Patents by Inventor Toshiharu Hirai

Toshiharu Hirai 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).

  • Publication number: 20200392374
    Abstract: Provided is a dispersion liquid of silica particles, comprising silica particles having an average particle diameter of 5 to 300 nm determined from an electron micrograph and a density of 1.20 g/cm3 or more determined from a specific surface area determined by a BET method using nitrogen adsorption, wherein the dispersion liquid has a pH of less than 8, a silica concentration of 12 to 40% by mass, and a viscosity in terms of a silica concentration of 20% by mass of 40 mPa·s or less. When this silica particle is used as an abrasive, it is possible to realize a sufficient polishing speed and a smooth polished surface on which occurrence of scratches is suppressed.
    Type: Application
    Filed: November 15, 2018
    Publication date: December 17, 2020
    Applicant: JGC CATALYSTS AND CHEMICALS LTD.
    Inventors: Miki EGAMI, Mitsuaki KUMAZAWA, Hirotada ARAKANE, Ryo MURAGUCHI, Toshiharu HIRAI
  • Publication number: 20200231451
    Abstract: A method for producing a dispersion liquid of silica particles, by simultaneously adding a liquid A containing silane alkoxide and a liquid B containing an alkali catalyst and water to a liquid I containing silica seed particles to cause the particles to grow, so as to produce silica particles; wherein the variation rate of the mole ratio of the alkali catalyst to silica components in the reaction system during a period from the start to the end of the addition relative to the initial mole ratio is 0.90 to 1.10; and the variation rate of the mole ratio of water to the silica components in the reaction system during a period from the start to the end of the addition relative to the initial mole ratio is 0.90 to 1.10.
    Type: Application
    Filed: March 29, 2018
    Publication date: July 23, 2020
    Applicant: JGC CATALYSTS AND CHEMICALS LTD.
    Inventors: Miki EGAMI, Mitsuaki KUMAZAWA, Hirotada ARAKANE, Ryo MURAGUCHI, Toshiharu HIRAI
  • Publication number: 20190359491
    Abstract: A method for producing a liquid dispersion containing irregular-shaped silica particles in which two or more primary particles are linked together, by simultaneously adding a liquid A containing silane alkoxide and a liquid B containing an alkali catalyst and water to a liquid I consisting substantially of an organic solvent to cause hydrolysis and polycondensation of the silane alkoxide, wherein the period from the start of the addition until the silica concentration of the reaction system at the end of the addition reaches 70% is 20% or less of the full reaction time period.
    Type: Application
    Filed: January 18, 2018
    Publication date: November 28, 2019
    Applicant: JGC CATALYSTS AND CHEMICALS LTD.
    Inventors: Miki EGAMI, Mitsuaki KUMAZAWA, Hirotada ARAKANE, Ryo MURAGUCHI, Toshiharu HIRAI
  • Patent number: 10301183
    Abstract: Producing a silica particle by inhibiting the generation of incompletely reacted materials such as oligomers which have not been grown to the silica particles having the intended particle size. A dispersion liquid of a silica particle is produced by simultaneously adding, to a liquid substantially consisting of an organic solvent, a liquid containing silane alkoxide and a liquid containing an alkali catalyst and water to cause hydrolysis and polycondensations to produce a silica particle. The variation rate of the mole ratio of the alkali catalyst to silane alkoxide in the reaction system for a period from the start to the end of the reaction relative to the initial mole ratio is 0.90 to 1.10; and the variation rate of the mole ratio of water to silane alkoxide for a period from the start to the end of the reaction relative to the initial mole ratio is 0.90 to 1.10.
    Type: Grant
    Filed: December 27, 2017
    Date of Patent: May 28, 2019
    Assignee: JGC CATALYSTS AND CHEMICALS LTD.
    Inventors: Miki Egami, Mitsuaki Kumazawa, Hirotada Arakane, Ryo Muraguchi, Toshiharu Hirai
  • Patent number: 10239759
    Abstract: A method of producing silica-based particles includes, when a dispersion liquid of composite oxide particles is prepared by simultaneously adding an aqueous silicate solution and/or an acidic silicic acid solution and an aqueous solution of an alkali-soluble inorganic compound in an alkali aqueous solution or in an alkali aqueous solution with seed particles dispersed therein, if required, the aqueous silicate solution and/or the acidic silicic acid solution and the aqueous solution of alkali-soluble inorganic compound are added so that the molar ratio of MOx/SiO2 are in a range from 0.01 to 2, herein MOx denoting an inorganic oxide other than silica and SiO2 denoting silica to prepare the dispersion liquid of composite oxide particles with an average diameter (Dp1) in a range from 3 to 300 nm.
