Patents by Inventor Keisuke Morikawa

Keisuke Morikawa has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 11944093
    Abstract: The present invention provides a spreading agent for agrochemicals having superior adhesion particularly for plant surface. The present invention also provides an agrochemical spray solution having a reduced risk of leaving the spreading agent for agrochemicals on a plant surface. The present invention relates to a spreading agent for agrochemicals comprising a carboxy-modified vinyl alcohol polymer (A) having a carboxy-containing monomer unit content of 0.1 mol % to 10 mol %, a viscosity-average degree of polymerization of 200 to 5,000, and a degree of saponification of 65 mol % to 99.9 mol %.
    Type: Grant
    Filed: March 7, 2019
    Date of Patent: April 2, 2024
    Assignee: KURARAY CO., LTD.
    Inventors: Taeko Kaharu, Keisuke Morikawa
  • Patent number: 11787928
    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.
    Type: Grant
    Filed: January 27, 2021
    Date of Patent: October 17, 2023
    Assignee: KURARAY CO., LTD.
    Inventors: Ghebrehiwet Ghebremeskel, Keisuke Morikawa, Richard Cazares, Masaki Kato
  • Patent number: 11767462
    Abstract: 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.
    Type: Grant
    Filed: May 21, 2021
    Date of Patent: September 26, 2023
    Assignee: Kuraray Co., Ltd.
    Inventors: Ghebrehiwet Ghebremeskel, Takuma Kaneshima, Keisuke Morikawa, Amanda Reneau
  • Publication number: 20230212339
    Abstract: 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.
    Type: Application
    Filed: May 24, 2021
    Publication date: July 6, 2023
    Applicant: KURARAY CO., LTD.
    Inventors: Ghebrehiwet Ghebremeskel, Keisuke Morikawa, Takuma Kaneshima
  • Patent number: 11643781
    Abstract: Release paper base paper includes a substrate; and a coating agent containing a modified polyvinyl alcohol (A) and sodium acetate, the substrate coated with the coating agent, wherein the modified polyvinyl alcohol (A) has 0.005 mol % or more and less than 10 mol % of double bonds derived from unsaturated carboxylic acid or a derivative thereof (B) in side chains, has 1.4 mol % or more and 2.0 mol % or less of 1,2-glycol bond, units, and is water soluble, and a content of the sodium acetate relative to the modified polyvinyl alcohol (A) is 0.01 mass % or more and 10 mass % or less. The release paper base paper of the present invention is excellent in sealing properties for silicone. Use of the release paper base paper allows acceleration of curing of silicone in a release layer and improvement in adhesion between the substrate and the release layer.
    Type: Grant
    Filed: March 29, 2018
    Date of Patent: May 9, 2023
    Assignee: KURARAY CO., LTD.
    Inventors: Keisuke Morikawa, Taeko Kaharu, Tadahito Fukuhara, Yuki Tachibana
  • Patent number: 11641853
    Abstract: The present invention provides a spreading agent for agrochemicals having excellent spreadability particularly against surfaces of plant leaves. The present invention also provides an agrochemical spray solution comprising the spreading agent for agrochemicals, and that shows excellent storage stability (particularly viscosity stability) even during long storage. The present invention relates to a spreading agent for agrochemicals that comprises an ethylene-modified vinyl alcohol polymer (A) having an ethylene unit content of 1.0 mol % to 19 mol %, a 1,2-glycol linkage unit content of 1.2 mol % to 2.0 mol %, a viscosity-average degree of polymerization of 200 to 5,000, and a degree of saponification of 80 mol % to 99.9 mol %.
    Type: Grant
    Filed: August 24, 2018
    Date of Patent: May 9, 2023
    Assignee: KURARAY CO., LTD.
    Inventors: Keisuke Morikawa, Taeko Kaharu
  • Patent number: 11549046
    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.
    Type: Grant
    Filed: January 28, 2021
    Date of Patent: January 10, 2023
    Assignee: KURARAY CO., LTD.
