Patents Assigned to Kuraray Co., Ltd.
  • Publication number: 20230122106
    Abstract: One aspect of the present invention relates to a carbonaceous material having a BET specific surface area calculated from a nitrogen adsorption isotherm by a BET method, of 750 m2/g or more and 1000 m2/g or less, a ratio of a pore volume of pores of 0.3875 to 0.9125 nm calculated from the nitrogen adsorption isotherm by a HK method to a total pore volume calculated from the nitrogen adsorption isotherm by the HK method, of 80% or more, and an average pore diameter obtained by the following formula using the BET specific surface area and the total pore volume calculated from the nitrogen adsorption isotherm by the HK method, of 1.614 nm or less: D=4000×V/S (wherein D represents the average pore diameter (nm), V represents the total pore volume (mL/g), and S represents the specific surface area (m2/g)).
    Type: Application
    Filed: June 25, 2021
    Publication date: April 20, 2023
    Applicant: KURARAY CO., LTD.
    Inventors: Tetsuya HANAMOTO, Mitsunori HITOMI, Hiroe YOSHINOBU
  • Publication number: 20230118744
    Abstract: The present invention provides an aqueous dispersion that enables production of a film having improved water resistance, tensile elastic modulus, and stress at break, and with which a decrease of strain at break can be reduced in the film. The present invention relates to an aqueous dispersion comprising an ethylene-vinyl alcohol copolymer (A) and a cellulose nanofiber, the ethylene unit content of the ethylene-vinyl alcohol copolymer (A) being 1 mol % or more and less than 20 mol %.
    Type: Application
    Filed: March 26, 2021
    Publication date: April 20, 2023
    Applicant: KURARAY CO., LTD.
    Inventors: Taeko Kaharu, Yoriko Imaoka, Yuta Taoka, Ayumu Yamamoto
  • Patent number: 11628430
    Abstract: There is provided a method for producing a catalyst liquid containing a Group 6 to 11 transition metal catalyst in which the transition metal catalyst can be prevented from being blackened during storage, the method including performing addition of an alkenyl compound and addition of a phosphorus ligand, and then performing addition of a Group 6 to 11 transition metal catalyst
    Type: Grant
    Filed: February 21, 2018
    Date of Patent: April 18, 2023
    Assignee: KURARAY CO., LTD.
    Inventor: Yusaku Hosaka
  • Publication number: 20230112098
    Abstract: A water-soluble male-type molded hook-and-loop fastener includes a substrate and a plurality of male-type engaging elements, arranged in rows, protruding from the substrate surface. The engaging elements have a shape rising from the substrate surface and curving mid-course in a row direction, or a shape rising from the substrate surface, branching forward and backward mid-course in the row direction and curving in the row direction, with tip portions oriented toward the substrate surface in either shape. The substrate and the engaging elements both contain a mixture of a polyvinyl alcohol, 5 to 30 parts by mass of a polyhydric alcohol- or ethylene oxide-based polymer, and 3 to 20 parts by mass of a layered inorganic particle, based on 100 parts by mass of the polyvinyl alcohol. The polyvinyl alcohol has a degree of polymerization of 300 to 700 and a degree of saponification of 60 to 80% by mole.
    Type: Application
    Filed: February 26, 2021
    Publication date: April 13, 2023
    Applicants: KURARAY FASTENING CO., LTD., KURARAY CO., LTD.
    Inventors: Nobuhiro Koga, Hideki Kamada, Satoru Ono, Yoshikatsu Fujisawa
  • Publication number: 20230113201
    Abstract: A hardly graphitizable carbonaceous material can be used in a negative electrode material for nonaqueous electrolyte secondary batteries (for example, a lithium ion battery) having not only high charge capacity but also high charge-discharge efficiency and being fully charged to be used and a method for producing the same. Such hardly graphitizable carbonaceous material may have an oxygen element content of 0.25% by mass or less.
    Type: Application
    Filed: December 6, 2022
    Publication date: April 13, 2023
    Applicant: KURARAY CO., LTD.
    Inventors: Junji FUJIOKA, Jun-Sang CHO, Taketoshi OKUNO, Hideharu IWASAKI
  • Publication number: 20230105357
    Abstract: In order to maintain high haze value of thermoplastic liquid crystalline polymer while to improve total light transmittance, provided is a thermoplastic liquid crystalline polymer molded body having a haze value of 99% or higher, and a thermal expansion coefficient of 16 to 27 ppm/° C., and satisfying a correlation between a light absorption coefficient (?) and a thickness (x) as: ??0.21x?0.55.
