Yoshifumi ADACHI, Yoshiro MITSUKAMI, Tatsuya YAMAGUCHI
  • Publication number: 20230285935
    Abstract: Provided are a water-absorbing agent composition of high quality (and stable quality) that can be produced without a decrease in productivity and is not colored even in a production process (or under production conditions) under high temperature conditions (under the condition of heating at 100° C. or higher), even when a polysaccharide is used as a sustainable raw material for at least part of the water-absorbing agent composition, and a method for producing the water-absorbing agent composition. The water-absorbing agent composition includes: a polyacrylic acid (salt)-based water-absorbing resin; a polysaccharide, and a reducing agent. The water-absorbing agent composition is surface-crosslinked, contains the polysaccharide in an amount of 10 mass% or more and contains the reducing agent in an amount of 10 ppm to 10000 ppm, and has a degree of coloration (YI value) of 60 or less.
    Type: Application
    Filed: July 13, 2021
    Publication date: September 14, 2023
    Inventors: Yoshiro MITSUKAMI, Tatsuya YAMAGUCHI, Takaaki WADA, Setsu INOUE
  • Publication number: 20220296438
    Abstract: Provided is a method for producing an absorbent article comprising a water-absorbing resin having an excellent initial water absorption speed under load even substantially without adding a liquid permeability enhancer. The method steps for producing the water-absorbing resin includes the step of polymerizing a monomer while adding certain polyalkylene glycol thereto so as to generate, during or after the polymerization, a crosslinked hydrogel polymer containing the polyalkylene glycol of a specific molecular weight, wherein the crosslinked hydrogel polymer has a centrifuge retention capacity within a given range and a final water-absorbing resin to be obtained has various physical properties (CRC, AAP, SFC, FSR) being within given ranges.
    Type: Application
    Filed: March 18, 2022
    Publication date: September 22, 2022
    Inventors: Carolin Michaela Borgmann, Heike Opper, Arsen Arsenov Simonyan, Yoshiro Mitsukami, Keisuke Kikuchi
  • Patent number: 10619011
    Abstract: A water-absorbing resin having a high swollen gel elastic modulus, a high swelling capacity and a method for producing the same are provided where the water-absorbing resin includes a water soluble unsaturated monomer having a dissociable group, an internal crosslinked structure index expressed by the following numerical formula of 14 or more, a weight average molecular weight (Mw) after a hydrolysis treatment of 220,000 or less, and a molecular weight distribution (Mw/Mn) after a hydrolysis treatment of 3.40 or less: Crosslinked structure index=(Equilibrium swelling capacity with respect to 0.9 wt % physiological saline solution1/3/(Weight average molecular weight (Mw) after hydrolysis treatment)×1000000; where the hydrolysis treatment leaves 50 mg of the water-absorbing resin as a solids content to stand still in 10 g of a 0.1 mol/l aqueous sodium hydroxide solution for 3 weeks at 80° C., and the weight average molecular weight (Mw) is measured after the treatment.
    Type: Grant
    Filed: June 23, 2015
    Date of Patent: April 14, 2020
    Assignee: NIPPON SHOKUBAI CO., LTD.
    Inventors: Kazuyuki Oshima, Yoshiro Mitsukami, Taku Fujimoto, Erina Minami
  • Patent number: 10172971
    Abstract: Absorbing articles comprises water absorbing resin including a water-soluble unsaturated monomer, having a dissociable group, as a main component in a repeating unit of a main chain and an internal cross-linked structure, in which a cross-linked structure index represented by the formula [Cross-linked structure index=(Equilibrium swelling capacity with respect to 0.9% by weight of brine)1/3/(Weight average molecular weight after hydrolysis treatment)×1,000,000] is 14 or more, a weight average molecular weight after hydrolysis treatment is 220,000 or less, and a molecular weight distribution after hydrolysis treatment is 3.40 or less, and a method for producing the same.