    Type: Grant
    Filed: January 28, 2015
    Date of Patent: March 26, 2019
    Assignee: JGC CATALYSTS AND CHEMICALS LTD.
    Inventors: Ryo Muraguchi, Mitsuaki Kumazawa, Toshiharu Hirai
  • Patent number: 10190023
    Abstract: Provided is a silica-based polishing particle which can polish and flatten the surface of a substrate at a sufficient polishing rate with generation of scratches prevented, and successfully prevents generation of particle residues on a substrate after polishing. A silica-based polishing particle with a three-dimensional polycondensation structure containing an alkoxy group, wherein the particle has an average particle diameter (d) of 5 to 300 nm, an aspect ratio of 1.00 or more and 1.20 or less, and a carbon content of 0.005% by mass or more and less than 0.50% by mass.
    Type: Grant
    Filed: November 6, 2017
    Date of Patent: January 29, 2019
    Assignee: JGC CATALYSTS AND CHEMICALS LTD.
    Inventors: Mitsuaki Kumazawa, Miki Egami, Hirotada Arakane, Ryo Muraguchi, Toshiharu Hirai
  • Patent number: 10184069
    Abstract: Provided is a silica-based polishing particle, particularly suitable for primary polishing, which provides a high polishing rate on the surface of a substrate and which prevents particle residues on the substrate after polishing, and an abrasive including the silica-based polishing particle. A silica-based polishing particle with a three-dimensional polycondensation structure containing an alkoxy group, wherein the particle has an average particle diameter (d) of 5 to 300 nm, an aspect ratio of more than 1.20 and 5.00 or less, and a carbon content of 0.005% by mass or more and less than 0.50% by mass.
    Type: Grant
    Filed: December 1, 2017
    Date of Patent: January 22, 2019
    Assignee: JGC CATALYSTS AND CHEMICALS LTD.
    Inventors: Mitsuaki Kumazawa, Miki Egami, Hirotada Arakane, Ryo Muraguchi, Toshiharu Hirai
  • Patent number: 10040943
    Abstract: Hollow silica-based particles having cavities inside the outer shell having a low refractive index. The method of producing the silica-based particles comprises the following steps (a) and (b): (a) a step in which, when an aqueous silicate solution and/or an acidic silicic acid solution and an aqueous solution of an alkali-soluble inorganic compound are simultaneously added in an alkali aqueous solution to prepare a dispersion liquid of composite oxide particles, an electrolytic salt is added at the molar ratio of a mole number of the electrolytic salt (ME) versus that of SiO2 (MS) [(ME)/(MS)] in the range from 0.1 to 10, and (b) a step of furthermore adding an electrolytic salt, if necessary, to the dispersion liquid of composite oxide particles and then removing at least a portion of elements constituting the composite oxide other than silicon by adding an acid to prepare a dispersion liquid of silica-based particles.
    Type: Grant
    Filed: July 8, 2004
    Date of Patent: August 7, 2018
    Assignee: JGC CATALYSTS AND CHEMICALS LTD.
    Inventors: Ryo Muraguchi, Mitsuaki Kumazawa, Toshiharu Hirai, Masafumi Hirai
  • Publication number: 20180179076
    Abstract: Producing a silica particle by inhibiting the generation of incompletely reacted materials such as oligomers which have not been grown to the silica particles having the intended particle size. A dispersion liquid of a silica particle is produced by simultaneously adding, to a liquid substantially consisting of an organic solvent, a liquid containing silane alkoxide and a liquid containing an alkali catalyst and water to cause hydrolysis and polycondensations to produce a silica particle. The variation rate of the mole ratio of the alkali catalyst to silane alkoxide in the reaction system for a period from the start to the end of the reaction relative to the initial mole ratio is 0.90 to 1.10; and the variation rate of the mole ratio of water to silane alkoxide for a period from the start to the end of the reaction relative to the initial mole ratio is 0.90 to 1.10.
    Type: Application
    Filed: December 27, 2017
    Publication date: June 28, 2018
    Applicant: JGC CATALYSTS AND CHEMICALS LTD.
    Inventors: Miki EGAMI, Mitsuaki KUMAZAWA, Hirotada ARAKANE, Ryo MURAGUCHI, Toshiharu HIRAI
  • Publication number: 20180155591
    Abstract: Provided is a silica-based polishing particle, particularly suitable for primary polishing, which provides a high polishing rate on the surface of a substrate and which prevents particle residues on the substrate after polishing, and an abrasive including the silica-based polishing particle. A silica-based polishing particle with a three-dimensional polycondensation structure containing an alkoxy group, wherein the particle has an average particle diameter (d) of 5 to 300 nm, an aspect ratio of more than 1.20 and 5.00 or less, and a carbon content of 0.005% by mass or more and less than 0.50% by mass.
