Patents Assigned to Kuraray Co., Ltd.
  • Publication number: 20220371893
    Abstract: An object of the present invention is to provide a carbonaceous material suitable as an electrode material of an electrochemical device which is increased in capacity with not only suppression of an increase in irreversible capacity, but also securement of a high electrode density, as well as a method for producing the carbonaceous material The present invention relates to a carbonaceous material for an electrochemical device, having a specific surface area of 23 m2/g or less as measured according to a BET method and an aerated energy (AE) of 40 mJ or more and 210 mJ or less as measured with a powder rheometer.
    Type: Application
    Filed: October 6, 2020
    Publication date: November 24, 2022
    Applicant: KURARAY CO., LTD.
    Inventors: Junichi ARIMA, Yasuyuki HIROTA, Akinori YAMABATA, Taketoshi OKUNO
  • Publication number: 20220372187
    Abstract: The present invention relates to a resin composition comprising an ethylene-vinyl alcohol copolymer (A) with an ethylene unit content of 20 mol % or more and 60 mol % or less, a divalent metal hydroxide (B) and a monovalent metal compound (C), wherein a content of the divalent metal hydroxide (B) is 5 ppm or more and 5000 ppm or less, and a mass ratio (C/B) of the amount of the monovalent metal compound (C) in terms of the monovalent metal atom to the amount of the divalent metal hydroxide (B) in terms of the divalent metal atom is 0.025 to 100. Thus, there is provided a resin composition containing an ethylene-vinyl alcohol copolymer having excellent long run property during melt molding and excellent color phase in long-term melt molding.
    Type: Application
    Filed: December 25, 2020
    Publication date: November 24, 2022
    Applicant: KURARAY CO., LTD.
    Inventors: Rina Hoshika, Yuji Shimizu
  • Publication number: 20220363883
    Abstract: A vinyl chloride resin composition includes a vinyl chloride resin (A), an acrylic block copolymer (B) including a polymer block (b1) containing acrylic acid ester units and a polymer block (b2) containing methacrylic acid ester units, and a gelation accelerator (C), where the weight average molecular weight of the acrylic block copolymer (B) is in the range of 100,000 to 250,000, the content of the polymer block (b2) in the acrylic block copolymer (B) is in the range of 10 to 25 mass %, and the vinyl chloride resin composition contains 20 to 150 parts by mass of the acrylic block copolymer (B) and 4 to 18 parts by mass of the gelation accelerator (C) with respect to 100 parts by mass of the vinyl chloride resin (A).
    Type: Application
    Filed: December 21, 2020
    Publication date: November 17, 2022
    Applicant: KURARAY CO., LTD.
    Inventors: Moe KAWAHARA, Makoto AKAI, Tomohiro ONO
  • Publication number: 20220363810
    Abstract: Provided is an amorphous epoxy fiber excellent in dimensional stability, a fiber structure comprising at least in part amorphous epoxy fibers, and a molded body formed by melting said fibers. The amorphous epoxy fiber has a birefringence value of 0.005 or lower. For example, the amorphous epoxy fiber may include an amorphous epoxy resin represented by the following general formula: in which, X is a residue of a bivalent phenol and n is 20 or greater (preferably 20 to 300, more preferably 40 to 280, still more preferably 50 to 250). The amorphous epoxy fiber may have an average fiber diameter of single fibers of 40 ?m or smaller.
    Type: Application
    Filed: July 22, 2022
    Publication date: November 17, 2022
    Applicant: KURARAY CO., LTD.
    Inventors: Yuki INOUE, Takeshi TSUDAKA, Ryokei ENDO
  • Patent number: 11499266
    Abstract: Disclosed is a grain-finished artificial leather including an artificial leather base material, and a grain layer stacked on the artificial leather base material. The artificial leather base material includes a fiber-entangled body including ultrafine fibers having an average fineness of 0.4 dtex or less, an elastic polymer, and fine particles having an average particle size of 10 ?m or less. The content ratio of the fine particles is 10 to 40 mass %, and the ratio of the elastic polymer to the total amount of the elastic polymer and the fine particles is 20 to 80 mass %. Also, a total of an apparent density of the elastic polymer and an apparent density of the fine particles is 0.23 to 0.55 g/cm3.
