Patents Assigned to Nippon Chemical Industrial Co., Ltd.
  • Patent number: 11773120
    Abstract: In the method for producing an optically active 2,3-bisphosphinopyrazine derivative of the present invention, an optically active 2,3-bisphosphinopyrazine derivative represented by the following formula (3) is produced by the step of: preparing solution A containing 2,3-dihalogenopyrazine represented by the following formula (1) and a carboxylic acid amide coordinating solvent, lithiating an optically active R- or S-isomer of a hydrogen-phosphine borane compound represented by the following formula (2) to give a lithiated phosphine borane compound; adding solution B containing the lithiated phosphine borane compound to the solution A to perform an aromatic nucleophilic substitution reaction; and then performing a deboranation reaction. (For symbols in the formulas, see the description.
    Type: Grant
    Filed: June 15, 2018
    Date of Patent: October 3, 2023
    Assignee: NIPPON CHEMICAL INDUSTRIAL CO., LTD.
    Inventors: Daisuke Mayama, Satoshi Takeshita, Ken Tamura
  • Patent number: 11692134
    Abstract: The present invention relates to a method for producing an InP-based quantum dot precursor from a phosphorus source and an indium source, in which a silylphosphine compound represented by the following Formula (1) with a content of a compound represented by the following Formula (2) of 0.3 mol % or less is used as the phosphorus source. Further, the present invention provides a method for producing an InP-based quantum dot comprising heating an InP quantum dot precursor to a temperature of 200° C. or more and 350° C. or less to obtain an InP quantum dot. (R is as defined in the specification.
    Type: Grant
    Filed: March 26, 2020
    Date of Patent: July 4, 2023
    Assignee: NIPPON CHEMICAL INDUSTRIAL CO., LTD.
    Inventors: Kazuhiro Nakatsui, Taiki Tsuzukiishi, Tomo Sakanoue
  • Publication number: 20230167359
    Abstract: The silyl phosphine compound of the present invention is represented by the formula (1) and has an arsenic content of not more than 1 ppm. The process for producing a silyl phosphine compound of the present invention is a process comprising mixing a basic compound, a silylating agent and phosphine to obtain a solution containing a silyl phosphine compound, removing a solvent from the solution to obtain a concentrated solution of a silyl phosphine compound, and distilling the concentrated solution, wherein an arsenic content in the phosphine is adjusted to not more than 1 ppm by volume in terms of arsine. The process for producing InP quantum dots of the present invention uses, as a phosphorus source, a silyl phosphine compound represented by the formula (1) and having an arsenic content of not more than 1 ppm by mass. (For definition of R, see the specification.
    Type: Application
    Filed: January 10, 2023
    Publication date: June 1, 2023
    Applicant: Nippon Chemical Industrial Co., Ltd.
    Inventors: Yosuke Takubo, Ken Tamura, Kazuhiro Nakatsui
  • Patent number: 11659768
    Abstract: Provided is a piezoelectric material filler including alkali niobate compound particles having a ratio (K/(Na+K)) of the number of moles of potassium to the total number of moles of sodium and potassium of 0.460 to 0.495 in terms of atoms and a ratio ((Li+Na+K)/Nb) of the total number of moles of alkali metal elements to the number of moles of niobium of 0.995 to 1.005 in terms of atoms. The present invention can provide a piezoelectric material filler having excellent piezoelectric properties, and a composite piezoelectric material including the piezoelectric material filler and a polymer matrix.
    Type: Grant
    Filed: December 6, 2021
    Date of Patent: May 23, 2023
    Assignee: NIPPON CHEMICAL INDUSTRIAL CO., LTD.
    Inventors: Shinji Tanabe, Hajime Kunita, Shunsuke Kikuchi
  • Patent number: 11646408
    Abstract: The positive electrode active substance for a lithium secondary battery includes a mixture of a lithium cobalt composite oxide particle and an inorganic fluoride particle. The method for producing a positive electrode active substance for a lithium secondary battery includes a first step of subjecting a lithium cobalt composite oxide particle and an inorganic fluoride particle to a mixing treatment to thereby obtain a mixture of the lithium cobalt composite oxide particle and the inorganic fluoride particle. The lithium secondary battery uses, as a positive electrode active substance, the positive electrode active substance for a lithium secondary battery of the present invention.
    Type: Grant
    Filed: October 9, 2019
    Date of Patent: May 9, 2023
    Assignee: NIPPON CHEMICAL INDUSTRIAL CO., LTD.
