Patents by Inventor Masayoshi Handa
Masayoshi Handa 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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Publication number: 20240134130Abstract: A ferrule is formed with an optical fiber insertion hole into which an optical fiber is inserted, and includes a resin composition containing a thermoplastic resin and a filler, wherein a size of coarse particles originated from the filler is 50 ?m or less, or a size of aggregates originated from the filler is 50 ?m or less.Type: ApplicationFiled: December 13, 2023Publication date: April 25, 2024Applicant: FURUKAWA ELECTRIC CO., LTD.Inventors: Masayoshi TSUKAMOTO, Takahiro MIURA, Masahiro HANDA
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Patent number: 9605094Abstract: There is disclosed a method for producing water-absorbent resin particles, comprising a polymerization step that includes mixing an oily liquid comprising a hydrocarbon dispersing medium and a surfactant, and an aqueous liquid comprising an aqueous solvent and a water-soluble ethylenically unsaturated monomer, forming a suspension comprising an oily liquid and an aqueous liquid dispersed in the oily liquid, and polymerizing the water-soluble ethylenically unsaturated monomer in the suspension. The HLB of the surfactant is 6 or greater, and the temperature of the suspension is kept at 35° C. or higher during the period from initial mixing of the oily liquid and aqueous liquid until complete mixing of the entire amounts.Type: GrantFiled: September 24, 2012Date of Patent: March 28, 2017Assignee: Sumitomo Seika Chemicals Co., Ltd.Inventors: Atsushi Heguri, Kenji Tanimura, Yuichi Onoda, Masayoshi Handa
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Patent number: 9320660Abstract: The present invention provides a method for producing water-absorbing resin particles having high equilibrium swelling capacity, a high water-absorption rate or high initial swelling capacity, and an appropriate particle size that achieves good handling performance; water-absorbing resin particles obtained by the method; and a water blocking material and an absorbent article which include the water-absorbing resin particles. The present invention is a method for producing water-absorbing resin particles, which comprises: preparing a hydrogel polymer by reversed-phase suspension polymerization of a water-soluble ethylenically unsaturated monomer in a hydrocarbon solvent in the absence of an internal crosslinking agent but in the presence of a surfactant with an HLB of 8 to 12; carrying out a post-crosslinking reaction of the hydrogel polymer whose moisture content is adjusted to 30 to 110 mass % based on a water-soluble ethylenically unsaturated monomer component that composes the hydrogel polymer.Type: GrantFiled: November 24, 2010Date of Patent: April 26, 2016Assignee: Sumitomo Seika Chemicals Co., Ltd.Inventors: Sachi Kikuno, Atsushi Heguri, Masayoshi Handa, Nobuhiro Maeda
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Patent number: 9273156Abstract: The present invention may provide a process for producing a water-absorbent resin by employing a reversed suspension polymerization method, by which a water-absorbent resin having a small particle size and a narrow particle size distribution can be produced. The process for producing a water-absorbent resin may include subjecting a water-soluble ethylenically unsaturated monomer to a reversed phase suspension polymerization in a petroleum hydrocarbon dispersion medium containing a surfactant and a polymeric dispersion agent, wherein the polymeric dispersion agent is a polymeric protective colloid having a weight average molecular weight (Mw) of 2,000 to 15,000 and a molecular weight distribution (Mw/number average molecular weight (Mn)) of 3 to 50.Type: GrantFiled: October 14, 2011Date of Patent: March 1, 2016Assignee: SUMITOMO SEIKA CHEMICALS CO., LTD.Inventors: Junichi Takatori, Masayoshi Handa, Kimihiko Kondo
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Patent number: 9233519Abstract: A water-absorbent sheet structure comprises a structure in which an absorbent layer containing a water-absorbent resin (A) and a water-absorbent resin (B) is sandwiched with fibrous webs from an upper side and a lower side of the absorbent layer, characterized in that the water-absorbent resin (A) and the water-absorbent resin (B) are contained in a total amount of from 100 to 1,000 g/m2, and that the water-absorbent resin (A) and the water-absorbent resin (B) have the following properties: (1) the water-absorbent resin (A) having a water-retention capacity of saline solution (Ra) from 15 to 55 g/g; (2) the water-absorbent resin (B) having a water-retention capacity of saline solution (Rb) from 10 to 50 g/g; and (3) Ra and Rb mentioned above satisfies the relationship of the following formula: Ra?Rb?(g/g).Type: GrantFiled: December 27, 2010Date of Patent: January 12, 2016Assignee: SUMITOMO SEIKA CHEMICALS CO., LTD.Inventors: Kiyoshi Yamaguchi, Syuji Tsuno, Haruka Inaba, Masayoshi Handa