    Type: Grant
    Filed: February 19, 2015
    Date of Patent: January 8, 2019
    Assignee: The Procter & Gamble Company
    Inventors: Kazuyuki Oshima, Yoshiro Mitsukami, Taku Fujimoto, Erina Minami, Peter Dziezok, Marion Lutsche, Gabriela Schaefer
  • Patent number: 10046304
    Abstract: The present invention provides (i) a water absorbing agent which is excellent in a water absorbing physical properties, in particular water absorbing speed and has a great bulk specific gravity and (ii) a method for producing the water absorbing agent. The method for producing the water absorbing agent includes a surfactant adding step of adding a surfactant whose HLB is 10 or less. The surfactant adding step is the step of adding a dispersion liquid, which contains the surfactant equivalent to 30 parts by weight to 150 parts by weight, relative to 1000000 parts by weight of a water absorbent resin solid content, and the surfactant adding step is carried out after a drying step. Further, in a case where a water-soluble polyvalent metal salt adding step is carried out after the drying step, the surfactant adding step is carried out after the water-soluble polyvalent metal salt adding step.
    Type: Grant
    Filed: October 3, 2013
    Date of Patent: August 14, 2018
    Assignee: NIPPON SHOKUBAI CO., LTD.
    Inventors: Reiko Nakatsuru, Nobuya Tanaka, Yoshiro Mitsukami
  • Patent number: 9775927
    Abstract: A particulate water absorbing agent of the present invention is a water absorbing agent containing a water absorbing resin as a main component, the particulate water absorbing agent containing a polyvalent metal cation and satisfying: (1) the polyvalent metal cation is contained in an amount between 0.001 wt % and 5 wt % relative to the amount of the water absorbing agent; (2) an absorbency without pressure (CRC) is not less than 28 (g/g) and an absorbency against pressure (AAP 4.83 kPa) is not less than 10 (g/g); (3) the absorbency against pressure and the absorbency without pressure satisfy 77 ?AAP (4.83 kPa)+1.8×CRC?100; and (4) a moisture content of the water absorbing agent is between 5 wt % and 20 wt %. This provides a water absorbing agent which has blocking resistance after moisture absorption, is excellent in stability to shock and suppresses Re-Wet when used in a diaper.
    Type: Grant
    Filed: December 8, 2014
    Date of Patent: October 3, 2017
    Assignee: NIPPON SHOKUBAI CO., LTD.
    Inventors: Taishi Kobayashi, Motohiro Imura, Taku Iwamura, Katsuyuki Wada, Kozo Nogi, Yoshiro Mitsukami, Masato Abe, Hiroko Ueda, Koji Honda
  • Publication number: 20170158826
    Abstract: Provided is a water-absorbing resin capable of having a high swollen gel elastic modulus while maintaining a high swelling capacity and a method for producing the same. The problem described above is solved by a water-absorbing resin including a water soluble unsaturated monomer having a dissociable group as a main component of a repeating unit of a main chain, wherein the water-absorbing resin has an internal crosslinked structure, a crosslinked structure index expressed by the following numerical formula 1 is 14 or more, a weight average molecular weight (Mw) of the water-absorbing resin after a hydrolysis treatment is 220,000 or less, and a molecular weight distribution (Mw/Mn) of the water-absorbing resin after a hydrolysis treatment is 3.40 or less: Crosslinked structure index=(Equilibrium swelling capacity with respect to 0.
    Type: Application
    Filed: June 23, 2015
    Publication date: June 8, 2017
    Inventors: Kazuyuki OSHIMA, Yoshiro MITSUKAMI, Taku FUJIMOTO, Erina MINAMI
  • Publication number: 20150367018
    Abstract: Absorbing articles comprises water absorbing resin including a water-soluble unsaturated monomer, having a dissociable group, as a main component in a repeating unit of a main chain and an internal cross-linked structure, in which a cross-linked structure index represented by the formula [Cross-linked structure index=(Equilibrium swelling capacity with respect to 0.9% by weight of brine)1/3/(Weight average molecular weight after hydrolysis treatment)×1,000,000] is 14 or more, a weight average molecular weight after hydrolysis treatment is 220,000 or less, and a molecular weight distribution after hydrolysis treatment is 3.40 or less, and a method for producing the same.