    Type: Application
    Filed: December 1, 2017
    Publication date: June 7, 2018
    Applicant: JGC CATALYSTS AND CHEMICALS LTD.
    Inventors: Mitsuaki KUMAZAWA, Miki EGAMI, Hirotada ARAKANE, Ryo MURAGUCHI, Toshiharu HIRAI
  • Publication number: 20180127627
    Abstract: Provided is a silica-based polishing particle which can polish and flatten the surface of a substrate at a sufficient polishing rate with generation of scratches prevented, and successfully prevents generation of particle residues on a substrate after polishing. A silica-based polishing particle with a three-dimensional polycondensation structure containing an alkoxy group, wherein the particle has an average particle diameter (d) of 5 to 300 nm, an aspect ratio of 1.00 or more and 1.20 or less, and a carbon content of 0.005% by mass or more and less than 0.50% by mass.
    Type: Application
    Filed: November 6, 2017
    Publication date: May 10, 2018
    Applicant: JGC CATALYSTS AND CHEMICALS LTD.
    Inventors: Mitsuaki KUMAZAWA, Miki EGAMI, Hirotada ARAKANE, Ryo MURAGUCHI, Toshiharu HIRAI
  • Patent number: 9834663
    Abstract: A composition for forming a transparent coating film including hollow silica microparticles and a binder is provided. The hollow silica microparticles have an average particle diameter of 5 to 300 nm when measured by the dynamic light scattering method, a specific surface area of 50 to 1500 m2/g, and an outer shell in which cavities are formed. The microparticles lose weight by 1.0 W % or more at a temperature in the range of from 200° C. to 500° C. when measured by the thermogravimetry (TG). A surface charge (QA) of the hollow silica microparticles contained in the compositions for forming a transparent coating film is in the range from 5 to 20 ?eq/g.
    Type: Grant
    Filed: April 28, 2015
    Date of Patent: December 5, 2017
    Assignee: JGC Catalysts and Chemicals Ltd.
    Inventors: Ryota Sueyoshi, Ryo Muraguchi, Masayuki Matsuda, Mitsuaki Kumazawa, Toshiharu Hirai
  • Patent number: 9834450
    Abstract: A dispersion liquid contains fine particles of core-shell type inorganic oxide that have high dispersion stability and transparency and allow for excellent light resistance and weather resistance by being mixed in a coating film. The fine particles are produced by treating the surfaces of (a) fine particles of titanium-containing metal oxide serving as core particles with a hydrate and/or an oxide of a metal element such as zirconium to provide surface-treated particles or fine particles of titanium-containing metal oxide having (b) an intermediate layer and by covering the surfaces of the surface-treated particles to form (c) a shell layer with a composite oxide of silicon and at least one metal element selected from aluminum, zirconium, and antimony.
    Type: Grant
    Filed: September 8, 2011
    Date of Patent: December 5, 2017
    Assignee: JGC Catalysts and Chemicals Ltd.
    Inventors: Yoichi Ishihara, Toshiharu Hirai
  • Patent number: 9534122
    Abstract: Provided are surface-treated fine particles which, when added to coatings for the production of films, exhibit excellent reactivity with respect to organosilicon compounds and resins that are matrix components of the coating films, and thereby allow the films to exhibit excellent performance. Oligomer-modified fine particles include inorganic oxide fine particles having a surface modified with an oligomer, the oligomer being derived from a metal alkoxide represented by Formula (1): RnM1(OR?)z-n (1) wherein M1: one or more elements selected from Si, Ti, Zr and Al; R and R?: one or more groups selected from alkyl groups of 1 to 8 carbon atoms, aryl groups and vinyl groups; n: an integer of from 0 to (z?2); and z: the valence of M1. The oligomer has a polymerization degree of 3 or more. The oligomer has a weight average molecular weight in the range of 1000 to 10000.
    Type: Grant
    Filed: December 21, 2012
    Date of Patent: January 3, 2017
    Assignee: JGC Catalysts and Chemicals Ltd.
    Inventors: Yoichi Ishihara, Toshiharu Hirai
  • Patent number: 9441095
    Abstract: A method of producing hollow silica microparticles that suppress whitening of a transparent coating film and show excellent abrasion resistance and adhesiveness. The method includes preparation of an organosol in which hollow silica microparticles are dispersed with the silica concentration of 1 to 70 W % and addition of a silane compound and an alkali catalyst to the organosol at a temperature in the range from 30° C. to 300° C. to react the silane compound to the hollow silica microparticles under the condition where a quantity of water against the added silica (the hollow silica microparticles) is in the range from 0.1 to 50 W %.