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Patent number: 9199218Abstract: Disclosed is a water-absorbent resin particle in which the water-absorption rate of physiological saline is 1 second to 15 seconds, the median particle size is 100 ?m to 600 ?m, and the residual volatile component content is 1.5% by weight or less.Type: GrantFiled: July 23, 2012Date of Patent: December 1, 2015Assignee: Sumitomo Seika Chemicals Co., Ltd.Inventors: Masayoshi Handa, Kenji Tanimura, Atsushi Heguri, Yuichi Onoda
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Patent number: 9138722Abstract: There is disclosed a method for producing water-absorbent resin particles comprising a step that includes reversed-phase suspension polymerization of a water-soluble ethylenically unsaturated monomer in a suspension containing a surfactant that comprises a surfactant that comprises a fatty acid ester of sorbitan or sorbitol, or derivative thereof, and a hydrocarbon dispersion medium. The fatty acid ester includes a lauric acid ester and at least one kind of other ester selected from the group consisting of palmitic acid esters, stearic acid esters and behenic acid esters. The proportion of the peak area for lauric acid ester is 30-60%, based on the total peak area for fatty acid esters in the GPC chromatogram obtained from the fatty acid esters, and the proportion of the total peak area for other ester is 10-50%.Type: GrantFiled: January 22, 2013Date of Patent: September 22, 2015Assignee: Sumitomo Seika Chemicals Co., Ltd.Inventors: Kenji Tanimura, Hiroki Yabuguchi, Yuichi Onoda, Masayoshi Handa
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Patent number: 9061269Abstract: A method for producing a water-absorbent resin by a reversed-phase suspension polymerization method, includes step 1 of dispersing a first aqueous solution containing a partially neutralized product (A) of a water-soluble ethylenically unsaturated monomer having acid groups in the molecule in a petroleum-type hydrocarbon dispersion medium in the presence of a dispersing agent, and then polymerizing the resulting dispersion to obtain a slurry containing primary particles of a polymer, and step 2 of adding a second aqueous solution containing a partially neutralized product (B) of a water-soluble ethylenically unsaturated monomer having acid groups in the molecule to the slurry obtained in step 1, and then polymerizing the mixture to obtain a slurry in which the primary particles are agglomerated. In the method, a molar neutralization degree X of the partially neutralized product (A) and a molar neutralization degree Y of the partially neutralized product (B) are defined.Type: GrantFiled: January 23, 2012Date of Patent: June 23, 2015Assignee: SUMITOMO SEIKA CHEMICALS CO., LTD.Inventors: Masayoshi Handa, Koji Ueda, Kimihiko Kondo
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Publication number: 20150158015Abstract: There is disclosed a method for producing water-absorbent resin particles comprising a step that includes reversed-phase suspension polymerization of a water-soluble ethylenically unsaturated monomer in a suspension containing a surfactant that comprises a surfactant that comprises a fatty acid ester of sorbitan or sorbitol, or derivative thereof, and a hydrocarbon dispersion medium. The fatty acid ester includes a lauric acid ester and at least one kind of other ester selected from the group consisting of palmitic acid esters, stearic acid esters and behenic acid esters. The proportion of the peak area for lauric acid ester is 30-60%, based on the total peak area for fatty acid esters in the GPC chromatogram obtained from the fatty acid esters, and the proportion of the total peak area for other ester is 10-50%.Type: ApplicationFiled: January 22, 2013Publication date: June 11, 2015Inventors: Kenji Tanimura, Hiroki Yabuguchi, Yuichi Onoda, Masayoshi Handa
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Patent number: 8981176Abstract: The object of the present invention is to provide a water-absorbing resin compound, wherein the water-absorbing resin compound can retain antibacterial properties of an antibacterial metal to suppress the emission of unpleasant odors even when an organic material exists in a system in the case of using an eluting-type antibacterial agent. Thus, the present invention relates to a water-absorbing resin compound, which comprises a water-absorbing resin, an antibacterial agent having a porous material incorporating an antibacterial metal, and a metal chelating agent.Type: GrantFiled: November 30, 2010Date of Patent: March 17, 2015Assignee: Sumitomo Seika Chemicals Co., Ltd.Inventors: Takayasu Taniguchi, Masayoshi Handa, Yasuhiro Nawata