    Type: Grant
    Filed: May 21, 2018
    Date of Patent: November 15, 2022
    Assignee: KURARAY CO., LTD.
    Inventors: Kimio Nakayama, Hayaki Sato, Naoto Narumoto, Akihisa Iwamoto
  • Publication number: 20220354072
    Abstract: A water-absorbent copolymer may include a vinyl alcohol constituent unit x and a constituent unit z other than the vinyl alcohol constituent unit x and a vinyl ester constituent unit y, wherein a ratio of a content of an average sequence of the constituent unit z to a content of the constituent unit z is 50.0 mol % or less.
    Type: Application
    Filed: June 23, 2020
    Publication date: November 10, 2022
    Applicant: KURARAY CO., LTD.
    Inventors: Masahiro BABA, Yusuke SAEGUSA, Toshinori KATO
  • Patent number: 11492438
    Abstract: A block copolymer including a polymer block (A) containing more than 70 mol % of a unit derived from an aromatic vinyl compound, and a polymer block (B) containing 30 mol % or more of a unit derived from a conjugated diene compound is provided. The block copolymer satisfies the conditions: (1): a content of the polymer block (A) in the block copolymer is 1 to 70% by mass; (2): a maximum width of a series of temperature regions where tan ? measured in accordance with JIS K7244-10 (2005), under conditions including a strain amount of 0.1%, a frequency of 1 a measurement temperature of ?70 to 100° C., and a temperature rise rate of 3° C./min, is 1.0 or more is less than 16° C.; (3): a temperature at a peak position of tan ? in the condition (2) is 0° C. to +50° C.; and (4): a mobility parameter M indicating a mobility of the polymer block (B) is 0.01 to 0.25 sec.
    Type: Grant
    Filed: May 30, 2019
    Date of Patent: November 8, 2022
    Assignee: KURARAY CO., LTD.
    Inventors: Yasushi Senda, Masahiro Kato, Mikio Masuda
  • Patent number: 11492260
    Abstract: A problem to be solved by the present invention is to provide a carbonaceous material suitable for a negative electrode active material for non-aqueous electrolyte secondary batteries (e.g., lithium ion secondary batteries, sodium ion secondary batteries, lithium sulfur batteries, lithium air batteries) having high charge/discharge capacities and preferably high charge/discharge efficiency as well as low resistance, a negative electrode comprising the carbonaceous material, a non-aqueous electrolyte secondary battery comprising the negative electrode, and a production method of the carbonaceous material. The present invention relates to a carbonaceous material having a nitrogen element content of 1.0 mass % or more and an oxygen content of 1.5 mass % or less obtained by elemental analysis, a ratio of nitrogen element content and hydrogen element content (RN/H) of 6 or more and 100 or less, a ratio of oxygen element content and nitrogen element content (RO/N) of 0.1 or more and 1.
    Type: Grant
    Filed: July 4, 2018
    Date of Patent: November 8, 2022
    Assignee: KURARAY CO., LTD.
    Inventors: Takafumi Izawa, Kengo Tachikawa, Hideharu Iwasaki
  • Publication number: 20220348757
    Abstract: A method for discriminating a polyvinyl alcohol resin film containing a polyvinyl alcohol resin in which all or a part of carbon is derived from bio-derived ethylene from a polyvinyl alcohol resin film containing only a polyvinyl alcohol resin derived only from fossil fuel-derived ethylene by measuring an abundance ratio 14C/C of carbon 14 (14C) in total carbon.
    Type: Application
    Filed: July 20, 2022
    Publication date: November 3, 2022
    Applicant: KURARAY CO., LTD.