    Type: Grant
    Filed: January 18, 2012
    Date of Patent: September 13, 2016
    Assignee: JGC CATALYSTS AND CHEMICALS LTD.
    Inventors: Ryota Sueyoshi, Ryo Maruguchi, Masayuki Matsuda, Mitsuaki Kumazawa, Toshiharu Hirai
  • Patent number: 9234106
    Abstract: Core-shell type composite oxide fine particles are described in which the core particles are oxide fine particles or composite oxide fine particles that do not contain silicon and/or aluminum as main components, and the surface of the core particles is covered with a shell including a composite oxide that contains silicon and aluminum as main components, the shell containing silicon and aluminum in a weight ratio in terms of oxides, SiO2/Al2O3, in the range of 2.0 to 30.0. A dispersion liquid of the core-shell type composite oxide fine particles exhibits very high stability.
    Type: Grant
    Filed: July 26, 2010
    Date of Patent: January 12, 2016
    Assignee: JGC Catalysts and Chemicals Ltd.
    Inventors: Yoichi Ishihara, Toshiharu Hirai, Michio Komatsu
  • Publication number: 20150259512
    Abstract: A method of producing hollow silica microparticles that suppress whitening of a transparent coating film and show excellent abrasion resistance and adhesiveness. The method includes preparation of an organosol in which hollow silica microparticles are dispersed with the silica concentration of 1 to 70 W % and addition of a silane compound and an alkali catalyst to the organosol at a temperature in the range from 30° C. to 300° C. to react the silane compound to the hollow silica microparticles under the condition where a quantity of water against the added silica (the hollow silica microparticles) is in the range from 0.1 to 50 W %.
    Type: Application
    Filed: April 28, 2015
    Publication date: September 17, 2015
    Inventors: Ryota Sueyoshi, Ryo Muraguchi, Masayuki Matsuda, Mitsuaki Kumazawa, Toshiharu Hirai
  • Publication number: 20150147469
    Abstract: A method of producing silica-based particles includes, when a dispersion liquid of composite oxide particles is prepared by simultaneously adding an aqueous silicate solution and/or an acidic silicic acid solution and an aqueous solution of an alkali-soluble inorganic compound in an alkali aqueous solution or in an alkali aqueous solution with seed particles dispersed therein, if required, the aqueous silicate solution and/or the acidic silicic acid solution and the aqueous solution of alkali-soluble inorganic compound are added so that the molar ratio of MOx/SiO2 are in a range from 0.01 to 2, herein MOx denoting an inorganic oxide other than silica and SiO2 denoting silica to prepare the dispersion liquid of composite oxide particles with an average diameter (Dp1) in a range from 3 to 300 nm.
    Type: Application
    Filed: January 28, 2015
    Publication date: May 28, 2015
    Inventors: Ryo MURAGUCHI, Mitsuaki KUMAZAWA, Toshiharu HIRAI
  • Patent number: 8974592
    Abstract: The present invention relates to a coating composition containing metal oxide particles with a high refractive index and low photocatalytic activity and a coating film obtained by applying the coating composition onto a substrate. The coating composition contains metal oxide particles with a high refractive index obtained by coating the specific fine particles of the titanium-based oxide on their surfaces with at least a silica-based oxide or a silica-based composite oxide, and the coating film is obtained by applying the coating composition onto a substrate. The metal oxide particles with not only a high refractive index but also low photocatalytic activity, and therefore a coating film with excellent weathering resistance and light resistance can be formed on a substrate.
    Type: Grant
    Filed: August 12, 2009
    Date of Patent: March 10, 2015
    Assignee: JGC Catalysts and Chemicals, Ltd.
    Inventors: Yoichi Ishihara, Sachio Murai, Toshiharu Hirai, Michio Komatsu
  • Publication number: 20140316046
    Abstract: Provided are surface-treated fine particles which, when added to coatings for the production of films, exhibit excellent reactivity with respect to organosilicon compounds and resins that are matrix components of the coating films, and thereby allow the films to exhibit excellent performance. Oligomer-modified fine particles include inorganic oxide fine particles having a surface modified with an oligomer, the oligomer being derived from a metal alkoxide represented by Formula (1): RnM1(OR?)z-n (1) wherein M1: one or more elements selected from Si, Ti, Zr and Al; R and R?: one or more groups selected from alkyl groups of 1 to 8 carbon atoms, aryl groups and vinyl groups; n: an integer of from 0 to (z?2); and z: the valence of M1. The oligomer has a polymerization degree of 3 or more. The oligomer has a weight average molecular weight in the range of 1000 to 10000.
    Type: Application
    Filed: December 21, 2012
    Publication date: October 23, 2014
    Applicant: JGC Catalysts and Chemicals Ltd
    Inventors: Yoichi Ishihara, Toshiharu Hirai