    Type: Application
    Filed: December 9, 2022
    Publication date: April 6, 2023
    Applicant: KURARAY CO., LTD.
    Inventors: Shoma SASAKI, Takahiro NAKASHIMA, Takeshi TAKAHASHI, Shinji HIRAMATSU
  • Publication number: 20230105396
    Abstract: The present invention provides 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 and 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 content obtained by elemental analysis of 3.5 mass % or more, a ratio of nitrogen content and hydrogen content (RN/H) of 6 or more and 100 or less, a ratio of oxygen content and nitrogen content (RO/N) of 0.1 or more and 1.0 or less, and a carbon interplanar spacing (d002) observed by X-ray diffraction measurement of 3.70 ? or more.
    Type: Application
    Filed: December 8, 2022
    Publication date: April 6, 2023
    Applicant: KURARAY CO., LTD.
    Inventors: Takafumi IZAWA, Kengo TACHIKAWA, Hideharu IWASAKI
  • Publication number: 20230109535
    Abstract: Provided are a multilayer body in which base materials composed of a metal, a resin or the like are firmly bonded to each other even when not subjected to primer treatment or the like, and a method for producing the multilayer body. The multilayer body has a base material (X), an adhesive layer (Y), and a base material (Z) in this order, wherein the adhesive layer (Y) contains a hydrogenated block copolymer (A) obtained by hydrogenating a block copolymer (P) containing a polymer block (a) composed of a structural unit derived from an aromatic vinyl compound and a polymer block (b) composed of a structural unit derived from a conjugated diene, the mass ratio [(a)/(b)] of the polymer block (a) to the polymer block (b) is 1/99 to 50/50, and the adhesive layer (Y) has a storage modulus G? at 100° C. of 1.2×105 to 4.0×105 Pa.
    Type: Application
    Filed: February 25, 2021
    Publication date: April 6, 2023
    Applicant: KURARAY CO., LTD.
    Inventors: Daisuke KONISHI, Hiromitsu SASAKI, Yuta TOMISHIMA
  • Publication number: 20230096613
    Abstract: A metal-covered liquid crystal polyester multifilament, comprising: two or more metal-covered liquid crystal polyester monofilaments in which a surface of each liquid crystal polyester monofilament is covered with a metal having a thickness of 0.1 to 20 ?m, wherein in a cross-sectional photograph measured by X-ray CT, a percentage of a number of stuck fibers in which the two or more metal-covered liquid crystal polyester monofilaments are stuck is 75% or less with respect to a total number of fibers.
    Type: Application
    Filed: December 23, 2020
    Publication date: March 30, 2023
    Applicant: KURARAY CO., LTD.
    Inventors: Tomoki SAKAI, Takashi KATAYAMA, Hiroyuki KAWAI, Masashi NISHIDA, Tsugumi YOSHIDA
  • Patent number: 11613602
    Abstract: Provided are a (meth)acrylic block copolymer exhibiting good active energy ray curability, in particular, curability of a blend thereof with an acrylate monomer, and an active energy ray curable composition comprising the (meth)acrylic block copolymer. The (meth)acrylic block copolymer includes a methacrylic polymer block (A) having an active energy ray curable group including a partial structure represented by the general formula (1) below wherein R1 denotes a hydrocarbon group having 1 to 10 carbon atoms, and W denotes a saturated hydrocarbon group having 1 to 10 carbon atoms, and an acrylic polymer block (B) having no active energy ray curable groups.
    Type: Grant
    Filed: November 12, 2018
    Date of Patent: March 28, 2023
    Assignee: KURARAY CO., LTD.
    Inventors: Junya Takai, Kenji Shachi
  • Publication number: 20230090237
    Abstract: Provided are: a resin composition which inhibits the generation of aggregates at the time of melt molding and enables obtaining a molded product which has sufficient heat/light resistance and is unlikely to break down into microplastics after being discarded, the above-mentioned characteristics being sufficiently improved compared to a resin composition obtained using the same ethylene-vinyl alcohol copolymer (EVOH), and the like. The resin composition contains: an ethylene-vinyl alcohol copolymer (A); and an aluminum ion (B), wherein at least a part of the ethylene-vinyl alcohol copolymer (A) comprises, at a polymer end, at least one of a carboxylic acid unit (I) and a lactone ring unit (II), a total content (i+ii) of the carboxylic acid unit (I) and the lactone ring unit (II) per gram of the ethylene-vinyl alcohol copolymer (A) is 14 ?mol/g or more and 78 ?mol/g or less, and a content (b) of the aluminum ion (B) per gram of the ethylene-vinyl alcohol copolymer (A) is 0.002 ?mol/g or more and 0.