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Patent number: 8969497Abstract: A method for producing a water-absorbent resin including the step of subjecting a water-soluble ethylenically unsaturated monomer to a reversed phase suspension polymerization in a petroleum hydrocarbon dispersion medium in the presence of a radical polymerization initiator and a dispersion stabilizer, wherein the method is characterized by the use of an ether-ester type nonionic surfactant as the dispersion stabilizer, and a water-absorbent resin obtained by the method, wherein the water-absorbent resin has a water-retention capacity of saline solution of 25 g/g or more, a water-absorption rate of saline solution of 50 seconds or less, and a flow index under moisture absorption of 70% or more. According to the method of the present invention, a water-absorbent resin having high water-retention capacity, excellent water-absorption rate, and further having excellent flowability under moisture absorption can be produced.Type: GrantFiled: August 23, 2012Date of Patent: March 3, 2015Assignee: Sumitomo Seika Chemicals Co., Ltd.Inventors: Masayoshi Handa, Junichi Takatori
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Publication number: 20140243478Abstract: There is disclosed a method for producing water-absorbent resin particles, comprising a polymerization step that includes mixing an oily liquid comprising a hydrocarbon dispersing medium and a surfactant, and an aqueous liquid comprising an aqueous solvent and a water-soluble ethylenically unsaturated monomer, forming a suspension comprising an oily liquid and an aqueous liquid dispersed in the oily liquid, and polymerizing the water-soluble ethylenically unsaturated monomer in the suspension. The HLB of the surfactant is 6 or greater, and the temperature of the suspension is kept at 35° C. or higher during the period from initial mixing of the oily liquid and aqueous liquid until complete mixing of the entire amounts.Type: ApplicationFiled: September 24, 2012Publication date: August 28, 2014Inventors: Atsushi Heguri, Kenji Tanimura, Yuichi Onoda, Masayoshi Handa
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Patent number: 8802918Abstract: A water-absorbent sheet composition containing a structure in which an absorbent layer containing a water-absorbent resin and an adhesive is sandwiched with two or more sheets of hydrophilic nonwoven fabrics, wherein the water-absorbent sheet composition has a structure in which the absorbent layer is separated in divided parts of a primary absorbent layer and a secondary absorbent layer with a water-permeable substrate having a water permeability index of from 20 to 90, and wherein the water-absorbent resin is contained in the absorbent layer in an amount of from 100 to 1000 g/m2. The water-absorbent sheet composition of the present invention exhibits some excellent effects that the water-absorbent sheet composition is capable of accomplishing thinning and avoidance of gel blocking phenomenon and liquid leakage, while obtaining basic properties as a water-absorbent sheet composition at a high level, even for a water-absorbent sheet composition containing a very small amount of pulps.Type: GrantFiled: June 29, 2009Date of Patent: August 12, 2014Assignee: Sumitomo Seika Chemicals Co., Ltd.Inventors: Shinya Fukudome, Junichi Maruo, Masayoshi Handa, Kiyoshi Yamaguchi
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Publication number: 20140194574Abstract: A method for producing a water-absorbent resin including the step of subjecting a water-soluble ethylenically unsaturated monomer to a reversed phase suspension polymerization in a petroleum hydrocarbon dispersion medium in the presence of a radical polymerization initiator and a dispersion stabilizer, wherein the method is characterized by the use of an ether-ester type nonionic surfactant as the dispersion stabilizer, and a water-absorbent resin obtained by the method, wherein the water-absorbent resin has a water-retention capacity of saline solution of 25 g/g or more, a water-absorption rate of saline solution of 50 seconds or less, and a flow index under moisture absorption of 70% or more. According to the method of the present invention, a water-absorbent resin having high water-retention capacity, excellent water-absorption rate, and further having excellent flowability under moisture absorption can be produced.Type: ApplicationFiled: August 23, 2012Publication date: July 10, 2014Applicant: SUMITOMO SEIKA CHEMICALS CO., LTD.Inventors: Masayoshi Handa, Junichi Takatori
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Publication number: 20140127510Abstract: Disclosed is a water-absorbent resin particle in which the water-absorption rate of physiological saline is 1 second to 15 seconds, the median particle size is 100 ?m to 600 ?m, and the residual volatile component content is 1.5% by weight or less.Type: ApplicationFiled: July 23, 2012Publication date: May 8, 2014Applicant: SUMITOMO SEIKA CHEMICALS CO., LTD.Inventors: Masayoshi Handa, Kenji Tanimura, Atsushi Heguri, Yuichi Onoda
