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).
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Patent number: 11214681Abstract: 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: GrantFiled: August 29, 2016Date of Patent: January 4, 2022Assignees: MITSUBISHI GAS CHEMICAL COMPANY, INC., MGC FILSHEET CO., LTD.Inventors: Haruhiko Kurokawa, Atsuhiro Tokita, Junya Asano
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Publication number: 20210252765Abstract: 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: ApplicationFiled: April 27, 2021Publication date: August 19, 2021Applicants: MITSUBISHI GAS CHEMICAL COMPANY, INC., MGC FILSHEET CO., LTD.Inventors: Haruhiko KUROKAWA, Hiroki ISHII, Masatoshi NAKASHIMA
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Publication number: 20200262110Abstract: 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: ApplicationFiled: May 4, 2020Publication date: August 20, 2020Applicants: MITSUBISHI GAS CHEMICAL COMPANY, INC., MGC FILSHEET CO., LTD.Inventors: Haruhiko KUROKAWA, Hiroki ISHII, Masatoshi NAKASHIMA
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Patent number: 10696818Abstract: 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: GrantFiled: August 29, 2016Date of Patent: June 30, 2020Assignees: MITSUBISHI GAS CHEMICAL COMPANY, INC., MGC FILSHEET CO., LTD.Inventors: Haruhiko Kurokawa, Atsuhiro Tokita, Hiroki Ishii
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Patent number: 10508191Abstract: 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: GrantFiled: August 29, 2016Date of Patent: December 17, 2019Assignees: MITSUBUSHI GAS CHEMICAL COMPANY, INC., MGC FILSHEET CO., LTD.Inventors: Hiroki Ishii, Haruhiko Kurokawa, Atsuhiro Tokita
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Publication number: 20180215901Abstract: 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: ApplicationFiled: August 29, 2016Publication date: August 2, 2018Applicants: MITSUBISHI GAS CHEMICAL COMPANY, INC., MGC FILSHEET CO., LTD.Inventors: Haruhiko KUROKAWA, Atsuhiro TOKITA, Hiroki ISHII
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Publication number: 20180208763Abstract: 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: ApplicationFiled: August 29, 2016Publication date: July 26, 2018Applicants: MITSUBISHI GAS CHEMICAL COMPANY, INC., MGC FILSHEET CO., LTD.Inventors: Haruhiko KUROKAWA, Atsuhiro TOKITA, Junya ASANO
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Publication number: 20180201754Abstract: 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: ApplicationFiled: August 29, 2016Publication date: July 19, 2018Applicants: MITSUBISHI GAS CHEMICAL COMPANY, INC., MGC FILSHEET CO., LTD.Inventors: Hiroki ISHII, Haruhiko KUROKAWA, Atsuhiro TOKITA
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Publication number: 20180071995Abstract: 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: ApplicationFiled: March 24, 2016Publication date: March 15, 2018Applicants: MITSUBISHI GAS CHEMICAL COMPANY, INC., MGC FILSHEET CO., LTD.Inventor: Haruhiko KUROKAWA
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Publication number: 20180071970Abstract: 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: ApplicationFiled: April 12, 2016Publication date: March 15, 2018Applicants: MITSUBISHI GAS CHEMICAL COMPANY, INC., MGC FILSHEET CO., LTD.Inventors: Hiroki ISHII, Haruhiko KUROKAWA
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Publication number: 20170036376Abstract: 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: ApplicationFiled: April 10, 2015Publication date: February 9, 2017Applicants: MITSUBISHI GAS CHEMICAL COMPANY, INC., MGC FILSHEET CO., LTD.Inventors: Haruhiko KUROKAWA, Hiroki ISHII, Masatoshi NAKASHIMA
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Patent number: 8835534Abstract: 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: GrantFiled: February 23, 2010Date of Patent: September 16, 2014Assignee: Mitsubishi Engineering-Plastics CorporationInventors: Haruhiko Kurokawa, Yasushi Ogawa, Yutaka Shiraishi
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Publication number: 20140155548Abstract: 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: ApplicationFiled: June 25, 2012Publication date: June 5, 2014Applicant: Mitsubishi Engineering-Plastics CorporationInventors: Haruhiko Kurokawa, Yutaka Nishibayashi, Hiromitsu Nagashima
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Publication number: 20110269882Abstract: 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: ApplicationFiled: February 23, 2010Publication date: November 3, 2011Applicant: Mitsubishi Engineering-Plastics CorporationInventors: Haruhiko Kurokawa, Yasushi Ogawa, Yutaka Shiraishi
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Patent number: 7616858Abstract: 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: GrantFiled: February 27, 2006Date of Patent: November 10, 2009Assignees: Mitsubishi Engineering-Plastics Corporation, Mitsubishi Gas Chemical Company, Inc.Inventors: Hisashi Tahara, Haruhiko Kurokawa
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Publication number: 20090162628Abstract: 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: ApplicationFiled: December 27, 2006Publication date: June 25, 2009Inventors: Haruhiko Kurokawa, Kazuhiko Ishii, Hisashi Tahara, Kazuhiro Ando, Hisato Abe, Kazuyuki Takahashi, Ryuuji Uchimura
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Publication number: 20080144324Abstract: 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: ApplicationFiled: February 27, 2006Publication date: June 19, 2008Inventors: Hisashi Tahara, Haruhiko Kurokawa
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Publication number: 20050049368Abstract: 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: ApplicationFiled: August 17, 2004Publication date: March 3, 2005Inventors: Hiroyoshi Maruyama, Haruhiko Kurokawa