Patents by Inventor Takumi TAKAYAMA
Takumi TAKAYAMA 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: 12264215Abstract: Disclosed is a vinyl alcohol-based block copolymer that is a block copolymer composed of a vinyl alcohol-based polymer block (B-b) and a copolymer block (B-c) comprising a vinyl alcohol-based monomer unit and an acrylic acid-based monomer unit, wherein a content (Z) of the acrylic acid-based monomer unit relative to all monomer units is 0.05 to 20.0 mol %, the block copolymer has a saponification degree of 80 to 99.99 mol %, the block copolymer has a number-average molecular weight (Mna) of 20,000 to 440,000, the block copolymer has a molecular weight distribution (Mwa/Mna) of 1.05 to 1.95, and a ratio (DPb/DPa) of a number-average polymerization degree (DPb) of the vinyl alcohol-based polymer block (B-b) to the number-average polymerization degree (DPa) of the block copolymer is 0.010 to 0.999.Type: GrantFiled: June 25, 2020Date of Patent: April 1, 2025Assignee: KURARAY CO., LTD.Inventors: Takumi Takayama, Kazutoshi Mishima, Hiroyuki Konishi, Kazuhiko Maekawa
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Publication number: 20240425625Abstract: The present invention provides a preparing method of a polymer which is low-toxic, environmental-friendly, highly controllable, and low cost to obtain a polymer with high molecular weight. The preparing method comprises conducting a controlled radical polymerization process of monomer (Y). In the controlled radical polymerization process, organic compound (A) which has the formula (I) and radical initiator (B) are existing in a mole ratio (B/A) ranged from 0.5 to 25, wherein R1 is a hydrogen atom, alkyl group, aryl group, or hydroxyl group, the alkyl group can be alkyl having substituents or alkyl substituent, and the aryl group can be aryl having substituents or aryl substituent.Type: ApplicationFiled: September 9, 2024Publication date: December 26, 2024Inventors: Takumi Takayama, Kazuhiko Maekawa, Tomoya Hosoki, Chi-How Peng
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Patent number: 12134665Abstract: The present invention provides a preparing method of a polymer which is low-toxic, environmental-friendly, highly controllable, and low cost to obtain a polymer with high molecular weight. The preparing method comprises conducting a controlled radical polymerization process of monomer (Y). In the controlled radical polymerization process, organic compound (A) which has the formula (I) and radical initiator (B) are existing in a mole ratio (B/A) ranged from 0.5 to 25, wherein R1 is a hydrogen atom, alkyl group, aryl group, or hydroxyl group, the alkyl group can be alkyl having substituents or alkyl substituent, and the aryl group can be aryl having substituents or aryl substituent.Type: GrantFiled: March 25, 2022Date of Patent: November 5, 2024Assignee: NATIONAL TSING HUA UNIVERSITYInventors: Takumi Takayama, Kazuhiko Maekawa, Tomoya Hosoki, Chi-How Peng
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Publication number: 20240174785Abstract: A method of producing a polymer including a polymerization step of obtaining a polymer by controlled radical polymerization of a monomer (Y) in the presence of an organic compound (A) represented by formula (I) and its constituents and a radical generator (B), where a molar ratio (B/A) of (B) to (A) is from 0.5 to 20. The production method allows synthesis of a highly safe polymer with a high molecular weight while precisely controlling the molecular sequence and the end structure. In addition, the production method is low in toxicity, environmentally friendly, and operated at low costs.Type: ApplicationFiled: March 10, 2022Publication date: May 30, 2024Applicant: KURARAY CO., LTD.Inventors: Takumi TAKAYAMA, Hinako TSUCHIYA, Kazuhiko MAEKAWA
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Publication number: 20230226520Abstract: A block copolymer (A) including a vinyl alcohol-based polymer block (b) and an ionic polymer block (c) containing a monomer unit with an ionic group forming a salt and a vinyl alcohol-based monomer unit. The ionic group is a carboxylic acid group, a sulfonic acid group, or an ammonium group. The vinyl alcohol-based polymer block (b) has a number-average molecular weight (Mnb) from 15,000 to 220,000. The ionic polymer block (c) has a content of the vinyl alcohol-based monomer unit from 5 to 95 mol % based on the total monomer units. The block copolymer (A) has a number-average molecular weight (MnA) from 20,000 to 440,000. A ratio (Mnb/MnA) of the number-average molecular weight (Mnb) to the number-average molecular weight (MnA) is from 0.1 to 0.9.Type: ApplicationFiled: June 7, 2021Publication date: July 20, 2023Applicant: KURARAY CO., LTD.Inventors: Takumi TAKAYAMA, Kazuhiko MAEKAWA, Kazutoshi MISHIMA