    Type: Application
    Filed: February 19, 2015
    Publication date: December 24, 2015
    Inventors: Kazuyuki OSHIMA, Yoshiro Mitsukami, Taku Fujimoto, Erina Minami, Peter Dziezok, Marion Lutsche, Gabriela Schaefer
  • Publication number: 20150273433
    Abstract: The present invention provides (i) a water absorbing agent which is excellent in a water absorbing physical properties, in particular water absorbing speed and has a great bulk specific gravity and (ii) a method for producing the water absorbing agent. The method for producing the water absorbing agent includes a surfactant adding step of adding a surfactant whose HLB is 10 or less. The surfactant adding step is the step of adding a dispersion liquid, which contains the surfactant equivalent to 30 parts by weight to 150 parts by weight, relative to 1000000 parts by weight of a water absorbent resin solid content, and the surfactant adding step is carried out after a drying step. Further, in a case where a water-soluble polyvalent metal salt adding step is carried out after the drying step, the surfactant adding step is carried out after the water-soluble polyvalent metal salt adding step.
    Type: Application
    Filed: October 3, 2013
    Publication date: October 1, 2015
    Applicant: NIPPON SHOKUBAI CO., LTD.
    Inventors: Reiko Nakatsuru, Nobuya Tanaka, Yoshiro Mitsukami
  • Publication number: 20150129799
    Abstract: A particulate water absorbing agent of the present invention is a water absorbing agent containing a water absorbing resin as a main component, the particulate water absorbing agent containing a polyvalent metal cation and satisfying: (1) the polyvalent metal cation is contained in an amount between 0.001 wt % and 5 wt % relative to the amount of the water absorbing agent; (2) an absorbency without pressure (CRC) is not less than 28 (g/g) and an absorbency against pressure (AAP 4.83 kPa) is not less than 10 (g/g); (3) the absorbency against pressure and the absorbency without pressure satisfy 77?AAP (4.83 kPa)+1.8×CRC?100; and (4) a moisture content of the water absorbing agent is between 5 wt % and 20 wt %. This provides a water absorbing agent which has blocking resistance after moisture absorption, is excellent in stability to shock and suppresses Re-Wet when used in a diaper.
    Type: Application
    Filed: December 8, 2014
    Publication date: May 14, 2015
    Inventors: Taishi KOBAYASHI, Motohiro IMURA, Taku IWAMURA, Katsuyuki WADA, Kozo NOGI, Yoshiro MITSUKAMI, Masato ABE, Hiroki UEDA, Koji HONDA
  • Patent number: 8975339
    Abstract: Provided is a surface treatment method for a water-absorbent resin having excellent production efficiency, absorption capacity against pressure, fluid permeability or the like. Provided is a method for the surface treatment of a water-absorbent resin which comprises a) a step for mixing 0.1 to 20 parts by weight of an acid group-containing radically polymerizable compound and 5 to 20 parts by weight of water, relative to 100 parts by weight of a water-absorbent resin; and b) a step for polymerizing the acid group-containing radically polymerizable compound, wherein neutralization ratio of the acid group-containing radically polymerizable compound is 0 to 60% by mol, and is lower than neutralization ratio of the water-absorbent resin.
    Type: Grant
    Filed: October 8, 2008
    Date of Patent: March 10, 2015
    Assignee: Nippon Shokubai Co., Ltd.
