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).
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Publication number: 20210238467Abstract: 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: ApplicationFiled: January 28, 2021Publication date: August 5, 2021Inventors: Ghebrehiwet Ghebremeskel, Keisuke Morikawa, Yasuhiro Tajima
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Patent number: 11001703Abstract: The present invention provides an aqueous emulsion excellent in heat resistance, water resistance (particularly, hot water resistance and boiling resistance), and viscosity stability. The present invention also provides an adhesive containing the aqueous emulsion, forming an adhesive layer resistant to staining, and ensuring a high level of safety. The present invention relates to an aqueous emulsion containing an ethylenically unsaturated monomer unit-containing polymer (A) as a dispersoid and vinyl alcohol polymer (B) as a dispersant, wherein, the ethylenically unsaturated monomer unit-containing polymer (A) includes a structural unit derived from a radical-polymerizable ethylenically unsaturated monomer (a) having a functional group represented by the following general formula (W), and the degree of saponification of the vinyl alcohol polymer (B) is 80 mol % or more: wherein, X is an oxygen atom or sulfur atom, and * represents a bond.Type: GrantFiled: December 20, 2016Date of Patent: May 11, 2021Assignee: KURARAY CO., LTD.Inventors: Tatsuya Tanida, Keisuke Morikawa
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Publication number: 20210108111Abstract: There is provided an ethylene-vinyl alcohol copolymer with 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 99.7 mol %, wherein a block character of ethylene units in the ethylene-vinyl alcohol copolymer is 0.90 to 0.99. Such an ethylene-vinyl alcohol copolymer has excellent high-speed coating ability and water-resistant adhesiveness, particularly when being used as an adhesive.Type: ApplicationFiled: April 16, 2019Publication date: April 15, 2021Applicant: KURARAY CO., LTD.Inventors: Tatsuya TANIDA, Keisuke MORIKAWA, Masako KATAYAMA
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Publication number: 20210009842Abstract: 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.Type: ApplicationFiled: March 25, 2019Publication date: January 14, 2021Applicant: KURARAY CO., LTD.Inventors: Keisuke MORIKAWA, Tatsuya TANIDA, Yuta TAOKA
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Publication number: 20200396990Abstract: 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: ApplicationFiled: March 7, 2019Publication date: December 24, 2020Applicant: KURARAY CO., LTD.Inventors: Taeko KAHARU, Keisuke MORIKAWA
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Publication number: 20200392364Abstract: 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: ApplicationFiled: December 11, 2018Publication date: December 17, 2020Applicant: KURARAY CO., LTDInventors: Keisuke MORIKAWA, Tatsuya TANIDA
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Patent number: 10844212Abstract: The present invention provides an aqueous emulsion composition excellent in heat resistance, water resistance, hot water resistance, boiling water resistance, and viscosity stability and also excellent in stain resistance. The present invention relates to an aqueous emulsion composition including an aqueous emulsion (D) and a cyclic acid anhydride (E). The aqueous emulsion (D) includes a polymer (X) having an ethylenically unsaturated monomer (B), a polyvinyl alcohol resin (A), and water. At least one selected from the polyvinyl alcohol resin (A) and the polymer (X) has, in a main chain thereof, a structural unit derived from a monomer (C) represented by the following formula (I), (II), (III), or (IV). (The definitions of the symbols in the formulae are omitted.Type: GrantFiled: June 24, 2016Date of Patent: November 24, 2020Assignee: KURARAY CO., LTD.Inventors: Tatsuya Tanida, Keisuke Morikawa
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Patent number: 10829661Abstract: The present invention provides an aquatic organism repellent paint composition having good dispersion stability and capable of maintaining the repellent effect on aquatic organisms over a long time. The present invention relates to an aquatic organism repellent paint composition containing: a vinyl alcohol polymer (A) having a degree of saponification of more than 65 mol % and less than 88 mol %; an inorganic oxide (B); and a solvent (C).Type: GrantFiled: July 5, 2017Date of Patent: November 10, 2020Assignees: KURARAY CO., LTD., FUJI SILYSIA CHEMICAL LTD.Inventors: Tadahito Fukuhara, Keisuke Morikawa, Mitsuteru Ogawa, Mutsuhiro Ito, Yoshio Nakano, Akio Kameyama
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Publication number: 20200299435Abstract: 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: ApplicationFiled: October 16, 2018Publication date: September 24, 2020Applicant: KURARAY CO., LTDInventors: Tatsuya TANIDA, Keisuke MORIKAWA, Masato NAKAMAE, Seisuke INADA
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Publication number: 20200291217Abstract: The present invention provides an aqueous emulsion excellent in heat resistance, water resistance (particularly, hot water resistance and boiling resistance), and viscosity stability. The present invention also provides an adhesive containing the aqueous emulsion, forming an adhesive layer resistant to staining, and ensuring a high level of safety. The present invention relates to an aqueous emulsion containing an ethylenically unsaturated monomer unit-containing polymer (A) as a dispersoid and vinyl alcohol polymer (B) as a dispersant, wherein, the ethylenically unsaturated monomer unit-containing polymer (A) includes a structural unit derived from a radical-polymerizable ethylenically unsaturated monomer (a) having a functional group represented by the following general formula (W), and the degree of saponification of the vinyl alcohol polymer (B) is 80 mol % or more: wherein, X is an oxygen atom or sulfur atom, and * represents a bond.Type: ApplicationFiled: December 20, 2016Publication date: September 17, 2020Applicant: KURARAY CO., LTD.Inventors: Tatsuya TANIDA, Keisuke MORIKAWA