    Inventors: Masahiro Kikuchi, Tomonao Naruhashi, Minoru Fukuchi
  • Patent number: 11578266
    Abstract: The silyl phosphine compound of the present invention is represented by the formula (1) and has an arsenic content of not more than 1 ppm. The process for producing a silyl phosphine compound of the present invention is a process comprising mixing a basic compound, a silylating agent and phosphine to obtain a solution containing a silyl phosphine compound, removing a solvent from the solution to obtain a concentrated solution of a silyl phosphine compound, and distilling the concentrated solution, wherein an arsenic content in the phosphine is adjusted to not more than 1 ppm by volume in terms of arsine. The process for producing InP quantum dots of the present invention uses, as a phosphorus source, a silyl phosphine compound represented by the formula (1) and having an arsenic content of not more than 1 ppm by mass. (For definition of R, see the specification.
    Type: Grant
    Filed: March 20, 2019
    Date of Patent: February 14, 2023
    Assignee: NIPPON CHEMICAL INDUSTRIAL CO., LTD.
    Inventors: Yosuke Takubo, Ken Tamura, Kazuhiro Nakatsui
  • Patent number: 11554968
    Abstract: An object of the present invention is to provide a positive electrode active substance for a lithium secondary battery, the positive electrode active substance, when being used as a positive electrode active substance for a lithium secondary battery, being little in deterioration of cycle characteristics and being high in the energy density retention rate, even in repetition of charge and discharge at high voltages, and a lithium secondary battery little in deterioration of cycle characteristics and high in the energy density retention rate, even in repetition of charge and discharge at high voltages. The positive electrode active substance for a lithium secondary battery comprises a lithium cobalt-based composite oxide particle having a Ti-containing compound and an Mg-containing compound adhered on at least part of the particle surface.
    Type: Grant
    Filed: August 27, 2020
    Date of Patent: January 17, 2023
    Assignee: NIPPON CHEMICAL INDUSTRIAL CO., LTD.
    Inventor: Masahiro Kikuchi
  • Patent number: 11512103
    Abstract: The silyl phosphine compound is represented by the following general formula (1). A content of a compound represented by the following general formula (2) is not more than 0.3 mol %. In the general formula (1), each R is independently an alkyl group having not less than 1 and not more than 5 carbon atoms or an aryl group having not less than 6 and not more than 10 carbon atoms. In the general formula (2), R is the same as in the general formula (1).
    Type: Grant
    Filed: January 28, 2021
    Date of Patent: November 29, 2022
    Assignee: NIPPON CHEMICAL INDUSTRIAL CO., LTD.
    Inventors: Yosuke Takubo, Ken Tamura
  • Patent number: 11498935
    Abstract: There is provided a novel optically active bisphosphinomethane useful as a ligand for an asymmetric catalyst, excellent in oxidation resistance in air, and easy in handling. There is also provided a transition metal complex using the optically active bisphosphinoraethane having excellent asymmetric catalytic ability as a ligand. The optically active bisphosphinomethane is represented by the general formula (1), and the transition metal complex has the optically active bisphosphinomethane as a ligand. (In the formula, R1 represents an adamantyl group; R2 represents a branched alkyl group having 3 or more carbon atoms; and * represents an asymmetric center on a phosphorus atom.
    Type: Grant
    Filed: June 9, 2020
    Date of Patent: November 15, 2022
    Assignee: NIPPON CHEMICAL INDUSTRIAL CO., LTD.
    Inventors: Tsuneo Imamoto, Ken Tamura, Natsuhiro Sano
  • Patent number: 11453687
    Abstract: A production method by which a biarylphosphine useful as a Buchwald phosphine ligand can be obtained in high purity is provided through an industrially advantageous process. The production method of a biarylphosphine comprises a step A of reacting a lithiated product obtained through lithiation of a halogenated benzene derivative with a benzene derivative to obtain a biphenyl derivative, and a step B of the reacting the biphenyl derivative with a halogenated phosphine. In the step A, the charge molar ratio of the halogenated benzene derivative to the benzene derivative is preferably 1.0 to 5.0.
    Type: Grant
    Filed: March 30, 2020
    Date of Patent: September 27, 2022
    Assignee: NIPPON CHEMICAL INDUSTRIAL CO., LTD.
