公开(公告)号：US20230226520A1

公开(公告)日：2023-07-20

申请号：US18000970

申请日：2021-06-07

Applicant: KURARAY CO., LTD.

Inventor： Takumi TAKAYAMA ,  Kazuhiko MAEKAWA ,  Kazutoshi MISHIMA

IPC: B01J20/26 ,  C08F297/02 ,  B01J20/28 ,  A61L15/24 ,  A23L3/3517

CPC classification number: B01J20/264 ,  C08F297/026 ,  B01J20/28016 ,  A61L15/24 ,  A23L3/3517 ,  A01K1/0155

Abstract: 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.

公开(公告)号：US20240174785A1

公开(公告)日：2024-05-30

申请号：US18548377

申请日：2022-03-10

Applicant: KURARAY CO., LTD.

Inventor： Takumi TAKAYAMA ,  Hinako TSUCHIYA ,  Kazuhiko MAEKAWA

IPC: C08F293/00

CPC classification number: C08F293/00

Abstract: 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.

公开(公告)号：US20220267499A1

公开(公告)日：2022-08-25

申请号：US17623105

申请日：2020-06-25

Applicant: KURARAY CO., LTD.

Inventor： Takumi TAKAYAMA ,  Kazutoshi MISHIMA ,  Hiroyuki KONISHI ,  Kazuhiko MAEKAWA

IPC: C08F293/00 ,  C08F4/70 ,  C08L53/00

Abstract: 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. The copolymer has a fine balance derived from the copolymer block (B-c) of having a superior solubility in water while being unlikely to undergo thickening or gelation due to pH fluctuation, and also has high mechanic strength derived from the vinyl alcohol-based polymer block (B-b).

公开(公告)号：US20200216584A1

公开(公告)日：2020-07-09

申请号：US16630282

申请日：2018-07-11

Applicant: KURARAY CO., LTD. ,  UNIVERSITE DE LIEGE

Inventor： Takumi TAKAYAMA ,  Kazuhiko MAEKAWA ,  Christophe DETREMBLEUR ,  Antoine DEBUIGNE ,  Christine JEROME

IPC: C08F16/06 ,  C08F8/12 ,  C08F2/38

Abstract: 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≥0.5  (1)

公开(公告)号：US20190119414A1

公开(公告)日：2019-04-25

申请号：US16089483

申请日：2017-03-30

Applicant: KURARAY CO., LTD. ,  UNIVERSITE DE LIEGE

Inventor： Takumi TAKAYAMA ,  Yusuke AMANO ,  Kazuhiko MAEKAWA ,  Christophe DETREMBLEUR ,  Antoine DEBUIGNE ,  Christine JEROME

IPC: C08F16/06 ,  C08F18/08 ,  C08F8/12 ,  B01J31/22

Abstract: 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.

公开(公告)号：US20190100607A1

公开(公告)日：2019-04-04

申请号：US16089441

申请日：2017-03-30

Applicant: KURARAY CO., LTD.

Inventor： Yusuke AMANO ,  Takumi TAKAYAMA ,  Kazuhiko MAEKAWA ,  Kazuhiko MAEKAWA

IPC: C08F16/06

Abstract: 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. X·Mn≤1000  (1)

公开(公告)号：US20150224472A1

公开(公告)日：2015-08-13

申请号：US14692986

申请日：2015-04-22

Applicant: KURARAY CO., LTD.

Inventor： Keisuke MORIKAWA ,  Yusuke AMANO ,  Naoyuki IWACHIDO ,  Naoki FUJIWARA ,  Takumi TAKAYAMA

IPC: B01J20/26 ,  C08J3/12 ,  B01J39/18 ,  C08F261/04 ,  B01J20/28 ,  B01J20/30

CPC classification number: B01J20/264 ,  B01D15/00 ,  B01J20/28004 ,  B01J20/28016 ,  B01J20/28083 ,  B01J20/28085 ,  B01J20/30 ,  B01J20/3014 ,  B01J20/3028 ,  B01J20/3071 ,  B01J20/3078 ,  B01J20/3085 ,  B01J20/321 ,  B01J20/3212 ,  B01J20/3219 ,  B01J20/3272 ,  B01J20/3278 ,  B01J20/3293 ,  B01J20/3425 ,  B01J20/3475 ,  B01J39/18 ,  C02F1/285 ,  C02F2101/20 ,  C02F2101/22 ,  C08F8/32 ,  C08F255/02 ,  C08F261/04 ,  C08F271/02 ,  C08J3/12 ,  C08J9/26 ,  C08J2201/046 ,  C08J2323/08 ,  C08J2329/04 ,  C08J2351/06 ,  C08J2429/04 ,  C08J2451/06 ,  C22B3/24 ,  Y02P10/234 ,  Y10T428/2982 ,  C08F220/32 ,  C08F220/28 ,  C08F220/54

Abstract: 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 μm) 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.

Abstract translation: 提供能够引入吸附金属等的吸附官能团的接枝共聚物颗粒，其制造方法和使用它们的吸附剂。 （1）含有接枝链的多孔接枝共聚物颗粒，其导入到多孔颗粒（平均孔径为0.01〜50μm的颗粒表面）中，包含至少一种选自烯烃树脂，水不溶性改性聚乙烯醇树脂，酰胺树脂，纤维素 树脂，壳聚糖树脂和（甲基）丙烯酸酯树脂。 （2）一种生产多孔接枝共聚物颗粒的方法，其包括（I）熔融捏合除聚合物A以外的聚合物A和聚合物B以获得复合材料，（II）从复合材料中提取和除去聚合物B至 获得聚合物A的多孔材料，（III）对多孔材料进行造粒，和（IV）将接枝链引入多孔颗粒中。 （3）多孔接枝共聚物颗粒的吸附剂。