    Type: Application
    Filed: June 18, 2020
    Publication date: March 23, 2023
    Applicant: KURARAY CO., LTD.
    Inventors: Mizuko Oshita, Yasuhiro Nonaka
  • Publication number: 20230084915
    Abstract: A curable composition includes a polymer (A) including a structural unit represented by the following general formula (I), and a polythiol compound (B) having at least two thiol groups in one molecule: wherein R1, R2 and R3 each independently represent a hydrogen atom, an alkyl group having 1 to 18 carbon atoms, an alkenyl group having 2 to 18 carbon atoms or an aralkyl group having 7 to 18 carbon atoms, R4 represents a hydrogen atom or a methyl group, and n is an arbitrary integer equal to or greater than 0, and wherein at least one of R1, R2 and R3 is one of the above groups having one or more carbon atoms and/or n is an integer equal to or greater than 1. The curable composition is excellent in curability and provides a flexible cured product.
    Type: Application
    Filed: February 9, 2021
    Publication date: March 16, 2023
    Applicant: KURARAY CO., LTD.
    Inventors: Daiki NOGUCHI, Takashi FUKUMOTO, Naoya KATO
  • Publication number: 20230076995
    Abstract: Provide is a metal-coated liquid-crystal polymer film that is suitable for microcircuit processing and capable of reducing the transmission loss of circuits. The metal-coated liquid-crystal polymer film comprising: a polymer film comprising a polymer film main body capable of forming an optically anisotropic melt phase; a first metal layer layered on at least one side of the polymer film main body; and a second metal layer layered on the first metal layer, wherein in an analysis of oxygen concentration in a thickness direction using XPS, the average oxygen concentration of the first metal layer is 2.5 atom % or less.
    Type: Application
    Filed: October 13, 2022
    Publication date: March 9, 2023
    Applicant: KURARAY CO., LTD.
    Inventors: Kikuo ARIMOTO, Takafumi SAWADA, Yuuichi BANBA, Shuji NAGANO
  • Publication number: 20230073770
    Abstract: A PVA film containing PVA that does not increase carbon dioxide existing in the global environment or has a small increase amount even when carbon dioxide is generated by a biodegradation treatment or an incineration treatment. A polyvinyl alcohol resin film having a polyvinyl alcohol resin with an abundance ratio of carbon 14 in total carbon constituting the polyvinyl alcohol resin of 1.0×10?4 or more. A method for discriminating a polyvinyl alcohol resin film, the method including discriminating a polyvinyl alcohol resin film containing a polyvinyl alcohol resin (Ab) in which at least part of the carbon is derived from bio-derived ethylene.
    Type: Application
    Filed: October 14, 2021
    Publication date: March 9, 2023
    Applicant: KURARAY CO., LTD.
    Inventors: Osamu KAZETO, Yasutaka INUBUSHI
  • Publication number: 20230073744
    Abstract: A curable composition includes, per 100 parts by mass of a curable compound, 0.1 to 10.0 parts by mass of a compound (A) including a structure represented by the following general formula (I), and 0.01 to 10.0 parts by mass of a base (B): where X represents a chalcogen atom, R1 and R2 each independently represent an alkyl group having 1 to 6 carbon atoms, an alkenyl group having 2 to 6 carbon atoms, an aryl group, or an aralkyl group, and R3 and R4 each independently represent a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, an alkenyl group having 2 to 6 carbon atoms, an aryl group, or an aralkyl group.
    Type: Application
    Filed: January 20, 2021
    Publication date: March 9, 2023
    Applicant: KURARAY CO., LTD.
    Inventors: Yuki NISHIJIMA, Daiki NOGUCHI, Takashi FUKUMOTO
  • Publication number: 20230075020
    Abstract: To provide a waterproof sheet for civil engineering, having sufficient strength and elongation even at a low temperature of about ?10° C. and having excellent adhesiveness to a structure such as a tunnel. Disclosed is a waterproof sheet for civil engineering, which has a layer (A) including a composition containing an ethylene-vinyl acetate copolymer (a1) and a thermoplastic resin (a2) other than the ethylene-vinyl acetate copolymer (a1), and a silica-containing layer containing silica, wherein the content of the ethylene-vinyl acetate copolymer (a1) in the composition is 30 to 95% by mass, the content of the thermoplastic resin (a2) is 5 to 70% by mass, and the absolute value of the difference between the SP value of the ethylene-vinyl acetate copolymer (a1) and the SP value of the thermoplastic resin (a2) is less than 0.70 (cal/cm3)1/2.
