Patents by Inventor Masazumi Sasabe
Masazumi Sasabe 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).
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Patent number: 9796820Abstract: The present invention is a method for producing a water absorbent resin which method is a method for producing surface cross-linked water absorbent resin particles, the method including the successive steps of: (a) adding a surface cross-linking agent and water to a particulate water absorbent resin in a mixer; and (b) reacting the resulting water absorbent resin mixture taken out from the mixer with the surface cross-linking agent in a reactor by heating or active energy ray irradiation, water vapor being used as part or all of the water added in the mixer. This makes it possible to provide a method for producing a water absorbent resin in which method a surface cross-linked water absorbent resin that has excellent properties can be obtained efficiently at low cost with high productivity.Type: GrantFiled: December 20, 2013Date of Patent: October 24, 2017Assignee: Nippon Shokubai Co., Ltd.Inventors: Kenji Kadonaga, Kenji Tada, Masazumi Sasabe, Seiji Kato
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Publication number: 20140107293Abstract: The present invention is a method for producing a water absorbent resin which method is a method for producing surface cross-linked water absorbent resin particles, the method including the successive steps of: (a) adding a surface cross-linking agent and water to a particulate water absorbent resin in a mixer; and (b) reacting the resulting water absorbent resin mixture taken out from the mixer with the surface cross-linking agent in a reactor by heating or active energy ray irradiation, water vapor being used as part or all of the water added in the mixer. This makes it possible to provide a method for producing a water absorbent resin in which method a surface cross-linked water absorbent resin that has excellent properties can be obtained efficiently at low cost with high productivity.Type: ApplicationFiled: December 20, 2013Publication date: April 17, 2014Applicant: Nippon Shokubai Co., Ltd.Inventors: Kenji KADONAGA, Kenji TADA, Masazumi SASABE, Seiji KATO
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Patent number: 8648150Abstract: The present invention is a method for producing a water absorbent resin which method is a method for producing surface cross-linked water absorbent resin particles, the method including the successive steps of: (a) adding a surface cross-linking agent and water to a particulate water absorbent resin in a mixer; and (b) reacting the resulting water absorbent resin mixture taken out from the mixer with the surface cross-linking agent in a reactor by heating or active energy ray irradiation, water vapor being used as part or all of the water added in the mixer. This makes it possible to provide a method for producing a water absorbent resin in which method a surface cross-linked water absorbent resin that has excellent properties can be obtained efficiently at low cost with high productivity.Type: GrantFiled: March 4, 2010Date of Patent: February 11, 2014Assignee: Nippon Shokubai Co., Ltd.Inventors: Kenji Kadonaga, Kenji Tada, Masazumi Sasabe, Seiji Kato
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Patent number: 8598254Abstract: Aqueous liquid and moisture vapor are added to water absorbent resin powder so that particles of the water absorbent resin powder are bound. Supplying the aqueous liquid and moisture vapor to the water absorbent resin powder reduces the amount of particles that remain unbound (ungranulated) and increases the concentration of the water absorbent resin bound particles to provide improved drying efficiency and to obtain particulate water absorbent resin having excellent properties even when the bound particles are highly concentrated. The present invention provides (i) a method for binding water absorbent resin and (ii) a method for producing particulate water absorbent resin including the step of binding particles of water absorbent resin powder.Type: GrantFiled: September 4, 2008Date of Patent: December 3, 2013Assignee: Nippon Shokubai Co., Ltd.Inventors: Kenji Tada, Kenji Kadonaga, Masazumi Sasabe
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Patent number: 8598405Abstract: An object of the present invention is to provide a waste solution solidifying agent which can solidify a waste solution, particularly, a waste solution containing blood or body fluid at a low cost, uniformly, and in a short time; in particular, to provide a waste solution solidifying agent which can solidify a waste solution uniformly and in a short time in a vertically oriented waste solution equipment. As a means of achieving this object, a waste solution solidifying agent of the present invention is a particulate treating agent used in a method of treating a waste solution which solidifies a waste solution into a gel by placing a treating agent in a waste solution, and is characterized in that said agent contains, as an essential component, a water-absorbent resin having a crosslinked structure obtained by polymerizing a water-soluble ethylenic unsaturated monomer and, when flowing-placed at once into a 0.Type: GrantFiled: May 11, 2005Date of Patent: December 3, 2013Assignee: Nippon Shokubai Co., Ltd.Inventors: Yoshihiko Masuda, Masazumi Sasabe, Seiji Kato, Atsushi Tachibana, Kenji Kadonaga, Shigeru Oka