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Publication number: 20130274088Abstract: A method for producing a water-absorbent resin by a reversed-phase suspension polymerization method, includes step 1 of dispersing a first aqueous solution containing a partially neutralized product (A) of a water-soluble ethylenically unsaturated monomer having acid groups in the molecule in a petroleum-type hydrocarbon dispersion medium in the presence of a dispersing agent, and then polymerizing the resulting dispersion to obtain a slurry containing primary particles of a polymer, and step 2 of adding a second aqueous solution containing a partially neutralized product (B) of a water-soluble ethylenically unsaturated monomer having acid groups in the molecule to the slurry obtained in step 1, and then polymerizing the mixture to obtain a slurry in which the primary particles are agglomerated.Type: ApplicationFiled: January 23, 2012Publication date: October 17, 2013Applicant: SUMITOMO SEIKA CHEMICALS CO., LTD.Inventors: Masayoshi Handa, Koji Ueda, Kimihiko Kondo
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Publication number: 20130217846Abstract: Object An object of the present invention is to provide a process for producing a water-absorbent resin by employing a reversed suspension polymerization method, by which a water-absorbent resin having a small particle size and a narrow particle size distribution can be produced. Means for Achieving the Object A process for producing a water-absorbent resin comprising subjecting a water-soluble ethylenically unsaturated monomer to a reversed phase suspension polymerization in a petroleum hydrocarbon dispersion medium containing a surfactant and a polymeric dispersion agent, wherein the polymeric dispersion agent is a polymeric protective colloid having a weight average molecular weight (Mw) of 2,000 to 15,000 and a molecular weight distribution (Mw/number average molecular weight (Mn)) of 3 to 50.Type: ApplicationFiled: October 14, 2011Publication date: August 22, 2013Applicant: SUMITOMO SEIKA CHEMICALS CO., LTD.Inventors: Junichi Takatori, Masayoshi Handa, Kimihiko Kondo
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Publication number: 20130158495Abstract: Object The main object of the present invention is to provide a water-absorbent resin having a suitable particle size, strong particle strength, excellent adhesion to fibers, and excellent flowability as powders as well as properties suitable for a water-absorbent material used in a hygienic material, such as excellent general absorption properties as a water-absorbent resin, and to provide a process for producing the same. Another object of the present invention is to provide an absorbent material and an absorbent article using the water-absorbent resin. Means for Achieving the Object A water-absorbent resin having an aspect ratio of 1.0 to 3.0 and a median particle size (D) of 100 to 2,000 ?m in which primary particles having an aspect ratio of 1.1 to 200 and a median particle size (d) of 50 to 600 ?m are agglomerated.Type: ApplicationFiled: September 2, 2011Publication date: June 20, 2013Applicant: SUMITOMO SEIKA CHEMICALS CO., LTD.Inventors: Masayoshi Handa, Yuichi Onoda, Koji Ueda
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Publication number: 20130130017Abstract: Object: The main object of the present invention is to provide a water-absorbent resin that has an appropriate absorption capacity and excellent flow-through properties and that is suitably used in an absorbent article applied to a hygienic material, etc. Means for Achieving the Object: A water-absorbent resin formed by agglomerating primary particles according to a reversed-phase suspension polymerization method, the primary particles being obtained by polymerizing at least one water-soluble ethylenically unsaturated monomer in the presence of a dispersion stabilizer according to a reversed-phase suspension polymerization method, the primary particles having a median particle size of 100 to 250 ?m, and the water-absorbent resin having a water-retention capacity of saline solution of 30 g/g or less.Type: ApplicationFiled: August 3, 2011Publication date: May 23, 2013Applicant: SUMITOMO SEIKA CHEMICALS CO., LTD.Inventors: Junichi Takatori, Kimihiko Kondo, Masayoshi Handa
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Patent number: 8378033Abstract: The present invention relates to a method of producing water-absorbent resin particles in which a median particle size of primary particles (d) and a median particle size of secondary particles (D) satisfy the relationship of the formula, 5d/3+150<D<5d+150, comprising the steps of: (1) subjecting a water-soluble ethylenically unsaturated monomer to a first-step reversed phase suspension polymerization reaction, in a petroleum hydrocarbon solvent, in the presence of a dispersion stabilizer, to give spherical primary particles having a median particle size (d) of from 30 to 130 ?m; (2) cooling the polymerization reaction solution, to precipitate the dispersion stabilizer; and (3) carrying out a second-step reversed phase suspension polymerization reaction by adding the water-soluble ethylenically unsaturated monomer for the second step to the polymerization reaction solution to agglomerate the primary particles, to give secondary particles having a median particle size (D) of from 200 to 500 ?m.Type: GrantFiled: April 20, 2007Date of Patent: February 19, 2013Assignee: Sumitomo Seika Chemicals Co., Ltd.Inventors: Masayoshi Handa, Yasuhiro Nawata