    Type: Application
    Filed: February 4, 2021
    Publication date: March 9, 2023
    Applicant: KURARAY CO., LTD
    Inventors: Kazumasa KUSUDO, Hiroyuki KAWAI, Takashi KATAYAMA, Shuhei YORIMITSU, Noriko KAWASHIMA, Daisuke KONISHI, Naoyuki YAGUCHI, Kenichi KOJIMA
  • Patent number: 11598034
    Abstract: Provided are a stretchable non-woven fabric including crimped fibers, satisfying the following formula: (?65??55)/(?30??20)?2.5, when a stress ? (N/50 mm) at a strain ? of 20%, 30%, 55% and 65% in a stress-strain curve by a tensile test for at least one direction in a plane direction, is referred to as ?20, ?30, ?55 and ?65, respectively, and a bandage including the non-woven fabric. The non-woven fabric and the bandage lead small deterioration in stretching performance when used repeatedly, and can be excellent in repetition durability.
    Type: Grant
    Filed: August 25, 2015
    Date of Patent: March 7, 2023
    Assignee: KURARAY CO., LTD.
    Inventors: Satoshi Koizumi, Sumito Kiyooka, Yasurou Araida
  • Publication number: 20230060402
    Abstract: There is provided a molded article for water related application which can prevent molecular cleavage of polyamide caused by a radical generated from a chlorine-based oxidizing substance contained for sterilization in tap water, thereby preventing a degradation in the performance of the molded article. The molded article for water related application comprises a resin composition comprising; 100 parts by mass of a semi-aromatic polyamide (A); 10 to 200 parts by mass of an inorganic filler (B); and 0.1 to 2.0 parts by mass of a phenolic antioxidant (C), wherein the semi-aromatic polyamide (A) includes dicarboxylic acid units composed mainly of aromatic dicarboxylic acid units, and diamine units composed mainly of aliphatic diamine units, and wherein the phenolic antioxidant (C) has, in the molecule, a structure represented by the following formula (1); where ** represents a linking moiety.
    Type: Application
    Filed: February 8, 2021
    Publication date: March 2, 2023
    Applicant: KURARAY CO., LTD.
    Inventor: Nobuhiro OYA
  • Publication number: 20230069427
    Abstract: The present invention relates to a resin composition, comprising: a modified vinyl acetal resin which comprises 20 to 80 mol % of ethylene units and 4 to 76 mol % of vinyl alcohol units based on all monomer units constituting the resin, and has an acetalization degree of 5 to 80 mol %; and an alkali metal salt and/or an alkaline earth metal salt of a strong acid, wherein a total content of the alkali metal salt and/or the alkaline earth metal salt of the strong acid is 0.0005 to 0.06 part by mass with respect to 100 parts by mass of the modified vinyl acetal resin.
    Type: Application
    Filed: December 18, 2020
    Publication date: March 2, 2023
    Applicant: KURARAY CO., LTD.
    Inventors: Takuro NIIMURA, Akio TAKASUGI, Atsuhiro NAKAHARA, Yoshiaki ASANUMA
  • Publication number: 20230065457
    Abstract: Provided is a thermoplastic elastomer composition and the like which can have improved vibration-damping properties while retaining properties inherent in a polyester-based thermoplastic elastomer. The thermoplastic elastomer composition contains a polyester-based thermoplastic elastomer (A) and a hydrogenated aromatic vinyl compound-based elastomer (B) having a glass transition temperature Tg of ?10 to 40° C., wherein the hydrogenated aromatic vinyl compound-based elastomer (B) is a hydrogenate of a block copolymer containing a polymer block (a) having a structural unit derived from an aromatic vinyl compound and a polymer block (b) having a structural unit derived from a conjugated diene compound, and the ratio by mass of the polyester-based thermoplastic elastomer (A) to the hydrogenated aromatic vinyl compound-based elastomer (B), (A/B) is 99/1 to 1/99.
    Type: Application
    Filed: December 10, 2020
    Publication date: March 2, 2023
    Applicant: KURARAY CO., LTD.
    Inventors: Yasushi SENDA, Masahiro KATO