Patents by Inventor Takahiko Otsubo

Takahiko Otsubo 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: 20180338927
    Abstract: In a system where phase separation into two phases occurs when an ether cellulose derivative (A), a polymer (B) different from the ether cellulose derivative (A), and an alcohol solvent (C) are mixed together, the two phases including a solution phase mainly containing the ether cellulose derivative (A) and a solution phase mainly containing the polymer (B), the two separated phases containing approximately the same solvent, an emulsion is formed and brought into contact with a poor solvent (D) to provide an ether cellulose derivative microparticle having an average particle diameter of 1 to 1,000 ?m, a linseed oil absorption of 50 to 1,000 mL/100 g, and an average surface pore size of 0.05 to 5 ?m.
    Type: Application
    Filed: October 26, 2016
    Publication date: November 29, 2018
    Inventors: Takahiko Otsubo, Kotoe Ohta, Yuji Echigo, Hiroshi Takezaki, Suguru Takaki, Satoshi Minakami, Akinori Ito, Hisashi Miyama
  • Patent number: 10125252
    Abstract: By first forming an emulsion in a system that separates into two phases which include a solution phase containing an ethylene-vinyl alcohol copolymer (A) as the main component and a solution phase containing a polymer (B) different from the ethylene-vinyl alcohol copolymer (A) as the main component when the copolymer (A), the polymer (B), and an organic solvent (C) having an SP value of 20 (J/cm3)1/2 to 30 (J/cm3)1/2 are dissolved and mixed together, and then causing the ethylene-vinyl alcohol copolymer (A) to precipitate as microparticles by bringing a poor solvent (D) of the ethylene-vinyl alcohol copolymer (A) into contact with the emulsion, it is possible to obtain ethylene-vinyl alcohol copolymer microparticles that have a narrow particle size distribution wherein the particle size distribution index in a dry-powder state is 2 or less, have a true spherical particle shape, and exhibit excellent re-dispersibility into liquid.
    Type: Grant
    Filed: May 21, 2014
    Date of Patent: November 13, 2018
    Assignee: Toray Industries, Inc.
    Inventors: Takahiko Otsubo, Itaru Asano, Hiroshi Takezaki
  • Publication number: 20180105669
    Abstract: Carbon-black-encapsulated polyamide microparticles are obtained by bringing a poor solvent of polyamide into contact with an emulsion to cause carbon-black-encapsulated polyamide to be precipitated, the emulsion being formed in a system that has separated into two solution phases when carbon black is mixed with a polymer solution prepared by dissolving a polyamide, a polymer (B) different from the polyamide, and an organic solvent (C), the polymer (B) being the main component in one of the phases, and, in the other of the phases, the polyamide being the main component and the carbon black being selectively distributed; wherein it is possible to obtain black polyamide microparticles having a number-average particle size of 1-200 ?m and a temperature difference between the melting temperature and the cooling crystallization temperature of 25° C. or more, the microparticles being suitable for use in powder bed fusion additive manufacturing.
    Type: Application
    Filed: December 9, 2015
    Publication date: April 19, 2018
    Inventors: Takahiko Otsubo, Hisashi Miyama, Hiroshi Takezaki
  • Patent number: 9777130
    Abstract: Polyphenylene sulfide microparticles have a linseed oil absorption amount of 40 to 1,000 mL/100 g and a number average particle diameter of 1 to 200 ?m. The porous PPS microparticles have a large specific surface area and therefore promote fusion of particles when molded into various molded bodies by applying thermal energy, thus enabling formation or molding of a coating layer of particles at a lower temperature in a shorter time. The porous PPS microparticles have a porous shape and therefore enable scattering light in multiple directions and suppression of specific reflection of reflected light in a specific direction, thus making it possible to impart shading effect and matte effect when added to a medium.
    Type: Grant
    Filed: December 17, 2014
    Date of Patent: October 3, 2017
    Assignee: Toray Industries, Inc.
    Inventors: Takahiko Otsubo, Itaru Asano, Yoko Wakahara, Hiroshi Takezaki
  • Patent number: 9676937
    Abstract: [Problem] To provide: a fiber-reinforced composite material having both Mode I interlaminar fracture toughness and compressive strength under wet heat conditions; an epoxy resin composition for producing the fiber-reinforced composite material; and a prepreg produced using the epoxy resin composition. [Solution] An epoxy resin composition comprising at least the following constituents [A], [B] and [C]: [A] an epoxy resin; [B] composite polyamide microparticles which satisfy such a requirement (b1) the materials constituting the particles are a polyamide (B1) and a thermoplastic elastomer resin (B2), such a requirement (b2) that the melting point or the glass transition temperature of the polyamide (B1) is higher than 100° C. and such a requirement (b3) the number average particle diameter is 0.1 to 100 ?m; and [C] a curing agent.
