公开(公告)号：US11851607B2

公开(公告)日：2023-12-26

申请号：US17187542

申请日：2021-02-26

Applicant: KURARAY CO., LTD.

Inventor： Yasuhiro Tajima

IPC: C08F216/06 ,  C09K8/508

CPC classification number: C09K8/5083 ,  C08F216/06 ,  C08F2800/10 ,  C08F2810/00

Abstract: Provided are a polyvinyl alcohol-based resin having an excellent plugging effect and a plugging agent for underground treatment. A polyvinyl alcohol-based resin is disclosed, in which a degree of swelling (%) when the polyvinyl alcohol-based resin is immersed in water at 40° C. for 30 minutes and a solubility (%) when the polyvinyl alcohol-based resin is immersed in water at 65° C. for 5 hours satisfy the degree of swelling/the solubility≥3.0.

公开(公告)号：US11530144B2

公开(公告)日：2022-12-20

申请号：US16642680

申请日：2018-08-27

Applicant: Kuraray Co., Ltd.

Inventor： Yasuhiro Tajima

IPC: C02F1/50 ,  B63J4/00 ,  C02F1/72 ,  C02F103/00

Abstract: A ballast water treatment method includes: a step of supplying a sterilizing component to a ballast pipe while taking ballast water into a ballast tank through the ballast pipe; a first measurement step of measuring the concentration of the sterilizing component in the ballast water after the sterilizing component is supplied; a circulation step of returning the ballast water stored in the ballast tank to the ballast pipe through a circulation pipe; a second measurement step of measuring the concentration of the sterilizing component contained in the ballast water returned to the ballast pipe; and a step of supplying the sterilizing component to the ballast pipe 2 when the concentration of the sterilizing component measured in the second measurement step is less than 0.2 times the concentration of the sterilizing component measured in the first measurement step. In the first supply step, the sterilizing component is supplied to the ballast pipe 2 such that the concentration of the sterilizing component measured in the first measurement step becomes 6 mg/L or more.

公开(公告)号：US20240040980A1

公开(公告)日：2024-02-08

申请号：US18268574

申请日：2021-12-22

Applicant: Kuraray Co., Ltd.

Inventor： Taeko Kaharu ,  Yoriko Imaoka ,  Yasuhiro Tajima

IPC: A01G31/00 ,  A01G24/30

CPC classification number: A01G31/00 ,  A01G24/30

Abstract: Provided are: a culture fluid for hydroponics accompanied by a large amount of water absorption by plants; an additive for a culture fluid, the additive enabling such a culture fluid to be readily prepared; and a cultivation method in which the same is used. A culture fluid for hydroponics contains water-soluble polymeric molecules, and has a surface tension at 20° C. of 45 mN/m or more and 70 mN/m or less, and a kinematic viscosity at 30° C. of 0.8 mm2/s or more and 2.00 mm2/s or less.

公开(公告)号：US20230340172A1

公开(公告)日：2023-10-26

申请号：US18041253

申请日：2021-08-11

Applicant: KURARAY CO., LTD.

Inventor： Masaki Kato ,  Yuta Taoka ,  Yoriko Imaoka ,  Ayumu Yamamoto ,  Yasuhiro Tajima

IPC: C08F216/06 ,  C08L23/08 ,  C08F2/20 ,  C09K8/24 ,  C09K8/035 ,  C09D129/04 ,  C04B24/26

CPC classification number: C08F216/06 ,  C08L23/0861 ,  C08F2/20 ,  C09K8/24 ,  C09K8/035 ,  C09D129/04 ,  C04B24/2623 ,  C08L2201/14

Abstract: The present invention provides a vinyl alcohol polymer having properties comparable to the properties of vinyl alcohol polymers of solely petroleum origin, and, in using the vinyl alcohol polymer (PVA), saves petroleum resources, and reduces carbon dioxide emissions in production processes. The present invention relates to a vinyl alcohol polymer (X) obtained through saponification after polymerization of a plant-derived vinyl ester monomer (A) and a petroleum-derived vinyl ester monomer (B), and having a mole ratio (A)/(B) of 5/95 to 100/0.

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：US11549046B2

公开(公告)日：2023-01-10

申请号：US17160445

申请日：2021-01-28

Applicant: KURARAY CO., LTD.

Inventor： Ghebrehiwet Ghebremeskel ,  Keisuke Morikawa ,  Yasuhiro Tajima

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

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：US20230026382A1

公开(公告)日：2023-01-26

申请号：US17787271

申请日：2020-12-16

Applicant: KURARAY CO., LTD.

Inventor： Yasuhiro Tajima

IPC: C02F1/50

Abstract: The present invention relates to a ballast water treatment pack comprising: a chlorine-based sterilizing agent; and a wrapper formed of a water-soluble film or a water-soluble fiber entangled body for wrapping the chlorine-based sterilizing agent.