公开(公告)号：US20140350169A1

公开(公告)日：2014-11-27

申请号：US14371508

申请日：2012-12-25

申请人： KURARAY CO., LTD.

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

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

CPC分类号： 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

摘要： 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):

摘要翻译： 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：US20220056330A1

公开(公告)日：2022-02-24

申请号：US17406532

申请日：2021-08-19

申请人： Kuraray Co., Ltd.

发明人： Ghebrehiwet Ghebremeskel ,  Keisuke Morikawa ,  Takuma Kaneshima

IPC分类号： C09K8/516 ,  C09K8/508 ,  E21B21/00

摘要： 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：US20210380864A1

公开(公告)日：2021-12-09

申请号：US17327291

申请日：2021-05-21

申请人： Kuraray Co., Ltd.

发明人： Ghebrehiwet Ghebremeskel ,  Takuma Kaneshima ,  Keisuke Morikawa ,  Amanda Reneau

IPC分类号： C09K8/508 ,  E21B33/138

摘要： Disclosed are particulate compositions comprising particles of a blend of one or more polyvinyl alcohol polymers with one or more aliphatic polyester polymers, wherein such particulate compositions are useful, for example, as plugging agents for treatments applied to a subterranean formation traversed by the borehole of an oil or gas well.

公开(公告)号：US11767462B2

公开(公告)日：2023-09-26

申请号：US17327291

申请日：2021-05-21

申请人： Kuraray Co., Ltd.

发明人： Ghebrehiwet Ghebremeskel ,  Takuma Kaneshima ,  Keisuke Morikawa ,  Amanda Reneau

IPC分类号： C09K8/508 ,  E21B33/138

CPC分类号： C09K8/5083 ,  C09K8/5086 ,  E21B33/138

摘要： Disclosed are particulate compositions comprising particles of a blend of one or more polyvinyl alcohol polymers with one or more aliphatic polyester polymers, wherein such particulate compositions are useful, for example, as plugging agents for treatments applied to a subterranean formation traversed by the borehole of an oil or gas well.

公开(公告)号：US20230212339A1

公开(公告)日：2023-07-06

申请号：US17928011

申请日：2021-05-24

申请人： KURARAY CO., LTD.

发明人： Ghebrehiwet Ghebremeskel ,  Keisuke Morikawa ,  Takuma Kaneshima

IPC分类号： C08F216/06 ,  C08K11/00

CPC分类号： C08F216/06 ,  C08K11/00

摘要： A vinyl alcohol copolymer, wherein the vinyl alcohol copolymer includes a vinyl alcohol unit and a constituent unit derived from an unsaturated monomer (A), the unsaturated monomer (A) is at least one selected from the group consisting of an unsaturated carboxylic acid, a salt thereof, an anhydride thereof, and an alkyl ester thereof, a content of the constituent unit derived from the unsaturated monomer (A) with respect to total constituent units of the vinyl alcohol copolymer is 1.00 mol % or more and 5.00 mol % or less, and 70 mol % or more of the constituent unit derived from the unsaturated monomer (A) forms a lactone ring structure.

公开(公告)号：US11384276B2

公开(公告)日：2022-07-12

申请号：US17183407

申请日：2021-02-24

申请人： KURARAY CO., LTD.

发明人： Ghebrehiwet Ghebremeskel ,  Keisuke Morikawa ,  Takuma Kaneshima

IPC分类号： C09K8/508 ,  C08F216/06 ,  C08F210/02 ,  E21B33/13 ,  C09K8/504

摘要： A particulate compacted copolymer polyvinyl alcohol-based composition that can be used as a plugging agent for minimizing or eliminating loss of circulation of fluids during the process of well drilling, workover, completion and cementing in the production of oil and gas.

公开(公告)号：US11091574B2

公开(公告)日：2021-08-17

申请号：US16304842

申请日：2017-05-25

申请人： KURARAY CO., LTD.

发明人： Takuma Kaneshima

IPC分类号： C08F2/38 ,  C08F2/06 ,  C08F4/34 ,  C08F8/12 ,  C08F216/06 ,  C08F118/08

摘要： The present invention provides an industrially advantageous method for producing vinyl alcohol polymers having a low degree of polymerization using a chain transfer agent having an aliphatic hydrocarbon group having 6 to 12 carbon atoms, the method being capable of producing a vinyl alcohol polymer whose aqueous solution has excellent viscosity stability. The present invention relates to a method for producing vinyl alcohol polymers, including: polymerizing a vinyl ester monomer (a) in the presence of a polymerization initiator (B) and a chain transfer agent (C) having an aliphatic hydrocarbon group having 6 to 12 carbon atoms to obtain a vinyl ester polymer (A); and saponifying the vinyl ester polymer (A) at a concentration of 40 mass % or more and 75 mass % or less in the presence of an acidic catalyst (D) to obtain a vinyl alcohol polymer, wherein the vinyl alcohol polymer has a viscosity-average degree of polymerization of 160 or more and 400 or less.

公开(公告)号：US12065599B2

公开(公告)日：2024-08-20

申请号：US17406532

申请日：2021-08-19

申请人： Kuraray Co., Ltd.

发明人： Ghebrehiwet Ghebremeskel ,  Keisuke Morikawa ,  Takuma Kaneshima

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

CPC分类号： C09K8/516 ,  C09K8/5083 ,  E21B21/003 ,  C09K2208/08

摘要： 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：US10919012B2

公开(公告)日：2021-02-16

申请号：US15758596

申请日：2016-09-14

申请人： KURARAY CO., LTD.

发明人： Takuma Kaneshima ,  Yosuke Kumaki

IPC分类号： B01F17/00 ,  C09K8/588 ,  C09K8/035 ,  C08L91/00 ,  C08F216/06 ,  C08F16/06 ,  C08L29/04

摘要： Provided is a crude oil dispersion stabilizer containing a vinyl alcohol-based polymer, wherein a degree of saponification of the vinyl alcohol-based polymer is greater than 70 mol % and 82 mol % or less, and the total content of carboxyl groups and lactone rings is 0.02 to 1 mol % relative to all structural units of the vinyl alcohol-based polymer. According to this, there is provided a crude oil dispersion stabilizer capable of dispersing or emulsifying a highly viscous crude oil, thereby reducing the viscosity and allowing the resulting crude oil dispersion liquid or emulsion to be present stably for a long time.

公开(公告)号：US09908961B2

公开(公告)日：2018-03-06

申请号：US14728279

申请日：2015-06-02

申请人： KURARAY CO., LTD.

发明人： Takuma Kaneshima ,  Yusuke Amano ,  Keisuke Morikawa

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

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

摘要： 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.