    Inventors: Ken Tamura, Yuki Sawatsugawa, Natsuhiro Sano
  • Publication number: 20220298025
    Abstract: An object of the present invention is to provide a positive electrode active substance for a lithium secondary battery, the positive electrode active substance, when being used as a positive electrode active substance for a lithium secondary battery, being little in deterioration of cycle characteristics and being high in the energy density retention rate, even in repetition of charge and discharge at high voltages, and a lithium secondary battery little in deterioration of cycle characteristics and high in the energy density retention rate, even in repetition of charge and discharge at high voltages. The positive electrode active substance for a lithium secondary battery comprises a lithium cobalt-based composite oxide particle having a Ti-containing compound and an Mg-containing compound adhered on at least part of the particle surface.
    Type: Application
    Filed: August 27, 2020
    Publication date: September 22, 2022
    Applicant: NIPPON CHEMICAL INDUSTRIAL CO., LTD.
    Inventor: Masahiro Kikuchi
  • Patent number: 11407863
    Abstract: A coated particle according to the present invention is a coated particle containing a conductive metal-coated particle having a metal film formed on a surface of a core material, the conductive metal-coated particle coated with an insulation layer containing a polymer, wherein the insulation layer has a phosphonium group. The insulation layer preferably contains an insulating fine particle and the fine particle has a phosphonium group on a surface thereof, or the insulation layer is preferably a film having a phosphonium group. In addition, the metal is preferably at least one selected from nickel, gold, nickel alloys, and gold alloys. The polymer constituting the insulation layer is preferably at least one polymerized product selected from styrenes, esters, and nitriles.
    Type: Grant
    Filed: April 25, 2018
    Date of Patent: August 9, 2022
    Assignee: NIPPON CHEMICAL INDUSTRIAL CO., LTD.
    Inventors: Tomonao Naruhashi, Natsuhiro Sano, Eri Furui
  • Patent number: 11400432
    Abstract: Provided are a silicotitanate molded body having high strength and reduced generation of fine powder, a production method thereof, an adsorbent comprising the silicotitanate molded body, and a decontamination method of radioactive cesium and/or radioactive strontium by using the adsorbent. The silicotitanate molded body comprises: crystalline silicotitanate particles that have a particle size distribution in which 90% or more, on volume basis, of the particles have a particle size within a range of 1 ?m or more and 10 ?m or less and that are represented by a general formula of A2Ti2O3(SiO4).nH2O wherein A represents one or two alkali metal elements selected from Na and K, and n represents a number of 0 to 2; and an oxide of one or more elements selected from the group consisting of aluminum, zirconium, iron, and cerium.
    Type: Grant
    Filed: July 3, 2018
    Date of Patent: August 2, 2022
    Assignee: NIPPON CHEMICAL INDUSTRIAL CO., LTD.
    Inventors: Takashi Sakuma, Makoto Komatsu, Takeshi Izumi, Shinsuke Miyabe, Takeshi Sakamoto, Eiji Noguchi, Kaori Sugihara
  • Patent number: 11404720
    Abstract: An X-ray diffractometrically single-phase lithium titanium phosphate can be obtained by an industrially advantageous method. Provided is a method for producing the lithium titanium phosphate having a NASICON structure represented by the following general formula (1): Li1+xMx(Ti1?yAy)2?x(PO4)3 (1), and provided is a method comprising a first step of preparing a raw material mixed slurry (1) comprising, at least, titanium dioxide, phosphoric acid and a surfactant, a second step of heat treating the raw material mixed slurry (1) to obtain a raw material heat-treated slurry (2), a third step of mixing the raw material heat-treated slurry (2) with a lithium source to obtain a lithium-containing raw material heat-treated slurry (3), a fourth step of subjecting the lithium-containing raw material heat-treated slurry (3) to a spray drying treatment to obtain a reaction precursor containing, at least, Ti, P and Li, and a fifth step of firing the reaction precursor.
    Type: Grant
    Filed: January 27, 2020
    Date of Patent: August 2, 2022
    Assignee: NIPPON CHEMICAL INDUSTRIAL CO., LTD.
    Inventors: Junya Fukazawa, Toru Hata, Takuma Kato
  • Patent number: 11384024
    Abstract: A negative thermal expansion material made of zirconium phosphate tungstate containing an Al atom, and having a thermal expansion coefficient of ?2.0×10?6 to ?3.3×10?6/K. According to the present invention, a negative thermal expansion material made of zirconium phosphate tungstate having various thermal expansion coefficients, and an industrially advantageous manufacturing method thereof can be provided.
    Type: Grant
    Filed: June 14, 2019
    Date of Patent: July 12, 2022
    Assignee: Nippon Chemical Industrial Co., Ltd.
