Patents by Inventor Haruhiko Kurokawa

Haruhiko Kurokawa 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).

  • Patent number: 11214681
    Abstract: The present invention provides a polycarbonate resin composition containing a polycarbonate resin (A), a flame retardant (B), and a fluoropolymer (C), said polycarbonate resin composition being characterized in that the fluidity of the fluoropolymer (C), as measured using a Koka flow tester (under the conditions of a measurement temperature of 400° C., a measurement load of 0.98 MPa, and a die hole diameter of 2.1 mm), is 0.1×10?3 cm3/sec or greater. The present invention also provides a sheet and a film.
    Type: Grant
    Filed: August 29, 2016
    Date of Patent: January 4, 2022
    Assignees: MITSUBISHI GAS CHEMICAL COMPANY, INC., MGC FILSHEET CO., LTD.
    Inventors: Haruhiko Kurokawa, Atsuhiro Tokita, Junya Asano
  • Publication number: 20210252765
    Abstract: Provided is an aromatic polycarbonate resin sheet/film which has excellent bending characteristics and surface smoothness. It is found that a sheet having excellent surface smoothness, which cannot be achieved by conventional sheets, can be obtained by adjusting sheet extrusion conditions for a polycarbonate resin sheet/film into which a reinforcing filler is blended. It is also found that a thermally shaped article having excellent appearance can be obtained by using this sheet in pressure molding or in thermal press molding.
    Type: Application
    Filed: April 27, 2021
    Publication date: August 19, 2021
    Applicants: MITSUBISHI GAS CHEMICAL COMPANY, INC., MGC FILSHEET CO., LTD.
    Inventors: Haruhiko KUROKAWA, Hiroki ISHII, Masatoshi NAKASHIMA
  • Publication number: 20200262110
    Abstract: Provided is an aromatic polycarbonate resin sheet/film which has excellent bending characteristics and surface smoothness. It is found that a sheet having excellent surface smoothness, which cannot be achieved by conventional sheets, can be obtained by adjusting sheet extrusion conditions for a polycarbonate resin sheet/film into which a reinforcing filler is blended. It is also found that a thermally shaped article having excellent appearance can be obtained by using this sheet in pressure molding or in thermal press molding.
    Type: Application
    Filed: May 4, 2020
    Publication date: August 20, 2020
    Applicants: MITSUBISHI GAS CHEMICAL COMPANY, INC., MGC FILSHEET CO., LTD.
    Inventors: Haruhiko KUROKAWA, Hiroki ISHII, Masatoshi NAKASHIMA
  • Patent number: 10696818
    Abstract: The present invention provides a polycarbonate resin composition characterized by containing 73 to 94.5 mass % of a polycarbonate resin (A), 5 to 25 mass % of a phosphorus-based flame retardant (B), and 0.1 to 2 mass % of a fluoropolymer (C), and by having a flow value of 1×0.01 to 10×0.01 cm3/sec at 280° C. The present invention also provides a sheet and a film using the polycarbonate resin composition.
    Type: Grant
    Filed: August 29, 2016
    Date of Patent: June 30, 2020
    Assignees: MITSUBISHI GAS CHEMICAL COMPANY, INC., MGC FILSHEET CO., LTD.
    Inventors: Haruhiko Kurokawa, Atsuhiro Tokita, Hiroki Ishii
  • Patent number: 10508191
    Abstract: The present invention provides: a polycarbonate resin composition which contains 18-75% by mass of (A) a polycarbonate resin having a viscosity average molecular weight of 28,000-60,000, 5-30% by mass of (B) a phosphorus flame retardant, 18-50% by mass of (C) a fibrous or plate-like inorganic filler, and 0.1-2% by mass of (D) a fluoropolymer; and a sheet and a film, each of which uses this polycarbonate resin composition.
    Type: Grant
    Filed: August 29, 2016
    Date of Patent: December 17, 2019
    Assignees: MITSUBUSHI GAS CHEMICAL COMPANY, INC., MGC FILSHEET CO., LTD.