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Patent number: 8513364Abstract: A production method of a water-absorbent resin includes the steps of: obtaining a hydrogel by supplying monomer liquid to a reaction device so that the monomer liquid is polymerized; and detaching the hydrogel from the reaction device, wherein the reaction device's surface in contact with the monomer liquid at a position where polymerization occurs is made of a fluororesin having a melt viscosity of less than 1×108 poise at 380° C. On this account, it is possible to obtain a water-absorbent resin having less amounts of an extractable content with high productivity and it is possible to carry out continuous production for an extended period of time.Type: GrantFiled: January 20, 2006Date of Patent: August 20, 2013Assignee: Nippon Shokubai Co., Ltd.Inventors: Masazumi Sasabe, Sumio Okuda, Yorimichi Dairoku, Shuji Kanzaki, Yoshihiro Kita, Motohiro Imura
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Patent number: 8501873Abstract: A homogeneously surface cross-linked water absorbent resin and a method for the production thereof are provided. The water absorbent material is formed of a surface cross-linked water absorbent resin resulting from granular irregularly pulverized shaped surface cross-linking the product of partial neutralization or whole neutralization of a water absorbent resin having acrylic acid or a metal salt thereof as a main component, which water absorbent material shows a metal atom concentration on the surface of the water absorbent material in the range of 0-10% within 0 second of polishing and 2-35% at 10 seconds value of polishing as determined by subjecting the water absorbent material to Ar ion discharge polishing under a voltage of 500 ?. The surface cross-linked water absorbent resin to be used herein can be produced by surface cross-linking a water absorbent resin having a specific particle diameter with a surface cross-linking agent having a water concentration in a specific range.Type: GrantFiled: August 31, 2005Date of Patent: August 6, 2013Assignee: Nippon Shokubai Co., Ltd.Inventors: Masazumi Sasabe, Kenji Kadonaga, Shigeru Sakamoto, Motohiro Imura, Tsunemasa Ueno, Hiroko Ueda, Yoshifumi Adachi
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Publication number: 20110319518Abstract: The present invention is a method for producing a water absorbent resin which method is a method for producing surface cross-linked water absorbent resin particles, the method including the successive steps of: (a) adding a surface cross-linking agent and water to a particulate water absorbent resin in a mixer; and (b) reacting the resulting water absorbent resin mixture taken out from the mixer with the surface cross-linking agent in a reactor by heating or active energy ray irradiation, water vapor being used as part or all of the water added in the mixer. This makes it possible to provide a method for producing a water absorbent resin in which method a surface cross-linked water absorbent resin that has excellent properties can be obtained efficiently at low cost with high productivity.Type: ApplicationFiled: March 4, 2010Publication date: December 29, 2011Applicant: NIPPON SHOKUBAI CO., LTD.Inventors: Kenji Kadonaga, Kenji Tada, Masazumi Sasabe, Seiji Kato
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Publication number: 20110237739Abstract: Aqueous liquid and moisture vapor are added to water absorbent resin powder so that particles of the water absorbent resin powder are bound. In forming bound particles by supplying aqueous liquid and moisture vapor to the water absorbent resin powder, the foregoing arrangement makes it possible to supply moisture to whole the powder so that a less amount of particles remains unbound (ungranulated) and increase of a concentration of the water absorbent resin bound particles allows for further improvement of a drying efficiency and makes it possible to obtain particulate water absorbent resin having excellent properties even when the bound particles are highly concentrated. The present invention provides (i) a method for binding water absorbent resin and (ii) a method for producing particulate water absorbent resin which method includes the step of binding particles of water absorbent resin powder. The foregoing effect can be obtained by these methods.Type: ApplicationFiled: September 4, 2008Publication date: September 29, 2011Applicant: NIPPON SHOKUBAI CO., LTD.Inventors: Kenji Tada, Kenji Kadonaga, Masazumi Sasabe