    Inventors: Ghebrehiwet Ghebremeskel, Keisuke Morikawa, Yasuhiro Tajima
  • Patent number: 11518902
    Abstract: The present invention relates to ethylene-vinyl alcohol copolymer particles, comprising an ethylene-vinyl alcohol copolymer having an ethylene unit content of 1 mol % or more and less than 20 mol %, a viscosity-average polymerization degree of 200 to 5000, and a saponification degree of 80 to 99.99 mol %, wherein a crystallinity in water Cw (30° C.) at 30° C. and a crystallinity in water Cw (70° C.) at 70° C. as determined by pulse NMR satisfy formula (I). There is thus provided ethylene-vinyl alcohol copolymer particles having excellent solubility in water and excellent gas barrier performance.
    Type: Grant
    Filed: October 16, 2018
    Date of Patent: December 6, 2022
    Assignee: KURARAY CO., LTD.
    Inventors: Tatsuya Tanida, Keisuke Morikawa, Masato Nakamae, Seisuke Inada
  • Publication number: 20220331849
    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.
    Type: Application
    Filed: April 11, 2022
    Publication date: October 20, 2022
    Applicant: KURARAY CO., LTD.
    Inventors: Keisuke Morikawa, Pablo Garcia, Levi Neufeld
  • Patent number: 11414563
    Abstract: The present invention provides an aqueous solution containing an ethylene-vinyl alcohol copolymer (A), an alcohol (B) having 1 to 4 carbon atoms and water (C), wherein an ethylene unit content of the ethylene-vinyl alcohol copolymer (A) is 1 mol % or more and less than 20 mol %; a crystallinity in water Cw (30° C.) at 30° C. and a crystallinity in water Cw (70° C.) at 70° C. as determined by pulse NMR satisfy Formula (I); the ethylene-vinyl alcohol copolymer (A) is contained in 0.1 to 100 parts by mass based on 100 parts by mass of water (C); and the alcohol (B) is contained in 0.01 to 30 parts by mass based on 100 parts by mass of water (C). Thus, there is provided an aqueous solution of an ethylene-vinyl alcohol copolymer, which forms a less number of lumps and generates a reduced amount of fibrillar precipitate even when a shear stress is applied. 4 ? 100 - Cw ? ( 30 ? ° ? ? C . ) 100 × [ Cw ? ( 30 ? ° ? ? C . ) - Cw ? ( 70 ? ° ? ? C .
    Type: Grant
    Filed: December 11, 2018
    Date of Patent: August 16, 2022
    Assignee: KURARAY CO., LTD.
    Inventors: Keisuke Morikawa, Tatsuya Tanida
  • Patent number: 11384276
    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.
    Type: Grant
    Filed: February 24, 2021
    Date of Patent: July 12, 2022
    Assignee: KURARAY CO., LTD.
    Inventors: Ghebrehiwet Ghebremeskel, Keisuke Morikawa, Takuma Kaneshima
  • Publication number: 20220177733
    Abstract: An aqueous emulsion may include an ethylene-vinyl alcohol copolymer (A) as a dispersant and a polymer (B) which contains an ethylenically unsaturated monomer unit as a dispersoid, wherein the ethylene-vinyl alcohol copolymer (A) has an ethylene unit content of 1 mol % or more and less than 20 mol %; and a crystallinity in water at 30° C. (Cw (30° C.)) and a crystallinity in water at 70° C. (Cw (70° C.)) as determined by pulse NMR satisfying formula (I). Such aqueous emulsions can form fewer aggregates and exhibit excellent water-resistant adhesiveness and excellent film formability.
    Type: Application
    Filed: April 2, 2020
    Publication date: June 9, 2022
    Applicant: KURARAY CO., LTD.
