公开(公告)号：US20190023825A1

公开(公告)日：2019-01-24

申请号：US16139312

申请日：2018-09-24

Applicant: KURARAY CO., LTD.

Inventor： Michael Collins ,  Ghebrehiwet Ghebremeskel ,  Masaki Kato ,  Keisuke Morikawa ,  Yoriko Imaoka

IPC: C08F216/06 ,  C09D129/04 ,  C08F8/12 ,  C08J3/12 ,  D21H19/60 ,  C08F6/02 ,  C08F16/06 ,  C08F116/06 ,  C08F6/00

Abstract: The present invention relates generally to a polyvinyl alcohol composition having higher amorphous polyvinyl alcohol polymer content and various end uses thereof.

公开(公告)号：US09943825B2

公开(公告)日：2018-04-17

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: B01J20/00 ,  B32B5/16 ,  B01J20/26 ,  B01D15/00 ,  B01J20/30 ,  C08F255/02 ,  C08J9/26 ,  C22B3/24 ,  B01J20/34 ,  B01J20/32 ,  B01J20/28 ,  B01J39/18 ,  C08F261/04 ,  C08J3/12 ,  C08F271/02 ,  C08F8/32 ,  C02F1/28 ,  C02F101/20 ,  C02F101/22

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.

公开(公告)号：US20140350169A1

公开(公告)日：2014-11-27

申请号：US14371508

申请日：2012-12-25

Applicant: KURARAY CO., LTD.

Inventor： Takuma Kaneshima ,  Yusuke Amano ,  Keisuke Morikawa ,  Naoki Fujiwara ,  Kensuke Nagashima ,  Katsuji Ujita

IPC: C08F28/02 ,  C08L41/00 ,  C09D141/00 ,  C08F28/06

CPC classification number: C08F28/02 ,  C08F8/00 ,  C08F8/12 ,  C08F28/06 ,  C08F216/06 ,  C08F2810/20 ,  C08L41/00 ,  C09D141/00 ,  D21H17/36 ,  D21H19/20 ,  D21H21/16 ,  C08F218/08 ,  C08F218/12 ,  C08F2220/585 ,  C08F228/02 ,  C08L77/00

Abstract: The present invention provides a vinyl alcohol polymer having a mercapto group and having excellent reactivity. The present invention is a side-chain mercapto group-containing vinyl alcohol polymer including vinyl alcohol units and structural units represented by the following formula (I) (the characters in the formula are as defined in the description):

Abstract translation: 本发明提供具有巯基的具有优异的反应性的乙烯醇聚合物。 本发明是含有乙烯醇单元的侧链巯基乙烯醇系聚合物和下述式（I）所示的结构单元（式中的字符如说明书中所定义）：

公开(公告)号：US12286548B2

公开(公告)日：2025-04-29

申请号：US17041807

申请日：2019-03-25

Applicant: KURARAY CO., LTD.

Inventor： Keisuke Morikawa ,  Tatsuya Tanida ,  Yuta Taoka

IPC: C09D129/04 ,  C08K3/013 ,  C08K5/00 ,  C09D133/02 ,  C09J129/04 ,  C09J133/02 ,  D21H19/20

Abstract: The present invention provides a coating agent having a reduced methanol content, an adhesive including the coating agent and excellent in coating performance and adhesiveness, and a coated product including the coating agent and excellent in water resistance and alcohol resistance. The present invention relates to a coating agent comprising a modified vinyl alcohol polymer (A), the modified vinyl alcohol polymer (A) comprising a structural unit derived from a derivative (a) of an ethylenically unsaturated dicarboxylic acid in a content (X) of 0.05 mol % or more and 10 mol % or less, having a degree of saponification of 80.0 mol % or more and 99.9 mol % or less, having a methanol content of less than 3.0 mass % as measured by headspace gas chromatography, and having an amount of 0.1 ppm or more and less than 2,000 ppm of a component insoluble in a 90° C., 5 mass % aqueous solution.

公开(公告)号：US12280409B2

公开(公告)日：2025-04-22

申请号：US17718176

申请日：2022-04-11

Applicant: KURARAY CO., LTD.

Inventor： Keisuke Morikawa ,  Pablo Garcia ,  Levi Neufeld

IPC: B09C1/08 ,  A01M13/00 ,  C09K17/52 ,  D21H19/40 ,  D21H19/60

Abstract: The present disclosure relates to a barrier paper comprising a paper coated with polyvinyl alcohol composition, and a method for reducing diffusion of soil fumigant using the same.

公开(公告)号：US12065599B2

公开(公告)日：2024-08-20

申请号：US17406532

申请日：2021-08-19

Applicant: Kuraray Co., Ltd.