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Publication number: 20220325013Abstract: The present invention provides a preparing method of a polymer which is low-toxic, environmental-friendly, highly controllable, and low cost to obtain a polymer with high molecular weight. The preparing method comprises conducting a controlled radical polymerization process of monomer (Y). In the controlled radical polymerization process, organic compound (A) which has the formula (I) and radical initiator (B) are existing in a mole ratio (B/A) ranged from 0.5 to 25, wherein R1 is a hydrogen atom, alkyl group, aryl group, or hydroxyl group, the alkyl group can be alkyl having substituents or alkyl substituent, and the aryl group can be aryl having substituents or aryl substituent.Type: ApplicationFiled: March 25, 2022Publication date: October 13, 2022Inventors: Takumi Takayama, Kazuhiko Maekawa, Tomoya Hosoki, Chi-How Peng
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Publication number: 20220267499Abstract: Disclosed is a vinyl alcohol-based block copolymer that is a block copolymer composed of a vinyl alcohol-based polymer block (B-b) and a copolymer block (B-c) comprising a vinyl alcohol-based monomer unit and an acrylic acid-based monomer unit, wherein a content (Z) of the acrylic acid-based monomer unit relative to all monomer units is 0.05 to 20.0 mol %, the block copolymer has a saponification degree of 80 to 99.99 mol %, the block copolymer has a number-average molecular weight (Mna) of 20,000 to 440,000, the block copolymer has a molecular weight distribution (Mwa/Mna) of 1.05 to 1.95, and a ratio (DPb/DPa) of a number-average polymerization degree (DPb) of the vinyl alcohol-based polymer block (B-b) to the number-average polymerization degree (DPa) of the block copolymer is 0.010 to 0.999.Type: ApplicationFiled: June 25, 2020Publication date: August 25, 2022Applicant: KURARAY CO., LTD.Inventors: Takumi TAKAYAMA, Kazutoshi MISHIMA, Hiroyuki KONISHI, Kazuhiko MAEKAWA
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Patent number: 11261270Abstract: A polyvinyl alcohol has a number-average molecular weight (Mn) from 4,400 to 440,000, a molecular weight distribution (Mw/Mn) from 1.05 to 1.70, a degree of saponification from 80 to 99.99 mol %, wherein the polyvinyl alcohol contains an end group represented by a formula (I) below, and a molar ratio (X) of the end group based on total monomer units and the number-average molecular weight (Mn) satisfy a formula (1) below. Such a polyvinyl alcohol has a narrow molecular weight distribution and a high number-average molecular weight with hue good. (In the formula, R1 denotes an optionally substituted aromatic group having a carbon number from 6 to 20, and R2 denotes a hydrogen atom, an alkyl group having a carbon number from 1 to 20, or an optionally substituted aromatic group having a carbon number from 6 to 20.) X·Mn/44?0.Type: GrantFiled: July 11, 2018Date of Patent: March 1, 2022Assignees: KURARAY CO., LTD., UNIVERSITE DE LIEGEInventors: Takumi Takayama, Kazuhiko Maekawa, Christophe Detrembleur, Antoine Debuigne, Christine Jerome
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Patent number: 11111319Abstract: A polyvinyl alcohol has a number-average molecular weight (Mn) from 4,400 to 440,000, a molecular weight distribution (Mw/Mn) from 1.05 to 1.70, a degree of saponification from 80 to 99.99 mol %, and a carbon-carbon double bond content (X) of 0.1 mol % or less based on total monomer units, and satisfying a formula (1) below. A polyvinyl alcohol, having a narrow molecular weight distribution and a high number-average molecular weight with good hue, and a method for producing the same are thus provided.Type: GrantFiled: March 30, 2017Date of Patent: September 7, 2021Assignee: KURARAY CO., LTD.Inventors: Yusuke Amano, Takumi Takayama, Kazuhiko Maekawa
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Patent number: 10766978Abstract: A polyvinyl alcohol is produced in a method comprising: a polymerization step comprising polymerizing vinyl ester monomers by controlled radical polymerization in the presence of a radical initiator and an organic cobalt complex to obtain a polymer solution containing a polyvinyl ester; an extraction step comprising extracting a cobalt complex from the polymer solution by contacting an aqueous solution containing a water-soluble ligand with the polymer solution; and a saponification step comprising saponifying the polyvinyl ester after the extraction step to obtain a polyvinyl alcohol. A method for producing a polyvinyl alcohol is thus provided that has a narrow molecular weight distribution and a high number-average molecular weight with good hue and further good solubility in water.Type: GrantFiled: March 30, 2017Date of Patent: September 8, 2020Assignees: KURARAY CO., LTD., UNIVERSITE DE LIEGEInventors: Takumi Takayama, Yusuke Amano, Kazuhiko Maekawa, Christophe Detrembleur, Antoine Debuigne, Christine Jerome