    Inventors: Hiroki Ishii, Haruhiko Kurokawa, Atsuhiro Tokita
  • Publication number: 20180215901
    Abstract: The present invention provides a polycarbonate resin composition characterized by containing 73 to 94.5 mass % of a polycarbonate resin (A), 5 to 25 mass % of a phosphorus-based flame retardant (B), and 0.1 to 2 mass % of a fluoropolymer (C), and by having a flow value of 1×0.01 to 10×0.01 cm3/sec at 280° C. The present invention also provides a sheet and a film using the polycarbonate resin composition.
    Type: Application
    Filed: August 29, 2016
    Publication date: August 2, 2018
    Applicants: MITSUBISHI GAS CHEMICAL COMPANY, INC., MGC FILSHEET CO., LTD.
    Inventors: Haruhiko KUROKAWA, Atsuhiro TOKITA, Hiroki ISHII
  • Publication number: 20180208763
    Abstract: The present invention provides a polycarbonate resin composition containing a polycarbonate resin (A), a flame retardant (B), and a fluoropolymer (C), said polycarbonate resin composition being characterized in that the fluidity of the fluoropolymer (C), as measured using a Koka flow tester (under the conditions of a measurement temperature of 400° C., a measurement load of 0.98 MPa, and a die hole diameter of 2.1 mm), is 0.1×10?3 cm3/sec or greater. The present invention also provides a sheet and a film.
    Type: Application
    Filed: August 29, 2016
    Publication date: July 26, 2018
    Applicants: MITSUBISHI GAS CHEMICAL COMPANY, INC., MGC FILSHEET CO., LTD.
    Inventors: Haruhiko KUROKAWA, Atsuhiro TOKITA, Junya ASANO
  • Publication number: 20180201754
    Abstract: The present invention provides: a polycarbonate resin composition which contains 18-75% by mass of (A) a polycarbonate resin having a viscosity average molecular weight of 28,000-60,000, 5-30% by mass of (B) a phosphorus flame retardant, 18-50% by mass of (C) a fibrous or plate-like inorganic filler, and 0.1-2% by mass of (D) a fluoropolymer; and a sheet and a film, each of which uses this polycarbonate resin composition.
    Type: Application
    Filed: August 29, 2016
    Publication date: July 19, 2018
    Applicants: MITSUBISHI GAS CHEMICAL COMPANY, INC., MGC FILSHEET CO., LTD.
    Inventors: Hiroki ISHII, Haruhiko KUROKAWA, Atsuhiro TOKITA
  • Publication number: 20180071995
    Abstract: Provided is a thermoplastic resin film laminate, which is obtained by ultrasonic welding of a thermoplastic resin film and a thermoplastic resin molded article, and which has high welding strength and excellent appearance with less welding marks. The above-described problem is solved by a thermoplastic resin film laminate which is obtained by bonding, by ultrasonic welding, a thermoplastic resin film having a thickness of 0.4 mm or less and a welding margin of a thermoplastic resin molded article having the welding margin and having a thickness of 0.5 mm or more, and wherein the height of the welding margin is 75-125% of the thickness of the thermoplastic resin film.
    Type: Application
    Filed: March 24, 2016
    Publication date: March 15, 2018
    Applicants: MITSUBISHI GAS CHEMICAL COMPANY, INC., MGC FILSHEET CO., LTD.
    Inventor: Haruhiko KUROKAWA
  • Publication number: 20180071970
    Abstract: A method for producing a hot-press-molded article having an exceptional appearance, while preventing the generation of holes or cracks, by hot-press molding a sheet and film of a thermoplastic resin that contains an inorganic filler. The method includes press molding a resin sheet or resin film that contains a thermoplastic resin and fibrous inorganic filler between an upper mold and a lower mold, wherein the resin sheet contains 40-80 parts by mass of the thermoplastic resin and 20-60 parts by mass of the fibrous inorganic filler in 100 parts by mass of the resin sheet, the thickness of the resin sheet is 0.3-1.2 mm, the average fiber length of the fibrous inorganic filler in the molded article is 50-500 ?m, and the length of the surplus portion of the resin sheet arranged on the concave part of the mold used in press molding is 5-50 mm.