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Patent number: 7638078Abstract: An object of the present invention is to make it possible that: a high-concentration hydrogel sheet, which is suitable for production of high-performance water-absorbent resin particles, is cut efficiently without involving the adhesion to such as cutting-blades; and the subsequent disintegration operation is also successfully carried out; and hydrogel particles excellent in the quality and performances are efficiently produced.Type: GrantFiled: August 27, 2004Date of Patent: December 29, 2009Assignee: Nippon Shokubai Co., Ltd.Inventors: Masazumi Sasabe, Kozo Nogi, Shigeru Sakamoto, Yasuhiro Fujita, Akihiro Morita, Hiroaki Hattori
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Publication number: 20070264489Abstract: A homogeneously surface cross-linked water absorbent resin and a method for the production thereof are provided. The water absorbent material is formed of a surface cross-linked water absorbent resin resulting from granular irregularly pulverized shaped surface cross-linking the product of partial neutralization or whole neutralization of a water absorbent resin having acrylic acid or a metal salt thereof as a main component, which water absorbent material shows a metal atom concentration on the surface of the water absorbent material in the range of 0-10% within 0 second of polishing and 2-35% at 10 seconds value of polishing as determined by subjecting the water absorbent material to Ar ion discharge polishing under a voltage of 500 ?. The surface cross-linked water absorbent resin to be used herein can be produced by surface cross-linking a water absorbent resin having a specific particle diameter with a surface cross-linking agent having a water concentration in a specific range.Type: ApplicationFiled: August 31, 2005Publication date: November 15, 2007Applicant: NIPPON SHOKUBAI CO., LTD.Inventors: Masazumi Sasabe, Kenji Kadonaga, Shigeru Sakamoto, Motohiro Imura, Tsunemasa Ueno, Hiroko Ueda, Yoshifumi Adachi
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Patent number: 7288601Abstract: A method for mixing a water-absorbent resin and a surface cross-linking agent-containing solution to repress aggregates is equipped. The water-absorbent resin and the surface cross-linking agent-containing solution is mixed with a plow-shaped mixing device which is equipped with an inner wall formed of material manifesting an interfacial contact angle of not less than 60° to water and possessing a temperature of heat distortion of not lower than 70° C., a plow-shaped stirring vane and a disintegrating blade.Type: GrantFiled: May 27, 2004Date of Patent: October 30, 2007Assignee: Nippon Shokubai Co., Ltd.Inventors: Kozo Nogi, Masazumi Sasabe, Kenji Kadonaga, Yoshio Irie, Shigeru Sakamoto, Koji Miyake
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Publication number: 20070185366Abstract: An object of the present invention is to provide a waste solution solidifying agent which can solidify a waste solution, particularly, a waste solution containing blood or body fluid at a low cost, uniformly, and in a short time; in particular, to provide a waste solution solidifying agent which can solidify a waste solution uniformly and in a short time in a vertically oriented waste solution equipment. As a means of achieving this object, a waste solution solidifying agent of the present invention is a particulate treating agent used in a method of treating a waste solution which solidifies a waste solution into a gel by placing a treating agent in a waste solution, and is characterized in that said agent contains, as an essential component, a water-absorbent resin having a crosslinked structure obtained by polymerizing a water-soluble ethylenic unsaturated monomer and, when flowing-placed at once into a 0.Type: ApplicationFiled: May 11, 2005Publication date: August 9, 2007Inventors: Yoshihiko Masuda, Masazumi Sasabe, Seiji Kato, Atsushi Tachibana, Kenji Kadonaga, Shigeru Oka
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Publication number: 20070041796Abstract: The subject invention produces a water-absorbent resin by carrying out stationary polymerization of an ethylenically-unsaturated monomer containing acrylic acid and/or acrylate; cutting the resulting hydrous gelatinous polymer; and drying the hydrous gelatinous polymer which mainly contains angular particles having 6 smooth planes. The resulting water-absorbent resin particles are not aggregate, and can be efficiently dried. By coating at least a part of the surface of each of the particles with an adhesion block agent before, after, and/or at the time of cutting process, the adhesion preventing effect further increases.Type: ApplicationFiled: August 16, 2006Publication date: February 22, 2007Applicant: Nippon Shokubai Co., Ltd.Inventors: Yoshio Irie, Masazumi Sasabe, Seiji Kato, Yorimichi Dairoku
