公开(公告)号：US20240376006A1

公开(公告)日：2024-11-14

申请号：US18691020

申请日：2022-09-09

Applicant: Kuraray Co., Ltd.

Inventor： Takuma KANESHIMA ,  JungYong KIM ,  Ghebrehiwet GHEBREMESKEL ,  Keisuke MORIKAWA

IPC: C04B24/26 ,  C04B22/00 ,  C04B103/00 ,  C04B103/46

Abstract: A cement composition containing a fluid loss control agent and a cement, wherein the fluid loss control agent contains a vinyl alcohol polymer and a crosslinking agent, and a swelling percentage of the fluid loss control agent is 200% or more and 3,600% or less.

公开(公告)号：US20200325259A1

公开(公告)日：2020-10-15

申请号：US16304842

申请日：2017-05-25

Applicant: KURARAY CO., LTD.

Inventor： Takuma KANESHIMA

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

Abstract: 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：US20180243706A1

公开(公告)日：2018-08-30

申请号：US15758596

申请日：2016-09-14

Applicant: KURARAY CO., LTD.

Inventor： Takuma KANESHIMA ,  Yosuke KUMAKI

IPC: B01F17/00 ,  C08L29/04 ,  C08F16/06

CPC classification number: B01F17/0028 ,  C08F16/06 ,  C08F216/06 ,  C08F2500/02 ,  C08L29/04 ,  C08L91/00 ,  C08L2201/56 ,  C09K8/035 ,  C09K8/588 ,  C10G2300/308 ,  C10G2300/80 ,  C08F218/08 ,  C08F220/04

Abstract: 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：US20220186107A1

公开(公告)日：2022-06-16

申请号：US17119688

申请日：2020-12-11

Applicant: Sanyo Chemical Industries, Ltd. ,  Kuraray Co., Ltd.

Inventor： Sou MIYAMOTO ,  Naoya HASHIMOTO ,  Takuma KANESHIMA

IPC: C09K8/60 ,  C09K8/74

Abstract: An object of an embodiment of the present invention is to provide a thickener for a wellbore acid treatment liquid which thickener has excellent hydrolysis resistance and a high thickening capability. A thickener (X) for a wellbore acid treatment liquid contains a surfactant (a) as expressed by General Formula 1 below. In General Formula 1, R1 represents a C12 to C22 alkyl group or a C12 to C22 alkenyl group, R2 and R3 each independently represent a C1 to C3 alkyl group or a C1 to C3 hydroxyalkyl group, X represents a C3 straight-chain hydroxyalkylene group or a C3 branched hydroxyalkylene group, and Y− represents SO3−.

公开(公告)号：US20210269699A1

公开(公告)日：2021-09-02

申请号：US17183407

申请日：2021-02-24

Applicant: KURARAY CO., LTD.

Inventor： Ghebrehiwet GHEBREMESKEL ,  Keisuke MORIKAWA ,  Takuma KANESHIMA

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

Abstract: 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：US20150259457A1

公开(公告)日：2015-09-17

申请号：US14728279

申请日：2015-06-02

Applicant: KURARAY CO., LTD.

Inventor： Takuma KANESHIMA ,  Yusuke AMANO ,  Keisuke MORIKAWA

IPC: C08F265/04 ,  B01J41/14 ,  B01J39/20

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.

Abstract translation: 提供（1）乙烯醇接枝共聚物将可聚合不饱和单体作为接枝链接枝到含侧链巯基的乙烯醇聚合物骨架上，接枝链以巯基连接到聚合物主链上，主链包括 乙烯醇单元和由下式（I）表示的单元：其中R1是氢原子或羧基; R2是氢原子，甲基，羧基或羧甲基; X是含有碳原子和氢原子并且可以含有氮原子和/或氧原子的二价C1-22基团; 和（2）具有在水中具有受控溶胀和优异抗弯曲性的离子交换膜，该膜包括如上所述的乙烯醇接枝共聚物。