    Inventors: Osamu KAZETO, Yasutaka INUBUSHI
  • Patent number: 11485811
    Abstract: The invention relates to particles with an average particle size of 300 to 1000 ?m, comprising a modified polyvinyl alcohol having vinyl alcohol units and structural units represented by formula (1), wherein a content of the vinyl alcohol units is 60 to 90 mol % based on the total structural units: wherein R1 represents a hydrogen atom or a methyl group. Thus, the present invention provides particles containing a modified polyvinyl alcohol having high water solubility and high affinity for a photosensitive monomer, which are highly photosensitive.
    Type: Grant
    Filed: February 18, 2019
    Date of Patent: November 1, 2022
    Assignee: KURARAY CO., LTD.
    Inventors: Yusuke Amano, Yuki Tachibana, Yuki Shimizu, Kazuhiko Maekawa
  • Patent number: 11485847
    Abstract: The present invention provides a methacrylic resin composition comprising 75 to 99.8 mass % of a methacrylic resin [A], 0.1 to 15 mass % of a UV absorber [B], and 0.1 to 10 mass % of a polymer [C] having an SP value of 6.0 to 9.7 (cal/cm3)1/2 calculated by the Fedors method.
    Type: Grant
    Filed: December 20, 2018
    Date of Patent: November 1, 2022
    Assignee: KURARAY CO., LTD.
    Inventors: Shigeru Sakamoto, Takuro Niimura, Taketomo Yamashita, Atsuhiro Nakahara
  • Publication number: 20220333299
    Abstract: A napped artificial leather includes: a non-woven fabric that is art entangled body of ultrafine fibers, and an elastic polymer applied into the non-woven fabric; where the napped artificial leather has, on at least one side thereof, a napped surface formed by napping the ultrafine fibers. Each of the ultrafine fibers is art ultrafine fiber having a fineness of 0.5 dtex or less, and a tensile strength of 6 to 9 mN. A plurality of the ultrafine fibers form a fiber bundle, and the ultrafine fibers that form the fiber bundle are not constrained by the elastic polymer in a region of the napped artificial leather other than a surface layer portion. A content ratio of the elastic polymer is 16 to 40 mass %, and the napped artificial leather has an apparent density of 0.38 g/cm3 or more.
    Type: Application
    Filed: September 3, 2020
    Publication date: October 20, 2022
    Applicant: KURARAY CO., LTD.
    Inventors: Akihisa Iwamoto, Masashi Meguro, Hiroyuki Hishida, Kiyofumi Enomoto
  • 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: 11473218
    Abstract: A modified ethylene-vinyl alcohol copolymer fiber includes an ethylene-vinyl alcohol copolymer containing 0.1 to 10 mol % of a modified component and 5 to 55 mol % of ethylene, and has a crystallinity of 25% to 50%.
    Type: Grant
    Filed: December 20, 2018
    Date of Patent: October 18, 2022
    Assignee: KURARAY CO., LTD.
    Inventors: Shoji Onogi, Hitoshi Nakatsuka, Shinya Kawakado, Takayuki Ikeda
  • Publication number: 20220325025
    Abstract: To provide a curable composition that is readily modeled with low viscosity and excellent curing capability in modeling by stereolithography, and provides a cured article excellent in toughness and water resistance, and a resin composition for stereolithography prepared therefrom. To provide a resin composition for stereolithography that is favorable particularly for a dental mouthpiece and a denture base material. A curable composition containing 79.0 to 99.0% by mass of a polymerizable monomer (a), 0.1 to 10.0% by mass of a photopolymerization initiator (b), and 0.01 to 20.
    Type: Application
    Filed: June 25, 2020
    Publication date: October 13, 2022
    Applicant: KURARAY CO., LTD.
    Inventors: Daiki NOGUCHI, Takashi FUKUMOTO, Kenji SUZUKI
  • Publication number: 20220325452
    Abstract: A braid including a core part and a sheath part, wherein the core part includes a high strength fiber (a) having a fineness of 300 to 4,000 dtex and a tensile strength of 12 cN/dtex or more, and the sheath part includes a colored synthetic fiber (b) having a fineness of 60 to 1,000 dtex and a tensile strength of less than 12 cN/dtex. A volume ratio [av/bv] of the high strength fiber (a) constituting the core part to the colored synthetic fiber (b) constituting the sheath part is from 73/27 to 40/60. The sheath part has a braid-like structure.