    Type: Application
    Filed: April 12, 2016
    Publication date: March 15, 2018
    Applicants: MITSUBISHI GAS CHEMICAL COMPANY, INC., MGC FILSHEET CO., LTD.
    Inventors: Hiroki ISHII, Haruhiko KUROKAWA
  • Publication number: 20170036376
    Abstract: Provided is an aromatic polycarbonate resin sheet/film which has excellent bending characteristics and surface smoothness. It is found that a sheet having excellent surface smoothness, which cannot be achieved by conventional sheets, can be obtained by adjusting sheet extrusion conditions for a polycarbonate resin sheet/film into which a reinforcing filler is blended. It is also found that a thermally shaped article having excellent appearance can be obtained by using this sheet in pressure molding or in thermal press molding.
    Type: Application
    Filed: April 10, 2015
    Publication date: February 9, 2017
    Applicants: MITSUBISHI GAS CHEMICAL COMPANY, INC., MGC FILSHEET CO., LTD.
    Inventors: Haruhiko KUROKAWA, Hiroki ISHII, Masatoshi NAKASHIMA
  • Patent number: 8835534
    Abstract: An aromatic polycarbonate resin composition superior in thermal stability, flame retardancy, and light reflectivity, and a light reflective member consisting of a molded article of the resin. An aromatic polycarbonate resin composition comprising, 3 to 30 parts by weight of a titanium oxide-based additive (B) which has been surface-treated with alumina and organosiloxane, 0.01 to 1 parts by weight of a metal salt of aromatic sulfonic acid (C), and 0.05 to 0.9 parts by weight of polytetrafluoroethylene (D) based on 100 parts by weight of an aromatic polycarbonate resin (A), characterized in that an aluminum content a (wt %), a carbon content c (wt %) in the titanium oxide-based additive (B), and an average particle size d (?m) of titanium oxide satisfy the following (1) and (2): 6.5?(a/d2)?15??(1) 5?(c/d2)?25??(2).
    Type: Grant
    Filed: February 23, 2010
    Date of Patent: September 16, 2014
    Assignee: Mitsubishi Engineering-Plastics Corporation
    Inventors: Haruhiko Kurokawa, Yasushi Ogawa, Yutaka Shiraishi
  • Publication number: 20140155548
    Abstract: To provide an aromatic polycarbonate resin composition which has an impact resistance improved by blending of an impact strength improver and which also has an excellent transparency and a good surface hardness. The aromatic polycarbonate resin composition includes, with respect to 100 parts by mass of a resin component containing 55 to 85 percent by mass of an aromatic polycarbonate resin (A) having a mass average molecular weight of 15,000 to 40,000 and 15 to 45 percent by mass of a (meth)acrylate copolymer (B) which has a mass average molecular weight of 5,000 to 30,000 and which is composed of an aromatic (meth)acrylate unit (b1) and a methyl (meth)acrylate unit (b2) at a mass ratio (b1/b2) of 5 to 50/50 to 95, 1 to 20 parts by mass of an impact strength improver (C). A refractive index nab of the resin component at a wavelength of 589 nm and a refractive index nc of the impact strength improver (C) at a wavelength of 589 nm satisfy the following formula i). ?0.01?nab?nc?+0.
    Type: Application
    Filed: June 25, 2012
    Publication date: June 5, 2014
    Applicant: Mitsubishi Engineering-Plastics Corporation
    Inventors: Haruhiko Kurokawa, Yutaka Nishibayashi, Hiromitsu Nagashima
  • Publication number: 20110269882
    Abstract: An aromatic polycarbonate resin composition superior in thermal stability, flame retardancy, and light reflectivity, and a light reflective member consisting of a molded article of the resin. An aromatic polycarbonate resin composition comprising, 3 to 30 parts by weight of a titanium oxide-based additive (B) which has been surface-treated with alumina and organosiloxane, 0.01 to 1 parts by weight of a metal salt of aromatic sulfonic acid (C), and 0.05 to 0.9 parts by weight of polytetrafluoroethylene (D) based on 100 parts by weight of an aromatic polycarbonate resin (A), characterized in that an aluminium content a (wt %), a carbon content c (wt %) in the titanium oxide-based additive (B), and an average particle size d (?m) of titanium oxide satisfy the following (1) and (2): 6.