    Inventors: Yoriko IMAOKA, Keisuke MORIKAWA, Tatsuya TANIDA
  • Patent number: 11352751
    Abstract: Release paper base paper, includes: a substrate; and a coating agent containing a polyvinyl alcohol (A) and a compound (B), the substrate coated with the coating agent, wherein the compound (B) is unsaturated carboxylic acid or a derivative thereof having a pKa of less than 4.00, and 0.1 part by mass or more and 20 parts by mass or less of the compound (B) is contained based on 100 parts by mass of the polyvinyl alcohol (A). The release paper base paper of the present invention is excellent in sealing properties for silicone and waterproofness. The release paper base paper of the present invention is also capable of accelerating curing of silicone in a release layer.
    Type: Grant
    Filed: March 29, 2018
    Date of Patent: June 7, 2022
    Assignee: KURARAY CO., LTD.
    Inventors: Keisuke Morikawa, Taeko Kaharu
  • Publication number: 20220056330
    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.
    Type: Application
    Filed: August 19, 2021
    Publication date: February 24, 2022
    Applicant: Kuraray Co., Ltd.
    Inventors: Ghebrehiwet Ghebremeskel, Keisuke Morikawa, Takuma Kaneshima
  • Patent number: 11236260
    Abstract: A biodegradable and substantially water-soluble thermoplastic polyvinyl alcohol-based diverting agent is provided which comprises pellets of a specified polyvinyl alcohol optionally with certain specified additives, which pellets are made in an extruder and cut to a specified size.
    Type: Grant
    Filed: August 28, 2019
    Date of Patent: February 1, 2022
    Assignee: KURARAY CO., LTD.
    Inventors: Ghebrehiwet Ghebremeskel, Keisuke Morikawa, Richard Cazares
  • Patent number: 11208550
    Abstract: There is provided a composition (C) comprising a modified PVA (A) and a compound (B), wherein the modified PVA (A) contains 0.01 mol % or more and less than 2 mol % of double bonds derived from an unsaturated carboxylic acid or a derivative thereof in side chains; the compound (B) is a compound having a conjugated double bond and two or more hydroxy groups bonded to the conjugated double bond, or a salt or oxide thereof; and a content of the compound (B) in the composition (C) is 0.001 parts by mass or more and less than 5 parts by mass based on 100 parts by mass of the modified PVA (A). The composition (C) has excellent hue, contains less insolubles in water, and has excellent water solubility.
    Type: Grant
    Filed: December 27, 2017
    Date of Patent: December 28, 2021
    Assignee: Kuraray Co., Ltd.
    Inventors: Tadahito Fukuhara, Keisuke Morikawa, Taeko Kaharu
  • Publication number: 20210380864
    Abstract: 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.
    Type: Application
    Filed: May 21, 2021
    Publication date: December 9, 2021
    Applicant: Kuraray Co., Ltd.
    Inventors: Ghebrehiwet Ghebremeskel, Takuma Kaneshima, Keisuke Morikawa, Amanda Reneau
  • Publication number: 20210269699
    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.
    Type: Application
    Filed: February 24, 2021
    Publication date: September 2, 2021
    Applicant: KURARAY CO., LTD.
    Inventors: Ghebrehiwet GHEBREMESKEL, Keisuke MORIKAWA, Takuma KANESHIMA
  • Patent number: 11098236
    Abstract: Provided are low dust-content particulate polyvinyl alcohol-based compositions suitable for a variety of end uses including for use in subterranean treatments and for manufacturing chemical materials, which are prepared by compacting a specified polyvinyl alcohol polymer resins, optionally with specified additives and/or other polyvinyl alcohols.
    Type: Grant
    Filed: August 28, 2019
    Date of Patent: August 24, 2021
    Assignee: KURARAY CO., LTD.
    Inventors: Ghebrehiwet Ghebremeskel, Masaki Kato, Keisuke Morikawa, Erik Bateham
  • Publication number: 20210238401
    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.
    Type: Application
    Filed: January 27, 2021
    Publication date: August 5, 2021
    Applicant: KURARAY CO., LTD.
    Inventors: Ghebrehiwet GHEBREMESKEL, Keisuke MORIKAWA, Richard CAZARES, Masaki KATO