Inventor： Ghebrehiwet Ghebremeskel ,  Keisuke Morikawa ,  Takuma Kaneshima

IPC: E21B43/26 ,  C09K8/508 ,  C09K8/516 ,  C09K8/582 ,  E21B21/00

CPC classification number: C09K8/516 ,  C09K8/5083 ,  E21B21/003 ,  C09K2208/08

Abstract: Disclosed are compositions and kits of fibers and acid-functional vinyl alcohol polymers, wherein such compositions and kits are useful for wellbore remediation as applied to a subterranean formation traversed by the borehole of an oil or gas well.

公开(公告)号：US20210238467A1

公开(公告)日：2021-08-05

申请号：US17160445

申请日：2021-01-28

Applicant: KURARAY CO., LTD.

Inventor： Ghebrehiwet Ghebremeskel ,  Keisuke Morikawa ,  Yasuhiro Tajima

IPC: C09K8/508 ,  E21B43/16 ,  C09K8/588

Abstract: A particulate plugging agent, such as a diverting agent and/or loss circulation material, using a particular polyvinyl alcohol with a certain amount of monovalent metallic salt, which is water-soluble and has a buffer effect even if the environment is acidic, and thus stable, which in particular finds use in various subsurface oil production operations.

公开(公告)号：US09908961B2

公开(公告)日：2018-03-06

申请号：US14728279

申请日：2015-06-02

Applicant: KURARAY CO., LTD.

Inventor： Takuma Kaneshima ,  Yusuke Amano ,  Keisuke Morikawa

IPC: C08F265/04 ,  B01J39/20 ,  B01J47/12 ,  B01D71/38 ,  B01D71/78 ,  B01D71/82 ,  C08F2/38 ,  C08F261/04 ,  B01J41/14

CPC classification number: C08F265/04 ,  B01D71/38 ,  B01D71/78 ,  B01D71/82 ,  B01D2323/38 ,  B01J39/20 ,  B01J41/14 ,  B01J47/12 ,  C08F2/38 ,  C08F261/04 ,  C08F222/06

Abstract: Provided are (1) a vinyl alcohol graft copolymer grafting polymerizable unsaturated monomers as a graft chain onto a side-chain mercapto group-containing vinyl alcohol polymer backbone, the graft chain being attached to the polymer backbone at a mercapto group, and the backbone including: a vinyl alcohol unit and a unit represented by the following formula (I): wherein R1 is a hydrogen atom or a carboxyl group; R2 is a hydrogen atom, a methyl group, a carboxyl group, or a carboxymethyl group; and X is a divalent C1-22 group which contains a carbon atom and a hydrogen atom and may contain a nitrogen atom and/or an oxygen atom; and (2) an ion-exchange membrane having controlled swelling in water and excellent flex resistance, the membrane including a vinyl alcohol graft copolymer as described above.

公开(公告)号：US09611344B2

公开(公告)日：2017-04-04

申请号：US14371508

申请日：2012-12-25

Applicant: KURARAY CO., LTD.

Inventor： Takuma Kaneshima ,  Yusuke Amano ,  Keisuke Morikawa ,  Naoki Fujiwara ,  Kensuke Nagashima ,  Katsuji Ujita

IPC: C08F28/02 ,  C08F8/00 ,  C08F216/06 ,  C08F28/06 ,  C08F8/12 ,  C08L41/00 ,  C09D141/00 ,  D21H19/20 ,  D21H17/36 ,  D21H21/16

CPC classification number: C08F28/02 ,  C08F8/00 ,  C08F8/12 ,  C08F28/06 ,  C08F216/06 ,  C08F2810/20 ,  C08L41/00 ,  C09D141/00 ,  D21H17/36 ,  D21H19/20 ,  D21H21/16 ,  C08F218/08 ,  C08F218/12 ,  C08F2220/585 ,  C08F228/02 ,  C08L77/00

Abstract: The present invention provides a vinyl alcohol polymer having a mercapto group and having excellent reactivity. The present invention is a side-chain mercapto group-containing vinyl alcohol polymer including vinyl alcohol units and structural units represented by the following formula (I) (the characters in the formula are as defined in the description):

公开(公告)号：US11787928B2

公开(公告)日：2023-10-17

申请号：US17159254

申请日：2021-01-27

Applicant: KURARAY CO., LTD.

Inventor： Ghebrehiwet Ghebremeskel ,  Keisuke Morikawa ,  Richard Cazares ,  Masaki Kato

IPC: C08L29/04 ,  C09K8/12 ,  C08J3/12

CPC classification number: C08L29/04 ,  C08J3/12 ,  C09K8/12 ,  C08L2205/03

Abstract: Disclosed are particulate polyvinyl alcohol-based compositions for use in manufacturing chemical materials and in other industrial operations, and for treatments applied to a subterranean formation traversed by the borehole of an oil or gas well, which compositions are prepared by granulating polyvinyl alcohol polymers, and admixing the granules so produced with powder and/or crushing the granules to a specified particle size distribution.