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Publication number: 20060167198Abstract: A production method of a water-absorbent resin includes the steps of: obtaining a hydrogel by supplying monomer liquid to a reaction device so that the monomer liquid is polymerized; and detaching the hydrogel from the reaction device, wherein the reaction device's surface in contact with the monomer liquid at a position where polymerization occurs is made of a fluororesin having a melt viscosity of less than 1×108 poise at 380° C. On this account, it is possible to obtain a water-absorbent resin having less amounts of an extractable content with high productivity and it is possible to carry out continuous production for an extended period of time.Type: ApplicationFiled: January 20, 2006Publication date: July 27, 2006Inventors: Masazumi Sasabe, Sumio Okuda, Yorimichi Dairoku, Shuji Kanzaki, Yoshihiro Kita, Motohiro Imura
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Patent number: 7001548Abstract: A method directed to manufacturing porous products by supplying a water-in-oil type high internal phase emulsion into mold elements, shaping and polymerizing the emulsion. It is characterized by a moving shaping unit provided with a lower mold element on one side having a smooth mold face furnished with a depressed part and an upper mold element on the other side having a smooth mold face furnished with a corresponding depressed part forming a cavity of a stereoscopic shape together with the depressed part of the lower mold element. Prior to the union of the two mold elements continuously supplying the emulsion into the two mold elements, transferring the shaping unit into a polymerizing device subsequent to the union of the mold elements, and shaping and polymerizing the emulsion therein.Type: GrantFiled: May 24, 2002Date of Patent: February 21, 2006Assignee: Nippon Shokubai Co., Ltd.Inventors: Katsuhiko Sakamoto, Masazumi Sasabe
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Publication number: 20050046069Abstract: An object of the present invention is to make it possible that: a high-concentration hydrogel sheet, which is suitable for production of high-performance water-absorbent resin particles, is cut efficiently without involving the adhesion to such as cutting-blades; and the subsequent disintegration operation is also successfully carried out; and hydrogel particles excellent in the quality and performances are efficiently produced.Type: ApplicationFiled: August 27, 2004Publication date: March 3, 2005Inventors: Masazumi Sasabe, Kozo Nogi, Shigeru Sakamoto, Yasuhiro Fujita, Akihiro Morita, Hiroaki Hattori
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Publication number: 20040240316Abstract: A method for mixing a water-absorbent resin and a surface cross-linking agent-containing solution to repress aggregates is equipped. The water-absorbent resin and the surface cross-linking agent-containing solution is mixed with a plow-shaped mixing device which is equipped with an inner wall formed of material manifesting an interfacial contact angle of not less than 60° to water and possessing a temperature of heat distortion of not lower than 70° C., a plow-shaped stirring vane and a disintegrating blade.Type: ApplicationFiled: May 27, 2004Publication date: December 2, 2004Inventors: Kozo Nogi, Masazumi Sasabe, Kenji Kadonaga, Yoshio Irie, Shigeru Sakamoto, Koji Miyake
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Patent number: 6765029Abstract: A method for dehydrating a porous cross-linked polymer conveniently to a low final water content is provided. A porous cross-linked polymer sheet is produced by a method which comprises causing a porous cross-linked polymer obtained by forming and polymerizing a water-in-oil type higher internal phase emulsion to be dehydrated by the use of non-woven fabric rolls furnished with an aspiration mechanism. Properly in this case, the porous cross-linked polymer is subjected to preliminary squeezing. In accordance with the present invention, a porous cross-linked polymer abounding in a water absorbing property to be dehydrated to a low final water content with a small number of rolls.Type: GrantFiled: June 13, 2002Date of Patent: July 20, 2004Assignees: Nippon Shokubai Co., Ltd., The Proctor & Gamble CompanyInventors: Masazumi Sasabe, Katsuhiko Sakamoto, Kozo Nogi, Motohiro Arakawa
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Patent number: 6750263Abstract: This invention provides a method of producing a porous cross-linked polymer by horizontal continuous polymerization of a water-in-oil higher internal phase emulsion (HIPE), which includes using a weir at the opposite end parts in the width direction of an emulsion supporting member for use in the polymerization. This invention also provides a method of producing a porous cross-linked polymer by horizontal continuous polymerization of an HIPE, which includes using a supporting member of the lower side of the emulsion and a sheet material on the upper side of the emulsion, and performing the polymerization by exerting a tensile force in the width direction and/or the travel direction of the sheet material.Type: GrantFiled: May 29, 2002Date of Patent: June 15, 2004Assignee: Nippon Shokubai Co., Ltd.Inventors: Masazumi Sasabe, Katsuhiko Sakamoto, Kozo Nogi