    Inventors: Yoshiro Mitsukami, Taku Iwamura, Makoto Matsumoto
  • Patent number: 8952116
    Abstract: A particulate water absorbing agent of the present invention is a water absorbing agent containing a water absorbing resin as a main component, the particulate water absorbing agent containing a polyvalent metal cation and satisfying: (1) the polyvalent metal cation is contained in an amount between 0.001 wt % and 5 wt % relative to the amount of the water absorbing agent; (2) an absorbency without pressure (CRC) is not less than 28 (g/g) and an absorbency against pressure (AAP 4.83 kPa) is not less than 10 (g/g); (3) the absorbency against pressure and the absorbency without pressure satisfy 77?AAP (4.83 kPa)+1.8×CRC?100; and (4) a moisture content of the water absorbing agent is between 5 wt % and 20 wt %. This provides a water absorbing agent which has blocking resistance after moisture absorption, is excellent in stability to shock and suppresses Re-Wet when used in a diaper.
    Type: Grant
    Filed: September 29, 2010
    Date of Patent: February 10, 2015
    Assignee: Nippon Shokubai Co., Ltd.
    Inventors: Taishi Kobayashi, Motohiro Imura, Taku Iwamura, Katsuyuki Wada, Kozo Nogi, Yoshiro Mitsukami, Masato Abe, Hiroko Ueda, Koji Honda
  • Patent number: 8497226
    Abstract: An object of the present invention is to provide a water absorbent having excellent gel properties and showing excellent properties when used in a water-absorbing material of a sanitary/hygienic material such as paper diaper. Moreover, another object of the present invention is to provide a water absorbent which is safe and excellent in liquid permeability, and in which an amount of liquid permeability improver for improving the liquid permeability is reduced. The water absorbent is made from a water-absorbing resin prepared by a specific polymerization method and having a high degree of cross-linking, a high liquid holding property and a high gel strength (its swelling pressure of gel layer of is 35 kdyne/cm2 or more). This water absorbent is further processed to have a particular particle size distribution (95 wt % or more of its particles are less than 850ƒÊm but not less than 106ƒÊm, and logarithmic standard deviation (ƒĐƒÄ) is in a range of 0.25 to 0.
    Type: Grant
    Filed: August 13, 2010
    Date of Patent: July 30, 2013
    Assignee: Nippon Shokubai Co., Ltd.
    Inventors: Kazushi Torii, Hirofumi Shibata, Taku Iwamura, Yoshio Irie, Yorimichi Dairoku, Yoshiro Mitsukami, Sayaka Machida
  • Patent number: 8436090
    Abstract: A method for the production of a water-absorbing resin is to be provided which permits enhancement and stabilization of property, for example, liquid permeability, of a water-absorbing resin by a simple and convenient method without requiring change of raw materials or expensive facility investment. The method comprises a polymerization step for polymerizing an aqueous solution of acrylic acid (or salt thereof) to obtain a hydrogel cross-linked polymer; a drying step for drying the hydrogel cross-linked polymer to obtain a water-absorbing resin powder; a classification step for classifying the water-absorbing resin powder; and a surface cross-linking step for surface cross-linking the water-absorbing resin powder before or after the classification step, wherein electricity is eliminated in the classification step.
    Type: Grant
    Filed: September 11, 2009
    Date of Patent: May 7, 2013
    Assignee: Nippon Shokubai Co., Ltd.
    Inventors: Yorimichi Dairoku, Kozo Nogi, Syuji Kanzaki, Kunihiko Ishizaki, Koji Matsumoto, Yoshiro Mitsukami
  • Patent number: 8424786
    Abstract: [PROBLEM] To obtain a particulate water absorbent having excellent and stabilized physical properties.
    Type: Grant
    Filed: March 13, 2009
    Date of Patent: April 23, 2013
    Assignee: Nippon Shokubai Co., Ltd.
    Inventors: Kunihiko Ishizaki, Koji Matsumoto, Yoshiro Mitsukami
  • Patent number: 8247491
    Abstract: There are disclosed a water-absorbent resin composition and its production process, wherein the water-absorbent resin composition causes little gel-blocking and is excellent in the liquid permeability and liquid diffusibility and is high also in the absorption performances and further is strong also against the physical damage; and there are further disclosed a water-absorbent resin composition and its production process, wherein the water-absorbent resin composition has the following further advantages, in addition to the above, of involving little segregation of the metal compound and further having a dust prevention effect.