    Type: Grant
    Filed: August 1, 2014
    Date of Patent: June 13, 2017
    Assignee: TORAY INDUSTRIES, INC.
    Inventors: Hiroshi Kobayashi, Takahiko Otsubo, Hiroshi Takezaki, Nobuyuki Tomioka
  • Publication number: 20160311995
    Abstract: Polyphenylene sulfide microparticles have a linseed oil absorption amount of 40 to 1,000 mL/100 g and a number average particle diameter of 1 to 200 ?m. The porous PPS microparticles have a large specific surface area and therefore promote fusion of particles when molded into various molded bodies by applying thermal energy, thus enabling formation or molding of a coating layer of particles at a lower temperature in a shorter time. The porous PPS microparticles have a porous shape and therefore enable scattering light in multiple directions and suppression of specific reflection of reflected light in a specific direction, thus making it possible to impart shading effect and matte effect when added to a medium.
    Type: Application
    Filed: December 17, 2014
    Publication date: October 27, 2016
    Inventors: Takahiko Otsubo, Itaru Asano, Yoko Wakahara, Hiroshi Takezaki
  • Patent number: 9416233
    Abstract: Composite polyamide fine particles include a polyamide (A1) which has a melting point or a glass transition temperature of over 100° C. and a polymer (A2) which is different from the polyamide (A1). The composite polyamide fine particles have: a dispersion structure in which a plurality of domains each having an average particle diameter of 0.05 to 100 ?m whose main component is the polymer (A2) are dispersed in a polyamide (A1) based matrix; an average particle diameter of 0.1 to 500 ?m; and a sphericity of 80 or more.
    Type: Grant
    Filed: February 8, 2013
    Date of Patent: August 16, 2016
    Assignee: Toray Industries, Inc.
    Inventors: Hiroshi Kobayashi, Takahiko Otsubo, Hiroshi Takezaki
  • Publication number: 20160122528
    Abstract: [Problem] To provide: a fiber-reinforced composite material having both Mode I interlaminar fracture toughness and compressive strength under wet heat conditions; an epoxy resin composition for producing the fiber-reinforced composite material; and a prepreg produced using the epoxy resin composition. [Solution] An epoxy resin composition comprising at least the following constituents [A], [B] and [C]: [A] an epoxy resin; [B] composite polyamide microparticles which satisfy such a requirement (b1) the materials constituting the particles are a polyamide (B1) and a thermoplastic elastomer resin (B2), such a requirement (b2) that the melting point or the glass transition temperature of the polyamide (B1) is higher than 100° C. and such a requirement (b3) the number average particle diameter is 0.1 to 100 ?m; and [C] a curing agent.
    Type: Application
    Filed: August 1, 2014
    Publication date: May 5, 2016
    Applicant: TORAY INDUSTRIES, INC.
    Inventors: Hiroshi KOBAYASHI, Takahiko OTSUBO, Hiroshi TAKEZAKI, Nobuyuki TOMIOKA
  • Publication number: 20160122523
    Abstract: By first forming an emulsion in a system that separates into two phases which include a solution phase containing an ethylene-vinyl alcohol copolymer (A) as the main component and a solution phase containing a polymer (B) different from the ethylene-vinyl alcohol copolymer (A) as the main component when the copolymer (A), the polymer (B), and an organic solvent (C) having an SP value of 20 (J/cm3)1/2 to 30 (J/cm3)1/2 are dissolved and mixed together, and then causing the ethylene-vinyl alcohol copolymer (A) to precipitate as microparticles by bringing a poor solvent (D) of the ethylene-vinyl alcohol copolymer (A) into contact with the emulsion, it is possible to obtain ethylene-vinyl alcohol copolymer microparticles that have a narrow particle size distribution wherein the particle size distribution index in a dry-powder state is 2 or less, have a true spherical particle shape, and exhibit excellent re-dispersibility into liquid.
    Type: Application
    Filed: May 21, 2014
    Publication date: May 5, 2016
    Applicant: Toray Industries, Inc.
    Inventors: Takahiko Otsubo, Itaru Asano, Hiroshi Takezaki
  • Publication number: 20150031834
    Abstract: Composite polyamide fine particles include a polyamide (A1) which has a melting point or a glass transition temperature of over 100° C. and a polymer (A2) which is different from the polyamide (A1). The composite polyamide fine particles have: a dispersion structure in which a plurality of domains each having an average particle diameter of 0.05 to 100 ?m whose main component is the polymer (A2) are dispersed in a polyamide (A1) based matrix; an average particle diameter of 0.1 to 500 ?m; and a sphericity of 80 or more.
    Type: Application
    Filed: February 8, 2013
    Publication date: January 29, 2015
    Inventors: Hiroshi Kobayashi, Takahiko Otsubo, Hiroshi Takezaki