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Patent number: 10759910Abstract: A method for manufacturing an organism adhesion reduction paint includes a first process of gelling a raw material composition that includes polyvinyl alcohol and at least one of a hydroxyl group-containing inorganic compound or an inorganic oxide; a second process of drying and subsequently pulverizing a resulting product in the first process to thereby obtain a composite gel fine powder; and a third process of adding the composite gel fine powder to a main component of a two-component urethane paint and stirring, to thereby prepare a main component of the organism adhesion reduction paint, and also adding a curing agent immediately before use.Type: GrantFiled: July 11, 2016Date of Patent: September 1, 2020Assignees: FUJI SILYSIA CHEMICAL LTD., DAISYO GREEN INDUSTRY CO., LTD., KURARAY CO., LTD.Inventors: Mitsuteru Ogawa, Shinji Yamamoto, Kiyoshi Kuroda, Mutsuhiro Ito, Yoshio Nakano, Akio Kameyama, Tadahito Fukuhara, Keisuke Morikawa
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Publication number: 20200214284Abstract: 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: ApplicationFiled: August 24, 2018Publication date: July 9, 2020Applicant: KURARAY CO., LTD.Inventors: Keisuke MORIKAWA, Taeko KAHARU
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Publication number: 20200157390Abstract: The present invention provides an aqueous emulsion that excels in heat resistance, water resistance (particularly, hot water resistance and boiling resistance), and viscosity stability. The present invention relates to an aqueous emulsion comprising an ethylenically unsaturated monomer unit-containing polymer (A) as a dispersoid and a vinyl alcohol polymer (B) as a dispersant, wherein the ethylenically unsaturated monomer unit-containing polymer (A) comprises: a structural unit derived from a radical-polymerizable ethylenically unsaturated monomer (p) having a functional group represented by the following general formula (P); and a structural unit derived from a radical-polymerizable ethylenically unsaturated monomer (q) having a functional group represented by the following general formula (Q), wherein X and Y are the same or different, and each represent an oxygen atom or a sulfur atom, Z is an oxygen atom or a nitrogen atom, * represents a bond, and m is 1 or 2.Type: ApplicationFiled: June 21, 2018Publication date: May 21, 2020Applicant: KURARAY CO., LTD.Inventors: Yoriko IMAOKA, Keisuke MORIKAWA, Tatsuya TANIDA
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Patent number: 10626203Abstract: The present invention relates generally to a polyvinyl alcohol composition having higher amorphous polyvinyl alcohol polymer content and various end uses thereof.Type: GrantFiled: September 24, 2018Date of Patent: April 21, 2020Assignee: KURARAY CO., LTD.Inventors: Michael Collins, Ghebrehiwet Ghebremeskel, Masaki Kato, Keisuke Morikawa, Yoriko Imaoka
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Publication number: 20200087860Abstract: 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: ApplicationFiled: March 29, 2018Publication date: March 19, 2020Applicant: KURARAYCQ., LTD.Inventors: Keisuke MORIKAWA, Taeko KAHARU, Tadahito FUKUHARA, Yuki TACHIBANA
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Publication number: 20200071592Abstract: 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: ApplicationFiled: August 28, 2019Publication date: March 5, 2020Applicant: KURARAY CO., LTD.Inventors: Ghebrehiwet Ghebremeskel, Keisuke Morikawa, Richard Cazares
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Publication number: 20200071599Abstract: 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: ApplicationFiled: August 28, 2019Publication date: March 5, 2020Applicant: KURARAY CO., LTD.Inventors: Ghebrehiwet GHEBREMESKEL, Masaki KATO, Keisuke MORIKAWA, Erik BATEHAM
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Publication number: 20200032458Abstract: 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: ApplicationFiled: March 29, 2018Publication date: January 30, 2020Applicant: KURARAY CO., LTD.Inventors: Keisuke MORIKAWA, Taeko KAHARU
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Publication number: 20190338115Abstract: 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: ApplicationFiled: December 27, 2017Publication date: November 7, 2019Applicant: KURARAY CO., LTD.Inventors: Tadahito FUKUHARA, Keisuke MORIKAWA, Taeko KAHARU
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Publication number: 20190249028Abstract: The present invention provides an aquatic organism repellent paint composition having good dispersion stability and capable of maintaining the repellent effect on aquatic organisms over a long time. The present invention relates to an aquatic organism repellent paint composition containing: a vinyl alcohol polymer (A) having a degree of saponification of more than 65 mol % and less than 88 mol %; an inorganic oxide (B); and a solvent (C).Type: ApplicationFiled: July 5, 2017Publication date: August 15, 2019Applicants: KURARAY CO., LTD., FUJI SILYSIA CHEMICAL LTD.Inventors: Tadahito FUKUHARA, Keisuke MORIKAWA, Mitsuteru OGAWA, Mutsuhiro ITO, Yoshio NAKANO, Akio KAMEYAMA