    Type: Grant
    Filed: February 6, 2004
    Date of Patent: August 21, 2012
    Assignee: Nippon Shokubai Co., Ltd.
    Inventors: Kazushi Torii, Yoshiro Mitsukami, Motohiro Imura, Taku Iwamura, Toshimasa Kitayama, Kenji Kadonaga, Hiroki Inoue, Koji Miyake, Kozo Nogi, Masatoshi Nakamura, Shigeru Sakamoto, Sayaka Machida
  • Publication number: 20120184670
    Abstract: A particulate water absorbing agent of the present invention is a water absorbing agent containing a water absorbing resin as a main component, the particulate water absorbing agent containing a polyvalent metal cation and satisfying: (1) the polyvalent metal cation is contained in an amount between 0.001 wt % and 5 wt % relative to the amount of the water absorbing agent; (2) an absorbency without pressure (CRC) is not less than 28 (g/g) and an absorbency against pressure (AAP 4.83 kPa) is not less than 10 (g/g); (3) the absorbency against pressure and the absorbency without pressure satisfy 77?AAP (4.83 kPa)+1.8×CRC?100; and (4) a moisture content of the water absorbing agent is between 5 wt % and 20 wt %. This provides a water absorbing agent which has blocking resistance after moisture absorption, is excellent in stability to shock and suppresses Re-Wet when used in a diaper.
    Type: Application
    Filed: September 29, 2010
    Publication date: July 19, 2012
    Applicant: Nippon Shokubai Co., Ltd.
    Inventors: Taishi Kobayashi, Motohiro Imura, Taku Iwamura, Katsuyuki Wada, Kozo Nogi, Yoshiro Mitsukami, Masato Abe, Hiroko Ueda, Koji Honda
  • Publication number: 20110166300
    Abstract: A method for the production of a water-absorbing resin is to be provided which permits enhancement and stabilization of property, for example, liquid permeability, of a water-absorbing resin by a simple and convenient method without requiring change of raw materials or expensive facility investment. The method comprises a polymerization step for polymerizing an aqueous solution of acrylic acid (or salt thereof) to obtain a hydrogel cross-linked polymer; a drying step for drying the hydrogel cross-linked polymer to obtain a water-absorbing resin powder; a classification step for classifying the water-absorbing resin powder; and a surface cross-linking step for surface cross-linking the water-absorbing resin powder before or after the classification step, wherein electricity is eliminated in the classification step.
    Type: Application
    Filed: September 11, 2009
    Publication date: July 7, 2011
    Applicant: Nippon Shokubai Co. Ltd
    Inventors: Yorimichi Dairoku, Kozo Nogi, Syuji Kanzaki, Kunihiko Ishizaki, Koji Matsumoto, Yoshiro Mitsukami
  • Patent number: 7879923
    Abstract: This invention is to provide a method for surface-treatment of a water absorbent resin excelling in water absorption properties. This invention relates to a method for the surface-treatment of a water absorbent resin, which comprises: a) mixing 100 parts by weight of a water absorbent resin, 0.01-20 parts by weight of at least one radical polymerization initiator selected from the group consisting of persulfates, hydrogen peroxide, and azo compounds, and a radically polymerizing compound and b) irradiating the resultant mixture with active energy rays. The treatment particularly exalts the absorption ratio against pressure and the saline flow conductivity.
    Type: Grant
    Filed: December 9, 2005
    Date of Patent: February 1, 2011
    Assignee: Nippon Shokubai Co., Ltd.
    Inventors: Makoto Matsumoto, Yoshiro Mitsukami, Hiroyuki Ikeuchi, Kazushi Torii, Taku Iwamura