    Type: Application
    Filed: February 23, 2010
    Publication date: November 3, 2011
    Applicant: Mitsubishi Engineering-Plastics Corporation
    Inventors: Haruhiko Kurokawa, Yasushi Ogawa, Yutaka Shiraishi
  • Patent number: 7616858
    Abstract: A light guiding plate is made of a transparent thermoplastic resin and has a first main surface, a second main surface opposed to said first main surface, a first side wall, a second side wall, a third side wall opposed to said first side wall and a fourth side wall opposed to said second side wall. The surface portion of the first main surface is provided with convex portions and/or concave portions, and the light guiding plate has a longitudinal-direction length, which is a length from the first side wall to the third side wall, of 40 mm or more but 130 mm or less, at least 80% region of the light guiding plate has a thickness of 0.1 mm or more but 0.55 mm or less.
    Type: Grant
    Filed: February 27, 2006
    Date of Patent: November 10, 2009
    Assignees: Mitsubishi Engineering-Plastics Corporation, Mitsubishi Gas Chemical Company, Inc.
    Inventors: Hisashi Tahara, Haruhiko Kurokawa
  • Publication number: 20090162628
    Abstract: There is provided an aromatic polycarbonate resin composition exhibiting excellent mechanical strength, transfer property, light transmittance, thermal stability and moldability which is capable of being molded into thin-wall products and large-size products, as well as a light guide plate produced from the resin composition. The present invention relates to an aromatic polycarbonate resin composition for light guide plates, comprising an aromatic polycarbonate resin having a viscosity-average molecular weight of 13,000 to 15,000, and a ratio of a weight-average molecular weight to a number-average molecular weight (Mw/Mn) of 1.5 to 2.7 in terms of polystyrene as measured by gel permeation chromatography; and a stabilizer and a releasing agent blended in the aromatic polycarbonate resin, as well as a light guide plate produced from the resin composition.
    Type: Application
    Filed: December 27, 2006
    Publication date: June 25, 2009
    Inventors: Haruhiko Kurokawa, Kazuhiko Ishii, Hisashi Tahara, Kazuhiro Ando, Hisato Abe, Kazuyuki Takahashi, Ryuuji Uchimura
  • Publication number: 20080144324
    Abstract: A light guiding plate is made of a transparent thermoplastic resin and has a first main surface, a second main surface opposed to said first main surface, a first side wall, a second side wall, a third side wall opposed to said first side wall and a fourth side wall opposed to said second side wall, the surface portion of the first main surface is provided with convex portions and/or concave portions, the light guiding plate has a longitudinal-direction length, which is a length from the first side wall to the third side wall, of 40 mm or more but 130 mm or less, at least 80% region of the light guiding plate has a thickness of 0.1 mm or more but 0.55 mm or less.
    Type: Application
    Filed: February 27, 2006
    Publication date: June 19, 2008
    Inventors: Hisashi Tahara, Haruhiko Kurokawa
  • Publication number: 20050049368
    Abstract: The present invention relates to aromatic polycarbonate resin pellets for light guide plate, which pellets contain dusts having a particle size of 0.5 to 1.0 ?m in an amount of not more than 50,000 particles/g, and dusts having a particle size of more than 1.0 ?m in an amount of not more than 3,000 particles/g, and a light guide plate comprising the aromatic polycarbonate resin pellets which contains dusts having a particle size of 0.5 to 1.0 ?m in an amount of not more than 50,000 particles/g, and dusts having a particle size of more than 1.0 ?m in an amount of not more than 3,000 particles/g.
    Type: Application
    Filed: August 17, 2004
    Publication date: March 3, 2005
    Inventors: Hiroyoshi Maruyama, Haruhiko Kurokawa