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Publication number: 20200216584Abstract: A polyvinyl alcohol has a number-average molecular weight (Mn) from 4,400 to 440,000, a molecular weight distribution (Mw/Mn) from 1.05 to 1.70, a degree of saponification from 80 to 99.99 mol %, wherein the polyvinyl alcohol contains an end group represented by a formula (I) below, and a molar ratio (X) of the end group based on total monomer units and the number-average molecular weight (Mn) satisfy a formula (1) below. Such a polyvinyl alcohol has a narrow molecular weight distribution and a high number-average molecular weight with hue good. (In the formula, R1 denotes an optionally substituted aromatic group having a carbon number from 6 to 20, and R2 denotes a hydrogen atom, an alkyl group having a carbon number from 1 to 20, or an optionally substituted aromatic group having a carbon number from 6 to 20.) X·Mn/44?0.Type: ApplicationFiled: July 11, 2018Publication date: July 9, 2020Applicants: KURARAY CO., LTD., UNIVERSITE DE LIEGEInventors: Takumi TAKAYAMA, Kazuhiko MAEKAWA, Christophe DETREMBLEUR, Antoine DEBUIGNE, Christine JEROME
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Publication number: 20190119414Abstract: A polyvinyl alcohol is produced in a method comprising: a polymerization step comprising polymerizing vinyl ester monomers by controlled radical polymerization in the presence of a radical initiator and an organic cobalt complex to obtain a polymer solution containing a polyvinyl ester; an extraction step comprising extracting a cobalt complex from the polymer solution by contacting an aqueous solution containing a water-soluble ligand with the polymer solution; and a saponification step comprising saponifying the polyvinyl ester after the extraction step to obtain a polyvinyl alcohol. A method for producing a polyvinyl alcohol is thus provided that has a narrow molecular weight distribution and a high number-average molecular weight with good hue and further good solubility in water.Type: ApplicationFiled: March 30, 2017Publication date: April 25, 2019Applicants: KURARAY CO., LTD., UNIVERSITE DE LIEGEInventors: Takumi TAKAYAMA, Yusuke AMANO, Kazuhiko MAEKAWA, Christophe DETREMBLEUR, Antoine DEBUIGNE, Christine JEROME
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Publication number: 20190100607Abstract: A polyvinyl alcohol has a number-average molecular weight (Mn) from 4,400 to 440,000, a molecular weight distribution (Mw/Mn) from 1.05 to 1.70, a degree of saponification from 80 to 99.99 mol %, and a carbon-carbon double bond content (X) of 0.1 mol % or less based on total monomer units, and satisfying a formula (1) below. A polyvinyl alcohol, having a narrow molecular weight distribution and a high number-average molecular weight with good hue, and a method for producing the same are thus provided.Type: ApplicationFiled: March 30, 2017Publication date: April 4, 2019Applicant: KURARAY CO., LTD.Inventors: Yusuke AMANO, Takumi TAKAYAMA, Kazuhiko MAEKAWA, Kazuhiko MAEKAWA
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Patent number: 9943825Abstract: Provided are graft copolymer particles enabling introduction of adsorptive functional groups adsorbing metals and others, a method for producing same, and an adsorbent using same. (1) Porous graft copolymer particles containing graft chains introduced into porous particles (particle surface having an average pore diameter of 0.01-50 ?m) including at least one resin selected from olefin resins, water-insoluble modified polyvinyl alcohol resins, amide resins, cellulosic resins, chitosan resins and (meth)acrylate resins. (2) A method for producing porous graft copolymer particles including (I) melt-kneading a polymer A and a polymer B other than the polymer A to obtain a compound material, (II) extracting and removing the polymer B from the compound material to obtain a porous material of the polymer A, (III) granulating the porous material, and (IV) introducing graft chains into the porous particles. (3) An adsorbent of porous graft copolymer particles.Type: GrantFiled: April 22, 2015Date of Patent: April 17, 2018Assignee: KURARAY CO., LTD.Inventors: Keisuke Morikawa, Yusuke Amano, Naoyuki Iwachido, Naoki Fujiwara, Takumi Takayama
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Publication number: 20150224472Abstract: Provided are graft copolymer particles enabling introduction of adsorptive functional groups adsorbing metals and others, a method for producing same, and an adsorbent using same. (1) Porous graft copolymer particles containing graft chains introduced into porous particles (particle surface having an average pore diameter of 0.01-50 ?m) including at least one resin selected from olefin resins, water-insoluble modified polyvinyl alcohol resins, amide resins, cellulosic resins, chitosan resins and (meth)acrylate resins. (2) A method for producing porous graft copolymer particles including (I) melt-kneading a polymer A and a polymer B other than the polymer A to obtain a compound material, (II) extracting and removing the polymer B from the compound material to obtain a porous material of the polymer A, (III) granulating the porous material, and (IV) introducing graft chains into the porous particles. (3) An adsorbent of porous graft copolymer particles.Type: ApplicationFiled: April 22, 2015Publication date: August 13, 2015Applicant: KURARAY CO., LTD.Inventors: Keisuke MORIKAWA, Yusuke AMANO, Naoyuki IWACHIDO, Naoki FUJIWARA, Takumi TAKAYAMA