    Type: Application
    Filed: May 31, 2022
    Publication date: October 13, 2022
    Applicant: KURARAY CO., LTD.
    Inventors: Kazumasa KUSUDO, Toshiaki KOBAYASHI
  • Publication number: 20220325094
    Abstract: A resin composition including a component (x) that is a hydrogenate (X) of a block copolymer having a polymer block (A-1) containing a structural unit derived from an aromatic vinyl compound and a polymer block (B-1) containing a structural unit derived from a conjugated diene compound; and a component (y) that is a block copolymer (Y0) having a polymer block (A-2) containing a structural unit derived from an aromatic vinyl compound and a polymer block (B-2) containing a structural unit derived from a conjugated diene compound, or a hydrogenate (Y) thereof, wherein the resin composition satisfies the following requirements [1] to [3]; [1] a glass transition temperature of the component (x) is ?10° C. or higher; [2] a glass transition temperature of the component (y) is lower than ?10° C.; and [3] a ratio Mx/My of a mass Mx of the component (x) to a mass My of the component (y) in the resin composition is 1/99 to 99/1.
    Type: Application
    Filed: September 14, 2021
    Publication date: October 13, 2022
    Applicant: KURARAY CO., LTD.
    Inventor: Yasushi SENDA
  • Publication number: 20220307161
    Abstract: Provided is a sea-island composite fiber having excellent spinnability and thermoplastic deformability. The sea-island composite fiber comprises an island component and a sea component having a lower melting point than that of the island component, wherein the fiber has an aspect ratio of from 2.0 to 5.0 in a fiber cross section; and the sea component has a sea component thickness of from 0.2 to 2.0 ?m, the sea component thickness being defined as a distance between an outer periphery of the fiber and an island component closest to the outer periphery on a minor axis of the fiber cross section.
    Type: Application
    Filed: June 15, 2022
    Publication date: September 29, 2022
    Applicant: KURARAY CO., LTD.
    Inventors: Kaori IMAGAWA, Satoshi KOIZUMI
  • Publication number: 20220306822
    Abstract: To provide surface-modified fibers and reinforcing fibers that are capable of enhancing the adhesiveness to rubber, without the use of resorcinol and formaldehyde, and a molded article using the same. Surface-modified fibers include fibers, and a surface-modifying layer covering at least a part of a surface of the fibers, and have a solid surface zeta potential on a surface of the surface-modifying layer of ?20.0 to 30.0 mV.
    Type: Application
    Filed: November 10, 2020
    Publication date: September 29, 2022
    Applicant: KURARAY CO., LTD.
    Inventors: Eiichi ISHIDA, Daisuke KODA, Toru ASADA, Shinichi TAKEMOTO, Shuhei YORIMITSU, Hiroyuki KAWAI
  • Publication number: 20220307629
    Abstract: Disclosed are a structure of a composite flexible pipeline for crude oil and natural gas transportation, a laying method therefor, and a transportation method for crude oil or natural gas. The transportation method is a method for transporting crude oil or natural gas through a pipeline comprising a multilayer structure having at least one barrier resin layer. The barrier resin layer comprises an ethylene-vinyl alcohol copolymer resin as a main component. A pipeline for the transportation method, and a laying method for the pipeline. Through a pipeline which does not have corrosion concern and has excellent acid resistance and acid gas barrier properties, a method for safely transporting crude oil or natural gas is provided without leak of hydrogen sulfide gas, carbon dioxide, and hydrocarbon gas to the external environment.
    Type: Application
    Filed: May 12, 2020
    Publication date: September 29, 2022
    Applicant: KURARAY CO., LTD.
    Inventors: Yuan Song, Takeshi Sakano, Weimin Gao