    Inventors: Junya Fukazawa, Toru Hata
  • Publication number: 20220204537
    Abstract: There is provided a novel optically active bisphosphinomethane useful as a ligand for an asymmetric catalyst, excellent in oxidation resistance in air, and easy in handling. There is also provided a transition metal complex using the optically active bisphosphinoraethane having excellent asymmetric catalytic ability as a ligand. The optically active bisphosphinomethane is represented by the general formula (1), and the transition metal complex has the optically active bisphosphinomethane as a ligand. (In the formula, R1 represents an adamantyl group; R2 represents a branched alkyl group having 3 or more carbon atoms; and * represents an asymmetric center on a phosphorus atom.
    Type: Application
    Filed: June 9, 2020
    Publication date: June 30, 2022
    Applicant: NIPPON CHEMICAL INDUSTRIAL CO., LTD.
    Inventors: Tsuneo Imamoto, Ken Tamura, Natsuhiro Sano
  • Publication number: 20220194889
    Abstract: A method for producing an indium carboxylate of the present invention comprises the steps of reacting a hydroxyl group-containing indium carboxylate represented by Formula (1): In(RCOO)3-x(OH)x, wherein R is a straight chain or branched chain aliphatic group having 0 to 5 carbon atoms, and x is a number more than 0 and less than 3, with a lower carboxylic acid represented by the following Formula (2): R?COOH, wherein R? is a hydrogen atom or a straight chain or branched chain aliphatic group having 1 to 5 carbon atoms, and the hydrogen atom in the aliphatic group may be replaced with a halogen atom, so as to obtain a product; and then reacting the product with a higher carboxylic acid having 12 or more carbon atoms.
    Type: Application
    Filed: March 26, 2020
    Publication date: June 23, 2022
    Applicant: NIPPON CHEMICAL INDUSTRIAL CO., LTD.
    Inventors: Kazuhiro Nakatsui, Taiki Tsuzukiishi
  • Publication number: 20220195299
    Abstract: The present invention relates to a method for producing an InP-based quantum dot precursor from a phosphorus source and an indium source, in which a silylphosphine compound represented by the following Formula (1) with a content of a compound represented by the following Formula (2) of 0.3 mol % or less is used as the phosphorus source. Further, the present invention provides a method for producing an InP-based quantum dot comprising heating an InP quantum dot precursor to a temperature of 200° C. or more and 350° C. or less to obtain an InP quantum dot. (R is as defined in the specification.
    Type: Application
    Filed: March 26, 2020
    Publication date: June 23, 2022
    Applicant: NIPPON CHEMICAL INDUSTRIAL CO., LTD.
    Inventors: Kazuhiro Nakatsui, Taiki Tsuzukiishi, Tomo Sakanoue
  • Publication number: 20220169667
    Abstract: A production method by which a biarylphosphine useful as a Buchwald phosphine ligand can be obtained in high purity is provided through an industrially advantageous process. The production method of a biarylphosphine comprises a step A of reacting a lithiated product obtained through lithiation of a halogenated benzene derivative with a benzene derivative to obtain a biphenyl derivative, and a step B of the reacting the biphenyl derivative with a halogenated phosphine. In the step A, the charge molar ratio of the halogenated benzene derivative to the benzene derivative is preferably 1.0 to 5.0.
    Type: Application
    Filed: March 30, 2020
    Publication date: June 2, 2022
    Applicant: NIPPON CHEMICAL INDUSTRIAL CO., LTD.
    Inventors: Ken Tamura, Yuki Sawatsugawa, Natsuhiro Sano
  • Patent number: 11332599
    Abstract: There is provided a modified zirconium phosphate tungstate which effectively suppresses the elution of phosphorus ions even when it contacts with water, can develop the performance excellent as a negative thermal expansion material, and can be dispersed in a polymer compound such as a resin, and use of which enables a low-thermal expansive material containing a negative thermal expansion filler to be well produced. The surface of a zirconium phosphate tungstate particle is coated with an inorganic compound containing one or two or more elements (M) selected from Zn, Si, Al, Ba, Ca, Mg, Ti, V, Sn, Co, Fe and Zr. The BET specific surface area of the zirconium phosphate tungstate particle is preferably 0.1 m2/g to 50 m2/g.
    Type: Grant
    Filed: February 28, 2020
    Date of Patent: May 17, 2022
    Assignee: NIPPON CHEMICAL INDUSTRIAL CO., LTD.
    Inventors: Junya Fukazawa, Toru Hata, Takuma Kato